Physical Science S2

Which of the following is a characteristic of pure substances?

• Can be separated by physical methods

• Uniform distribution

• Distinct properties

• Variable composition

What is an example of an element?

• Water

• Oxygen

• Sugar

• Tea

What is a compound?

• A substance that cannot be broken down by physical methods

• A substance that can be separated only by chemical methods

• A substance formed when two or more different elements join together chemically

• A substance made up of one type of atom

What is a mixture?

• A combination of two or more pure substances

• A substance that cannot be chemically decomposed

• A substance with distinct properties

• A substance with a fixed composition

Which of the following is an example of a homogeneous mixture?

• Beach sand

• Tea

• Salad

• Oil and vinegar dressing

What is a colloid?

• A type of mixture with particles that are too small to be seen with a microscope

• A type of mixture with large particles that settle

• A type of heterogeneous mixture with medium-sized particles

• A type of homogeneous mixture

What is the Tyndall effect?

• The scattering of light by particles in a solution

• The inability to see a light beam in a solution

• The inability to see a light beam in a colloid

• The scattering of light by particles in a colloid

Which of the following is a characteristic of a suspension?

• No Tyndall effect

• Particles settle

• Medium-sized particles

• Heterogeneous

What is the Law of Definite Composition?

• A given compound always contains the same, fixed ratio of elements

• A substance made up of one type of atom

• A substance that cannot be broken down by physical methods

• Elements can combine in different ratios to form different compounds

What is the Law of Multiple Proportions?

• A given compound always contains the same, fixed ratio of elements

• A substance that cannot be broken down by physical methods

• A substance made up of one type of atom

• Elements can combine in different ratios to form different compounds