QUESTION 1 [20 marks]

Question

Various options are provided as possible answers to the following questions.
Each question has only ONE correct answer. Write only the letter (A–D) next to
the question number (1.1–1.10) in the ANSWER BOOK (your own lined paper).
Question 1.1 [2 marks]
Which ONE of the bonds between the atoms below has the highest
electronegativity difference?
A. H - S
B. H - Br
C. H - F
D. H - O
Question 1.2 [2 marks]
The type of bond formed between an H
+
ion and H2O is called a/an …
A. hydrogen bond.
B. dative covalent bond.
C. ionic bond.
D. covalent bond.
Question 1.3 [2 marks]
The molecular shape of NH3
is...
A. trigonal planar.
B. trigonal/triangular pyramidal.
C. trigonal/triangular bipyramidal.
D. angular.
Question 1.4 [2 marks]
What is the relationship between bond energy and bond length?
A. Directly proportional.
B. Inversely proportional.
C. Equal to each other.
D. Indirectly proportional.
Question 1.5 [2 marks]
The Kelvin temperature of a gas in a closed container is T. The pressure and the
volume of the gas are both halved. The Kelvin temperature of the gas after this
process is:
A. ¼ T
B. 2T
C. ½ T
D. 4T.
Question 1.6 [2 marks]
Which ONE of the following statements CORRECTLY describes the characteristics
of an exothermic reaction?
A. ΔH<0; the products have less potential energy than the reactants.
B. ΔH<0; the products have more potential energy than the reactants.
C. ΔH>0; the products have more potential energy than the reactants.
D. ΔH>0; the products have less potential energy than the reactants.

Answer 1

Here are the answers to the questions:

1.1 C. H - F
1.2 A. hydrogen bond.
1.3 B. trigonal/triangular pyramidal.
1.4 B. Inversely proportional.
1.5 C. ½ T
1.6 A. ΔH<0; the products have less potential energy than the reactants.