Compounds

Question 1

Two models of the same compound are shown.

Revolt · Accepted Answer

Model A shows the three-dimensional shape of the molecule, but Model B does not.

Question 2

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

Revolt · Accepted Answer

2 phosphorus and 5 oxygen

Question 3

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?

Revolt · Accepted Answer

There are two phosphate ions in a molecule of magnesium phosphate.

Question 4

There are several different models that represent compounds. One type of model is shown.

Revolt · Accepted Answer

a ball-and-stick model

Question 5

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

Revolt · Accepted Answer

A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.

Question 6

How many atoms of oxygen in the chemical formula 2Ca(ClO2)2?

Revolt · Accepted Answer

8

Question 7

How many atoms of each element are in 4Na3PO4?

Revolt · Accepted Answer

12 sodium, 4 phosphorus, 16 oxygen

Question 8

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

Revolt · Accepted Answer

It is made up of two elements.

Question 9

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

Revolt · Accepted Answer

C6H12O2

Question 10

Which is the best description of a molecule?

Revolt · Accepted Answer

A molecule of a compound is composed of at least two atoms.

Compounds Answers

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