Compounds "content recovery"

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

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

Which is the best description of a molecule?

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

Two models of the same compound are shown. In what way is Model A better than Model B?

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

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

2

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

2 phosphorus and 5 oxygen

There are several ways to model a compound. One type of model is shown. What is the chemical formula for the molecule modeled?

C6H12O2

Which of these is a compound?

CO2

Carl makes the table below to determine the number of atoms of each element in the chemical formula 4Ca(ClO3)2. What mistake did Carl make?

He did not multiply the chlorine and oxygen atoms by the coefficient 4.

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

It is made up of two elements.

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?

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