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Understanding Thermal Energy in Chemical Reactions
Passage
•
Science
•
7th Grade
•
Practice Problem
•
Medium
Caroline G Scharenberg
Used 4+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following statements regarding bond energies is FALSE?
Some chemical bonds are easier to break than others.
All chemical bonds are hard to break.
Bond energy is the amount of energy it takes to break a chemical bond.
Every chemical bond has its own unique bond energy.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What specifically determines how much energy is available in a molecule?
The number and types of bonds within the molecule
Whether the molecule is a reactant or a product
The number of atoms in the molecule
Whether the molecule is hard or soft
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do scientists determine whether a chemical reaction releases or stores energy?
Scientists compare the total bond energies of the reactants and the products.
All of the above
Scientists know that each chemical has its own unique bond energy.
Scientists can calculate the bond energies of the reactants and the products.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What type of chemical reaction occurs when more energy is released during the chemical reaction than is needed to start the chemical reaction?
A simple chemical reaction
An endothermic reaction
A bond energy reaction
An exothermic reaction
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What type of chemical reaction occurs when less energy is released during the chemical reaction than is needed to start the chemical reaction?
A bond energy reaction
An exothermic reaction
An endothermic reaction
A simple chemical reaction
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Some chemical reactions release energy. Others store energy. What important chemical reaction stores energy?
Digestion
Photosynthesis
Combustion reactions
The burning of fossil fuels
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the term for the starting chemicals in a chemical reaction?
Reactants
Products
Molecules
Bond energy
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