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15.3

Authored by Heidi Coker

Chemistry

9th - 12th Grade

Used 4+ times

15.3
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8 questions

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1.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Media Image

Entropy increases from solid, liquid to gas. Why?

Molecular disorder increases
Molecular randomness decreases
Molecules are more energetic
Molecules are more reactive

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which sample has the lowest entropy?

HINT - Look at the phase of each chemical....

1 mole of KNO3(l)

1 mole of KNO3(s)

1 mole of H2O(l)

1 mole of H2O(g)

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What phase of matter has the most entropy?

solid

liquid

gas

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What information do we need to perform a calculation of Gibbs Free Energy?

Enthalpy of the reaction.

Entropy of the reaction.

The temperature of the reaction in Kelvin.

All of the above are needed.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A reaction has a positive ΔH and a positive ΔS. Which of the following is true?

It will be spontaneous at all temperatures.
It will be nonspontaneous at all temperatures.
It will be spontaneous at low temperatures.
It will be spontaneous at high temperatures.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is the most thermodynamically favorable?

negative enthalpy and negative entropy

negative enthalpy and positive entropy

positive enthalpy and negative entropy

positive enthalpy and positive entropy

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which combination of ΔH and ΔS NEVER has a spontaneous reaction?

+ΔH and +ΔS

+ΔH and -ΔS

-ΔH and -ΔS

-ΔH and +ΔS

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