Physical & Chemical Properties &

ReactionsLearning Target 5a

(LT5a): Describe the physical and chemical properties of a substance. Classify changes a substance undergoes as physical or chemical changes.◦ Meets:

Identify examples of physical properties Identify examples of chemical properties Differentiate a physical reaction from a chemical

reaction◦ Exceeds:

Given a reaction, I can explain and defend whether or not it is a physical or a chemical reaction

Learning Target

Properties of Substances

Physical Properties: are able to observed or measured without changing the identity of the substance.

Examples:◦ Color◦ Odor (smell)◦ Density (mass/volume)◦ Malleability (ability to bend)◦ Elasticity (ability to return to its original shape)◦ Conductivity (ability to flow energy, heat, or

electricity)◦ Insulator (resisting flow of energy, heat, or

electricity)

Physical Properties

Only are able to be observed when the identity of the substance is changed

Examples:◦ Flammability◦ Reactivity

Chemical Properties

Any change which does NOT change the identity of the substance◦ The same chemicals are

still present Examples:

◦ Mixing◦ Dissolving◦ Melting◦ Heating/cooling

Physical Change

Any change which results in a NEW substance◦ New chemicals are created

Evidence of a chemical change:◦ Color change◦ Gas production◦ Temperature change

Chemical Change

Example: Paper

Change: Physical or Chemical change? ..Why?

Observations… Wad:

Tear:

Soak in water:

Burn:

Identify examples of physical properties? Identify examples of chemical properties? Differentiate a physical reaction from a

chemical reaction? Given a reaction, I can explain and defend

whether or not it is a physical or a chemical reaction?

Can you…?

Example: Bag

Change: Physical or Chemical change? ..why?

Observations… Mix Solids:

Add Red Liquid: