Enthalpy and Energy Changes in Reactions

Enthalpy and Energy Changes in Reactions

Assessment

Interactive Video

Chemistry

10th - 12th Grade

Hard

Created by

Patricia Brown

FREE Resource

The video tutorial explains how to communicate energy changes in chemical reactions using enthalpy graphs. It covers exothermic reactions, like butane combustion, which release energy, and endothermic reactions, like ethane cracking, which absorb energy. The tutorial emphasizes the importance of understanding these graphs to interpret chemical potential energy changes and reaction dynamics.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary focus of the enthalpy graph discussed in the introduction?

Energy absorption in photosynthesis

Formation of water vapor

Exothermic reaction of butane combustion

Endothermic reaction of ethane cracking

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In an exothermic reaction, how does the potential energy of reactants compare to that of products?

Products have more potential energy

Reactants have less potential energy

Reactants and products have equal potential energy

Reactants have more potential energy

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the enthalpy change for the combustion of butane?

Negative 136.4 kilojoules

Positive 136.4 kilojoules

Negative 2.87 megajoules

Positive 2.87 megajoules

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What characterizes an endothermic reaction in terms of enthalpy?

Negative enthalpy value

No change in enthalpy

Positive enthalpy value

Zero enthalpy value

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to ethane during the cracking process?

It releases energy

It remains unchanged

It absorbs energy

It forms water

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do exothermic and endothermic reactions differ in terms of energy flow?

Exothermic reactions release energy, endothermic reactions absorb energy

Both absorb energy

Exothermic reactions absorb energy, endothermic reactions release energy

Both release energy

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a key feature of an exothermic graph?

It remains flat

It steps up

It forms a loop

It steps down

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