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Chemistry Unit 2 Part 2 - Changes in Matter

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Information about Chemistry Unit 2 Part 2 - Changes in Matter

Published on October 5, 2007

Author: shawnschlueter

Source: slideshare.net

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Matter and Change Part 2 – Changes in Matter

TAKS Student Expectation 11.8 Integrated Physics and Chemistry (8) Science Concepts. The Student knows that changes in matter affect everyday life. The student is expected to: (A) distinguish between physical and chemical changes in matter such as oxidation, digestion, changes in state and in the rock cycle Here’s what you have to do if you want to pass this part of the TAKS: Look at an observed change and know if it was physical or chemical. Know what the heck a rock cycle is! Know what “oxidation” means. Understand the basic ideas of digestion.

11.8 Integrated Physics and Chemistry (8) Science Concepts. The Student knows that changes in matter affect everyday life. The student is expected to:

(A) distinguish between physical and chemical changes in matter such as oxidation, digestion, changes in state and in the rock cycle

Here’s what you have to do if you want to pass this part of the TAKS:

Look at an observed change and know if it was physical or chemical.

Know what the heck a rock cycle is!

Know what “oxidation” means.

Understand the basic ideas of digestion.

Physical Change A change in the physical appearance of a substance that does not change the identity of the substance. LIQUID SOLID GAS

A change in the physical appearance of a substance that does not change the identity of the substance.

Physical Changes Phase Change – physical change from one state to another LIQUID Between 0°C and 100 0°C SOLID Below 0°C GAS Above 100°C Only the temperature changes Still H 2 O in every form!!!

Phase Change – physical change from one state to another

Physical Changes Examples of physical changes: Crushing an aluminum can Cutting your hair Shredding paper

Examples of physical changes:

Crushing an aluminum can

Cutting your hair

Shredding paper

Sample Question Source: Spring 2006 TAKS

Chemical Changes Chemical changes, or chemical reactions, occur when one or more substances is converted into another substance. Original atoms are preserved New substances are formed Different chemical composition than original substance

Chemical changes, or chemical reactions, occur when one or more substances is converted into another substance.

Original atoms are preserved

New substances are formed

Different chemical composition than original substance

Chemical Changes Chemical changes are chemical reactions. Indicated by a number of signs formation of a gas, formation of a solid, or precipitate change in temperature evolution of heat and light Change in color Change in odor

Chemical changes are chemical reactions.

Indicated by a number of signs

formation of a gas,

formation of a solid, or precipitate

change in temperature

evolution of heat and light

Change in color

Change in odor

Chemical Changes When iron (Fe) rusts, you can see it happen over a long period of time. The actual iron molecules change their structure as they react with oxygen and are oxidized.

When iron (Fe) rusts, you can see it happen over a long period of time.

The actual iron molecules change their structure as they react with oxygen and are oxidized.

Chemical Changes Examples of chemical changes: Grass growing Frying an egg

Examples of chemical changes:

Grass growing

Frying an egg

Sample Question Source: Spring 2004 TAKS

The Rock Cycle Lets Look at each part of the rock cycle and Which areas involve chemical change? Which areas involve physical change?

Lets Look at each part of the rock cycle and

Which areas involve chemical change?

Which areas involve physical change?

Sample Question Source: Spring 2004 TAKS

Sample Question Source: Spring 2003 TAKS

Digestion Lets Look at each part of the digestion Which areas involve chemical change? Which areas involve physical change?

Lets Look at each part of the digestion

Which areas involve chemical change?

Which areas involve physical change?

Sample Question Source: Spring 2004 TAKS

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