Page 44 - Q & A STPM 2022 Chemistry

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Kertas Model STPM 962/1
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Section A
1. B 2. D 3. A 4. D 5. B
6. B 7. A 8. B 9. D 10. B
11. C 12. A 13. D 14. C 15. C
Section B
16. (a) Solid Giant Giant Simple
type metallic Giant ionic covalent covalent
van der
Waals and/
Bonding Metallic Ionic Covalent
or Hydrogen
bonds
Sodium Silicon
Example Copper Water
chloride dioxide
(b) (i) Cl N Cl Cl B Cl

Cl Cl
(ii) NCl : Trigon pyramidal
3
BCl : Trigonal planar
3
17. (a) NH ion donates a proton to NH .
–
+
4
2
NH is a Brønsted-Lowry acid and NH is a Brønsted-Lowry base.
–
+
4
2
(b) 39 g NaNH reacts with 50.5 g NH Cl.
4
2
4.12 g will react with 4.12 × 50.5 g NH Cl = 5.33 g NH Cl
39 4 4
The limiting reagent is NaNH .
2
4.12
Volume of NH produced = × 2 × 22.4 dm 3
3 39
= 4.73 dm 3
Section C
18. (a) The assumptions are:
The size of the gas molecules is negligible compared to the volume of
the container where the gas is placed. There is no intermolecular forces
(attractive or repulsive) between the gas molecules.
These assumptions are valid for a real gas only if the gas is under very low
pressure and/or very high temperature.
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08 Ans STPM Q&A Chem T1 Layout.indd 539 4/19/19 10:48 AM