Which is not a physical property?
A) hardness
B) boiling point
C) ability to conduct electricity
D) ability to combine with oxygen

Answer: Alkaline earth metals, as this is shown by its location on the periodic table

Mg is a member of the c) alkaline earth metals family.

Group 2A (or IIA) of the Periodic Table is an alkaline earth metal. Beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), radium (Ra). They are harder and less reactive than Group 1A alkali metals.

Alkaline earth metals are named after the alkaline earths called beryllium, magnesia, limestone, strontium, and barite after their oxides. When mixed with water, these oxides are simple (alkaline).

The main difference between alkali metals and alkaline earth metals is that all alkali metals have one electron in the outermost shell, whereas all alkaline earth metals have two external electrons. That is.

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Answer:

A. Lose 4 electrons

Explanation:

The reaction equation is given as:

                  S + NO₃ → SO₂ + NO        

The half equation of the reaction for S:

                   S → SO₂

          For S to go into SO₂,

we move from an oxidation state of 0 to +4,

Finding the oxidation state of S in SO₂

                             a + (-2 x 2) = 0

                             a - 4 = 0

                              a = 4

This is a loss of 4 electrons

Answer:

Lose 4 electrons

Explanation:

Answer for Educere/ Founder's Education

Answer:

C. +5

Explanation:

Oxygen is always -2. And the sum of the oxidation numbers must be equal to the charge. So:

2x + 7(-2) = -4

2x - 14 = -4

2x = 10

x=5

Answer: The oxidation state of chromium in the given compound is +5.

Explanation:

Oxidation state is defined as the number which is given to an atom when it looses or gains electron. It is written as a superscript.

If the element gains electron, it will attain a negative oxidation state and if the element looses electrons, it will attain a positive oxidation state.

We are given a chemical compound having chemical formula of [tex]Cr_2O_7^{4-}[/tex]

We take the oxidation state of chromium atom be 'x'.

Oxidation state of oxygen atom = -2

Overall charge on chemical compound = -4

Evaluating the oxidation state of chlorine atom:

[tex]2(x)+7(-2)=-4\\\\x=+5[/tex]

Hence, the oxidation state of chromium in the given compound is +5.

Answer: The correct answer is Option D.

Explanation:

A non-polar covalent bond is defined as the bond which is formed between the atoms having no difference in electronegativity values. For Example: [tex]Cl_2,H_2[/tex] etc..

In this bond, the electrons are shared equally and [tex]\Delta EN[/tex] value is equal to 0.

Hence, the correct answer is Option D.

The correct answer is D. A nonpolar covalent bond is a type of covalent bond where electrons are shared equally between two atoms due to equal electronegativities.

The equal sharing occurs because the atoms have identical or nearly identical electronegativity values, meaning neither atom attracts the shared electrons more than the other. An example of a nonpolar covalent bond can be found in a molecule of chlorine, where both chlorine atoms share the electrons equally.

D. ( Neither ultrasonic nor infrasonic vibrations can be heard by humans. )

Answer:

The correct statement is option D, that is, neither ultrasonic nor infrasonic vibrations can be heard by humans.

Explanation:

The ultrasonic vibrations are the sound waves exhibiting the frequency of more than 20000 Hz, whereas the upper-frequency limit in human beings is about 20 Hz. Humans cannot hear the ultrasound as it is more than 20 Hz.  

On the other hand, the infrasonic vibrations refer to a low-frequency sound, it is lower in frequency in comparison to 20 Hz, that is, the usual limit of human hearing. Thus, for humans to perceive infrasound, the pressure of the sound must be adequately high.  

Answer:

1.overcome the attractive forces of other liquid particles

3.gain energy

Explanation:

A phase change from liquid to solid occurs when heat energy is added to the system. The heat energy gives the liquid molecules more kinetic energy and the attractive forces between the particles are overcome. When the molecules of liquid gains sufficient energy, they are free to move in all directions that they want, thus becoming gases.

