Science 9 Unit B

Section 1.0 – Matter can be described and organized by its physical and chemical properties

Goals for This Section:1. Identify the symbols used in the WHMIS

system

2. Identify the difference between physical and chemical properties of matter

3. Distinguish between pure substances and mixtures

4. Identify changes in matter as either chemical or physical changes

1.1 - Safety• Identify these

WHMIS Symbols:

• The HHPS (Household Hazardous Product Symbols) are used on substances sold in most stores

Hazard Type

Hazard Level

1.2 – Organizing Matter• Matter exists in three states

• The state of a substance depends on its temperature

http://www.clickandlearn.org

The Physical Properties of Matter• Physical properties can be used to describe

matter

• Some properties are qualitative (descriptive), while others are quantitative (can be measured)

• The following table includes different physical properties of matter:

Melting Point

Boiling Point

Hardness

Malleability

Ductility

Crystal Shape

Solubility

Density

Conductivity

Chemical Properties• Chemical properties describe how a particular

substance reacts with other substances

• Examples of chemical properties include:

Pure Substances• Pure substances are made of only one kind of

matter

• Pure substances can be elements or compounds

• Element:

• Compound:

Mixtures• Mixtures contain more than one type of matter

• Mechanical Mixtures:

• Solutions:

• Suspensions:

• Colloids:

1.3 – Observing Changes in Matter• Changes in matter can be physical changes or

chemical changes

• Physical changes is one where a substance changes from one state to another

• Physical changes are reversible

http://www.learner.org

Chemical Changes• Chemical changes occur when two or more

substances react and form a new substance

• The new substances have different properties than the original substances

http://cwx.prenhall.com

Evidence of Chemical Change• There are four major phenomena that indicate that

a chemical change has occurred:

Evidence of Change Example

Colour change

Odour change

Formation of solid or gas

Release or absorption of heat energy

Controlling Changes in Matter• Changes in matter can be used to produce

many products that we use everyday

• For instance, the chemical change known as fermentation can produce many substances, including beer, cheese, nail-polish remover, and fuel

http://www.public.iastate.eduhttp://blogs.menupages.com http://www.evecare.com http://img.coxnewsweb.com