Chapter 4.2 Review (7th) Question Preview (ID: 33796)
Compounds.
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A pure substance composed of two or more elements that are chemically combined
a) elements
b) compound
c) mixture
d) solution
A poisonous, greenish yellow gas
a) chlorine
b) sodium
c) sodium chlorate
d) methane
When two or more elements join together chemically
a) a compound is formed.
b) a mixture is formed.
c) a substance that is the same as the elements is formed.
d) the physical properties of the substances remain the same.
The elements in a compound
a) join in a specific ratio according to their masses.
b) combine by reacting with one another.
c) can be separated by chemical changes.
d) All of the above
Which of the following will NOT break down compounds?
a) heat
b) electric current
c) a chemical change
d) filtering
How do elements join to form compounds?
a) randomly
b) in a specific ratio
c) in a ratio of 1 to 8
d) as the scientist plans it
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) Compounds cannot be identified by their chemical properties.
d) A compound has the same properties as the elements that form it.
Compounds cannot be broken down by any mean
a) true
b) false
c)
d)
compounds can be broken down only by chemical changes
a) true
b) false
c)
d)
heating can break down some compounds
a) true
b) false
c)
d)
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