QCAA Multiple Choice Practice Questions for Unit 3 & 4 Chemistry External Assessment

Question 6

According to the reactivity series in the Formula and data book, determine the correct order for the following metals from most reactive to least reactive.

(a) Ni, Li, Fe

(b) Bi, Cu, Ca

(c) Al, Mn, Co

(d) Au, Ag, Ni

Question 7

Determine which of the following is an isomer of the structure shown below.

Image sourced from Oxford Chemistry for Queensland Units 3 & 4

(a) propane

(b) 2-methylpropane

(c) butane

(d) 2-methylbutane

Question 8

Predict the effect that increasing volume at time = 18mins will have on the reaction below.

Image sourced from Dynamic Science

(a) The system will partially oppose the change by moving to the product side to decrease the reactant concentration, resulting in a net forward reaction

(b) The system will partially oppose the change by moving to the reactant side to decrease the reactant concentration, resulting in a net forward reaction

(c) The system will partially oppose the change by moving to the product side to decrease the reactant concentration, resulting in a net reverse reaction

(d) The system will partially oppose the change by moving to the reactant side to decrease the product concentration, resulting in a net reverse reaction

Question 9

Determine the E° value of a Mg2+/Mg and Cu2+/Cu galvanic cell.

(a) 2.71V

(b) 2.22V

(c) 2.4V

(d) 2.7V

Question 10

Predict the effect that adding a catalyst at time = 5 mins would have had on the reaction below.

Image sourced from Dynamic Science

(a) The system will partially oppose the change by moving to the product side to decrease the reactant concentration, resulting in a net forward reaction

(b) No effect on equilibrium

(c) The system will partially oppose the change by moving to the product side to decrease the reactant concentration, resulting in a net reverse reaction

(d) Both the forward and reverse reactions will speed up equally

Question 11

The graph below shows the titration between a strong acid and a strong base. What was the initial concentration of H+ ions in the acid?

Image sourced from Chem.ubc.ca

(a) 0.1

(b) 0.01

(c) 0.001

(d) 1

Question 12

Which of the options below correctly demonstrates oxidation of a primary alcohol?

(a) alcohol → ketone

(b) alcohol → aldehyde → carboxylic acid

(c) alcohol → carboxylic acid

(d) alcohol → ketone → carboxylic acid

Question 13

Which of the following pH indicators is most appropriate to use to detect the end point of the titration curve below?

Image sourced from Chem.ubc.ca

(a) Phenolphthalein

(b) Phenol Red

(c) Methyl Red

(d) Bromothymol Blue

Question 14

A galvanic electrochemical cell

(a) is non-spontaneous

(b) requires and external energy source

(c) converts chemical energy into electrical energy

(d) anode is positive and cathode is negative

Question 15

Deduce which of the following is a diprotic acid.

(a) H₂SO₄

(b) HNO₃

(c) CH₃COOH

(d) HCl

Question 16

Determine the correct statement regarding equivalence point and end point.

(a) equivalence point occurs after the end point

(b) a pH indicator changes colour at the equivalence point

(c) the number of moles of titrant and analyte are equal at the equivalence point

(d) a pH indicator changes colour at the half- equivalence point

Question 17

At equilibrium, a 1.00 L vessel contains 0.04 mol of H₂, 0.06 mol of I₂, and 0.35 mol of HI. The system is represented by the equation below. Determine, to two decimal places, the equilibrium constant (K_c) for this reaction.

H₂(g) + I₂(g) ⇌ 2HI(g)

(a) K_c = 50.04

(b) K_c = 40.05

(c) K_c = 40.04

(d) K_c = 51.04

Question 18

For the graph below, identify how many times the system equilibrium has been disturbed.

Image sourced from Dynamic Science

(a) 2

(b) 3

(c) 4

(d) It has not been disturbed

Question 19

Which of the following organic compounds contains a hydroxyl functional group?

(a) Alcohol

(b) Amide

(c) Nitrile

(d) Aldehyde

Question 20

What is the oxidation number of sulfur in H₂SO₄?

(a) -6

(b) +3

(c) -3

(d) +6

Question 21

The final shape of a protein molecule is known as its

(a) Primary structure

(b) Secondary structure

(c) Tertiary structure

(d) Final structure

Question 22

Determine the equilibrium constant for the following reaction.

2ClF₃(g) ⇄ 3 F₂(g) + Cl₂(g)

Question 23

A condensation reaction is when

(a) Bonds are broken in double/triple bond of hydrocarbon and in covalent bond of second molecule

(b) One substituent on a saturated carbon chain is replaced by another substituent

(c) Substituents are removed from two adjacent carbon atoms in a haloalkane to form multiple bonds

(d) Two molecules combine to form a larger molecule and H₂O

Question 22

Calculate the atom economy for H₂O as the desired product in the following reaction.

CH₄(g) + 2O₂(g) →  2H₂O(g) + CO₂(g)

(a) 40%

(b) 4%

(c) 45%

(d) 50%

Question 25

Determine the order of the following intermolecular forces from strongest to weakest.

(a) hydrogen bonds, dipole-dipole interactions, dispersion forces

(b) dipole-dipole interactions, dispersion forces, hydrogen bonds

(c) hydrogen bonds, dispersion forces, dipole-dipole interactions

(d) none of the above

Solutions to Chemistry EA Multiple Choice Practice Questions

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