Describe a structure of a ecosystem

Answer: The answer would be A;They measure the amount of greenhouse gases in the atmosphere, and the temperature over many years.

Explanation: If scientists only went off of clouds, they'd only be able to tell if it is about to rain. If they only observed the oceans, they'd only be able to tell when a tornado or tsunami was about to occur.

Answer: The answer is A. Thay measure the amount of greenhous gases in the atmosphere and the temperature over many years

Explanation:

Answer:

[tex]\boxed{\text{D. Resonance}}[/tex]

Explanation:

If an external vibration matches the drum's natural frequency, it will induce the can to vibrate. This is an example of resonance.

It is analogous to pumping your legs in synchronization with a swing's natural frequency.

The acid dissociation constant (Ka) for acetic acid, given the initial concentration of 0.200 M and the equilibrium concentration of H3O+ is 0.0019 M, is 1.82 × 10⁻µ.

To calculate the acid dissociation constant (Ka) for acetic acid, we can use the information provided that the initial concentration of acetic acid is 0.200 M and the equilibrium concentration of H3O+ is 0.0019 M. Using the chemical equation for the dissociation of acetic acid (CH3COOH):

CH3COOH(aq) ⇌ CH3COO−(aq) + H3O+(aq),

we know that at equilibrium, the concentration of H3O+ ions will be the same as the concentration of CH3COO− ions. Therefore, [CH3COO−] = [H3O+] = 0.0019 M.

Because acetic acid is a weak acid, we can assume that the change in concentration of acetic acid is roughly equal to the concentration of H3O+ ions produced. Thus, the equilibrium concentration of CH3COOH will be 0.200 M - 0.0019 M = 0.1981 M. The formula for Ka is:

Ka = [CH3COO−][H3O+] / [CH3COOH]

Substituting the equilibrium concentrations into this formula gives:

Ka = (0.0019 M)(0.0019 M) / (0.1981 M) = 1.82 × 10⁻µ,

which is the Ka for acetic acid.

Answer:

either 58.1 or 1075

Explanation:

250 / 4.3 = 58.1

250 * 4.3

Answer: most contain the same basic components of pigments, oils, waxes, and preservatives.

Explanation: YOOOO was up :))))))

The pH of the solution resulting from the dissolution of 106.3 g HCl in 175.0 L of water is 1.77.  

The pH of a solution is given by:

[tex] pH = -log([H_{3}O^{+}]) [/tex]  (1)

Since HCl is a strong acid, we have that:

[tex] [H_{3}O^{+}] = [HCl] [/tex]

We can calculate the concentration of HCl from its mass and the volume of solution:

[tex] [HCl] = \frac{106.3 g}{175.0 L}*\frac{1 mol}{36.46 g} = 0.017 g/mol [/tex]

Hence, the pH is (eq 1):

[tex] pH = -log([H_{3}O^{+}]) = -log(0.017) = 1.77 [/tex]      

Therefore, the pH of the solution is 1.77.

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no significant change

Explanation:

When an atom emits a beta particle, a neutron is changed into a proton by emitting an electron. The electron has a negligible mass (very small), hence there is no significant change in atomic mass.

Answer:

2Na₂O₍s₎+ 2Cl₂₍g₎⇒4 NaCl₍s₎ +O₂₍g₎

Explanation:

The more reactive chlorine gas displaces the less reactive oxygen gas from the compound sodium oxide. The correct equation is C. because the number of each type atom on each side is equal hence the equation is balanced. There are 4 sodium atoms on the left side as there are on the right, 4 chlorine on both sides and two oxygen on both sides.

Answer : The correct equation will be,

[tex]2Na_2O(s)+2Cl_2(g)\rightarrow 4NaCl(s)+O_2(g)[/tex]

Explanation :

The given reactions are:

(1) [tex]2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)[/tex]

(2) [tex]4Na(s)+O_2(g)\rightarrow 2Na_2O(s)[/tex]

Both the given chemical reactions are balanced chemical reaction. So, in order to get the final equation we first multiply equation 1 by 2 and reverse the equation 2 then add both the equations, we get the overall equation for the reaction the produces [tex]NaCl[/tex] and [tex]O_2[/tex] from [tex]Na_2O[/tex] and [tex]Cl_2[/tex]

(1) [tex]4Na(s)+2Cl_2(g)\rightarrow 4NaCl(s)[/tex]

(2) [tex]2Na_2O(s)\rightarrow 4Na(s)+O_2(g)[/tex]

The final reaction will be,

[tex]2Na_2O(s)+2Cl_2(g)\rightarrow 4NaCl(s)+O_2(g)[/tex]

When a practice is sustainable, it means that it can be used over and over through time. Sustainable practices also benefit, rather than harm, the environment. Though it really depends on where you live, the general answer for this would be wind farms since flood irrigation can only happen in certain conditions. Overfishing would destroy a species over time, and clear cutting is obviously harmful to the environment.