Explanation:

In liquids, the molecules are held by less strong intermolecular forces of attraction as compared to solids. Due to which they are able to slide past each other. Hence, they have medium kinetic energy.

On the other hand, in gases, the molecules are held by weak Vander waal forces. Hence, they have high kinetic energy due to which they move rapidly from one place to another leading to more number of collisions.  

Hence, gases are able to expand more rapidly as compared to liquids.

Therefore, we can conclude that in order for a liquid particle to become a gas it must:

Answer:

c hopes this helps u pass or whatever

An ionic compound has a chemical formula that shows the ions in a molecule.

Ionic compounds are held by the electrostatic attraction between the atoms. The ionic compounds are formed by ions of different charges.

(a) The chemical formula of ionic compounds has a number subscript which indicates the number of atoms of the ion.

(b) The formula unit does not give the number of ions.

(c) The ionic compounds are not necessarily neutral as the charge difference between anion and cation results in the charged compound.

(d) The chemical formula of an ionic compound represents the ions in a molecule.

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If a neutral atom becomes negatively charged, it has undergone reduction.

Reduction is the process through which a neutral atom gain an electron (thus reducing its oxidation number) and turns into a negative ion (also known as : anion)

So basically none of the above

If a neutral atom becomes negatively charged, it has undergone reduction. Hence, option C is correct.

An atom contains a central nucleus surrounded by one or more electrons.

Protons are bound in the nucleus and can be neither gained nor lost. So any change in the charge of an atom is due to changes in its electron count. If a neutral atom gains electrons, then it will become negatively charged. If a neutral atom loses electrons, then it becomes positively charged.

The loss of electrons is the corresponding increase in the oxidation state of a given reactant is called oxidation. The gain of electrons and the decrease in the oxidation state of a reactant is called reduction.

Reduction is the process through which a neutral atom gains an electron (thus reducing its oxidation number) and turns into a negative ion (also known as an anion).

Hence, option C is correct.

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To calculate the delta H for the dissolution of KCl in water, use the heat equation q = mcΔT with the given mass, specific heat capacity of water, and the temperature change. Then, convert q to kilojoules and divide by the number of moles of KCl to find the enthalpy change per mole.

The question pertains to thermochemistry, a branch of chemistry that deals with the heat involved in chemical reactions and physical transformations. We need to calculate the enthalpy change (delta H) when KCl dissolves in water, which involves using the formula q = mcΔT, where q is the heat absorbed or released, m is the mass of the solvent (water), c is the specific heat capacity, and ΔT is the change in temperature.

First, we identify the temperature drop: ΔT = 21.6°C - 31.0°C = -9.4°C. This indicates that the solution absorbed heat (since the temperature of the water dropped, the reaction is endothermic). Then, using the specific heat capacity of water (4.18 J/g°C), we calculate q as follows:

q = mcΔT
= (75.0 g)(4.18 J/g°C)(-9.4°C)
= -2969.4 J

Since specific heat capacity and mass are both positive, the negative q value signifies that the heat was absorbed by the substance from the water. To find delta H in kJ/mol, we convert the mass of KCl to moles using its molar mass (74.55 g/mol) and then divide q by the number of moles:

Moles of KCl = 12.8 g / 74.55 g/mol
Approximately = 0.172 moles

Delta H = q / moles
= -2969.4 J / 0.172 mol
= -17261 J/mol

Since we need delta H in kilojoules per mole, we convert J to kJ:

Delta H = -17261 J/mol / 1000 J/kJ
= -17.261 kJ/mol

As the delta H is negative, it confirms that the dissolution of KCl in water is an endothermic process.

Your answer would be False

Answer: It would be false. thank me later.

