CM 02.4 Mixtures of Matter

Mixtures

and Matter

Lesson 2.4

Lesson 2.4 Mixtures of Matter

substance: a form of matter that has a uniform and
unchanging composition; also known as a pure
substance

• Contrast mixtures and substances.
• Classify mixtures as homogeneous or heterogeneous.

• List and describe several techniques used to separate mixtures.

Most everyday matter occurs as
mixtures—combinations of two or more
substances.

mixture

heterogeneous mixture

homogeneous mixture

solution

filtration

distillation

crystallization

sublimation

chromatography

Lesson 2.4 Mixtures of Matter

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

Mixtures

A homogenous mixture is a mixture where the composition is constant throughout.

A heterogeneous mixture is a mixture where the individual
substances remain distinct.

Mixtures

• Homogeneous mixtures are also called solutions.

Mixtures

Mixtures

Separating Mixtures

• Filtration is a technique that uses a porous barrier to separate a solid from a liquid in a heterogeneous mixture.

Separating Mixtures

• Distillation is a separation technique for

homogeneous mixtures that is based on the
differences in boiling points of substances.

Separating Mixtures

• Crystallization is a separation technique for

homogenous mixtures that results in the
formation of pure solid particles from a
solution containing the dissolved substance.

Separating Mixtures

• Sublimation is the process of a solid

changing directly to a gas, which can be
used to separate mixtures of solids when
one sublimates and the other does not.

Separating Mixtures

• Chromatography is a technique that separates the components of a mixture on the basis of tendency
of each to travel across the surface of another
material.

Multiple Choice

Which is NOT a technique for separating a
homogeneous mixture?

• crystallization

• distillation

• filtration

• chromatography

Multiple Choice

Which of the following is a heterogeneous
mixture?

• seawater

• silver mercury amalgam

• atmosphere

• salad dressing

Categorize

Options (15)

sugar

salt

olive oil

milk

flour

rice

water

fruit salad

mixed nuts

vegetable stir-fry

chocolate chip cookies

sushi platter

cheese board

pasta primavera

taco bar

Classify each of the following as either a heterogeneous or a homogeneous
mixture.

Homogenous

Heterogenous

Open Ended

Compare mixtures and substances.

Section 3.3 Mixtures of Matter

Key Concepts

• A mixture is a physical blend of two or more pure

substances in any proportion.

• Solutions are homogeneous mixtures.

• Mixtures can be separated by physical means.

Common separation techniques include filtration,
distillation, crystallization, sublimation, and
chromatography.