CPC 2.4 Mixtures

Multiple Choice

What is a substance?

• Matter with a uniform and unchanging composition

• A uniform mixture of different elements

• A type of energy that comes from uniform and unchanging matter

• A form of matter with a changing composition

Multiple Choice

What is another name for a substance?

• Compound

• Mixture

• Pure substance

• Solution

Multiple Choice

What does it mean that a substance is UNIFORM?

• It has a changing composition

• the substance is rigid and solid

• all of the substance is made of the same thing

• the substance is a mixture of different things

Multiple Choice

What is a mixture?

• A combination of two or more pure substances in which each substance retains its individual chemical properties.

• A single pure substance with uniform chemical properties.

• A combination of two or more pure substances that lose their individual chemical properties.

• A single pure substance with varying chemical properties.

Multiple Choice

What is a characteristic of a homogeneous mixture or solution?

• It has constant composition throughout.

• It does not have a uniform composition.

• The individual substances remain distinct.

• It is a combination of two or more pure substances.

Multiple Choice

Which type of mixture does not have a uniform composition?

• Heterogeneous mixture

• Homogeneous mixture

• Solution

• Pure substance

Multiple Choice

Which type of solution system is represented by air in a scuba tank, which is primarily a mixture of nitrogen, oxygen, and argon gases?

• Gas-liquid

• Liquid-gas

• Gas-gas

• Solid-liquid

Multiple Choice

What type of solution system is formed when oxygen and carbon dioxide are dissolved in seawater?

• Gas-gas

• Gas-liquid

• Liquid-liquid

• Solid-solid

Multiple Choice

What type of solution system is represented by solid salts dissolved in seawater?

• Solid-liquid

• Gas-gas

• Liquid-gas

• Solid-solid

Multiple Choice

Often two metals are mixed together to make a stronger, less corrosive metal. Examples are brass, bronze and steel. What type of solutions are these?

• solid-solid

• solid-liquid

• liquid-gas

• gas-gas

Multiple Choice

All matter can be classified into which two groups?

• As elements or compounds

• As pure substances or mixtures

• As heterogeneous or homogeneous mixtures

• As solids or liquids

Multiple Choice

What type of changes are needed to change pure substances into mixtures?

(or mixtures into pure substances)

• Physical and Chemical Changes

• Chemical Changes

• Physical Changes

• No Changes

Multiple Choice

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

• Dirt

• Blood

• Lemonade

• Oxygen

Multiple Choice

Which of the following is an example of a pure substance?

• Milk

• Gasoline

• Steel

• Gold

Multiple Choice

What type of changes are needed to change elements into compounds?

(or compounds into elements)

• Physical changes

• Chemical changes

• Both physical and chemical changes

• No changes

Multiple Choice

Why can a magnet separate a mixture of iron and sand?

• Because a magnet attracts both iron and sand

• Because a magnet attracts iron but not sand

• Because a magnet repels iron but attracts sand

• Because a magnet repels both iron and sand

Multiple Choice

What type of processes are used to separate mixtures?

• Chemical processes

• Physical processes

• Biological processes

• Electrical processes

Multiple Choice

Which of the following is NOT a method to separate mixtures based on physical properties?

• Using a magnet

• Filtration

• Distillation

• Chemical reaction

Multiple Choice

What is the main principle behind the distillation process?

• Differences in solubility

• Differences in particle size

• Differences in boiling points

• Differences in density

Multiple Choice

Which separation technique is used for homogeneous mixtures?

• Filtration

• Decantation

• Distillation

• Centrifugation

Multiple Choice

What is the purpose of the filter paper in the filtration process?

• To absorb the liquid

• To separate the solid residue from the filtrate

• To increase the boiling point

• To cool down the mixture

Multiple Choice

In the distillation process, what is the role of the thermometer?

• To measure the temperature of the heat source

• To measure the boiling point of the substance

• To measure the pressure inside the apparatus

• To measure the volume of the liquid

Multiple Choice

What is the process called during which a solid changes to vapor without melting?

• Crystallization

• Chromatography

• Sublimation

• Distillation

Multiple Choice

What does crystallization form from a solution containing the dissolved substance?

• Pure solid particles

• Liquid particles

• Gaseous particles

• Mixed particles

Multiple Choice

What is the technique called that separates the components of a mixture dissolved in either a gas or a liquid?

• Crystallization

• Chromatography

• Sublimation

• Filtration

Multiple Choice

Which of the following is an example of a mixture?

• hydrogen peroxide

• water

• air

• rust

Multiple Select

What is true of a mixture?

Choose 2

• It can only be separated by chemical means.

• It may be a solution.

• It may be heterogeneous but not homogenous.

• It may be heterogeneous or homogenous.

Multiple Choice

An alloy is which of the following?

• solid-solid solution 

• heterogeneous mixture

• compound

• homogeneous mixture, but not a solution

Multiple Choice

Which of the following is not a solution?

• gasoline

• steel

• lemonade

• baking soda

Multiple Choice

Ink is often a mixture of several dyes. The dyes can be separated because they spread through paper at different rates. What method could be used to separate the dyes in the mixture?

• chromatography

• distillation

• sublimation

• crystalization