SNC1W1 Chemistry: Atoms, Elements and Compounds

Biohazardous, Infectious materials - for organisms/toxins that can cause diseases in people/animals

Compressed gas - for gases under pressure

Environmental hazard - potential damage to the environment

Acute Toxicity - can cause death/toxicity with short exposure to small amounts.

Exclamation mark - can cause irritation to skin and eyes

Flammable - for fire hazards

Oxidizer - for oxidizing hazards

Explosive - for explosion or reactivity hazards

Health Hazard - may cause/suspected of serious health effects

Corrosive - for corrosive damage to metals, eyes and skin.

How can you determine the difference between a WHMIS symbol and a HHPS symbol?

A WHMIS symbol is typically in a circle, while an HHPS symbol is in either an octagon, diamond or rounded-triangle.

WHMIS

Workplace Hazardous Materials Information System.

MSDS

Material Safety Data Sheets

HHPS

International Hazard Symbols

Octagon HHPS Symbol

Danger

Diamond HHPS Symbol

Warning

Triangle HHPS Symbol

Caution

The Particle Theory of Matter

• All matter is made up of tiny particles.

• Each pure substance has its own kind of particle, which is different from the particles of other pure substances.

• Particles attract each other.

• Particles are always moving.

• Particles at a higher temperature move than particles at a lower temperature.

Pure substance

matter that contains only one kind of particle

Mixture

matter that contains more than one kind of particle

Two main groups of pure substances

elements and compounds

Element

pure substance that can’t be broken down into simpler parts by chemical methods

compound

pure substance made of two or more different elements that are chemically combined

Physical property

a trait of a substance that can be watched and measured without changing the identity of the substance.

Qualitative physical property

can be observed and described without measurement. ex. colour.

Quantitative physical property

can be measured and assigned a particular value. ex. melting point of a compound.

Solubility

a measure of the ability of a substance to dissolve in another substace.

Hardness

a substance’s ability to be scratched

Density

the ratio of the mass of a substance to the volume it occupies

Density formula

m/v

Chemical propertiies

the ability of a substance to change/react and form new substances

Combustibility

the ability of a substance to burn in air

Stability

the ability of a substance to remain unchanged

Toxicity

the ability of a substance to cause harmful effects in nature