What is the function of the cell membrane? (4 points) To add structure and support to the shape of the cell To control what substances enter and leave the cell To monitor the amount of glucose needed by the cell To prevent waste from entering and leaving the cell

Answer:

H2S.

Explanation:

That would be H2S,  hydrogen sulphide. (Smells like bad eggs!).

Answer:

Explanation:

The mole fraction of a component is the ratio of the number of moles of the component to the total number of moles of the solution.

Now, the number of moles of each component is determined from its molar mass as:

Thus, you can write:

        Molar mass CH₄O = 32.04 g/mol

        Number of moles CH₄O = mass CH₄O / 32.04 g/mol

        Molar mass C₂H₆O = 46.07 g/mol

        Number moles C₂H₆O = mass of C₂H₆O / 46.07 g/mol

Since both masses are equal, call them m.

Mole fraction of CH₄O =  [ m / 32.04 ] / [ m / 32.04 + m / 46.07]

         [ 1 / 32.04] / [1 / 32.04 + 1 /46.07] = 0.5898

Since, the sum of the mole fractions of all the components is 1 and  there are only two components:

Mole fraction of C₂H₆O = 1 - 0.5898 = 0.4102

Those numbers are rounded to four significant figures.

You can conclude that a wetland you encounter is a swamp if it contains a variety of trees and shrubs since this characteristic is specific to swamps among different types of wetlands.

When you encounter a wetland and conclude that it's a swamp, the feature that would help you reach this conclusion is the presence of a variety of trees and shrubs. Swamps are characterized by having woody plants such as trees and shrubs, and water flow in swamps is generally slow. The presence of carnivorous plants by itself does not distinguish swamps from other wetlands like bogs and peat marshes, which also contain such plants. Location near a lake or coast does not necessarily identify a wetland as a swamp specifically

Answer:

bromine (Br) and mercury (Hg

Explanation:

Although, elements caesium (Cs), rubidium (Rb), Francium (Fr) and Gallium (Ga) become liquid at or just above room temperature. Mercury doesn't conduct heat or electricity as well as other members of its group. Most metals are solids at room temperature because they share their valence electrons with surrounding metal atoms. However Mercury hangs onto its 6 valence electrons tighter than any other atom.

Answer:

Explanation:

Taking 25°C as the room temperature, there are only two elements that are remarkably  liquid at room temperature; they are bromine, Br, (a nonmetal) and mercury, Hg,  (a metal).

It is very surprisingly: the other 116 elements are either solid or gaseous at room temperature.

Nevertheless, a few degrees above 25° other elements will be liquid.

This is the case of:

This information, of course, is found in tables which are available in internet and some textbooks.

Answer:

[tex]\boxed{\text{O}_{2}^{+}}[/tex]

Explanation:

We must fill in the MO diagrams and calculate the bond orders for each species.  

1. O₂⁺

An O atom has six valence electrons, so two O atoms have 12 valence electrons.

O₂⁺ has lost an electron. In Figure 1, we give one O atom six electrons and the other atom five.

Then we add 11 electrons to the molecular orbitals, using the same rules as for atomic orbitals.

Bond order = (Bonding electrons – antibonding electrons)/2

BO = ½(B – A)

B = ½ (8 – 3) = 2.5

2. O₂

O₂ has 12 valence electrons, so we put 12 electrons in Figure 2 and calculate the bonding order.

B = ½ (8 - 4) = 2

3. O₂⁻

O₂⁻ has 13 valence electrons, so we put 13 electrons in Figure 3 and calculate the bonding order.

B = ½ (8 – 5) = 1.5

The species with the highest bond order has the strongest bonds.

O₂⁺ has the highest bond order, so [tex]\boxed{\text{O}_{2}^{+}}[/tex] has the strongest bonds.

According to Molecular Orbital Theory, the species O2+ has the strongest bond. The bond order calculation reveals that O2+ has a bond order of 2.5, compared to O2 with a bond order of 2, and O2-, which has a bond order of 1.5.

To determine which species (O2-, O2 or O2+) has the strongest bond according to Molecular Orbital Theory, we need to consider the bond order, which is an indicator of bond strength. The bond order is determined by subtracting the number of electrons in antibonding orbitals from the number of electrons in bonding orbitals, and halving the result.

