How do you calculate enthalpy change of a reaction?

ΔH = ΔH products - ΔH reactants

d) Energy stored in the chemical bonds in a substance

a) Energy stored in the movement of molecules in a substance

c) The temperature of a molecule

What does the circle mean in ΔH°?

Standard Conditions (T=298.15 K P=1 atm)

Standard Temperature and Pressure (T=273.15 K P=1 atm)

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

Which represents a decrease in entropy?

condensation of steam on cold glass

Which of the following scenarios describes a process with a negative entropy change?

Osmosis (I hope you know your Biology!)

Which of these have a DECREASE in entropy?

CaCO 3 (s) → CaO(s) + CO 2 (g)

2NH 3 (g) → 3H 2 (g) + N 2 (g)

Which has a +ΔS (system) ?

C 2 H 2 O 2 (g) → 2CO(g) + H 2 (g)

AgNO 3 (aq) + NaCl(aq) → AgCl(s) + NaNO 3 (aq)

H 2 O(g) + CO 2 (g) → H 2 CO 3 (aq)

Systems in nature tend to undergo changes toward

higher energy and less disorder

higher energy and more disorder

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

It will be spontaneous at high temperatures.

It will be spontaneous at all temperatures.

It will be nonspontaneous at all temperatures.

It will be spontaneous at low temperatures.

What is a spontaneous process ?

process that does not need external intervention to occur / keep happening

process that needs an external intervention to occur

Spontaneity is determined by....

enthalpy, entropy, and temperature

ΔS will be positive for the reaction

BaF 2 (s) ->Ba 2+ (aq) + 2F - (aq)

2H 2 (g) + O 2 (g) -> 2H 2 O (g)

What is a spontaneous process ?

process that does not need external intervention to occur

process that needs an external intervention to occur.

AP Chemistry Spontaneity Entropy and Free Energy

10th Grade - University

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84 Qs

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AP Chemistry Spontaneity Entropy and Free Energy

Quiz

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10th Grade - University

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Practice Problem

•

Hard

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NGSS

HS-PS1-4, HS-PS3-4, HS-PS3-1

Standards-aligned

Charles Martinez

FREE Resource

84 questions

Show all answers

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Temperature is a measure of average [blank] energy of individual atoms.

heat

potential

mechanical

kinetic

Tags

NGSS.HS-PS3-2

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

ΔH value in an endothermic reaction is a positive number.

True

False

Tags

NGSS.HS-PS3-1

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which phase of matter has the greatest motion and least orderly arrangement?

solid

liquid

gas

Tags

NGSS.HS-PS3-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A catalyst works by

changing the order of the reaction

increasing the temperature

lowering the activation energy

making the activated complex

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What type of reaction is shown in the reaction pathway?

endothermic reaction

exothermic reaction

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

_?_ is the amount of energy required to raise the temperature of 1 gram of any substance 1^oC.

Specific heat

A calorie

Thermal energy

Conduction

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The diagram represents which type of reaction

endothermic

exothermic

Tags

NGSS.HS-PS1-4

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AP Chemistry Spontaneity Entropy and Free Energy

84 questions

Temperature is a measure of average [blank] energy of individual atoms.

ΔH value in an endothermic reaction is a positive number.

Which phase of matter has the greatest motion and least orderly arrangement?

A catalyst works by

What type of reaction is shown in the reaction pathway?

_?_ is the amount of energy required to raise the temperature of 1 gram of any substance 1^oC.

The diagram represents which type of reaction

How do you calculate enthalpy change of a reaction?

Define 'Enthalpy'

Heat is measured in

Create a free account and access millions of resources

Similar Resources on Wayground

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Discover more resources for Chemistry

AP Chemistry Spontaneity Entropy and Free Energy

84 questions

Temperature is a measure of average [blank] energy of individual atoms.

ΔH value in an endothermic reaction is a positive number.

Which phase of matter has the greatest motion and least orderly arrangement?

A catalyst works by

What type of reaction is shown in the reaction pathway?

_?_ is the amount of energy required to raise the temperature of 1 gram of any substance 1oC.

The diagram represents which type of reaction

How do you calculate enthalpy change of a reaction?

Define 'Enthalpy'

Heat is measured in

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

_?_ is the amount of energy required to raise the temperature of 1 gram of any substance 1^oC.