AnswersNC-Physical Science Fall 1st 9 WeeksCompounds

Compounds Answers

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How many atoms of nitrogen are in the chemical formula Ni(NO3)2?

A
2
B
1
C
6
D
3
2
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Elena makes the table below to determine the number of atoms of each element in the chemical formula 3(NH4)2SO4.What mistake did Elena make?

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A
She should not have multiplied the sulfur atoms by the subscript 4.
B
She should not have multiplied the nitrogen atoms by the subscript 2.
C
She should not have multiplied the oxygen atoms by the coefficient 3.
D
She should not have multiplied the hydrogen atoms by the coefficient 3.
3

How many atoms of each element are in the chemical formula P2O5?

A
2 phosphorus and 5 oxygen
B
5 phosphorus and 2 oxygen
C
1 phosphorus and 5 oxygen
D
2 phosphorus and 1 oxygen
4

The compound magnesium phosphate has the chemical formula Mg3(PO4)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 5Mg3(PO4)2?

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

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

A
A compound is not a pure substance because each of its molecules is made up of the atoms of two or more different elements.
B
A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.
C
A compound is not a pure substance because it is not an element, and only elements are pure substances.
D
A compound is a pure substance because it consists of two different elements, which are pure substances.
6

Which of these is a compound?

A
O
B
CO2
C
O2
D
Co
7

There are several ways to model a compound. One type of model is shown.

Question illustration
A
CHO
B
C4H11O2
C
C6H12O2
D
C6H9O
8

Which statement describes how chemical formulas, such as H2O, represent compounds?

A
They show the types of molecules that make up an atom.
B
They show the elements that make up a compound.
C
They show the three-dimensional shape of a molecule.
D
They show the types of bonds that exist between elements.
9

What does the chemical formula CaCl2 show about the compound it represents?

A
It is made up of one element.
B
It is made up of two elements.
C
It is made up of three elements.
D
It is made up of four elements.
10

How many atoms of each element are in 4Na3PO4?

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

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