The diatomic oxygen molecule, O2, has a bond order of 2. For O2+, one electron is removed, creating a bond order of 2.5. For O2-, an electron is added, which must enter an antibonding orbital, resulting in a bond order of 1.5.

Therefore, according to Molecular Orbital Theory, O2+ (with a bond order of 2.5) has the strongest bond.

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It seems like the answer is C, you really just need to use the process of elimination.

Suspect A's ability to recount events in reverse order demonstrates reliance on the power of their memory. However, eyewitness confidence does not necessarily equate to memory accuracy due to potential suggestibility and memory distortion.

When Suspect A retells the events of a certain evening in the reverse order after confidently describing them one way, they are relying primarily on the power of their memory. This ability demonstrates that they have a concrete and detailed recollection of the events. Contrary to being an attempt to confuse the interrogator or a function of inexperience or a demonstration of lying ability, being able to retell events in reverse order suggests a strong and accurate memory. It is important to note, however, that eyewitnesses may be very confident in their recollections even when their memories are incorrect, which is a natural flaw in human cognition known as memory distortion. Furthermore, eyewitnesses can have their memories influenced by external factors, such as the suggestibility that can occur during police questioning.

Answer:

The correct option is C.

Explanation:

Nuclear and chemical reactions are two types of reactions that one usually encounter in chemistry. These two reactions differ from each other significantly. For instance, the nuclear reactions usually involve the nucleus of the involving atoms while chemical reactions has to do with the electrons that are located outside of the nucleus of the atoms. Also, it is only chemical reaction that are influenced by factors such as temperature, pressure, catalyst, etc. Such factors does not determine the rate of nuclear reactions.

Atoms are not involved in nuclear reactions, temperature affects chemical reactions, nuclear reactions are not predictable

One way that nuclear reactions differ from chemical reactions is that atoms are not involved in nuclear reactions. In nuclear reactions, the nucleus of an atom undergoes changes, while in chemical reactions, it is the arrangement of atoms and the bonding between them that changes.

On the other hand, chemical reactions are affected by temperature and can be sped up or slowed down by changes in temperature. In contrast, nuclear reactions are not significantly influenced by temperature.

Nuclear reactions are not predictable in the same sense as chemical reactions. The rate and outcome of nuclear reactions cannot be determined solely by the initial conditions and the stoichiometry of the reactants, as is the case in chemical reactions.

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Answer:

Equilibrium shifts to produce more reactant

Explanation:

This will increase the concentration of the products side, so the reaction will be shifted to the lift side (reactants side) to suppress the increase in the concentration of Products.

So, the right choice is: Equilibrium shifts to produce more reactant

According to the Le-chatelier principle,

the equilibrium constant of an system is affected by following three factors:

1.Concentration of reacting substance

2.Temperature to carryout the reaction

3.Pressure provided during the reaction

Answer:

Structural formulas

Explanation:

I know cause i just did it

The isomers butane and methyl propane differ in their structural formulas. Hence, option 2 is correct.

Structural formulas identify the location of chemical bonds between the atoms of a molecule.

Isomers are compounds with different physical and chemical properties but the same molecular formula.

In organic chemistry, there are many cases of isomerism.

For example, the formula [tex]C_4H_10[/tex] represents both butane and methylpropane.

Hence, option 2 is correct.

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Answer:

About 280 km

Explanation:

1. Find the footprint area of a marble

A marble will fit into a square 1.6 cm on each side.

A = l² = (1.6 cm)² = 2.56 cm²

2. Convert the area of the continental U.S. into square centimetres

(a) Convert to square metres

[tex]A = 8.08 \times 10^{6} \text{ km}^{2}\times \left(\dfrac{\text{1000 m}}{ \text{1 km}}\right) ^{2} = 8.08 \times 10^{12}\text{ m}^{2}[/tex]

(b) Convert to square centimetres

[tex]A = 8.08 \times 10^{12} \text{ m}^{2}\times \left(\dfrac{\text{100 cm}}{ \text{1 m}}\right) ^{2} = 8.08 \times 10^{16}\text{ cm}^{2}[/tex]

3. Calculate the number of marbles to make one layer.

[tex]\text{No. of marbles} = 8.08 \times 10^{16} \text{ cm}^{2}\times \left(\dfrac{ \text{1 marble }}{ \text{2.56 cm}^{2}}\right) = 3.12 \times 10^{16}\text{ marbles}[/tex]

4. Calculate the number of layers needed for Avogadro's number of marbles

Assume the marbles will stack on top of each other like sugar cubes.

