Term 2

In Term 2, we were taught S.I units and prefixes, the apparatus used to measure them with, how to find the density of irregular objects and the kinetic particle theory. The topics in this term taught were Elements, Compounds and Mixtures, Solutions and Suspensions, Separation Techniques and Cells.

S.I Units:

1. Temperature=Kelvin(K)
2. Time=second(s)
3. Length=metre(M)
4. Electric currents=ampere(A)
5. Mass=kilogram(kg)
6. Amount of substance=mole(mol)
7. Intensity of light=candela(cd)

Measurement: Vernier Calipers

1. Close the jaws and check for the zero error. To prevent zero errors, ensure that the zero marks on the main and vernier scales coincide.

2. Clamp the jaws on the object to measure the external length

3.Record the reading on the main scale

4. Record the reading on the vernier scale for the division which coincides with the main scale division to straight line

5.The actual measurement will be taken by adding both readings together

(Note: If the zero of the vernier scale is to the right of the zero of the main scale, a positive zero error is present in the instrument. If the zero of the vernier scale scale is to the left of the zero of the main scale, a negative zero error is present in the instrument. Thus, to get the correct length of the object, the zero error has to be added or subtracted from the recorded value.)

Elements: The Periodic Table