The sustainable practice can be described as one that can be seen in A. Wind farms . option A  is correct.

It has the capacity to be maintained, upheld, or affirmed. Science of the environment. the property of not being environmentally destructive or depleting natural resources, promoting long-term ecological balance: The committee is creating sustainability criteria for energy-using products.

Sustainable practices promote the health and vitality of the environment, people, and the economy. According to sustainability, resources are limited and should be used prudently with an eye toward long-term goals and the effects of how they are used.

Hence ,  option A  is correct.

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The answer would be a. C2H4(ethylene)

1C2H4+3O2~>2CO2+2H2O

Answer:

a. C2H4.

Explanation:

Let's look at the balanced equation for C2H4.

C2H4  + 3O2 -->  2CO2 + 2H2O

So 1 mole of this hydrocarbon reacts with 3 moles of oxygen and since  1 mole of one gas occupies the same volume as another gas, the volumes  will be in the ratio 1:3.  So this is the required hydrocarbon.

Iron and aluminum are examples of elements, which are pure substances that cannot be broken down into simpler substances by chemical changes. Both are naturally occurring and widely used in various applications.

Iron and aluminum are examples of elements. Elements are pure substances that cannot be broken down into simpler substances by chemical changes. Iron and aluminum both occur naturally on earth and are widely used in various applications. For example, iron is a key component in steel making and is also an important element in hemoglobin in the blood, while aluminum is a good reducing agent and is used in a multitude of products such as foil and cookware. Other examples of elements include silver, gold, sulfur, oxygen, and copper.

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Answer:

Graphite has a giant covalent structure in which:

each carbon atom is joined to three other carbon atoms by covalent bonds

the carbon atoms form layers with a hexagonal arrangement of atoms

the layers have weak forces between them

each carbon atom has one non-bonded outer electron, which becomes delocalised:

A crystal of graphite contains a  covalent structure.

This is an example of a substance with a huge covalent bond structure. It contains a lot of silicon and oxygen atoms. All atoms in the structure are linked to each other by strong covalent bonds. Atoms combine in a regular arrangement to form a huge concurrent structure.

A giant covalent bond structure is a three-dimensional structure of atoms bonded by covalent bonds. Allotropes are different forms of the same element in the same state. Graphite, graphene, and diamond are allotropes of the same element (carbon) in the same state (solid). Carbon can form up to 4 covalent bonds

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Answer:

The molarity of the solution remains unchanged.

Explanation:

Consider the formula for the molarity [tex]M[/tex] of a solution:

[tex]\displaystyle M = \frac{n}{V}[/tex],

where

For this salt solution,

Initial molarity:

[tex]\displaystyle M_{0} = \frac{n_{0}}{V_{0}}[/tex].

Final molarity:

[tex]\displaystyle M_{1} = \frac{n_{1}}{V_{1}} = \frac{3\;n_{0}}{3\;V_{0}} = \frac{n_{0}}{V_{0}} = M_{0}[/tex].

In other words, the molarity of the solution remains unchanged.

Answer:

The molarity of the solution remains unchanged

Explanation:

Answer:

[tex]\boxed{\text{864 kJ}}[/tex]

Explanation:

The formula for the heat transferred to or from an object is

q = mCΔT

Data:

m = 2.94 kg

C = 1.75 J·°C⁻¹g⁻¹

T₁ = 23 °C

T₂ = 191 °C

Calculations:

(a) Convert the mass to grams

m  = 2.94 kg = 2940 g

(b) Calculate ΔT

ΔT = T₂ - T₁ = 191 – 23 = 168 °C

(c) Calculate q

q = 2940 × 1.75 × 168 = 864 000 J = 864 kJ

You must provide[tex]\boxed{\textbf{864 kJ}}[/tex].

