Ms. Sawh
Form 4 Chemistry

• Notebook: a new one/Form 3 notebook
• Lab book: purchase in school
• Syllabus (available online)
• Past Papers (available in bookstores/school)
• Access to Computer and my website: www.sawhcoolchem.weebly.com
• An email address
• Folder pages/manila folders

 What do you think the study of Chemistry is about?
 Why are you studying Chemistry?
 Do you think Chemistry has any relevance to your everyday life?
 How is Chemistry different to any other science e.g. Biology, Physics?

• Anything that has a mass and a volume

Close up view of atoms and their behavior
Animated images are from http://www.chem.purdue.edu/gchelp/

• Changing from one state to another is a
Physical Change , e.g. melting
Give another example.
• If a new substance is formed it is a
Chemical Change , e.g.
Give another example.
Images are from http://www.chem4kids.com

All Matter is made up of particles
• Name these particles.
• How do we know these particles exist?
• What evidence do we have that proves matter is made up of particles?

The particles that exist in matter are: atoms , molecules and ions .
The evidence that proves these particles exist are:
• Diffusion
• Osmosis
• Brownian Motion
• Write a definition of each and give examples.

Matter can be pure and impure.
How can we tell if a substance is pure?
Can you name any pure substances?
What are some impure substances?

• Atoms
• Elements
• Molecules
• Compounds
Can you write definitions for these pure substances and give examples?

• Smallest indivisible particles making up elements.
• The building blocks of Matter
• Consists of Protons (+), Electrons (-), and Neutrons (0).
• Consists of only one kind of atom,
• Cannot be broken down into a simpler type of substance by either physical or chemical means
• Can exist as either atoms or molecules.
• Give examples.
Images are from http://www.chem4kids.com

• A molecule consists of two or more
atoms of the same element, or different elements, that are chemically bound together.
Give examples.

• Atoms of two or more different elements
bound together.
• Can be separated into elements chemically, but not physically.
Give examples.
Animated images and notes from http://www.chem.purdue.edu/gchelp/atoms/elements.html

• Solutions are groups of molecules that are mixed up in a completely even distribution.
• They can be homogeneous or heterogeneous.
• Uniform Distribution.
• Example: Sugar and Water
Images are from http://www.chem4kids.com

:
• The substance to be dissolved.
• The one doing the dissolving.

• Particle sizes are in between the size of particles found in solutions and suspensions .
•
Can be mixed and remain evenly distributed without settling out.

• They are substances
(compounds,elements) held together by physical forces, not chemical.
• Can be separated physically.
• Solutions are also mixtures, but can be heterogeneous.
• The substances are not uniformly mixed.
• Example: Sand in a glass of water.
Images are from http://www.chem4kids.com

• Are heterogeneous mixtures consisting of parts that are visible to the naked eye.
• Substances will settle over time
.
Example: the ingredients in salad dressing

Matter
Mixtures
Pure
Substances
Homogeneous
Solution
Solvent Solution
Colloids
Heterogeneous
Suspensions
Element Molecule
Compounds

• How is a mixture different to a compound?
• How is a compound different to a molecule?
• How is an atom different to an element?
• Is a solution a pure substance?