[tex]\text{No. of layers}\\= 6.022 \times 10^{23} \text{ marbles} \times \left(\dfrac{ \text{1 layer}}{3.16 \times 10^{16}\text{ marbles}}\right) =1.91\times 10^{7} \text{ layers}[/tex]

5. Calculate the height of the layers

[tex]h = 1.91 \times 10^{7} \text{ layers} \times \dfrac{\text{1.6 cm}}{\text{1 layer}} \times \dfrac{\text{1 cm}}{\text{100 m}} \times \dfrac{\text{1 km}}{\text{1000 m}} = \text{305 km}[/tex]

However, the marbles aren't cubes; they are spheres. Each layer of marbles will slide into the "dimples" of the layer below, like packing oranges into a crate.

The effective height of each layer decreases by about 10 %.

The height of the stack will be about 280 km. That's approximately the straight-line distance from Boston to New York.

A mole of marbles, assuming each marble has a volume of 0.5 cm³, would cover the continental United States to a depth of approximately 37.5 kilometers.

This question is a great example of understanding the concept of moles and units of length in chemistry. A mole, in chemistry, refers to Avogadro's number (6.022 x 10^23) of things, regardless of what the 'things' are. In this case, they're marbles.

If we assume the average marble has a volume of 0.5 cm³ (marbles vary, this is just an estimate), then a mole of marbles would have a volume of: 0.5 cm³/marble x (6.022 x 10^23 marbles/mole) = 3.011 x 10^23 cm³.

To convert this to a more reasonable volume unit, we can use the conversion factor for cm³ to km³, which is 1 km³ = 1 x 10^15 cm³. This gives us approximately 3 x 10^8 km³.

The continental United States has an area of approximately 8 x 10^6 km². To figure out the depth to which a mole of marbles would cover we simply divide the volume by the area 3 x 10^8 km³ ÷ 8 x 10^6 km² = 37.5 km deep.

The mole of marbles would cover the continental United States to a depth of approximately 37.5 kilometers.

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Answer: C. During all hours of operation

Explanation:

The food establishments are the places such as restaurants, cafeterias, food stands and lunchrooms. The person in-charge of the food establishment should remain available at the establishments at all hours of operations. This is because the food establishment person in-charge usually has to look upon operations such as arrangement of the food raw materials, arrangement of kitchen, cooking food and serving it to clients. Such a person will also take into charge of making the bill and collecting the money.

A Person in Charge must be present in a food establishment during all hours of operation to monitor and maintain health and safety standards consistently throughout the day. They handle conflict resolution and enforce correct food handling and cleanliness practices.

In regards to food safety and health regulations, a Person in Charge is required to be present in food establishments during all hours of operation (Option C). This is to ensure that health and safety standards are maintained consistently throughout the day, regardless of potential fluctuations in customer traffic or staff shifts.

Having a Person in Charge present at all times is vital for both conflict resolution and to assure that all food handling practices and general cleanliness standards are being met, therefore ensuring public safety. It also allows for immediate response to any potential foodborne illness situations.

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Answer: A. is your correct option

Explanation: meow meow meow meow meow

Between points 3 and 4, energy is being used to heat water.

Melting and boiling are the physical phenomenon in which state of the matter changes.

Hence, energy is used to heat water.

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Answer: Option D it separates the hydrogen ion (H+) from the chlorine ion (Cl-)​

Answer: The role of water in the given reaction is that it separates the hydrogen ion [tex](H^+)[/tex] from the chlorine ion [tex](Cl^-)​[/tex]

Explanation:

Ionization reaction is defined as the reaction in which an ionic compound dissociates into its ions when dissolved in aqueous solution.

HCl is an ionic compound made by the combination of hydrogen and chlorine atoms.

When HCl is dissolved in water, it leads to the ionization of the compound and separates the ions.

