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7F CC Amnesty Day

7F CC Amnesty Day

Assessment

Quiz

Chemistry

10th Grade

Hard

Created by

Christina Hicks

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7 questions

Show all answers

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

The entropy will usually increase when

a molecule is broken into two or more smaller molecules

a reaction occurs that results in an increase in the number of moles of gas

a solid changes to a liquid

all of these

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the reactions below has a negative ∆S?

CuCO3 (s) + 2HCl (aq) → CuCl2 (aq) + CO2 (g) + H2O (l)

C (s) + O2 (g) → CO2 (g)

CuO (s) + H2SO4 (aq) → CuSO4 (aq) + H2O (l)

BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaCl (aq)

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following would most likely lead to a spontaneous reaction.

A high negative enthalpy.

A low negative enthalpy.

A high positive enthalpy.

A low positive enthalpy.

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 combination of ΔH and ΔS NEVER has a spontaneous reaction?

+ΔH and +ΔS

+ΔH and -ΔS

-ΔH and -ΔS

-ΔH and +ΔS

7.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

6. The formation ½ A2 + 2 B2 + C --> CAB4 has an enthalpy of formation of -104 kJ and a change in entropy of -60.8 J/K at 30 °C. What is the free energy and spontaneity of the reaction?

-85.6 kJ, spontaneous

-18.3 kJ, not spontaneous

+18.3 kJ, spontaneous

+85.6 kJ, not spontaneous

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