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Compounds — Quiz Answers

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How many atoms of oxygen in the chemical formula 2 Ca open paren ClO sub 2 close paren sub 2 ?

A
6
B
4
C
8
D
2
2
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Which of these is a compound?

A
CO sub 2
B
cap o sub 2
C
cap o
D
Co
3

How many atoms of each element are in 4 Na sub 3 PO sub 4 ?

A
3 sodium, 1 phosphorus, 4 oxygen
B
4 sodium, 4 phosphorus, 4 oxygen
C
12 sodium, 4 phosphorus, 16 oxygen
D
12 sodium, 1 phosphorus, 4 oxygen
4

The compound magnesium phosphate has the chemical formula Mg sub 3 open paren PO sub 4 close paren sub 2 In this compound, phosphorous and oxygen act together as one charged particle, which is connected to magnesium, the other charged particle. What does the 2 mean in the formula 5 Mg sub 3 open paren PO sub 4 close paren sub 2 ?

A
There are two molecules of magnesium phosphate.
B
There are two phosphate ions in a molecule of magnesium phosphate.
C
There are two elements in magnesium phosphate.
D
There are two magnesium ions in a molecule of magnesium phosphate.
5

How many atoms of each element are in the chemical formula cap p sub 2 cap o sub 5 ?

A
5 phosphorus and 2 oxygen
B
2 phosphorus and 1 oxygen
C
2 phosphorus and 5 oxygen
D
1 phosphorus and 5 oxygen
6

Which is the best description of a molecule?

A
A molecule of an element is composed of exactly two types of atoms.
B
A molecule of a compound is composed of at least two atoms.
C
A molecule of an element is composed of at least two types of atoms.
D
A molecule of a compound is composed of only one atom.
7

Which statement correctly describes why a compound is a pure substance?

A
A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.
B
A compound is a pure substance because it consists of two different elements, which are pure substances.
C
A compound is not a pure substance because it is not an element, and only elements are pure substances.
D
A compound is not a pure substance because each of its molecules is made up of the atoms of two or more different elements.
8

What does the chemical formula CaCl sub 2 show about the compound it represents?

A
It is made up of two elements.
B
It is made up of three elements.
C
It is made up of four elements.
D
It is made up of one element.
9

Which statement describes how chemical formulas, such as cap h sub 2 cap o , represent compounds?

A
They show the types of bonds that exist between elements.
B
They show the three-dimensional shape of a molecule.
C
They show the elements that make up a compound.
D
They show the types of molecules that make up an atom.
10

How many atoms of nitrogen are in the chemical formula Ni open paren NO sub 3 close paren sub 2 ?

A
2
B
1
C
6
D
3

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Compounds — Quiz Answers — Physical Science