The chemical equation for the ionization of HCl follows:

[tex]HCl(aq.)\rightarrow H^+(aq.)+Cl^-(aq.)[/tex]

Here, aqueous solution represents the compound is dissolved in water.

Hence, the role of water in the given reaction is that it separates the hydrogen ion [tex](H^+)[/tex] from the chlorine ion [tex](Cl^-)​[/tex]

Answer:

Explanation:

Chemical compounds are pure substances constituted by two or more different elements. They have fixed composition and have their unique chemical properties, different from their individual components (elements) and from other compounds.

Thus chemical compounds can be broken down by a chemical change into their individual atoms or other simpler compounds.

The substances indicated by the choices A) methane, B) propanal, and D) water, are chemical compounds with chemical formulae CH₄, C₃H₆O, and H₂O, respectively, so they can be broken down into their consitutents by a chemical change.

On the other hand, tungsten is one of the 118 known elements. Its atomic number is 74, and its chemical symbol is W.

Then, being tungsten an element, which means that all the atoms present in a pure sample have the same number of protons and electrons, it cannot be broken down by a chemical change. The only way to split an atom of tungsten is by a nuclear reaction.

Answer:

[tex]\huge \boxed{\mathrm{C) \ Tungsten}}[/tex]

Explanation:

Tungsten cannot be broken by any physical or chemical methods, because it is an element. It has properties of an element not a compound nor mixture.

Tungsten is an element in the periodic table with an atomic number of 74, symbol W, and atomic mass of 183.84 u.

Tungsten is also a rare metal and is the strongest known metal on Earth. Tungsten can be used to make bullets and missiles.

Answer:

Inert gases

Explanation:

Inert elements have a stable electron configuration meaning their shells/orbitals are full with their requisite number of electrons. Therefore, gaining or losing an electron would take high ionization energy. Therefore they are less likely to be involved in chemical reaction unless a high amount of energy is used. An example of an inert gas is Helium.

'Heavy' hydrogen (the isotope deuterium) , 2/1H is involved ,

[2= mass number, 1= atomic (proton) number]

2/1H + 2/1H → 3/2He + 1/0n

Answer:

All samples of a given chemical compound will be composed of the same elements in the same proportion.

Explanation:

The law of constant composition or definite proportions states that "all pure samples of the same chemical compound contain the same proportions of the elements by mass". For example, every time water H₂O forms, it would always  have the same proportion of hydrogen and oxygen.

The law of constant composition states that all samples of a given chemical compound will have the same elements in the same proportion by mass. This law helps in understanding chemical reactions and stoichiometry.

The law of constant composition (also known as the law of definite proportions) states that all samples of a given chemical compound will be composed of the same elements in the same proportion by mass. This means that regardless of the size or source of the compound, the ratio of the elements in the compound will always be the same.

For example, if we take water (H2O) as a compound, it will always have two hydrogen atoms for every oxygen atom. This ratio of 2:1 is the same for any sample of water. This law highlights the fundamental principle that the composition of a compound is fixed and predictable, and it forms the basis for understanding chemical reactions and stoichiometry.

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4.73 mol (OPTION C)

In order to find the moles of Li produced by the reaction, we have to work from the known information (moles of barium), make a connection between the two species (mole ratio between barium and lithium), then we can calculate determine the moles of Lithium.

Balanced Equation:  2LiBr  +  Ba   →   BaBr₂  +  2Li

                       moles = mass ÷ molar mass

Since the mass of barium is 325 g and its molar mass is 137 g/mol,

then the moles of barium = 325 g ÷ 137 g/mol

                                          = 2.37 mol

Now to find the number of moles of Lithium,  compare the mole ratio of Barium to Lithium based on the stoichiometric values of the balance equation:

      mole ratio of Ba : Li is 1 : 2

    ∴ for every moles of barium in the reaction, there are two moles of Lithium produced

⇒ if moles of Ba = 2.37 moles

then moles of Li = 2.37 moles × 2 moles

                           =  4.74 moles (OPTION C)                                  

4.73 mol of lithium (Li) are produced

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Answer:

D

Explanation:

There are four types of protein structures:

1. Primary Structure - linear order of amino acids in a polypeptide

2. Secondary Structure - folding of the amino acids into a repeated pattern due to hydrogen bonding of the polypeptide backbone

3. Tertiary Structure - the three dimensional structure created by a single polypeptide

4. Quaternary Structure - the arrangement of a number of polypeptide (two or more) folded into a larger complex.

The figure shows the Quaternary structure found in proteins, as is evident from the two different polypeptide chains (identified as light grey and a darker grey) that fold into a complex. This structure is often held together by van der waals forces, ionic bonds, hydrogen bonds, and in some cases, covalent bonds.

