Chemistry Compound Quiz

What is a compound in chemistry?

• A mixture of two or more elements

• A single element in its pure form

• 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 are the same

• The properties are slightly different

• The properties are very different

• The properties depend on environmental factors

Which example illustrates a compound?

• Pure sodium (Na)

• Chlorine gas (Cl2)

• Table salt (NaCl)

• A mixture of hydrogen and oxygen gases

What is the purpose of a chemical formula in chemistry?

• To determine the physical properties of a compound

• To indicate the number of each type of atom in a unit of a compound

• To provide the molecular weight of a compound

• To show the boiling point of a compound

What does the chemical formula H₂O represent?

• Ammonia

• Methane

• Water

• Hydrogen Peroxide

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

• 1

• 2

• 3

• 4

What is the primary reason elements form compounds according to the slide?

• To increase their atomic number

• To be stable

• To create more elements

• To decrease their mass

According to the Octet Rule, how many electrons do most atoms strive to have in their outer energy shell for stability?

• 2

• 18

• 8

• 10

Which of the following elements does NOT follow the general rule of having 8 electrons in the outer shell for stability?

• Oxygen

• Carbon

• Hydrogen

• Nitrogen

What happens to sodium (Na) when it forms a compound with chlorine (Cl)?

• It gains an electron

• It loses an electron

• It shares an electron

• It does not change