G7 T3 L1: Mixtures and Solutions

What is a mixture?

• A single substance that cannot be separated into simpler substances

• A substance made up of only one type of atom

• A combination of two or more substances that are chemically combined

• A combination of two or more substances that are physically combined

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

• Salt water

• Air

• Milk

• Sand

What are the properties of a heterogenous mixture?

• The components are not spread out evenly throughout the mixture

• The components can easily be seen and sorted

• The components are not chemically combined

• The components are difficult to see and spread out uniformly throughout the entire mixture

Why can mixtures be easily separated?

• Because the components are physically combined

• Because the components keep their individual properties

• Because the components are spread out evenly throughout the mixture

• Because the components are chemically combined

How can mixtures with particles of different sizes be separated?

• By heating the mixture until some components evaporate

• By filtering the mixture to remove larger particles

• By settling or filtration

• By using a magnet to separate magnetic components

What is a colloid?

• A homogeneous mixture of a solvent and one or more solutes

• A heterogenous mixture containing small, undissolved particles that do not separate or settle out if the mixture is undisturbed

• A mixture with particles that can be seen and easily separated by settling or filtration

• A mixture made of two or more substances that are together in the same place

What is a solution?

• A homogeneous mixture of a solvent and one or more solutes

• A mixture made of two or more substances that are together in the same place

• A mixture with particles that can be seen and easily separated by settling or filtration

• A homogeneous mixture containing small, undissolved particles that do not separate or settle out if the mixture is undisturbed

What is the solvent in a solution?

• The measure of the amount of solute that can be dissolved in a solvent

• The substance that is dissolved by the solvent

• The part of the solution that is usually present in the smallest amount

• The part of the solution that is usually present in the largest amount

What is the solute in a solution?

• The measure of the amount of solute that can be dissolved in a solvent

• The substance that is dissolved by the solvent

• The part of the solution that is usually present in the largest amount

• The part of the solution that is usually present in the smallest amount

What physical properties of matter are affected by the concentration of a solution?

• Viscosity and conductivity

• Density and color

• Boiling point and freezing point

• Melting point and hardness