Answer:

Here's what I find.

Explanation:

Iodine-131

Iodine-131 is both a beta emitter and a gamma emitter.

[tex]_{53}^{131}\text{I}\longrightarrow \, _{54}^{131}\text{Xe} +\, _{-1}^{0}\text{e} +\, _{0}^{0}\gamma[/tex]

About 90 % of the energy is β-radiation and 10 % is γ-radiation. Both forms are highly energetic.

The main danger is from ingestion. The iodine concentrates in thyroid gland, where the β-radiation destroys cells up to 2 mm from the tissues that absorbed it.

Both the β- and γ-radiation cause cell mutations that can later become cancerous. Small doses, such as those absorbed from the nuclear disasters in the Ukraine and Japan, can cause cancers years after the original iodine has disappeared.

Plutonium-239

Plutonium-239 is an alpha emitter.

[tex]_{94}^{239}\text{U} \longrightarrow \, _{92}^{235}\text{Xe} + \, _{2}^{4}\text{He}[/tex]

Alpha particles cannot penetrate the skin, so external exposure isn't much of a health risk.

However, they are extremely dangerous when they are inhaled and get inside cells. They travel first to the blood or lymph system and later to the bone marrow and liver, where they cause up to 1000 times more chromosomal damage than beta or gamma rays.

It takes about 20 years for plutonium to be eliminated from the liver around 50 years for from the skeleton, so it has a long time to cause damage.

Answer:

Explanation:

1) Find the z-scores:

a) z-score for 22.6 inches length

b) z-score for 17.4 inches length

2) Probability

Then, you have to find the probability that the length of an infant is between - 1.00 and 1.00 standards deviations (σ) from the mean (μ).

That is a well known value of 68%, which is part of the 68-95-99.7 empirical rule.

The most exact result is obtained from tables and is 68.26%:

The question wanted you to round the answer to the nearest whole number so the correct answer for acellus is 68%

The pOH of the solution was used to calculate the pH. Using the pH, the hydrogen ion concentration was calculated to be approximately 3.16 × 10^-10 M.

The question is asking about calculating the hydrogen ion concentration of a solution, given the pOH and the ion product constant for water, Kw. To solve this, we have to use the relationship between pOH, pH, and Kw; where at 25°C, the sum of pH and pOH is equal to 14. Since we know the pOH, we can calculate pH first. The pH value would be 14 - 4.50 = 9.50.

To find the hydrogen ion concentration ([H3O+]), we can use the formula [H3O+] = 10^-pH. Therefore [H3O+] = 10^-9.50 ≈ 3.16 × 10^-10 M. Hence, the hydrogen ion concentration of this solution is 3.16 × 10^-10 M.

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Answer:

The reaction requires 0.795 grams of HCl. True.

This reaction also produces 1.04 grams of MgCl₂. True.

The number of moles of the reactants consumed will equal the number of moles of the products made. False.

Explanation:

2HCl(aq) + Mg(s) → MgCl₂(aq) + H₂(g),

It is clear that 2 mol of HCl react with 1 mol of Mg to produce 1 mol of MgCl₂ and 2 mol of H₂.

The reaction requires 0.795 grams of HCl.

no. of moles of H₂ = mass/molar mass = (0.022 g)/(2.015 g/mol) = 0.01092 mol.

using cross multiplication:

2 mol of HCl produce → 1 mol of H₂, from stichiometry.

??? mol of HCl produce → 0.01092 mol of H₂.

∴ The no. of moles of HCl needed to produce (0.01092 mol) of H₂ = (2 mol)(0.01092 mol)/(1 mol) = 0.02184 mol.

