Gr 11 Physical Sciences Prelim & Final 2024
Previous exam papers were used to compile these notes. @IMPAQ NOV 2019, @IMPAQ
NOV 2020 @IMPAQ NOV 2021, EC/NOVEMBER 2023, EC/NOVEMBER 2022,
EC/NOVEMBER 2021, EC/NOVEMBER 2020
Content:
Qualitative aspects of chemical change p. 3
CHEMICAL CHANGE:...
Previous exam papers were used to compile these notes. @IMPAQ NOV 2019, @IMPAQ
NOV 2020 @IMPAQ NOV 2021, EC/NOVEMBER 2023, EC/NOVEMBER 2022,
EC/NOVEMBER 2021, EC/NOVEMBER 2020
These are only suggested answers from the memorandums. Some information is repeated,
I want to show you the different ways the same information is asked.
I encourage you to answer the calculation/illustration questions.
Good luck. Juffrou Ansie
Content:
Qualitative aspects of chemical change p. 3
CHEMICAL CHANGE: Energy and change p. 21
CHEMICAL CHANGE: Type of reactions p. 29
Matter & material: Ideal gas p. 33 - 39
@Juffrou_Ansie
, 2
CH4 molecule This molecule is non-polar, even if it has at least one polar bond
CH3Cl This substance that has polar bonds, a polar molecule and tetrahedral
shape.
Trigonal bipyramidal The molecular geometry of a molecule that has five bonding pairs around
the central atom.
Lewis diagrams of BH3
Lewis diagrams of NH3
Ion-dipole forces Sodium hydroxide (NaOH) dissolves in distilled water (H2O). The
intermolecular forces that are responsible for this observation, is Ion-
dipole forces
The Lewis diagram above represents an argon atom or a sulphide ion
A chemical bond A chemical bond can be defined as a common attraction between two
atoms that results in the simultaneous attraction between their nuclei
and outer electrons
Ideal gas Characteristic of an ideal gas identical particles that have no volume.
Real gases deviate from ideal gas behaviour at high temperature and low pressure.
When atoms move closer than bonding length, to each other the potential energy will increase.
The following quantities of substances represents one mole:
Number of protons in 1 g Hydrogen gas.
The molecular form of a molecule with the formula AB2 is linear or angular.
The boiling point of CH4 is much lower than that of HF.
Explains this difference in boiling point the best = There are hydrogen bonds between HF-
molecules.
1 mol of helium gas at STP has the following volume
2,24 x 104 cm3
@Juffrou_Ansie
, 3
R = An acid
A compound with the formula XO2 has a relative formula mass of 64
Represented by X = Sulphur
CHEMICAL CHANGE: Quantitative aspects of
chemical change
QUESTION EC/NOVEMBER 2020
The term concentration = The simplest whole number ratio of elements in a given
compound.
Calculate the concentration of the sodium hydroxide (NaOH) solution.
@Juffrou_Ansie
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