UNIT 2: ATOMS, ELEMENTS
AND COMPOUNDS
LAB SAFETY
LAB SAFETY
Making WHMIS Work
http://www.youtube.com/watch?v=R7hIUhXnG-Q#t=25
Lab Techniques & Safety: Crash Course Chemistry #21
https://www.youtube.com/watch?v=VRWRmIEHr3A
Chemistry Lab Safety Video
http://www.youtube.com/watch?v=3ELbwzqyuhs
Lab Safety
http://www.youtube.com/watch?v=cr7roogzM8c
Accident at Jefferson High
http://www.youtube.com/watch?v=PxyDImUYo14
Chapter 4
Properties of Elements and Compounds
(Page 136-175)
(Pearl Harbour, Hawaii)
Sunken USS Arizona shows signs of rust.
4.1 Studying Matter
Toronto propane
explosion
Learning Goals
• I can use WHMIS symbols and safety
icons to operate safely in the science
classroom.
• I can use the particle theory to explain how
matter is classified.
• I can explain how to separate mixtures.
• I can discuss important issues related to
the use of chemicals by humans.
4.1 Studying Matter (Pages 136-148)
Key concepts: (Page148)
• When studying matter, it is important to know
the location of safety equipment in your
classroom and the meanings of the safety
icons and WHMIS symbols.
• Matter can be classified according to its
composition, as mixtures or pure substances.
• An element is a pure substance that cannot be
broken down into simpler substances through
physical or chemical methods.
• A compound is a pure substance that is
composed of two or more elements that are
chemically combined. A compound can be
broken down into its elements only by chemical
methods.
• The production and use of new chemicals can
have both negative and positive consequences.
Benefits must be weighed against negative
consequences
Classification of Matter:
1. Copy down Figure 4.3:
Matter
Mixture
Mechanical Mixture
Solution
Pure Substances
Element
Compound
2. What is matter?
Matter is anything that has mass and occupies
space.
Particle Theory of Matter:
3. List 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 faster,
on average, than particles at a lower
temperature.
4. Based on the particle theory of matter, how can
matter be classified? List examples of each.
Matter
Mixture
Matter that contains more than
than one kind of particle.
Pure substances
Matter that contains
only one kind of particle.
Examples:
Water is a pure substance but salt water is a mixture of salt
dissolved in water.
Oxygen gas is a pure substance but the air we breathe is a
mixture of gases that includes nitrogen, oxygen, carbon dioxide
and other components.
5. Scientists have classified pure substances into two
main groups. Describe each one and list examples of
each.
Pure substances
Element
is a pure substance that cannot be
broken down further by chemical or
physical methods
zinc, copper, gold, helium
Compound
is a pure substance that is made
of two or more different elements
that are chemically combined
salt (sodium chloride), water
6. Differentiate between a compound and a mixture
A compound has two or more different elements
that are chemically compound. While a mixture
has two or more particles or has more than one
kind of particles.
7. List different ways on how to separate
mixtures.
filtering or sifting,
distillation, evaporation,
use of magnets, and by hand
8. Name an element that is part of your everyday
life, and describe how you use it.
Gold/Silver: wear as a part of jewellery
Oxygen: inhaled and transported by our
respiratory system
Chemistry, Society and the Environment:
9. Summarize some of the important issues related
to the use and production of chemicals by
copying Figure 4.6.
Practice
• Page 148, Questions 1-5, 8