1. CHEMICAL AND MATERIAL BEHAVIOURS
CHEMISTRY

2. III.  CHEMICAL AND MATERIAL BEHAVIOURS (note that Chinese New Year Holiday is included, Jan. 23 to 30)       A.     Atom, Elements, and Compounds               1.     Chemical Alphabet               2.     Getting Sorted               3.     All Mixed Up               4.     Elements, Compounds, and Mixtures*       B.     Separating Mixtures               1.     Taking Salt from Underground               2.     Dissolving Rocks               3.     Sweet Tooth               4.     Pure Salt               5.     Super Solvents               6.     Distillation               7.     Better Boiling               8.     Major Crime Solving               9.     Chromatography       C.     TOPIC TEST REVIEW       D.     TOPIC TEST (week of March 26 to 30)

3. ELEMENT All the things are made up by tiny unit, element
Element is the tiny unit of all the objects
Element is the building block of the compounds
Element song
Element = simplest type of single substance
Atom = smallest part of all matter/ smallest part of element
Atom, element and compound
element and compound

5. Atoms: the basic unit of compounds and elements

6. Carbon and hydrogen atoms
Methane molecule
Carbon and hydrogen atoms

7. Compound Compound = two or more elements combine together
Molecules = at least two atoms join together
Molecules sometimes means compounds

9. Formula of chemicals: Sulphur dioxide: SO2
Carbon dioxide: = CO2 Water = H2O Nitrogen = N2 Oxygen =O2
Sulphur dioxide:
SO2

10. How can you tell that the following elements are molecules or not from their chemical formula?
Oxygen
Nitrogen
Fluorine
Bromine
Chlorine
Argon
Helium
Neon

11. How can you tell that the following elements are molecules or not from their chemical formula?
Oxygen O2
Nitrogen N2
Fluorine F2
Bromine
Br2
Chlorine
Cl2
Argon Ar
Helium He
Neon Ne

12. copper sulphide

13. Properties of metal Good conductor Shiny
Most of them can react with acid

14. Ag AC AC AB AC AB AC AB AB AC
Mixture
Element and compounds mix together Ag AC AC AB AC AB AC AB AB AC

15. Physical Reaction
Definition: Changing the state of substance and the reaction is reversible. e.g. From solid changes as liquid and then from liquid changes as gas. From gas goes back as liquid and then changes as solid.

16. Chemical Reaction Irreversible reaction
Colour will be changed after the reaction
Gas will be given out (= evolved)
Weight may change
Heat is given out, temperature is changing.
e.g. Magnesium reacts with Hydrochloric acid, forms Magnesium Chloride and Hydrogen.

17. Separation Methods