Answer:

D. around 32 N.

Given that:

Explanation:

The dog is much smaller and lighter than the moon; it behaves like a point mass. Consider the equation for the size of gravity between a spherical mass and a point mass outside that spherical mass:

[tex]\displaystyle F = \frac{G\cdot M \cdot m}{r^{2}}[/tex],

where

The dog is at the surface of the moon. As a result, the [tex]r[/tex] shall be the same as the radius of the moon. Make sure all values are in SI units (kilograms and meters.) Apply the formula:

[tex]\displaystyle \begin{aligned}F &= \frac{G\cdot M \cdot m}{r^{2}} \\ &= \frac{(6.67\times 10^{-11})\times(7.348\times 10^{22})\times 20}{(1.7371\times 10^{6})^{2}}\\&= 32.48\;\text{N}\end{aligned}[/tex].

This value may vary slightly depending on the position of the dog on the moon.

Weight = (mass) x (acceleration of gravity)

Gravity on or near the moon's surface = 1.63 m/s^2

Dog's weight = (20 kg) x (1.63 m/s^2)

Weight = 32.6 Newtons (D)

Answer:

Option A

Explanation:

Hi Jacobpalacios! How are u?

Here are the justifications of my choice:

A. TRUE. Organisms have different ranges of tolerance depending on the type of organism and the species (microorganisms, fungi, plants, animals or even humans have different ranges of tolerance, for example at temperature). In other words, different types of organisms have different tolerance ranges for the same factor.

B. FALSE.  The tolerance range represents the number of individuals in a population that lives under a certain range of a given factor (no the ecosystem in general). For example, we can know the number of individuals who tolerate a certain concentration of oxygen.

C. FALSE. The tolerance range is affected by abiotic factors (environmental conditions), not biotics. For example, temperature, oxygen, acidity of the environment, etc.

D. FALSE. Most individuals need a minimum percentage of water for their organisms or organelles to function. Therefore, the availability of water will be a factor that impacts the tolerance range of an organism.

I hope I've been helpful!

Regards!

Answer:

using charles law , volume of gas is 525.7 L

Explanation:

Charles law states for a fixed mass of gas the volume is directly proportional to absolute temperature at constant pressure.

V1 / T1 = V2 / T2

V1 is volume and T1 is temperature at first instance

V2 is volume and T2 is temperature at second instance

substituting the values in the equation

480 L / 315 K = V2 / 345 K

V2 = 525.7 L

therefore new volume is 525.7 L

Answer:

K = 1.15 x 10⁻⁹.

Explanation:

ΔG°rxn = - RTlnK.

where, ΔG°rxn is the standard free energy change of the reaction.

R is the general gas constant (R = 8.314 J/mol.K).

T is the temperature of the reaction (K) (T = 298.0 K).

K is the equilibrium constant.

ΔG°rxn = ΣG°f, products – ΣG°f, reactants

ΔG°rxn = [3(G°f, NO₂) + (G°f, H₂O)] - [2(G°f, HNO₃) + (G°f, NO)]

ΔG°rxn = [3(51.3 kJ/mol) + (- 237.1 kJ/mol)] - [2(- 110.9 kJ/mol) + (87.6 kJ/mol)

ΔG°rxn = (- 83.2 kJ/mol) - (- 134.2 kJ/mol) = 51.0 kJ/mol.

∵ ΔG°rxn = - RTlnK.

∴ lnK = - (ΔG°rxn)/(RT) = - (51000 J/mol)/(8.314 J/mol.K)(298.0 K) = - 20.58.

∴ K = 1.15 x 10⁻⁹.

The equilibrium constant, K, for a particular reaction can be derived from the standard free-energy changes of reactions. First, calculate ΔG° by adding the ΔG°f values of the products, subtracting those of the reactants, then use the equation ΔG° = -RT lnK to solve for K.

