What is the main characteristic of an exothermic reaction?

Endothermic and Exothermic Reactions

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Chemistry, Physics, Science
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9th - 10th Grade
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Hard

Patricia Brown
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Heat is absorbed from the surroundings.
Heat is released to the surroundings.
The reaction requires light to proceed.
The reaction occurs only at high temperatures.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is an example of an exothermic reaction?
Photosynthesis
Evaporation of water
Combustion of natural gas
Melting of ice
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In an exothermic reaction, what happens to the enthalpy of the system?
It remains constant.
It becomes zero.
It decreases.
It increases.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does a negative delta H indicate in a chemical reaction?
The reaction is non-spontaneous.
The reaction is at equilibrium.
The reaction is exothermic.
The reaction is endothermic.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is heat represented in a thermal equation for an exothermic reaction?
As a solvent
As a reactant
As a catalyst
As a product
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main characteristic of an endothermic reaction?
The reaction requires a catalyst.
Heat is absorbed from the surroundings.
The reaction occurs only in the dark.
Heat is released to the surroundings.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following processes is endothermic?
Condensation of steam
Freezing of water
Combustion of wood
Melting of ice
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