∴ The mass of HCl needed = no. of moles * molar mass = (0.02184 mol)*(36.46 g/mol) = 0.796 g.

So, this statement is true.

This reaction also produces 1.04 grams of MgCl₂.

using cross multiplication:

1 mol of MgCl₂ produced with → 1 mol of H₂, from stichiometry.

0.01092 mol of MgCl₂ produce with → 0.01092 mol of H₂.

∴ The mass of MgCl₂ produced = no. of moles * molar mass = (0.01092 mol)*(95.211 g/mol) = 1.04 g.

So, this statement is true.

The number of moles of the reactants consumed will equal the number of moles of the products made.

From the stichiometry 3 moles of reactants (2 mol of HCl, 1 mol of Mg) are reacted to produce 2 moles of products (1 mol of MgCl₂, 1 mol of H₂).

So, the statement is false.

Out of the given statements, True are:

The reaction requires 0.795 grams of HCl.

This reaction also produces 1.04 grams of MgCl₂.

Out of the given statements, False are:

The number of moles of the reactants consumed will equal the number of moles of the products made.

2HCl(aq) + Mg(s) → MgCl₂(aq) + H₂(g),

When 2 mol of HCl react with 1 mol of Mg to produce 1 mol of MgCl₂ and 2 mol of H₂.

The reaction requires 0.795 grams of HCl.

Calculation for number of moles:

No. of moles of H₂ = mass/molar mass = (0.022 g)/(2.015 g/mol) = 0.01092 mol.

To find:

The required mass of HCl to produce 0.022 g of H₂ (0.01092 mol):

2 mol of HCl produce → 1 mol of H₂, from stoichiometry.

??? mol of HCl produce → 0.01092 mol of H₂.

Thus, the no. of moles of HCl needed to produce (0.01092 mol) of H₂ = (2 mol)(0.01092 mol)/(1 mol) = 0.02184 mol.

And , the mass of HCl needed = no. of moles * molar mass = (0.02184 mol)*(36.46 g/mol) = 0.796 g.

So, this statement is true.

This reaction also produces 1.04 grams of MgCl₂.

To find:

The mass of MgCl₂ produced with 0.022 g of H₂ (0.01092 mol):

1 mol of MgCl₂ produced with → 1 mol of H₂, from stoichiometry.

0.01092 mol of MgCl₂ produce with → 0.01092 mol of H₂.

Thus, the mass of MgCl₂ produced = no. of moles * molar mass = (0.01092 mol)*(95.211 g/mol) = 1.04 g.

So, this statement is true.

Thus, the true statements are given above.

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Answer:

Explanation:

Solubility is the term used to designate the maximum amount of a solute that can be dissolved in a given amount of solvent, at a given temperature and pressure.

At start, you begin with pure water in the glass. This water is a pure substance, not a solution.

When you begin pouring sodium chloride into the glass of water, a solution, i.e. a homogenous mixture of solute and solvent, is formed.

This solution, at first, is diuted, which means that it contanins just few grams (matter) of the solute dissolved.

As, more sodium chloride is dissolved, the solution becomes more concentrated but is unsaturated. At some point, the water cannot dissolve more sodium chloride, because it has reached the maximum amount that can contain at that temperature and pressure. Then, the solution is saturated.

You can tell that the water is saturated, ie it contaiins the maximum amount of sodium chloride that can be dissolved, by that amount of water, at the given temperature, because from that point, you will note that as you pour more sodium chloride, it begins to pile up at the bottom of the glass. Hence, the true statement is the letter D: the water is saturated.

When sodium chloride starts to pile up at the bottom of the glass, it indicates that the water is saturated with dissolved salt and cannot dissolve any more, reaching a state of dynamic equilibrium between dissolving and recrystallization.

When the student observed that sodium chloride was piling up at the bottom of a glass of water, the correct statement is that the water is saturated. This means that the water cannot dissolve any more sodium chloride, regardless of how much extra is added. The previously dissolved NaCl(s) reaches a dynamic equilibrium with NaCl(aq), where the rate of salt dissolving into the water is equal to the rate of dissolved sodium chloride returning to its solid form. This equilibrium is the reason why any additional sodium chloride simply accumulates at the bottom of the glass without dissolving.

