Science 1206

Unit 3 – Chemistry

Section 1

Lessons 1 - Introduction to Chemistry

In this lesson you will:

• define chemistry and matter • identify examples of chemistry and technology

around us in everyday life

What is Chemistry?• Explosions? • Baking?• Chemicals?• Freezing? Melting?

• What are chemicals?

– You probably would answer with - things that are found in bottles in the lab.

• Fact is, practically everything in and around you is one or more chemical substances.

• We use the term matter to represent all chemical substances.

Chemistry is used in either the creation or use of all of these Substances

Chemistry

• The study of Matter, its properties and changes it can undergo.

• Chemistry is the study of matter, its properties, and the changes or chemical reactions that matter can undergo.

– Sample Reactions:• A. Oxidation of Iron or Rusting• B. Oxidation of a candle or Burning of candle

wax.• C. Vinegar +Baking Soda Carbon Dioxide

• Reactants --- The materials Present at the Start of a Reaction.

• Products --- The materials CREATED in a chemical reaction.

Matter

Anything that has mass and volume (occupies space)

Mass = Amount of material in a substance. Measured in grams (g).

Volume = Space occupied by an object.

The Branches of Chemistry• There are two major

branches of chemistry:

• Pure chemistry deals with describing known substances and discovering new compounds.

• Applied chemistry is the search for uses for chemical substances.

• Chemists discover new materials and their properties.

• Technologists adapt materials to meet your needs

Chemistry Involves Reactions!

• Reactants Starting materials in a reaction.• Products Materials created in a reaction.

Fe(s) + O2(g) FeO(s)

1. Which branch of science studies the interactions among various types of atoms and the compounds they make?

a. Meteorology.b. Physics.c. Biology.d. Chemistry.

   

Quiz

2. Which term is defined as anything that has mass and takes up space?

a. Vacuum.b. Volume.c. Matter.d. Electrons.

3. Which is an example of oxidation?

a. Rusting of iron.

b. Freezing of water.c. Donating hydrogen.d. Splitting a salt crystal into two parts.

4. When vinegar and baking soda are mixed, what evidence suggests that a chemical reaction is taking place?

a. Bubbles of gas are formed.b. There is a colour change.c. There is a precipitate formed.d. Atoms are destroyed.

5. What happens to atoms during a chemical reaction?

a. Atoms are destroyed.b. Atoms are created.c. Atoms are rearranged.d. Nothing happens to the atoms.

 

 

6. Which term refers to what you have at the start of a chemical reaction?

a. Reactants.b. Products. c. Compounds. d. Molecules.

7. Which branch of science attempts to identify new uses for chemical compounds?

a. Pure chemistry.b. Applied chemistry.c. Pure physics.d. Applied physics.

Activity

• Learn the name, symbol and atomic number of elements numbered 1 to 20 in your periodic table (Page 728). A periodic table is also available on your “Notes and Handouts” page.

• Watch the clip #1 posted on our “Course Video” page.