CHEMISTRY HIGH SCHOOL

Which of these changes produces the greatestincrease in entropy?
(1) CaCO3(s) --> CaO(s) + CO2(g)
(2) 2 Mg(s) + O2(g) --> 2 MgO(s)
(3) H2O(g) --> H2O(l)
(4) CO2(g) --> CO2(s)

Answers

Answer 1
Answer:

Answer:

Was this correct? I am pretty sure it is since you are going from a solid to a gas in the first reaction.

Explanation:

(1) CaCO3(s) --> CaO(s) + CO2(g) --- solid to solid & gas ** most entropy here

(2) 2 Mg(s) + O2(g) --> 2 MgO(s) solid & gas to a solid

(3) H2O(g) --> H2O(l) gas to a liquid

(4) CO2(g) --> CO2(s)   gas to a solid
Answer 2
Answer:

As temperature rises and a substance transforms from a solid to a liquid to a gas, entropy increases. Because they have the most flexibility to move, gases have the highest entropy values. Here the first reaction has high entropy. The correct option is 1.

The level of unpredictability in a system is known as entropy. The degree of randomness is highest when comparing the three forms of matter solid, liquid, and gas because the gas particles move freely.

(1) CaCO3(s) --> CaO(s) + CO2(g) --- solid to solid & gas - most entropy here

(2) 2 Mg(s) + O2(g) --> 2 MgO(s) solid & gas to a solid

(3) H2O(g) --> H2O(l) gas to a liquid

(4) CO2(g) --> CO2(s)   gas to a solid

Thus the correct option is 1.

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Answers

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Final answer:

To round off the measurement 3255 mL to three significant digits, the correct answer is (c) 3250 mL.

Explanation:

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Which of the answer choices accurately describes a trend that occurs when moving left to right across periods?(Select all that apply.)

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Answers

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water is mixed with solid calcium nitrate in a beaker. write balanced net ionic equation for the reaction

Answers

When calcium nitrate is added or mixed with water, the substance would dissociate into its corresponding ions which are calcium and nitrate ions. The ionic equation would be:

Ca(NO3)2 = Ca2+ + NO3-

Hope this answers the question. Have a nice day. Feel free to ask more questions.

Answer : The net ionic equation will be,

Ca^(2+)(aq)+2OH^(-)(aq)\rightarrow Ca(OH)_2(s)

Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

The balanced ionic equation will be,

2H_2O(aq)+Ca(NO_3)_2(aq)\rightarrow 2HNO_3(aq)+Ca(OH)_2(s)

The ionic equation in separated aqueous solution will be,

4H^+(aq)+2OH^(-)(aq)+Ca^(2+)(aq)+2NO_3^(-)(aq)\rightarrow Ca(OH)_2(s)+2H^+(aq)+2NO_3^(-)(aq)

In this equation, H^+\text{ and }NO_3^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

Ca^(2+)(aq)+2OH^(-)(aq)\rightarrow Ca(OH)_2(s)
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