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This is the O-Level Combined Science question paper. Use it for exam practice under timed conditions.
1. In most cases, an atom strives to have an outer energy level with..
Unit assess
C 6 electrons
A 8 electrons
D 2 electrons
(1)
2. The probability of an ionic bond to be formed is greatest between ...
B 10 electrons
A C and O
B Mg and Mg
C Ca and Cl
(1)
D F and F
3. A characteristic of covalent bonding is the formation of ...
A metals
B non-metals
C ions
(1)
D molecules
4. Between which pair of atoms will the formation of a covalent bond be the greatest possibility?
A Mg and Cl
B Ca and Ca
C H and O
D K and Cl
(1)
5. When an atom gains an electron, it forms a/an ...
A cation
B anion
C proton
D neutron
(1)
6. Identify the type of bonding that occurs in each of the following substances:
a KF
b $\mathrm{H}_{2} \mathrm{~S}$
(1)
c CaF
(1)
d lithium oxide
(1)
e CO
(1)
7. When sodium hydroxide and copper sulphate solutions are added to each other, a solid blue substance is formed.
a What type of reaction is this?
b What type of substance is formed?
(1)
c Write balanced word and chemical equations for the reaction.
(1)
For each reactant and product, state if they are liquids or solids. (8)
Total: 20
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