Enthalpy Changes and Reaction Types

Enthalpy Changes and Reaction Types

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Practice Problem

Hard

Created by

Patricia Brown

FREE Resource

The video tutorial explains how to interpret a potential energy profile graph for chemical reactions. It covers calculating the potential energy of reactants and products, determining the enthalpy change for forward and backward reactions, and understanding energy absorption and release. The tutorial also distinguishes between endothermic and exothermic reactions based on enthalpy changes.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the y-axis represent in the potential energy profile graph?

Temperature in Celsius

Time in seconds

Potential energy in kilojoules per mole

Reaction progress

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you determine the potential energy of reactants from the graph?

By finding the midpoint of the graph

By calculating the slope of the graph

By reading the y-axis at the reactants

By measuring the x-axis at the start

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the enthalpy change for a forward reaction if the reactants have 30 KJ/mol and the products have 5 KJ/mol?

-25 KJ/mol

25 KJ/mol

-5 KJ/mol

5 KJ/mol

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does a negative enthalpy change indicate about a reaction?

The reaction is at equilibrium

Energy is absorbed

Energy is released

The reaction is endothermic

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If a reaction releases energy, what type of reaction is it?

Adiabatic

Endothermic

Isothermal

Exothermic

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the backward reaction example, what is the potential energy of the reactants?

30 KJ/mol

40 KJ/mol

50 KJ/mol

20 KJ/mol

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is the enthalpy change calculated for a backward reaction?

Divide initial energy by final energy

Add initial and final energies

Multiply initial energy by final energy

Subtract initial energy from final energy

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