Answer:

The chemical name ends with “hydroxide.”

Explanation:

1- we write the name of the metal first and after that write the nonmetal:

Ex : NaOH ( sodium hydroxide)

2- any compound contains OH group is an ionic base and this group called hydroxide group

3- "Ous" ending is given in the ions with the lower oxidation.

4- " ic" ending is given in the ions with the higher oxidation.

So, the correct answer is: The chemical name ends with “hydroxide.”.

Answer:

The chemical name ends with “hydroxide

Explanation:

got right on edge 2020

Answer:

Organic chemistry is a subdiscipline of chemistry that studies the structure, properties and reactions of organic compounds, which contain carbon in covalent bonding. Study of structure determines their chemical composition and formula.

Answer:

acid rain is produced from harmful emissions in the air clinging to the water molecules and coming down as rain

Explanation:

The type of acid rain that contains water is called wet deposition. Acid rain formed with dust or gasses is called dry deposition.

Answer:

deez nuttts

Explanation:

Element 50

Symbol Sn

TIN

Answer:

Polar Covalent

Explanation:

Chlorine and Fluorine are both halogens. They are in group VII.

The Pauling's electronegativity value of these elements are:

F = 4.0

Cl = 3.0

Electronegativity of an element is a property that combines the ability of its atom to lose and gain electrons. It can be used to predict bond type.

For heteronuclear molecules where the electronegativity difference is between 0.5 and 1.7 there will not be an equal sharing of the electron pair between the atoms involved.

The bond that results is a Polar Covalent bond.

When the electronegativity difference is zero or less than 0.5, a non-polar covalent bond forms. There would be an equal sharing of the electron pair donated.

Answer:

9.32 g.

Explanation:

M = (no. of moles of NH₄Cl)/(Volume of the solution (L))

M = 0.875 M.

no. of moles of NH₄Cl = ??? mol,

Volume of the solution = 300 mL = 0.3 L.

∴ (0.875 M) = (no. of moles of NH₄Cl)/(0.3 L)

∴ (no. of moles of NH₄Cl) = (0.875 M)*(0.3 L) = 0.2625 mol.

no. of moles of NH₄Cl = mass/molar mass

∴ mass of NH₄Cl = (no. of moles of NH₄Cl)*(molar mass) = (0.2625 mol)*(53.491 g/mol) = 9.316 g ≅ 9.32 g.

The mass of ammonium chloride dissolved in 300 mL of a 0.875M solution is 14.90 g.

To find the mass of ammonium chloride dissolved in 300 mL of a 0.875M solution, we need to use the formula:

Mass = Volume x Concentration x Molar mass

The molar mass of ammonium chloride is 53.49 g/mol. Substituting the given values, we get:

Mass = 0.300 L x 0.875 mol/L x 53.49 g/mol = 14.90 g

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Answer:

3.125 grams.

Explanation:

∵ Thulium-167 has a half life of 9.0 days.

∴ The time is needed to calculate the grams are left after (36.0 days) represents (36.0 days / 9.0 days) = 4.0 half-lives.

50.0 grams → (first half life) 25.0 grams → (second half life) 12.5 grams → (third half life) 6.25 grams → (fourth half life) 3.125 grams.

So, the grams are left after 36.0 days = 3.125 grams.

Final answer:

The use of aerosol sprays and coolants that release chlorine and bromine gases contributes to ozone layer destruction, leading to increased UV radiation and environmental harm. The Montreal Protocol helped reduce emissions of ozone-depleting substances, slowing the rate of depletion.

Explanation:

The human activity that most likely contributes to ozone layer destruction is the release of chlorine and bromine gases through the use of products like aerosol sprays and coolants. These substances are known as ozone-depleting substances (ODS), and include chemicals such as chlorofluorocarbons (CFCs).

When these substances reach the stratosphere, they release halogen radicals that catalytically destroy ozone molecules, leading to ozone depletion. This has severe environmental and health impacts, such as increased UV radiation leading to higher rates of skin cancers and disrupted ecosystems. The Montreal Protocol was a successful international effort to phase out the production and use of ODS, which has led to a decrease in the rate of ozone depletion, but vigilance and continued reduction of emissions are essential to protect the ozone layer.

A. N would probably be the one

Answer:

ΔG = - 2.0 kJ/mol and the reaction is spontaneous.

