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Copy of Skill Check #1.2 (Unit 1 Investigation 1 Experience 2) (7/30/2025)
By Didi Maloney
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Last updated 7 months ago
5 questions
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Question 1
1.
If the chemical reaction AB + CD → AD + BC releases heat, what is true of the stored energy of the reactants and products?
The energy of the reactants is the same as the energy of the products.
The energy of the reactants is higher than the energy of the products.
The energy of the reactants is lower than the energy of the products.
The bonds do not have energy; the atoms release heat.
Question 2
2.
How do endothermic reactions impact the overall kinetic energy of the molecules?
Select all that apply.
Energy is absorbed during an endothermic reaction.
An endothermic reaction reduces the overall kinetic energy of the molecules.
An endothermic reaction increases the overall kinetic energy of the molecules.
Energy is released during an endothermic reaction.
Question 3
3.
Use the diagram to answer the questions. The diagram describes the changes to matter and energy as wood burns in a campfire.
Consider the scenario in which you are sitting by the campfire on a cold night. Which description best summarizes the heat transfer that occurs?
The burning of the wood
absorbs
energy from its surroundings. Heat is transferred from your body to the campfire.
Heat does not flow between the campfire and your body, as thermal equilibrium already has been achieved.
The burning of the wood
releases
energy to its surroundings. Heat is transferred from the campfire to your body.
The burning of the wood
releases
energy to its surroundings. Heat is transferred from your body to the campfire.
Question 4
4.
Use the diagram to answer the questions. The diagram describes the changes to matter and energy as wood burns in a campfire.
Choose the words to complete the sentences.
As wood burns, it undergoes a ___________ change. The ___________ produced by this change are forms of energy.
physical, heat and light
physical, carbon dioxide and water
chemical, heat and light
chemical, carbon dioxide and water
Question 5
5.
Use the diagram to answer the questions. The diagram describes the changes to matter and energy as wood burns in a campfire.
Wood is made mostly of cellulose and has a chemical formula of C
6
H
10
O
5
. The chemical equation for this combustion reaction is:
C
6
H
10
O
5
(s) + 6O
2
(g) ---> 6CO
2
(g) + 5H
2
0 (g) + energy
What type of reaction occurred?
Exothermic
Endothermic
Non-energetic
Neutralization