Physical and Chemical Properties

Book K

Warm Up: As you view the video clip, list examples of physical and chemical changes .

Physical Change Chemical Change

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Warm Up: As you view the video clip, list examples of physical and chemical changes .

Physical Change Chemical Change

1.

2.

3.

4.

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2.

3.

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Why are these physical changes? Why are these chemical changes?

Matter

Anything that has mass and takes up space!

Matter can be described and identified by physical and chemical properties. Physical properties have to do with appearance. You can observe many physical properties with your senses and by measuring the length, width, height, mass and density of a substance.

Physical properties include color, shape, smell, texture, taste, and size.

The state of matter (whether it’s a solid, liquid or a gas) and the temperature at which the substance boils, melts, or freezes are also physical properties.

We can group objects by their properties. How can we group these objects?

1. Did you sort them by color?

One property is color.

Color

Red

Green

Yellow

Size

Large objects

Small objects

2. Did you sort them by size?

A second property is size.

Circles

Squares Triangles

3. Did you sort them by shape?

A third property is shape.

Shape

Chemical properties on the other hand, have more to do with the atomic or molecular composition of matter.

Chemical properties deal with how substances react with other substances such as air, water, or fire.

A chemical change has occurred when a substance has changed into something new or different so that the original substance is gone.

Concept of Change

Change: altering or transforming from one form to another

How can you change your hair?

Concept of Change

Change: altering or transforming from one form to another

Physical Change a change that occurs that does not alter the identity of the substance

Chemical Changes one or more substances are changed into new substances with new and different properties

Homework:

Read interactive text p. 1-5 #1-16 Answer questions in the margins

Answers to p. 1-5 # 1-16 1. volume: liter

mass: kilogram

weight: Newton

2. Amount of space an object takes up

3. 1900 mL

4. Curved surface of a liquid in a container

5.

6. Volume

7. Area

8. 1 m2

Answers to p. 1-5 # 1-16 9. Put known volume of water in a g.c. add car and

measure increase in water level

10. Amount of matter in an object

11. Weight

12. No, Yes

13. Kg, g, mg

14. Newton (N)

15. Resisting a change in motion

16. Higher mass, more inertia

What are some physical properties of this ice cube?

What are some chemical properties of fireworks?

Concept of Change

Change: altering or transforming from one form to another

Physical Change a change that occurs that does not alter the identity of the substance

Examples: Physical Change

Sand a piece of wood

Sawdust is still wood!

Examples: Physical Change

Melting Butter

Examples: Physical Change

Dissolve Drink Mix

If you heat the mixture the water evaporates and solid sugar is left

Examples: Physical Change

Melting Ice

Physical Change

Why is this a physical change?

Chemical Changes one or more substances are changed into new substances with new and different properties

A chemical change is called a chemical reaction

Examples: Chemical Change

Digestion of food

Rotting Cooking

Rusting Burning

Chemical Change

Why is this a chemical change?

Evidence of a physical change:

1. Substance not changed- just size/shape

Still Paper!

Evidence of a physical change:

2. Changing state of matter

Solid Liquid

Evidence of a physical change:

3. Dissolving

Evidence of a physical change:

4. Bending, crushing, mixing

Evidence of a physical change:

5. Might be reversible

Evidence of a chemical change:

1. Color change

Evidence of a chemical change:

2. Gas produced: fizzing, foaming, bubbles

Evidence of a chemical change:

3. Heat

Evidence of a chemical change:

4. Sound or light produced

Evidence of a chemical change:

5. New substance is formed

Burning a candle produces ash, carbon dioxide and water vapor

Is it Physical or Chemical?

Change Physical Chemical

Melting cheese

Burning wood

Milk souring

Wadding up paper

Bicycle rusting

Homework:

Read interactive text p. 7-11

Answer questions in the margins

Answers to p. 7-11 # 1-15 1. Can be observed/measured without making a

new substance

2. Mass or weight, density, compressibility

3. Amount of matter in a given volume

4. Skip

5. Skip

6. When it is measured at the same temperature

and pressure

7. Zinc

8. If it is denser than water

9. Diet soda- less dense than water

Answers to p. 7-11 # 1-15 10. Liquid with the lowest density- corn oil

11. Affects the physical properties

12. Melting

13. Change of state

14. Change into a liquid or a solid

15. Nothing

When you are done checking your answers, put your

packet in the IT SECTION of your binder and take

out your notes sheet. Turn to side 2 of your notes

and find the THINK ABOUT IT data table.

Exothermic Endothermic

Gives off heat- temperature increases Absorbs heat- temperature goes down

heat energy EXITS the system

surroundings usually feel warmer

Ex: Monster Foam

Epson salts & water

heat energy ENTERS the system

surroundings usually feel cooler

Ex. Cold packs, melting ice

When you “pop” the inner pouch, the

chemical reaction absorbs heat energy

from the surroundings.