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Enthalpy Concepts and Properties

Enthalpy Concepts and Properties

Assessment

Interactive Video

Chemistry, Physics, Science

9th - 10th Grade

Practice Problem

Hard

Created by

Patricia Brown

FREE Resource

The video tutorial explains the concept of enthalpy, its origin, and its definition as the total heat content of a substance. It discusses the relationship between enthalpy and internal energy, and how enthalpy change is measured. The tutorial also covers the role of enthalpy in chemical reactions, explaining how strong and weak bonds affect enthalpy levels. Enthalpy diagrams are introduced to illustrate endothermic and exothermic reactions. Finally, the properties of enthalpy change, including its nature as a state function and extensive property, are discussed.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the origin of the term 'enthalpy'?

It comes from the Latin word for heat.

It is derived from a Greek word meaning 'in heat'.

It is a modern term with no historical origin.

It was coined by a French scientist in 1909.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is enthalpy defined in terms of internal energy and pressure-volume product?

H = U / (P * V)

H = U * P / V

H = U + P * V

H = U - P * V

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why can't the total enthalpy of a system be measured directly?

Because it requires high temperatures.

Because the absolute value of internal energy is indeterminable.

Because it depends on the chemical composition.

Because it changes too rapidly.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does a positive delta H indicate in a chemical reaction?

The reaction is at equilibrium.

The reaction is exothermic.

The reaction releases energy.

The reaction absorbs heat from the surroundings.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When are molecules considered to have low enthalpy?

When they have weak bonds.

When they are unstable.

When they have strong bonds.

When they are in a gaseous state.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does an enthalpy diagram represent?

The speed of a reaction.

The volume changes in a system.

The change in enthalpy during a process.

The pressure changes in a system.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does a negative delta H signify in a reaction?

The reaction is at equilibrium.

The reaction absorbs heat.

The reaction is endothermic.

The reaction releases heat to the surroundings.

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