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Q1— Section header —
1.5n the ANSWER BOOK.
1.1roup of elements having properties of metals and non metals, some of which are useful in semiconductors and electronic components
1.2Cycle that involves the continuous movement of water on, above and bel ow the surface of the earth.
1.3phere that helps to regulate temperature on earth
1.4rocess in which a substance dissolves in water
1.55
Q2— Section header —
2.5roperty that determines how easily a liquid flows roup of elem ent known as alkali metals Cooling of gases until they
Q3— Section header —
3.1.5\ in the ANSWER BOOK. .1 Magnesium bicarbonate causes permanent hardness in water. .2 Relative density refers to the density of a substance compared to the density
Q5— Section header —
5.1Refer to the table above and write down the ph ase/state of each substance at each of the following:
5.1.4
5.2Define the term boiling point (2\
5.3Explain the strength of the forces between the mo lecules of A and t hat of B? (4\ [10]10
Q6— Section header —
6.1Draw the structure of an atom. Clearly show the protons, neutrons and electrons (6\
6.2Consider the element
6.2.1Is beryllium an element or a compound? (1\
6.2.2Justify your answ er in Q UESTION
6.2.1(3\
6.2.3Give the name of the group in the periodic table to which beryllium belongs (1\
6.2.4Name TWO physical properties of t he elements found in this group. (2\
6.3Write down the s p notations to show the elec tron distribution of an
6.3.1Aluminium atom
6.3.2
6.4Give an example to describe the covalent bonding between TWO atoms (4\
6.5Write down the chemical name of each of the following compounds:
6.5.1Washing soda
6.5.225
Q7— Section header —
7.1Temperature is measured in the SI units Kelvin (K\nd degree Celcius ( C\
7.1.1Name the instrument used to measure temperature (1\
7.1.2Which tempe rature scale designates the freezing point as 100 (1\
7.1.3Define absolute temperature (2\
7.1.4Convert 263 K to (2\
7.2
7.3Use a re action to differentiate between physical and a chemical change (4\
7.4State whether each change w ill be physical or chemical
7.4.1Boiling water
7.4.2Food decaying
7.4.3Mashing potatoes
7.4.4
7.5A c pper sulphate solution is added t o a s lution of calcium cloride. Expl ain whether or not
Q8— Section header —
8.1Define solution and give ONE example (4\
8.2Calculate the formula mass of each of the following:
8.2.1Fe(NO
8.2
8.3Cal culate the number of grams in 2, 5 moles of Na CO (4\ (10021002\
8.4Calculate the concentration of each of the following:
8.4.150 g of magnesium chloride in 250 m of solution
8.4.2
8.5Corrosion occurs when something is destroyed progressively by chemical action.
8.5.1Write the balanced chemical equation when iron reacts with air to form rust (4\
8.5.228
Q9— Section header —
9.1arth is the only known planet in the universe where life can be supported List and briefly describe the FOUR global systems that arth is
9.2
Q10— Section header —
10.1In South Afric a, fresh water is our most limit ed resource
10.1.1List FIVE places on arth where water is found (5\
10.1.2What is the biggest limitation to the development of South Africa? (2\
10.2Write the equation to represent the formation of acid rain (4\
10.3Dams are very important f or water stor in order to meet the n eeds of local