Chapter 4.2: Question Preview (ID: 11314)

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Which of the following is NOT true about compounds?
a) Compounds join in specific ratios according to their masses.
b) The mass ratio of a specific compound is always the same.
c) Compounds are random combinations of elements.
d) Different mass ratios mean different compounds.

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.

The only way to break down a compound is through a(n)
a) physical change
b) chemical change

What compound is used by plants in photosynthesis to make carbohydrates?
a) nitrogen
b) ammonia
c) hydrogen
d) carbon dioxide

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

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 physical properties of compounds do NOT include
a) melting point
b) density
c) reaction to light
d) color

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 mass ratio
c) in a ratio of 1 to 8
d) as the scientist plans it

What compound helps give carbonated beverages their “fizz”?
a) carbonic acid
b) carbon
c) oxygen
d) hydrogen

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