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REVIEW J.U3L1-Chemical Reactions
Test Description: Quiz prep AFTER doing the Explorations
Instructions: Answer all questions to get your test result.
1) Which laboratory EVIDENCE is not an indicator of a chemical reaction?
A
change in color
B
change in volume
C
energy released as heat or light
D
change in odor
2) Which real-life process does indicate a chemical reaction is taking place?
A
chopping weeds
B
drying clothes in the dryer
C
heating a cup of tea
D
cooking an eggplant
3) Which property could be used to identify a specific substance?
A
weight
B
volume
C
mass
D
density
4) To separate a mixture, Austin uses a magnet, boiling water, and a filter. Which statement is true about his process?
A
Austin uses only physical changes to separate the mixture’s components.
B
Austin uses neither physical nor chemical changes to separate the mixture’s components.
C
Austin uses both physical and chemical changes to separate the mixture’s components.
D
Austin uses only chemical changes to separate the mixture’s components.
5) A precipitate is a SOLID produced in a chemical reaction. T or F?
A
precipitates don't occur in the lab
B
precipitates don't exist in nature
C
FALSE
D
TRUE
6) Which statement indicates that a chemical reaction has taken place?
A
A puddle is produced by melting ice
B
A loud noise is produced by crushing a water bottle
C
A shard of glass is produced by breaking a bottle
D
An odor is produced by burning maple syrup
7) What is your REASONING for what occurs in a chemical reaction?
A
The atoms in the products were regrouped into different molecules to form the reactants.
B
The atoms in the products were destroyed and new molecules appeared to form the reactants.
C
The atoms in the reactants were regrouped into different molecules to form the products.
D
The atoms in the reactants were destroyed and new molecules appeared to form the products.
8) Flammability and reactivity are examples of physical properties. T or F?
A
TRUE
B
flammability can be dangerous around flames
C
FALSE
D
flammability means it can catch fire
9) A student observed a precipitate form during a chemical reaction. What is her CLAIM?
A
The color of a liquid changed when a solid was added to it.
B
Bubbles of gas floated to the top of a solution.
C
Steam rose from a flask when a powder was added to a liquid.
D
A solid sank to the bottom of a container when two liquids were mixed.
10) Chemical properties define how a substance CHANGES into different substances. T or F?
A
substances cannot change
B
FALSE
C
chemicals cannot change
D
TRUE
*select an answer for all questions
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