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Unit 1 Test Review
A theory is....
Which mass is the smallest?
Unit 1 Test Review
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Introduction to #chemistry
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Questions
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Answers
1
Which mass is the smallest?
1 gram
1 decigram
1 kilogram
1 nanogram
2
A theory is....
Your best guess
Meaningless in science
Something that cannot be changed
A well tested explanation
3
Only ________ can be separated by a chemical change.
Compounds
Elements
Substances
Mixtures
4
Solve: 111.1 + 22 = ?
130
113.1
100
133
5
A change in 1 degree Celsius is equal to how much change in Kelvin?
273
1
0
10
6
Which of the following is a homogeneous mixture?
salt water
chocolate chip cookie dough
air
cereal and milk
7
Which of the following is a mixture?
Oxygen
Silver
Water
Air
8
How many significant figures does the following number have: 150.0?
2
4
3
5
9
The _______ temperature scale has no below zero temperatures.
Kelvin
Celsius
None of the above
Fahrenheit
10
Write 5.1 x 10
2
out of scientific notation.
0.0051
51
510
0.51
11
What would a chemist most likely study?
A plant being eaten by an animal
A plant growing
Rain falling on a plant
A dead plant decomposing
12
The first letter in a chemical symbol is...
lowercase
underlined
bold
uppercase
13
Solve: 2.0 x 6 = ?
None of the above
10
12.0
12
14
Chemistry studies...
matter
the universe
the earth
living organisms
15
If the density of a cube is 0.92 g/mL, will it float or sink in water?
Float
Sink
16
What is the third step in the scientific method?
reflecting on results
making a hypothesis
design and test an experiment
making an observation
17
Mass is an...
Intensive property
Extensive property
18
Which number has four significant figures?
0.0040
0.0004
2045
7.80 x 10-4
19
When a chemical reaction occurs, it is also said to be a...
chemical change
no change
physical change
20
Write 502 in scientific notation.
50.2 x 101
5.02 x 10-2
50.2 x 10-1
5.02 x 102
21
What is the boiling point of water in Celsius?
273∘C
100∘C
373∘C
0∘C
22
What is the formula for density?
mass/volume
volume/mass
mass x volume
