Transcript Topic 1 - Calgary Christian School

Topic 1
Exploring Matter
Safety Symbols
 Symbol Shapes: These shapes and their colours indicate how
dangerous a substance is.
Safety Hazard Symbols
WHMIS Symbols
WHMIS (Series: SafetyCare) learn alberta 15 minutes
http://www.learnalberta.ca/content/ctm/index.html?smil=whmis
 What does WHMIS stand for?
 Workplace Hazardous Materials Information System
Lab Safety Rules
The Particle Model of Matter
 All matter is made up of extremely tiny particles
 Each pure substance has its own kind of particle,
different from the particles of other pure
substances
 Particles attract each other
 Particles are always moving
 Particles at higher temperatures move faster on
average than particles at lower temperatures
Classifying Matter
 Attractive forces between particles are weakest in gases,
stronger in liquids, and strongest in solids.
 http://www.youtube.com/watch?v=KCL8zqjXbME&feature=fvwrel
(5 min)
Classifying Matter
http://www.youtube.com/watch?v=WB0Kr8VA-74
(3 min)
Classifying Matter
 Pure Substances
 Elements
 A material that cannot be broken down into any simpler substance.
Elements are the basic building blocks for all compounds. Elements
are organized onto the periodic table according to their properties.
 Ex. Hydrogen (H), Carbon (C), and Oxygen (O)
 Compounds
 When two or more elements combine chemically. When hydrogen
and oxygen are combined in specific proportions, they form the
compound water.
 Ex. Water (H2O), Carbon dioxide(CO2)
Classifying Matter
 Mixtures
 Homogeneous Mixtures (solutions)
 The different substances that make it up are not separately visible. One substance is
dissolved in another.
 Substances dissolved in water are called aqueous solutions
 Ex. See table.
 Heterogeneous Mixtures (mechanical mixtures)
 The different substances that make up the mixture are visible.
 Ex. Soil
 Suspensions
 A cloudy mixture in which tiny particles of one substances are held within another.
 Ex. Tomato Juice – These particles can be separated when poured through filter
paper.
 Colloids
 A cloudy mixture in which the particles of the suspended substance are so small that
they cannot be easily separated out from the other substance.
 Milk – These particles cannot be easily separated.
http://www.youtube.com/watch?v=U50qw3HTvc4&feature=related]
Classifying matter song

Classifying Matter
 One way to tell the difference between a solution and
a colloid is to shine a light through them. A solution will
not allow the light to scatter. A colloid will scatter the light
because the particles are larger than those in a solution.
 The light scattering property of colloids is called the Tyndall
effect. http://www.dnatube.com/video/11145/The-Tyndall-Effect