Moreover, when sodium chloride dissolves in water, it dissociates into sodium and chloride ions which are then surrounded by water molecules due to the polar nature of water. This hydrating process contributes to the increase in entropy, a measure of disorder, in the system.

Answer:

it is a spontaneous reaction.

Explanation:

It gets squeeze together so tightly that four hydrogen nuclei combine to form one helium atom. This is called nuclear fusion. In the process some of the mass of the hydrogen atoms is converted into energy in the form of light. The same process occurs in thermonuclear (fusion) bombs.

The fusion of two nuclei lighter than iron or nickel generally releases energy while the fusion of nuclei heavier than iron or nickel absorbs energy; vice-versa for the reverse process, nuclear fission. Nuclear fusion of light elements releases the energy that causes stars to shine and hydrogen bombs to explode.

Nuclear fission is the break down of a heavy nuclei to lighter isotopes. Nuclear fission is a spontaneous uncontrollable process. The chain reaction that results cannot be controlled naturally.

Nuclear fission is the process of decomposition of heavy radioactive unstable nuclei to produce two lighter nuclei which are having more half life. If the new products are of less half time they again undergoes fission.

Nuclear fission results in the release of tremendous energy that is used to generate power. The emission of alpha or beta particles by the radioactive nuclei results in the formation of new products.

Sometime the fission process goes uncontrolled through a chain reaction, where the first product again undergo fission to produce new isotopes which further initiates another fission if they are not stable.

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Answer:

Explanation:

Law of conservation of mass states that matter cannot be either created or destroyed.

A skeleton chemical equation shows the reactants and products of a chemical reaction without taking into account the real proportion in which the reactants combine and the products are obtained.

An example of a skeleton reaction is the combustion of methane:

Such as that equation is shown, there are four atoms of hydrogen in the reactants but only 2 atoms of hydrogen in the products. Also, there are 2 atoms of oxygen in the reactants but three atoms of oxygen in the products. This seems to show that some atoms of hydrogen have been destroyed and some atoms of oxygen have been created. This is impossible as it is against the law of conservation of matter.

Then, to show a real situation, the chemical equation of combustion must be balanced, adjusting the coefficients. This is the balanced chemical equation:

Now you see that the number of atoms of each matter is conserved: the number of carbon atoms in each side is 1, the number of atoms of hydrogen in each side is 4, and the number of atoms of oxygen in each side is 4. Thus, by balancing the chemical equation, the law of conservation of mass is not violated.

Chemical equations are balanced to comply with the law of conservation of matter by showing equal numbers of atoms on both sides of the equation, reflecting the conserved nature of matter during reactions and allowing accurate stoichiometric calculations.

We balance chemical equations to respect the law of conservation of matter, which states that matter cannot be created or destroyed. A balanced chemical equation ensures that there is an equal number of each type of atom on both sides of the equation, which reflects that matter is conserved during a chemical reaction. The coefficients in a chemical equation are used to represent the stoichiometric ratios and must be the simplest whole number ratio to illustrate the proportional relationship between reactants and products.

Chemical equations show the transformation of reactants into products, and balancing them allows chemists to predict the amounts of reactants needed and products formed. It is also essential for finding the limiting reagent, which dictates the maximum amount of product that can be formed.

Answer:

North Korea (The Korean War).

Explanation:

When Korea was liberated from Japanese control at the end of the Second World War, the United States and the Soviet Union agreed temporarily to divide Korea at the 38th parallel of latitude north of the equator. This division resulted in the formation of two countries: communist North Korea (supported by the Soviets) and South Korea (supported by the United States).

Answer:

The United States was successful in containing communism in South Korea, since it prevented its expansion into South Korea through its participation in the Korean War.

Explanation:

The Korean War was fought between 1950 and 1953 between communist North Korea and prowest South Korea. North Korea was militarily supported in the war by the People's Republic of China and the Soviet Union. South Korea was supported by the United Nations and received military assistance from various UN countries, led by the United States.

The direct cause of the conflict was the division of the Korean territory, that was annexed by Japan in 1910 after World War II. The northern part was occupied by the Soviet Union and the southern part by the United States. The 38th parallel was taken as the dividing line. The division would be temporary, but both parts soon developed into their own entities. The northern part became communist and the south became democratic. There was soon no longer a question of a peaceful merger of the two parts, and both parts considered using military force to conquer the other part.