This problem is a matter of utilizing the formula to calculate the equilibrium constant (K) from the standard free-energy changes of reactions (ΔG°f). For this particular reaction 2 HNO3(aq) + NO(g) → 3 NO2(g) + H2O(l), we need to express ΔG° for the reaction in terms of the ΔG°f values given, using the formula:

ΔG° = Σ n ΔG°f (products) - Σ m ΔG°f (reactants)

Where, n and m are the stoichiometric coefficients. After calculating ΔG°, we can derive the equilibrium constant, K, using the equation:

ΔG° = -RT lnK

Where, R is the universal gas constant (8.314 J/mol.K), T is the temperature in Kelvin and K is the equilibrium constant. Solving for K gives the equilibrium constant for the reaction at 298 K.

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Answer:

E. 16.6 mol HCl

Explanation:

The equation for the reaction is;

Zn + 2 HCl --> ZnCl2 + H2

From the reaction 2 moles of HCl produces 1 mole of ZnCl2

Therefore; 8.3 moles of ZnCl2 will be produced by;

  = 8.3 moles ×2

  = 16.6 Moles of HCl

  Therefore;  E.  16.6 mol HCl

Answer:

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

Explanation:

[tex]\rm 2H^{+} + CrO_{2}^{3-} + \textbf{Ba}^{2+} + 2OH^{-} \longrightarrow \textbf{Ba}^{2+} + CrO_{2}^{4-} + 2H_{2}O[/tex]

The spectator ions are the ions that are on both sides of the equation.

[tex]\text{In this equation, the spectator ions are }\boxed{\textbf{Ba}^{2+}}.[/tex]

They are present at the beginning and at the end of the reaction. They don't take part in the reaction. They are simply "spectators" watching the other ions "do their thing."

Spectator ions remain unchanged during a chemical reaction and are crucial in identifying the net ionic equation.

When looking at the total ionic equation 2H+ + CrO2 3- + Ba2+ + 2OH-
ightarrow Ba2+ + CrO2 4- + 2H2O, spectator ions are those that do not participate in the reaction and are present in the same form on both the reactant and product sides of the equation. In this case, the Barium ion (Ba2+) is the spectator ion since it does not change from reactants to products.

Spectator ions are ions that do not participate in a chemical reaction and remain unchanged during the reaction. They can be identified by observing which ions are present on both sides of the equation with the same coefficients. By canceling out the spectator ions, you can obtain the net ionic equation, which focuses only on the species directly involved in the reaction.

Answer: The correct answer is "It's the tendency for the body to resist a change in motion".

Explanation:

Newton's First Law of motion addresses a body at rest or in motion. This law is also known as "Law of inertia".

Inertia resists any change in the state of the object. Mass is a measure of inertia.

If the object is in motion then it remains in this state or if the object is at rest then it remains in this state unless the external force is applied.

If the object is moving with constant velocity then it will remain moving with this velocity unless it is accelerated.

Suppose, bus driver applies suddenly applies brake. The passenger sitting inside the bus falls forward. It is due to inertia. As the passenger does not want to change its state. It resists this change. The upper part of the body wants to remain in the state of motion. It's the tendency for the body to resist a change in motion

Therefore, the correct option is (D).

Answer:

D.These elements tend to gain or lose electrons easily is incorrect.

Explanation:

Noble gasses consist of atoms that have full rings of electrons. Electrons are what bond atoms together to create chemical compounds, and incomplete rings are needed for the process.

D. These elements tend to gain or lose electrons easily

The gases which are considered as Nobel are generally nonreactive. Truth be told, they are the least responsive components on the periodic table. This is on the grounds that they have a total valence shell. They tend to pick up or lose electrons rarely.

In 1898, Hugo Erdmann begat the expression “Nobel gas” to mirror the low reactivity of these components, similarly as the respectable metals are less receptive than different metals. These gases have high energies of ionization and immaterial electronegativities. These gases have low breaking points and are on the whole gases at room temperature.

are a type of force acting between atoms and molecules.[1] They are part of the van der Waals forces. The LDF is named after the German-American physicist Fritz London.

First of all, disperse means to break away.

So dispersion forces are forces that cause molecules to break away from each other. Dispersion forces are a very very weak force because the molecules are not attracted to each other because they disperse or move away.

