AP Chemistry Spontaneity, Entropy, and Free Energy

AP Chemistry Spontaneity, Entropy, and Free Energy

12th Grade

10 Qs

quiz-placeholder

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AP Chemistry Spontaneity, Entropy, and Free Energy

AP Chemistry Spontaneity, Entropy, and Free Energy

Assessment

Quiz

Chemistry

12th Grade

Medium

NGSS
HS-PS1-4, HS-PS1-6, HS-PS1-5

+1

Standards-aligned

Created by

Amanda Bednar

Used 170+ times

FREE Resource

10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The thermodynamic quantity that expresses the degree of disorder in a system is _

entropy

internal energy

heat flow

enthalpy

bond energy

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which one of the following is always positive when a spontaneous process occurs?

ΔH univ

ΔH surr

ΔS surr

ΔS univ

ΔS sys

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

ΔS will be positive for the reaction

2H2 (g) + O2 (g) -> 2H2O (g)

2NO2 (g) -> N2O4 (g)

BaF2 (s) ->Ba2+ (aq) + 2F- (aq)

2Hg (l) + O2 (g) ->2HgO (s)

Tags

NGSS.HS-PS1-4

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which one of the following processes produces a decrease in the entropy of the system?

dissolution of solid KCl in water

mixing of two gases into one container

freezing water to form ice

melting ice to form water

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Of the following, the entropy of gaseous __________ is the largest at 25eC and 1 atm.

C2H2

H2

C2H6

CH4

C2H

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What can be said about a chemical system that has reached a minimum in free energy?

The system has achieved equilibrium.

The reaction is complete.

The system entropy is zero.

The reaction is very fast.

Tags

NGSS.HS-PS1-6

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

For the reaction C2H6 (g) ->C2H4 (g) + H2 (g) ΔHο is +137 kJ/mol and ΔDSοis +120 J/K œ mol. This reaction is

nonspontaneous at all temperatures

unreliable

spontaneous only at high temperature

spontaneous at all temperatures

spontaneous only at low temperature

Tags

NGSS.HS-PS1-4

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