MIXTURES(UNIT TWO, LESSON 2.3)BY MARGIELENE D. JUDAN

LESSON OUTLINE

MixtureTypes of MixturesSeparating Mixtures

MIXTURE

2 or more substances held together by physical forces

They do not create a new substance

TYPES OF MIXTURES

Homogeneous MixtureHeterogeneous Mixture

HOMOGENEOUS MIXTURE

Homo means “same”Components are evenly distributed

Cannot be separated by physical means

EXAMPLES

SolutionsColloidsothers

HETEROGENEOUS MIXTURE

Hetero means “different”Components are not evenly distributed

Can be separated by physical means

EXAMPLES

SuspensionsEmulsionsothers

Identify the following if it is a homogeneous or heterogeneous mixture:

Sand + water

Answer: HeterogeneousThey are distinguishable.

Water

Sand

Juice powder + water

Answer: HomogeneousYou can’t distinguish the parts of the mixture

They have been evenly mixed.

Water??

Juice Powder??

Homogeneous or heterogeneous?

Answer: HeterogeneousThey are distinguishable and can be physically separated.

Red M&M’s

Orange M&M’s

Yellow M&M’s

Brown M&M’s

etc

Is air a mixture? If so, what kind?

Yes. Air is composed of 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide, and other gases. Since you cannot distinguish them, air is a homogenous mixture.

COMMON METHODS OF SEPARATING MIXTURES

PickingMagnetic SeparationDecantationDistillationSolar EvaporationFiltration

PICKING

large solid to solid mixture

MAGNETIC SEPARATION

Solid to solid metal mixture

FILTRATION

Solid(not dissolved) to liquid mixture

SOLAR EVAPORATION

Solid (dissolved) to liquid mixture

DECANTATION

Liquid to liquid non-dissolvable mixture

Solid (settled on bottom) to liquid mixture

DISTILLATION

Liquid to liquid mixture

SEPARATING MIXTURES SUMMARY

Method Component 1 Component 2 Example

Picking solid (large chunks)

solid rock and gravel

Magnetic Separation

solid (metal) solid sulfur powder and iron fillings

Decantation liquid or solid (non-dissolvable)

liquid sand and wateroil and water

Distillation liquid liquid oil and wateralcohol and water

Solar Evaporation

solid (dissolvable)

Liquid salt and water

Filtration Solid (non-dissolvable)

Liquid or solid sand and gravelsand and water

Separating mixtures are not limited to one method. For example, you could separate sand and water through decantation, filtration, and evaporation, though some methods work best in different situations.

Activity: (1 whole sheet of paper) 1. Write a short paragraph about the mixtures you see at home, and tell why are they important to us. (5 pts)

Then, relate the lesson to your spiritual life. (5 pts)

Assignment: Notebook

I. Classify whether it is a homogeneous or heterogeneous mixture.

1. air

2. sand water

3. ink

4. different types of stones

5. oil and water

Assignment: Notebook

II. Identify which method is best to use in order to separate the following mixtures:

1. M&M’s chocolate

2. Alcohol and water

3. Saltwater

4. Sand and gravel

5. Iron fillings and talc powder

SOURCES:

Science Links 7 https://www.youtube.com/watch?

v=TlxajGi8bAI