2 Use the chart to answer the question. Solubility Curves of Various Salts 180 160 140 120 100 80 KNO3 in g NaCl in g KCl in g Amount of Solute Dissolved in 100 g of Water (grams) 60 40 20 20 40 60 80 100 1200 20 Temperature (°C) If a student makes a saturated solution of potassium nitrate at 80°C, then cools it to 20°C, how many grams of solute would precipitate out of the solution? MO A B C D 10 g 20 g 60 g 140 g​

Answer:

More radiation entering the earth's atmosphere.

Explanation:

The ozone layer is layer of O₃ (oxygen) and prevents most radiation from reaching earth.

The coefficients of H2S and HNO3 in the balanced reaction equation are 2 and 3 respectively.

In a chemical reaction, reactans interact in a unique way to form products. In this case, the unbalanced reaction equation is; H2S + HNO3-----> NO + H2O.

Since this reaction is redox and electrons are lost/gained in the process, the coefficients of H2S and HNO3 in the balanced reaction equation are 2 and 3 respectively.

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Answer:

Explanation:

1st: 3

2nd: 2

Answer:

10 atm

Explanation:

There's a lot to do here, but lets take it one step at a time. First, let's write a balanced equation for the decomposition of potassium chlorate into potassium chloride and oxgyen gas.

2 KClO3 → 2 KCl + 3 O2

Now let's find the moles of the KClO3 (molar mass 122.55 g/mol) that we have take 10 g/122.55 g/mol, grams will cancel and we are left with 0.0816 moles. lets divide that by two since we have a two in front of the KClO3 in the equation, and then multiply that number by 5 since it's the total moles of products, in summary, multiply by 5/2 to get 0.204 moles.

Now that we know the moles of our products, let's plug some stuff into the ideal gas law PV = nRT. We are looking for P so let's solve for that. P = (nRT)/V, now let's plug in our values. Make sure V is converted to liters so 0.5 L. And convert celcius to kelvin by adding 273

P = ((0.204 moles)(318 K)(0.08206 L atm mol^-1 K^-1))/0.5 L

A lot of units cancel, and we get about 10.65 atm, if you don't want the answer in atm, you can find a conversion equation. But let's round to sig figs for now, which will bring us to 10 atm.

Answer:

a. energy changes during heating.

b. energy changes during chemical reactions.

c. color changes during chemical reactions.

d. Both (a) and (b)

Explanation:

The answer is D.Both (a) and (b)

1066.7 ml of the stock solution must start with, preparing 2.00 L of a 0.800 M NaNO3 solution.

Volume is the space occupied by a three-dimensional object.

By the formula [tex]\rm M_1V_1= M_2V_2[/tex]

M1 is the initial molarity, 1.5 M

M2 is the final molarity, 0.800 M

V1 is the initial volume

V2 is the final volume, 2.00 L

Putting the values in the equation

[tex]\rm 1.5\;M \times V_1= 0.800\;M \times 2.00\;L\\\\V_1 = \dfrac{ 0.800\;M \times 2.00\;L}{1.5\;M} = 1066.7\;ml[/tex]

Thus, the initial volume is 1066.7 ml

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The amount of CaCO₃ that are consumed at the reaction is 6.7 grams.

Ideal gas equation will be represented PV = nRT from which we can calculate the moles of carbon dioxide, where

On putting all these values, we get

n = (1)(1.5) / (0.082)(273) = 0.0669 moles = 0.067 mol

Given chemical equation is:

CaCO₃ + 2HCl → CO₂ + CaCl₂ + H₂O

From the stoichiometry of the reaction it is clear that,

1 moles of CO₂ = produced by 1 moles of CaCO₃

0.067 moles of CO₂ = produced by 0.067 moles of CaCO₃

Now mass of CaCO₃ will be calculated as:

n = W/M, where

W = (0.067)(100) = 6.7g

Hence required mass of CaCO₃ is 6.7g.

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Answer:

Co²⁺ and PO₄³⁻

Explanation:

Strong electrolytes completely dissolve in water. Therefore, the ionic bonds between the cation and anion in Co₃(PO₄)₂ would break apart. The resulting ions would be Co²⁺ and PO₄³⁻. The phosphate (PO₄³⁻) would NOT further seperate because the phorphorus and oxygen bonds are covalent, not ionic. Phosphate ions are a type of polyatomic ion (ions which have covalent bonds).

Answer:

X is an element in period 3 with two electrons in the outer shell. Draw a full diagram of the ion form by this element

Answer:

Convection

Explanation:

Convection is steam and the condensation of vapor.

The concentration of the hydrogen ions from molarity can be given with the number of hydrogen atoms in the molecular formula.

Molarity is given as the moles of the solute present in a liters of solution. The compound with the number of hydrogen atoms in the molecular formula with degradation possesses the equivalent concentration of the hydrogen ions.

The compound with molecular formula AH having molarity 2, will produce 2M of hydrogen ions.

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Answer:

c. contraction

Explanation:

Heating will cause substances to expand, or change their state (like solid to liquid) or it may be a chemical reaction.

The weak base carbonate reacts with the water forming bicarbonate and the hydroxide ion.

The weak bases are given as the compounds that have the inability to get completely dissociated in water.

The carbonate is given as the weak base, as in water it remains constituted in the form of a bond with oxygen.

The reaction of water with the carbonate ion is given as:

[tex]\rm CO_3^{2-}\;+\;H_2O\;\rightleftharpoons HCO_3^-\;+\;OH^-[/tex]

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The speed of the wave increases as the frequency of the wave is increased from 0.1 Hz to 1.0 Hz.

The speed of a wave of a given wavelength is directly proportional to its frequency.