Explanation:

∵ ΔG = ΔH - TΔS,

ΔH = - 44.0 kJ/mol, T = 350.0 K, ΔS = - 0.12 kJ/K.mol.

∴ ΔG = ΔH - TΔS = (- 44.0 kJ/mol) - (350.0 K)(- 0.12 kJ/K.mol) = - 2.0 kJ/mol.

The sign of ΔG assigns the spontaneity of the reaction:

∵ ΔG has a negative value, so the reaction is spontaneous.

ΔG = - 2.0 kJ/mol and the reaction is spontaneous.

Answer:

2:2

Explanation:

The question is on mole ration in a chemical equation.

Steps to identify mole ratio in an equation

2H₂ + O₂⇒ 2H₂O------------------This equation is balanced. how?

Number of hydrogen atoms in reacting side= 2×2=4

Number of hydrogen atoms in the products side= 2×2=4

Number of oxygen atoms in the reacting side=2

Number of oxygen atoms in the product side =2

Writing the mole ratio in the equation

2H₂ + O₂⇒ 2H₂O

2         1        2

Mole ratio of hydrogen to water

2H₂ + O₂⇒ 2H₂O

2                  2

=  2:2

Answer:

athlete’s foot and ringworm- third choice

The two common fungal skin infections that humans can contract are athlete's foot and ringworm. They are both caused by fungi called dermatophytes, treated with antifungal creams and powders, and more persistent cases may require prescription medication.

The two common fungal skin infections that humans can contract are athlete's foot and ringworm.

Athlete's foot, medically known as tinea pedis, is a contagious infection that affects the skin on the feet and can spread to the toenails and sometimes the hands.

It is characterized by a scaly rash that usually causes itching, stinging, and burning.

Ringworm, or tinea corporis, is not caused by a worm but by a fungus, and it presents as a red, circular rash on the skin.

Both of these infections are caused by dermatophytes, which are fungi that feed on keratin, a protein found in skin, hair, and nails.

These infections are typically treated with over-the-counter antifungal creams and powders, although more persistent cases might require prescription medication.

Answer:

Q1: 1.67 L.

Q2: Saturated solution.

Explanation:

Q1:

(MV) before dilution = (MV) after dilution

M before dilution = 10.0 M, V before dilution = 0.5 L.

M after dilution = 3.0 M, V after dilution = ??? L.

∴ V after dilution = (MV) before dilution / M after dilution = (10.0 M)(0.5 L) / (3.0 M) = 1.67 L.

Q2:

From the given curve, it is clear that the solubility of sodium nitrate at 35.0°C is 100 g per 100 g of water.

So, the mentioned solution is a saturated solution at this T.

A saturated solution is a chemical solution containing the maximum concentration of a solute dissolved in the solvent.

Answer:

impossible

Explanation:

Answer:

Kinetic energy

Potential energy

Motion energy

Answer:

Prokaryotes have no cell nucleus and no membrane enclosed organelles. Prokaryotic DNA can be found in a coiled loop floating in the cytoplasm in a region called the nucleoid (meaning nucleus-like). In other words, the nucleoid is the area in a prokaryotic cell where DNA is located.

Explanation:

The DNA in prokaryotes is found in the nucleoid region, which is the central part of the cell where their single, circular chromosome is located along with concentrated DNA-associated proteins and plasmids. So the correct option is B.

The DNA in a prokaryote is located in a central part of the cell known as the nucleoid region. Prokaryotes, which include Bacteria and Archaea, have a single, circular chromosome that is not bound by a complex nuclear membrane. This chromosome is found within the nucleoid region, and this area does not readily stain, making it appear lighter in color when viewed with a transmission electron microscope. Additionally, the prokaryotic DNA and DNA-associated proteins are concentrated within this region. Prokaryotes often possess plasmids as well, which are shorter, circular DNA molecules that can carry traits such as antibiotic resistance and can be transferred independently during cell division.

Answer:

28.28 L.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

P₁V₁ = P₂V₂

P₁ = 700.0 mm Hg, V₁ = 4.0 L.

at burst: P₂ = 99.0 mm Hg, V₂ = ??? L.

∴ V₂ = P₁V₁/P₂ = (700.0 mm Hg)(4.0 L)/(99.0 mm Hg) = 28.28 L.