S1.1

Which of the following is a pure substance?

• Air

• Salt water

• Iron

• Sand

What is the simplest form of matter that cannot be broken down chemically?

• Mixture

• Element

• Solution

• Compound

What is the molecular formula for methane?

• CO2

• NaCl

• H2O

• CH4

Which of the following is a characteristic of mixtures?

• Fixed composition

• Chemically bonded components

• Can be separated by physical methods

• Consist of only one type of substance

What type of mixture has visible phases or boundaries?

• Homogeneous

• Heterogeneous

• Colloidal

• Aqueous

What is the process called when a solid changes directly to a gas?

• Condensation

• Sublimation

• Evaporation

• Deposition

Which separation technique is used to separate an insoluble solid from a liquid?

• Filtration

• Chromatography

• Evaporation

• Distillation

Which state of matter has a fixed shape and volume?

• Gas

• Plasma

• Liquid

• Solid

What is the term for the process where a liquid turns into a gas?

• Condensation

• Evaporation

• Sublimation

• Freezing

What is the density of water?

• 0.5 g/cm³

• 1.00 g/cm³

• 7.87 g/cm³

• 0.001 g/cm³