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Chapter 4.2 Review (7th)
Test Description: Compounds
Instructions: Answer all questions to get your test result.
1) A pure substance composed of two or more elements that are chemically combined
A
elements
B
compound
C
mixture
D
solution
2) A poisonous, greenish yellow gas
A
sodium chlorate
B
sodium
C
methane
D
chlorine
3) When two or more elements join together chemically
A
a mixture is formed.
B
the physical properties of the substances remain the same.
C
a compound is formed.
D
a substance that is the same as the elements is formed.
4) The elements in a compound
A
All of the above
B
can be separated by chemical changes.
C
join in a specific ratio according to their masses.
D
combine by reacting with one another.
5) Which of the following will NOT break down compounds?
A
a chemical change
B
heat
C
filtering
D
electric current
6) How do elements join to form compounds?
A
in a ratio of 1 to 8
B
randomly
C
in a specific ratio
D
as the scientist plans it
7) Which of the following statements is true about the properties of compounds?
A
A property of all compounds is to react with acid.
B
Each compound has its own physical properties.
C
A compound has the same properties as the elements that form it.
D
Compounds cannot be identified by their chemical properties.
8) Compounds cannot be broken down by any mean
A
true
B
false
9) compounds can be broken down only by chemical changes
A
true
B
false
10) heating can break down some compounds
A
true
B
false
*select an answer for all questions
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