Science 9
Assignment Science922:
Name:
Date Submitted:
1. Do the Find Out Activity Put Safety First on page 93 of your textbook. You will find
the WHMIS safety symbols on page 447 of your book. You do not have to e-mail the
answers to this activity – it will give you some practice learning the WHMIS symbols.
2. Answer the following questions and e-mail Mrs. Sacher the answers to these
questions.
(a) What does the acronym WHMIS mean?
WHMIS stands for Workplace Hazardous Materials Information System.
(b) What does this WHMIS symbol tell you about a chemical? This sign means
Poisonous and infectious material. So if you drink it you will die!!!
(c) What does this WHMIS symbol tell you about a chemical? It tells you that it is a
corrosive chemical. (Class E) This symbol means corrosive material. So if you spill
it on you skin and don’t wash it off really fast it could burn you really bad.
(e) What does this WHMIS symbol tell you about a chemical? It tell you that it is a
flammable and combustible chemical. (Class B) This symbol means Flammable and
combustible material. So it could set on fire or explode!!
(f) Define the following terms:
- chemistry – The study of property of matter and the changes it undergoes
- caustic chemical – an agent that burns or destroys living tissue.
- pure substance – a material that contains only one kind of particle.
- solution – a homogeneous mixture of two or more pure substances.
- mixture – a combination of two or more pure substances such that each one’s
properties are not lost, but may be hidden.
- homogeneous mixture – a mixture in which particles uniformly scattered; has a
uniform composition.
- heterogeneous (mechanical) mixture – a mixture in which the particles are not
uniformly scattered; does not have a uniform composition.
- colloid – heterogeneous mixtures composed of fine particles evenly distributed
throughout a second substance.
- emulsion – types of colloids in which liquids are dispersed in liquids.
- emulsifying agent – keeps a liquid dispersed in another liquid. In salad dressing
it keeps the oil droplets from clumping together.
- combustion – the highly exothermic combination of a substance with oxygen;
requires heat, oxygen, fuel.
- corrosion – a process whereby metals or stone are chemically degraded or
broken down.