MIXTURES PURE SUBSTANCES AND...Mixtures are formed by combining two or more pure substances together...

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PURE SUBSTANCES AND MIXTURES

Transcript of MIXTURES PURE SUBSTANCES AND...Mixtures are formed by combining two or more pure substances together...

Page 1: MIXTURES PURE SUBSTANCES AND...Mixtures are formed by combining two or more pure substances together without them undergoing a chemical change. Therefore, there are two or more substances

PURE SUBSTANCES AND MIXTURES

Page 2: MIXTURES PURE SUBSTANCES AND...Mixtures are formed by combining two or more pure substances together without them undergoing a chemical change. Therefore, there are two or more substances
Page 3: MIXTURES PURE SUBSTANCES AND...Mixtures are formed by combining two or more pure substances together without them undergoing a chemical change. Therefore, there are two or more substances

QUICK REVIEW

• An element is a substance made up of atoms of one kind.

• A molecule is formed when atoms of the same elements combine.• Two atoms of oxygen combine to form a molecule of oxygen [O

2]

• A compound is formed when atoms or molecules of different elements combine chemically.• Hydrogen and oxygen are combined in a fixed proportion of 2:1 to

form the compound water [H2O].

• Mixtures are two or more substances that are mixed together but not chemically joined.

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PURE SUBSTANCE VS. MIXTURE

A pure substance: • made up of 1 type of particle

• ELEMENT= made of 1 type of atomExamples?????

• COMPOUND= made of 1 type of moleculeExamples?????

• cannot be separated into 2 or more substances by physical means

• has uniform composition throughout the whole sample

Page 5: MIXTURES PURE SUBSTANCES AND...Mixtures are formed by combining two or more pure substances together without them undergoing a chemical change. Therefore, there are two or more substances

A mixture: Mixtures are formed by combining two or more pure

substances together without them undergoing a chemical

change.

Therefore, there are two or more substances in the same

space or container.

• can be separated into 2 or more substances by physical or mechanical means

• displays the characteristic properties of the pure substances making it up

• its composition can be varied by changing the proportion of pure substances making it up

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Mixtures are different from pure substances

because they contain at least two different

types of particles instead of just one.

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There are two different types of mixtures....

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When a mixture’s components are easily

recognizable from one another it is called a

HETEROGENEOUS MIXTURE.

You can see different particles. The particles

are not evenly distributed.

Examples: ???

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In a HOMOGENEOUS MIXTURE, the parts all look

the same, even though the substances inside still

retain their original properties.

Also known as a solution.

All parts of the mixture look the same. Particles are

evenly distributed.

Examples???

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Type of Mixture

Example

gas in gasThe atmosphere is a mixture of gases, mostly nitrogen and oxygen.

liquid in liquid Wine is a mixture of mostly ethanol and water.

solid in solidAlloys, such as brass, are made up of a mixture of metals.

gas in liquidSoft drinks, such as cola, are mixtures of mainly carbon dioxide gas and water.

solid in liquid Sea Water is a mixture of salts dissolved in water.

solid in gasSmoke is mixture of tiny solid particles in atmospheric gases.