NSC Physical Sciences Organic Compounds and Macromolecules: QUESTION 1: MULTIPLE-CHOICE QUES

Question

QUESTION 1: MULTIPLE-CHOICE QUESTIONS

Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, e.g. 1.11 E.

1.1 Which formula shows the way in which atoms are bonded in a molecule but does not show all the bond lines?
A. Empirical
B. Molecular
C. Structural
D. Condensed structural

1.2 Which ONE of the following compounds has hydrogen bonds between its molecules?
A. CH3(CH2)2CH3
B. CH3COCH2CH3
C. CH3CH(OH)CH2CH3
D. CH3CH(OH)CH2CH2CH3

1.3 Consider the compound below.

CH3
  |
CH3–CH–CH2–O–CH3
  |
  H

Which ONE of the following is the IUPAC name of this compound?
A. 2-methylpentan-3-one
B. 4-methylpentan-3-one
C. 2,3-dimethylbutan-2-one
D. 2,2,4-trimethylpropan-2-one

1.4 A 2 g piece of magnesium reacts with EXCESS hydrochloric acid according to the following balanced equation:
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
Which ONE of the following changes will INCREASE the YIELD of H2(g)?
A. Crush the piece of magnesium.
B. Use a 3 g piece of magnesium.
C. Use a greater volume of the acid.
D. Use a higher concentration of the acid.

1.6 The expression for the equilibrium constant (Kc) of a hypothetical reaction is given as follows:
Kc = [X]^3[Y]^{-2}[Z]
Which ONE of the following equations for a reaction at equilibrium matches the above expression?
A. Z(g) + 2Y(g) ⇌ 3X(s)
B. Z(aq) + 2Y(aq) ⇌ 3X(aq)
C. Z(g) + Y2(g) ⇌ 3X(aq) + Q(s)
D. Z(aq) + 2Y(aq) ⇌ 3X(aq) + Q(s)

1.7 Two dilute acids of equal concentrations are added to separate test tubes as shown below.

100 cm³ HCl(aq)

100 cm³ CH3COOH(aq)

Consider the following statements regarding these acids:
I: The pH of each is less than 7.
II: Both will react at the same rate with 5 g of magnesium powder.
III: Both will neutralise the same number of moles of NaOH(aq).
Which of the statements above is/are TRUE?
A. I only
B. I, II and III
C. I and III only
D. II and III only

1.8 Which ONE of the following is the conjugate base of H3PO4?
A. PO4^3−
B. HPO4^2−
C. H2PO4−
D. HPO4^−

QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions - NSC Physical Sciences - Question 1 - 2021 - Paper 2

Worked Solution & Example Answer:QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions - NSC Physical Sciences - Question 1 - 2021 - Paper 2

1.1 Which formula shows the way in which atoms are bonded in a molecule but does not show all the bond lines?

1.2 Which ONE of the following compounds has hydrogen bonds between its molecules?

1.3 Which ONE of the following is the IUPAC name of this compound?

1.4 Which ONE of the following changes will INCREASE the YIELD of H2(g)?

1.6 Which ONE of the following equations for a reaction at equilibrium matches the above expression?

1.7 Which of the statements above is/are TRUE?

1.8 Which ONE of the following is the conjugate base of H3PO4?

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