Grade 7 Science Q1 Ep9: Types of Mixtures Methods of Separating Mixtures

Homogeneous mixture

A mixture that has a uniform composition throughout.

Heterogeneous mixture

A mixture that is not uniform in composition and has at least two phases that remain separated from each other.

Evaporation

The process of separating a mixture by heating it to vaporize the liquid component, leaving behind the solid components.

Distillation

The process of separating a mixture by heating it to vaporize the more volatile component, then condensing the vapor to obtain the purified liquid.

Infiltration

The process of separating a mixture by passing it through a medium that retains the solid components while allowing the liquid or gas components to pass through.

Pure substance

A substance that is made up of only one type of particle and has a fixed composition.

Boiling point

The temperature at which a substance changes from a liquid to a gas.

Melting

The process of changing a substance from a solid to a liquid state.

Homogeneous mixture examples

Soda, cement, plastics.

Heterogeneous mixture examples

Salad, pizza, mixed nuts.

Colloids

A type of mixture where the particles are dispersed in a medium, but do not settle out.

Suspension

A type of mixture where the particles are larger and do settle out over time.

Solution

A type of mixture where the particles are evenly distributed and do not settle out.

Scattering

The process of redirecting light or other electromagnetic radiation in different directions due to interactions with particles or molecules in a medium.

Homogeneous mixture

A mixture where the particles are mixed together and there is no clumping. An example is air.

Heterogeneous mixture

A mixture where there are large aggregations or clumps of particles mixed together. An example is oil in water.

Solution

A homogeneous mixture with tiny particles that are too small to settle or be filtered out of the mixture. An example is sugar dissolved in water.

Colloid

A homogeneous mixture with medium-sized particles that are not enough to settle or be filtered out of the mixture. The particles are dispersed all throughout. An example is hair gel.

Suspension

A heterogeneous mixture with large particles that are large enough to be seen and be settled or filtered out of the mixture. An example is mud in water.