Chapter 2:Lesson 1&2What are physical and chemical changes?By: Devon

Physical Changes Physical changes are in size, shape, volume, and state of

matter. Sawing wood, shredding paper, and melting wax are all

physical changes. Copper can be hammered into sheets, and gemstones carved into beautiful shapes as a result.

In each case, the substance does not change into something else.

Chemical changes A chemical change occurs when one kind of matter

changes into another type of matter with different properties.

Cooking a potato is one example of a chemical change. So is rusting iron.

It’s not always easy to tell when a chemical reaction occurs. Changes can cause heat, light, sound, and fizzing.

States of MatterState Exampl

e Example

Example

Solid Ice wood Gold

Liquid Water iodine Mercury

Gas Air Helium Nitrogen

The three types of matter:Solid, Liquid, GasThe states of matter are called physical property.Examples

MeltingMaterial Melting

Temperature

Oxygen -218

Nitrogen -210

Mercury -39

Sugar 146

Aluminum

660

Gold 1063

Nickel 1453

Iron 1535

Tungsten 3410

Each object reaches a point where it turns from a solid to a liquid or solid to gas or liquid to gas. That is a melting point. Each melting point is different.

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