Chemistry Quiz

What is a compound?

• A single element found in nature

• A mixture of two or more elements that are not chemically combined

• Two or more elements chemically combined

• A natural resource found in the earth

How do the properties of a compound compare to the properties of the elements that make it up?

• The properties of a compound are the same as the properties of the elements that make it up

• The properties of a compound are slightly different from the properties of the elements that make it up

• The properties of a compound are very different from the properties of the elements that make it up

• The properties of a compound are only different in a chemical reaction

Which of the following is an example of a compound?

What is the purpose of a chemical formula?

• To determine the physical properties of a compound

• To tell what elements and how many of each element are in a unit of a compound

• To describe the temperature at which a compound melts

• To explain the chemical reactions a compound can undergo

What does the chemical formula H2O represent?

• Ammonia

• Hydrogen peroxide

• Water

• Hydrochloric acid

How many atoms of hydrogen are present in a molecule of water (H2O)?

• 1

• 2

• 3

• 4

What does the chemical formula NH3 represent?

• Methane

• Nitric acid

• Ammonia

• Nitrous oxide

How many atoms of hydrogen are present in a molecule of ammonia (NH3)?

• 1

• 2

• 3

• 4

How many atoms of nitrogen are present in a molecule of ammonia (NH3)?

• 1

• 2

• 3

• 4

Why do elements form compounds?

• To increase their atomic number

• To be stable

• To create new elements

• To decrease their mass