After various border conflicts, the war started on June 25, 1950 with an invasion of North Korea on the south and ended on July 27, 1953 with a ceasefire, without a real winner having emerged. The new dividing line came close to the 38th parallel.

The most important result of this war was the rejection of communism from South Korea, which constituted itself as a main democratic force in Asia, along with Japan, thanks to the American support in the conflict.

There are 79.7 moles of tungsten atoms in 4.8 x 10^25 tungsten atoms, calculated by dividing the total number of atoms by Avogadro's number (6.022 x 10^23 atoms/mol).

To determine how many moles of tungsten atoms are in 4.8 x 10^25 atoms, we utilize Avogadro's number, which states that one mole of any substance contains 6.022 x 10^23 representative particles (atoms, molecules, etc.). To perform the conversion, we divide the total number of tungsten atoms by Avogadro's number.

The calculation would be:
(4.8 x 10^25 atoms of W) / (6.022 x 10^23 atoms/mol) = 7.97 x 10^1 mol of W

Therefore, there are 79.7 moles of tungsten atoms in 4.8 x 10^25 atoms.

Approximately 80.0 moles of tungsten atoms are in 4.8 x10²⁵.

To find the number of moles of tungsten atoms in 4.8 × 10²⁵ atoms, we can use Avogadro's number. Avogadro's number is 6.022 × 10²³ atoms/mol, which tells us the number of atoms in one mole of a substance.

Step-by-Step Solution:

moles of tungsten = (4.8 × 10²⁵ atoms) / (6.022 × 10²³ atoms/mole)

Now, perform the division:

moles of tungsten = 4.8 / 6.022 × [tex]10^{(25 - 23)[/tex]

moles of tungsten = 0.797 × 10²

moles of tungsten ≈ 79.7

Therefore, there are approximately 80.0 moles of tungsten atoms in 4.8 × 10²⁵ atoms of tungsten.

Answer:

Explanation:

Ionic bond is a bond which is formed as a result of transfer of electrons between an electronegative atom and very weakly electronegative one. For ionic bonds to be formed, an electronegativity difference greater than 0.7 between the two atoms must be achieved. This bond is usually between a metal and a non-metal. Due to this electron transfer, the atoms becomes oppositely charged.

Ionic compounds typically are soluble in polar solvents, they conduct electricity and are usually hard solids

                                                    while

Covalent bonds are formed as a result of sharing of electrons between atoms having zero or small electronegativity difference. The difference in electronegativity is usually less than 0.5. Most of the compounds are usually non-polar but in some cases when there is an uneven sharing of electrons, the compounds becomes polar.

Covalent compounds are usually gases and volatile liquids, most are non-conductors and are insoluble in polar solvents.

                                                 while

Metallic bonds are usually found in metals. They join atoms of metals and their alloys together. This bond type stems from an attraction between the positive nuclei of all closely packed atoms in the lattice and the electron cloud resulting from loss of valence electronic shells. The metallic bonds conditions the properties of metals like conductivity, malleability e.t.c.

Ionic bonds involve electrostatic attraction between a metal and a nonmetal, covalent bonds involve sharing of electrons between nonmetals, and metallic bonds entail a 'sea of electrons' moving freely among metal atoms.

Understanding the differences between ionic, covalent, and metallic bonds is fundamental in chemistry. Ionic bonds are formed by the electrostatic forces that exist between ions of opposite charges, typically involving a metal and a nonmetal. For example, sodium chloride (NaCl) is an ionic compound where a sodium ion (Na⁺) and a chloride ion (Cl⁻) are held together by this type of bond. On the other hand, covalent bonds are the result of two atoms, usually nonmetals, sharing a pair of electrons to achieve stability. An example of a covalent bond is the one found in a water molecule (H₂O) where each hydrogen shares an electron with oxygen. Lastly, metallic bonds are characterized by a 'sea of electrons' that are free to move around, which is what gives metals their characteristic properties like conductivity. This type of bond occurs between metal atoms, such as in copper or iron.