Here's a link to a topical question book for you to do during our class periods. Since we are stationed in the computer lab, you could use this each time we have a lesson together.
http://dl.dropbox.com/u/27835436/F4%20SCI%20TOP.1.pdf.zip
Cheers,
Teacher Ben
10:55AM | 17th July 2012
Dear Art Stream students,
I've searched for some videos for all of you to watch regarding the uses of metal. Instead of just telling you what its for, I figured it would be more interesting for you to see how certain things are made (where the properties of metals or non metals are applied)
How Its Made: Wires
How Its Made: Aluminium Foil
How Its Made: Contact Lenses
How Its Made: Carbon Dioxide Cartridges
How Its Made: Coloured Pencil
Methods of Substance Purification
Separating Mixtures with Distillation
Crystallization of Salt
Homework: SPM Focus Practice 4
Try your best to do the questions, ask any questions that you may have.
11:05AM | 20th June 2012
Hey Form 4, this video is about subatomic particles; protons, neutrons and electrons. Watch this first:
Key points:
- Protons carry positive charge (+ve).
- Electrons carry negative charge (-ve).
- Neutrons carry no charge. There is no such thing as 'neutral charge'.
- There are two types of 'numbers':
- Proton number
- Total number of protons in an atom
- Nucleon number
- Total number of protons and neutrons
- You don't learn 'neutron number' at Form 4. It is not part of your syllabus, so don't worry about it.
- Neutron and Proton makes up the nucleus of the atom. The nucleus is surrounded by the electrons.
- Number of electrons and protons are always equal in a neutral atom (without charge; for instance, Na, Ca, O, C, etc. Example of charged atoms are Na+, Ca2+, etc)
- When an ATOM becomes an ION, it either RECEIVES electrons (reduction) or LOSES electrons (oxidation).
- Oxidation is losing electron. The oxidation number of the atom increases.
- Reduction is gaining electron. The oxidation number of the atom reduces.
10:23PM | 24th July 2011