An increase in the frequency of a wave results in a proportional increase in the speed of the wave of the wavelength remains the same.

In the animation, as the frequency of the wave is increased from 0.1 Hz to 1.0 Hz, the speed of the wave is observed to increase as the time taken for the crests and troughs to move across the screen becomes smaller.

Therefore, the speed of the wave increases as the frequency of the wave is increased from 0.1 Hz to 1.0 Hz.

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Answer:

liquid

Explanation:

A solid is defined as substance with a set volume and form. A liquid is defined as substance with a set volume but no fixed form. A gas is substance that does not have a definite volume or shape. Plasma, like a gas, has no set volume or shape.

Alkanes contain the maximum possible amount of hydrogen, they are known as being saturated hydrocarbon.

The easiest category of hydrocarbons would be the alkanes. They exclusively possess hydrogen as well as carbon. So every hydrogen atom produces one link, while each carbon atom generates four.

When all of a hydrocarbon's carbon-carbon bonds possess single bonds, the hydrocarbon was said to have been saturated. A hydrocarbon would be an organic substance with only carbon as well as hydrogen as its components.

Therefore, alkanes contain the maximum possible amount of hydrogen, they are known as being saturated hydrocarbon.

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Answer:

heat increase,   pressue loss,  altitude gain,  

Explanation:

Answer:

rust

Explanation:

Chemical rxn of iron and oxygen = rust

Methane (CH4) with the smallest atomic size, would have the lowest boiling point.

It is the temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapour of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapour without raising the temperature.

CH₄, SiH₄, GeH₄, SnH₄ are very similar. They are all in the same group and their molecular geometry is a tetrahedral.

They have covalent bonds. The key difference: The number of protons and electrons.

These are non-polar molecules, so there are no ionic bonds. There are no H bonded to a F, N or O, so there is no hydrogen bonds.

Dipole induced dipole forces (AKA London dispersion forces) dictate the boiling points of these atoms. It is the attraction between atoms that dictate how easily they can disperse.

The electrons in an atom are constantly moving due to their repulsion of each other. However, if one electron has moved and the other has not, it is temporarily charged.

The biggest molecule will have the highest boiling point. The more protons and electrons, the stronger the effect.

Therefore, Methane (CH4) with the smallest atomic size, would have the lowest boiling point.

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The two liquids made a new substance.

A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity.

A chemical change occurs when some substances are transformed into different substances, with different nature and properties. In this case when both liquids are mixed a solid is formed.  This is an example of a change of state of the liquids reactants to the solid product, which has properties and characteristics different from that of the initial liquids of the mixture which is called a chemical change.

Hence, option D is correct.

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6.99 grams of iron (Fe) would produce 10 g of rust (Fe2O3) when iron combines with oxygen to form rust.

The mass of a substance can be calculated as follows:

According to this question, iron combines with oxygen to form rust as follows:

4Fe + 3O2 → 2Fe2O3

First, we convert the mass of rust to moles as follows:

moles of Fe2O3 = 10g/159.69 = 0.063moles

Next, convert moles of Fe to mass as follows:

mass of Fe = 0.125 × 55.85 = 6.99g

Therefore, 6.99 grams of iron (Fe) would produce 10 g of rust (Fe2O3) when iron combines with oxygen to form rust.

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The entropy change if one mole of water is warmed from 0 degree C to 100 degree C is 1,316.7 J/K.

Change in entropy will be measured by using the below equation as:

ΔS = (n)(Cp)ln(T₂/T₁), where

n = moles of water = 1 mol

Cp = specific heat of water = 4180 J/mol.K

T₂/T₁ = ratio of temperatures in K = 373 / 273 = 1.37 K

On putting values, we get

ΔS = (1)(4180)ln(1.37) = (4180)(0.315)

ΔS = 1,316.7 J/K

Hence required value of entropy is 1,316.7 J/K.

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Answer:

Iron - Nails, Utencils, Appliances

Copper - Wiring

Aluminiem - Roofing, Ducting

Answer: Exosphere

Explanation:

Answer:

exosphere

Explanation:

the outermost layer of earth's atmosphere is called exosphere

1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.

Mole is a very important unit of measurement that chemists use. A mole of something means you have 602,214,076,000,000,000,000,000 of that thing, like how having a dozen eggs means you have twelve eggs.

According to the reaction, 1 mole of nitrogen gas is produced by 2 moles of ammonia.

Then, 0.824 moles of nitrogen gas will be produced by:

1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.

Hence, 1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.

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Entropy Change is the measure of the randomness of the thermodynamic system. The entropy change for the reaction is -49.3 J/K.

Entropy change is the ratio of the heat transfer of the system to the absolute temperature of the system.

The entropy of nickel = 182.1 J/mol. K

The entropy of oxygen = 205.0 J/mol. K

The entropy of nickel oxide = 37.99 J/mol. K

Entropy change is calculated as:

[tex]\begin{aligned}\Delta \rm S &= 2(37.99)-2(182.1)-205\\\\&= 75.98 - 364.2 - 205\\\\&= -493.22 \end{aligned}[/tex]

Therefore, -49.3 J/K is the entropy change.

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Answer:

high I think

Explanation:

i just did it

Answer:

Bond forms to get stability. Stability will be maximum at low potential energy. So, in bond formation, atoms loose their potential energy to get stabilized and heat is evolved. Generally bond formation is also an exothermic reaction

Answer: Acceleration and velocity

Explanation:

Newton's second law says that when a constant force acts on a massive body, it causes it to accelerate, i.e., to change its velocity, at a constant rate. In the simplest case, a force applied to an object at rest causes it to accelerate in the direction of the force.

Answer:

Moving with changing velocity

Explanation:

the resultant force acting on it is not zero

hence