Answer:

c) 8 protons 10 electrons

Because there would usually be 8 of both, but in this case there has to be 2 more electrons to give it the ²⁻ charge

Final answer:

Smaller marble chips react faster with acid due to the increased surface area, leading to a greater loss of mass in the same time frame compared to larger chips. Hence, the best description is that small chips would lose 4 grams over 7 minutes (option C).

Explanation:

When considering the reaction of marble chips with acid, the rate at which the reaction occurs depends largely on the surface area of the marble that is exposed to the acid. Smaller chips have a larger surface area relative to their volume, allowing more acid to come into contact with the chips, thus increasing the rate of the reaction. Marble (Ca[tex]CO_{3}[/tex]) reacts with hydrochloric acid (HCl) to form calcium chloride, water, and carbon dioxide gas. As the reaction proceeds, the mass of the marble decreases because carbon dioxide gas is released and escapes into the air.

Based on this explanation, option C is the best description of how small chips would react: The small chips would react faster, losing 4 grams over the same 7 minutes. This is because the small chips provide a greater surface area for the acid to react with, leading to a faster reaction rate and therefore a greater loss of mass in the same amount of time compared to larger chips.

a because as temperature increases, reaction rate increases.

Answer:

The correct answer is the table of point A.

Explanation:

An increase in temperature increases the speed of reaction, regardless of whether the reaction is endothermic or exothermic. This is because as the temperature increases, the number of molecules with an energy equal to or greater than the activation energy increases, thus increasing the number of effective shocks.

Have a nice day!

The conjugate acid is formed when the base gains an [tex]H^+[/tex]. Hence, option D is correct.

An acid and a base which differ only by the presence or absence of a proton are called a conjugate acid-base pair.

In the Brønsted–Lowry definition of acids and bases, a conjugate acid-base pair consists of two substances that differ only by the presence of a proton (H⁺).

A conjugate acid is formed when a proton is added to a base, and a conjugate base is formed when a proton is removed from an acid.

Hence, option D is correct.

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Answer:

1.3 M.

Explanation:

mass of the solution = mass of MgCl₂ + mass of water

mass of MgCl₂ = 20.1 g.

mass of water = d.V = (157.0 mL)(1.0 g/cm³) = 157.0 g.

∴ mass of the solution = mass of MgCl₂ + mass of water = 20.1 g + 157.0 g = 177.1 g.

V of the solution = (mass of the solution)/(density of the solution) = (177.1 g)/(1.089 g/cm³) = 162.62 mL = 0.163 L.

Molarity is the no. of moles of solute dissolved in a 1.0 L of the solution.

M = (no. of moles of MgCl₂) / (Volume of the solution (L)).

∴ M = (mass/molar mass)of MgCl₂ / (Volume of the solution (L)) = (20.1 g/95.211 g/mol) / (0.163 L) = 1.29 M ≅ 1.3 M.

Answer:

2. Inorganic

Explanation:

All man-made and most carbon-based compounds are inorganic

Answer:

inorganic

Explanation:

Answer:

Explanation:

Electrolysis of aqeous sodium chloride(NaCl)

Electrolysis is a process that converts electrical energy into chemical energy.

Electrolytic processes involves three major steps:

1. Ionization of electrolyte and water

2. Migration of ions to electrodes

3. Discharge of ions at the electrodes.

For the Electrolysis of brine, we follow these three steps:

1. Ionization of the aqeous brine solution:

NaCl → Na⁺ + Cl⁻

H₂O ⇄H⁺ + OH⁻

2. Migration of ions to the electrodes

The positive charges Na⁺ and H⁺ would both go to the cathode which is the negatively charged electrode

The negative charges Cl⁻ and OH⁻ migrates to the anode which are the positively charged electrodes. The anode is positively charged electrode.

3. Discharge of ions at the electrodes.

The preferential discharge of ions is based on the activity series and concentration of the ions.

