Physical and Chemical Change

Physical and Chemical Change

Open Ended

Quick Think:

How can we tell the difference between a physical and chemical change?

Physical Change

• Changes the form or appearance of a substance

• Does not change substance into anything new.

• Examples:

• Whipping eggs

• Boiling Water

• Dissolving Sugar

• Dicing Vegetables

Physical Changes Cont

• Changing the state of matter

• Changing the color

• Changing the shape

• Changing the texture

Multiple Select

What are the physical characteristics of an ice cube? (Select all that apply)

• Solid

• Smooth

• Cold

Multiple Select

Select all the examples of a physical change

• Smoke/ Fire

• Cutting a piece of paper

• Color Change

• Solid forming

• Melting

Recap: Chemical Change

• Occurs when two or more molecules interact and the molecules change into a new substance.

• Bonds between atoms are broken and created to form new molecules.

• Examples

• Iron rusting

• Gas Burning

• Eggs Cooking

• Bread Rising

Unexpected Color Change

• New molecules created in a chemical reaction radiate light differently producing new colors.

• Examples:

• Fireworks

• Leaves changing from green to orange and red in the fall

Unexpected Temperature Change

• During chemical bonding, energy is released or absorbed making their surroundings hotter or cooler.

Combustion/Burning

• A chemical reaction between substances, usually including oxygen accompanied by giving off heat and/or light.

• This a permanent change that cannot be undone

• Examples:

• Wood burning

• Burning a Candle

• Rusting

Bubbles Form

• When gases produced in a chemical reaction are released.

• Examples:

• Alka-Seltzer

• Bubbles released when vinegar and baking soda are combined