Pure Substances and Mixtures Science Quiz Study Sheet

What is chemistry?

• Chemistry is the study of matter and changes in matter

What is saturation of a solution and how can you tell it is saturated?

• A solution is saturated when it has dissolved the maximum amount of solute

• You can tell it is saturated when additional solute will not dissolve in the solvent at a given temperature.

List three points abut particle theory.

• Particle theory is an explanation of why matter behaves the way it does

• Particle Theory states that:

• All matter is made up of tiny particles

• The particles are always moving

• There is space between all particles

• Adding heat makes particles move faster

• All particles in pure substance are the same. Different substances are made up of different particles.

How can you increase the rate that a solute dissolves into a solvent?

• You can increase the rate that a solute dissolves into a solvent by stirring the mixture or increasing the temperature.

Provide examples of mixtures.

• A mixture is a type of substance that contains more than one kind of particle.

• Some examples include coffee, saltwater, cookie dough, and soil.

Demonstrate your knowledge of vocabulary related to this unit by defining terms such as homogenous.

• Homogeneous - A uniform mixture made up of 2 or more pure substances.

• Heterogeneous - A mixture where the composition is not uniform.

• Pure substance - Any liquid, solid, or gas that only contains one type of particle throughout.

• Mixture - A type of substance that contains 1 or more particle

What is the universal solvent?

• Water is the universal solvent because it can dissolve more substances than any other liquid.

What is a mechanical mixture?

• A mechanical mixture is a type of mixture where the different substances keep their individual properties and can be easily separated, such as sand and gravel.