Chemical Reactions
Authored by Margaret Blauert
Science
7th Grade
7-PS1-2 covered
Used 134+ times
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12 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A student performs an experiment, and the results are shown below:
Before: white baking soda and clear vinegar are separated
After: the baking soda and vinegar are mixed together forming gas bubbles
Which statement supports that a chemical change took place?
A new substance was formed.
Changes in color occurred.
The original substances were present after the reaction.
A physical change in the baking soda occurred.
Tags
7-PS1-2
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A chemical reaction is shown below:
Fe₂O₃ + H₂S --> FeO + S + H₂O
What does the arrow (-->) in this chemical reaction represent?
coefficient
subscript
products
yields
Tags
7-PS1-2
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is a solution created?
mixing 2 solids together
evenly dissolving 1 substance in another
mixing 2 substances together that stay separated
creating a chemical change between 2 substances
Tags
7-PS1-2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is NOT an example of a solution?
lemonade
coffee
water
kool-aid
Tags
7-PS1-2
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When nitrogen gas (N₂) reacts with hydrogen gas (H₂), it forms a new substance called ammonia (NH₃). When iron (Fe) is added to the reaction, the rate of the reaction speeds up. What is the catalyst in this reaction?
H₂
NH₃
Fe
N₂
Tags
7-PS1-2
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the number written below the element that represents the number of atoms?
subscript
formula
element
coefficient
Tags
7-PS1-2
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When oxygen and iron combine together in a moist environment (environment with water), rust forms because of a...
physical reaction
change in density
chemical reaction
change in temperature
Tags
7-PS1-2
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