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Thermochemical Equations and Enthalpy

Thermochemical Equations and Enthalpy

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Practice Problem

Hard

Created by

Patricia Brown

FREE Resource

The video tutorial covers the basics of thermochemistry, focusing on thermochemical equations and enthalpy. It explains the concept of enthalpy as a state function and discusses energy conservation in chemical reactions. The tutorial differentiates between endothermic and exothermic processes, emphasizing the importance of sign conventions for Delta H. It introduces thermochemical equations, explaining how to manipulate them by scaling and reversing reactions. A practice problem is solved using stoichiometry to reinforce the concepts discussed.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What tools are necessary to follow along with the session on thermochemical equations?

A textbook and a notebook

A periodic table and a calculator

A lab coat and safety goggles

A computer and internet access

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does it mean for enthalpy to be a state function?

It depends on the path taken to reach a state

It is independent of the path taken to reach a state

It is only relevant in closed systems

It varies with temperature

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In thermochemistry, what does a positive Delta H indicate?

The system is at equilibrium

The system is losing energy

The process is exothermic

The process is endothermic

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to the sign of Delta H when a thermochemical equation is reversed?

It doubles

It changes sign

It becomes zero

It remains the same

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a thermochemical equation, what must be done if the coefficients of the reactants and products are multiplied by a factor?

The Delta H value must be multiplied by the same factor

The Delta H value must be divided by the same factor

The Delta H value must be added to the initial value

The Delta H value remains unchanged

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the role of energy in an exothermic reaction?

Energy is released to the surroundings

Energy is converted into mass

Energy remains constant

Energy is absorbed by the system

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is energy treated in a thermochemical equation for an exothermic reaction?

As a reactant

As a product

As a catalyst

As a solvent

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