On the activity series H is lower and it discharges preferentially to Na in the cathode:

2H⁺ + 2e⁻ → H₂

At this electrode, the cathode, reduction occurs and H⁺ ions are reduced.

At the anode Cl⁻ and OH⁻ migrates. But Cl⁻ is discharged preferentially due to its higher concentration.

2Cl⁻ ⇄ Cl₂ + 2e⁻

This is the oxidation half and Cl is oxidized

Answer:

See below  

Explanation:

         Name          Formula             Major species              

Zinc iodide              ZnI₂            H₂O(ℓ),  I⁻(aq), Zn²⁺(aq),  

Nitrogen(I) oxide     N₂O           H₂O(ℓ),  N₂O(aq)

Sodium nitrite         NaNO₂      H₂O(ℓ),  Na⁺(aq), NO₂⁻(aq)

Glucose                   C₆H₁₂O₆    H₂O(ℓ),  C₆H₁₂O₆(aq)

Nickel(II) iodide       NiI₂            H₂O(ℓ),  I⁻(aq), Ni²⁺(aq)

Chemical compounds when dissolved in water dissociate into constituent ions or remain as molecules.  ZnI2, NaNO2, and NiI2 will dissociate into respective ions. N2O and C6H12O6 will not dissociate and will exist as molecules in water.

When the given compounds are dissolved in water, they dissociate into their constituent ions or remain as molecules. For Zinc Iodide (ZnI2), it will dissociate into Zn2+ and I- ions. Hence, the major species present will be H2O, Zn2+, and I-. Dissimilarly, Nitrous Oxide (N2O) will not dissociate in water. Its major species present will be the molecules themselves, N2O, and water. For Sodium Nitrate (NaNO2), it will dissociate into Na+ and NO2- ions, hence the major species will be Na+, NO2-, and H2O. In the case of Glucose (C6H12O6), it will not dissociate in water and will be present as a molecule, so the major species will be the glucose molecule and water. Lastly, in the case of Nickel (II) Iodide (NiI2), it will dissociate into Ni2+ and I- ions, thus the major species will be Ni2+, I- and H2O.

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Try this solution, all the details are described in the attached picture.

Answer:

3 x = 3.

Value of x = 1 and y = 10.

Explanation:

-2x + y = 8

5x - y = -5

5x + (-2x) + y + (-y) = 8 + (-5)

∴ 3 x = 3.

∴ x = 1.

-2(1) + y = 8.

∴ y = 10.

Answer:

3x =  3

Explanation:

Got it right on edge 2020 :)

Answer:

If you are given a chemical equation and specific amounts for each reactant in grams, you have to follow these steps, in order, to determine how much product can possilby be made:

Justification:

The balanced chemical equation, through the coefficients, represents the proportions, in terms of mole ratios, in that each reactant chemically react with each other to form each product.

So, if you are given specific aomunts for each reactant in grams, you must start by converting each reactant amount into mole numbers, using the molar mass of each one.

Then, using the theoretical mole ratios (from the coefficients of the balanced chemical equation) you can determine how much of each product can be produced, in terms of moles, first starting with the complete consumption of one of the reactants, and then doing the same with each of the other reactants, one by one.

The reactant that yields the least amount of product is the limiting reactant, since it will be consumed completely once that amount of product is obtainded, while the other reactants will be in excess.

Now, that you have the number of moles that can be produced from the limiting reactant, you can convert it into grams of product, just using the molar mass of the same.

Final answer:

To determine how much product can be made from given amounts of reactants, balance the chemical equation, convert reactant masses to moles, identify the limiting reactant, calculate the moles of product, and then convert these moles to grams.

Explanation:

When given a chemical equation and specific amounts of reactants in grams, the steps to determine how much product can be made are as follows:

To identify the limiting reactant, a key point to remember is that it's the reactant that yields the lesser amount of product when the moles of each reactant are individually compared to the moles of product dictated by the balanced equation. This concept applies whether we calculate the number of moles or the final mass of the product.