Chemical Changes Review
Authored by Hannah McCullough
Chemistry, Science
7th - 8th Grade
Used 9+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a sign of a chemical reaction?
Changes size
Turns from a square to a circle
Precipitate forms
It is soluble
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The substances we start out with in a chemical reaction are called what?
Products
Reactants
Law of Conservation of Mass
Energy
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A bonfire is an example of what type of reaction?
Exothermic
Endothermic
Radioactive
Conservation Energy
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In an endothermic reaction, what happens to the temperature?
Increases
Decreases
Stays the same
5.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
In the following chemical equation, which substances are the products? Select all that apply.
Zn + 2HCl ---> ZnCl2 + H2
Zn
2HCl
ZnCl2
H2
6.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
What happens to the number of atoms in a chemical reaction?
Stays the same
Increases
Decreases
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What scientific law states that matter cannot be created nor destroyed?
Law of Conservation of Atoms
Law of Conservation of Mass
Law of Physics
There isn't one. Matter can be created.
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