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WorksheetsLab Quiz: Evidence of a chemical reaction
Total questions: 10
Worksheet time: 12mins
Name
Class
Date
1.
Copper nitrate is
a)
clear
b)
blue
c)
cream color
2.
You first mixed the copper nitrate with sodium hydroxide in the test tube. You then observed
a)
nothing
b)
a clear solution
c)
a precipitate
3.
Provides evidence that a chemical reaction has occurred.
a)
dissolving
b)
melting
c)
formation of a gas
d)
bending
4.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
5.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
d)
The mass of the combined liquids is greater than either original liquid.
6.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid.
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
7.
Which of these is NOT a sign that a chemical change has occurred?
a)
A loss of transparency
b)
An unexpected color change
c)
A temperature change
d)
The formation of a precipitate
8.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
9.
Which of the following IS a physical change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
10.
What are the elements or compounds that form following a chemical reaction called?
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
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