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8th Grade Chemistry Review
Test Description: Review for the unit test
Instructions: Answer all questions to get your test result.
1) The label on a container of a drain cleaner says: Harmful or fatal if swallowed. Causes severe irritation to eyes, skin, mouth and clothing. Which type of hazard does the drain cleaner pose?
A
It is flammable
B
It is toxic
C
It is not hazardous
D
It is radioactive
2) The compound sucrose has a chemical formula of C12H22O11. How many elements are in one molecule of sucrose?
A
45
B
22
C
12
D
3
3) Which of the following is a compound?
A
N
B
Ca
C
Na
D
CO
4) Mineral oil is less dense than water. Mercury, a liquid metal, is more dense than water. If mineral oil, mercury, and water are mixed together, which liquid would float to the top?
A
Mineral Oil
B
Mercury
C
Bath Mercury and Mineral Oil
D
Water
5) A student pours two different solutions into a glass beaker. Which of the following would indicate that a chemical reaction took place between the two solutions
A
A change in color of a solution
B
The formation of a precipitate
C
All of the above
D
A change in the temperature
6) While working on an activity to investigate chemical reactions, a student mixes two clear liquids in a beaker. When the two liquids mix, the result is a clear liquid and an orange precipitate. Which best describes the reactants that students worked w
A
The orange solid precipiate
B
All of the above
C
The resulting clear liquid
D
The initial two clear liquids
7) Which of the following statements about dilution as an approach to handling toxic waste is TRUE?
A
None of the above
B
Dilution lowers the concentration of toxic materials in waste
C
Dilution removes the toxic materials in liquid wastes
D
Dilution a liquid until it clear means that the liquid is safe
8) Which one of the following tests could help you narrow down the identity of a substance?
A
Placing in water
B
Carefully smelling
C
Holding a magnet near
D
Observing if a solid
9) Why is ammonia used to test for copper in a solution? Choose the best answer.
A
All chemical tests are superior to our senses
B
The odor of ammonia is easily detected by most
C
Ammonia can detect smaller amounts of copper than the eye
D
Different people see colors differently
10) Which of the following is a chemical property of substances? the substances
A
Conducts electricity
B
Reacts with hydrochloric acid
C
Is denser than water
D
Scratches glass
11) Which of the following is a list of physical properties?
A
Electrical conductivity, hardness, ability to transmit light
B
Flexibility, Reaction with hydrochloric acid, color
C
Temperature change when a chemical is added, texture, density
D
Density, Conductivity, Reaction with acid
*select an answer for all questions
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