07.00 Energy in Reactions

07.00 Energy in Reactions

Assessment

Quiz

Chemistry

10th - 12th Grade

Hard

Created by

Emma Barrett

Used 15+ times

FREE Resource

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22 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which statement is true about the potential energy diagram for an exothermic reaction?

Energy value remains the same throughout the diagram.

Products have more potential energy than reactants.

Potential energy of the products is equal to the potential energy of the reactants.

It starts at a higher energy value and ends at a lower energy value.

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

The graph shows the potential energy diagram for an unknown chemical change.Which chemical change could the graph represent? (1 point)

Adding heat to decompose calcium carbonate

Photosynthesis in plants

Combustion of iron

Electrolysis of water

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is a characteristic of an endothermic chemical reaction? (1 point)

The energy of the reactants is higher than the energy of the products.

The amount of energy released is equal to the activation energy.

Energy is released into the surroundings during this change.

The overall enthalpy of the system increases during the change.

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Four substances at the same temperature absorb equal amounts of energy. The specific heats of the four substances are 1.01 J/g °C, 1.01 J/g °C, 0.38 J/g °C, and 0.44 J/g °C. What is the specific heat value of the substance that will have highest increase in temperature? (1 point)

0.84 J/g °C

1.01 J/g °C

0.38 J/g °C

0.44 J/g °C

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How many joules are absorbed when 64.3 grams of water is heated from 40.0 °C to 74.0 °C? (1 point)

7,330 joules

9,150 joules

10,100 joules

12,800 joules

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

During a reaction, ΔH for reactants is −750 kJ/mol and ΔH for products is 920 kJ/mol. Which statement is correct about the reaction? (1 point)

It is endothermic because the energy required to break bonds in the reactants is less than the energy released when the products are formed.

It is endothermic because the energy required to break bonds in the reactants is greater than the energy released when the products are formed.

It is exothermic because the energy required to break bonds in the reactants is less than the energy released when the products are formed.

It is exothermic because the energy required to break bonds in the reactants is greater than the energy released when the products are formed.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which statement is correct about the rate of a chemical reaction? (1 point)

It increases when the concentration of reactants increases.

It does not depend on the concentration of reactants.

It increases when the temperature decreases.

It does not depend on the temperature.

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