Question: In what way is Model A better than Model B?

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

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

What type of model is shown?

Answer: a ball-and-stick model

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

What type of model is shown?

Answer: a structural formula

Question: Two models of the same compound are shown.

In what way is Model B better than Model A?

Answer: Model B shows how the atoms in the molecule are connected, but Model A does not.

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

What is the chemical formula for the molecule modeled?

Answer: C6H12O2

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

Answer: 2

Question: There are___atoms of oxygen in the chemical formula 2Ca(ClO2)2.

Answer: 8

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

Answer: 2 phosphorus and 5 oxygen

Question: How many atoms of each element are in the chemical formula Ca(OH)2?

Answer: 1 calcium, 2 oxygen, and 2 hydrogen

Question: How many atoms of each element are in 4Na3PO4?

Answer: 12 sodium, 4 phosphorus, 16 oxygen