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Copy of CI 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
6 questions
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Question 1
1.
In the chemical reaction AB + CD → AD + BC heat is absorbed what is true of the stored energy of the reactants and products?
The bonds do not have energy; the atoms release heat.
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.
Question 2
2.
How do exothermic reactions impact the overall potential energy of the molecules?
Select all that apply.
An exothermic reaction increases the overall potential energy of the product molecules.
Energy is released during an exothermic reaction.
An exothermic reaction reduces the overall potential energy of the product molecules.
Energy is absorbed during an exothermic 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
releases
energy to 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.
Question 4
4.
Non-energetic
Exothermic
Neutralization
Endothermic
Question 5
5.
Describe how heat flows when an ice cube is placed in the palm of your hand.
Question 6
6.
Describe what it means by thermal equilibrium.
The burning of the wood
absorbs
energy from its surroundings. Heat is transferred from your body to the campfire.
The burning of the wood
releases
energy to its surroundings. Heat is transferred from the campfire to your body.
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?