IB Chemistry Mock Exam Review #1

Which one of the following is the electron arrangement of the strongest reducing agent?

• 1s² 2s² 2p⁵

• 1s² 2s² 2p⁶ 3s²

• 1s² 2s² 2p⁶ 3s² 3p⁵

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

The removal of silicon dioxide with limestone in the Blast Furnace can be represented by the following equation.

CaCO₃(s) + SiO₂(s) → CaSiO₃(l) + CO₂(g)

The minimum mass of calcium carbonate needed to remove 1.00 tonne (1000 kg) of silicon dioxide is

• 0.46 tonne

• 0.60 tonne

• 1.67 tonne

• 2.18 tonne

The removal of silicon dioxide with limestone in the Blast Furnace can be represented by the following equation.

CaCO₃(s) + SiO₂(s) → CaSiO₃(l) + CO₂(g)

The volume of carbon dioxide, measured at 298 K and 1.01 × 10⁵ Pa, formed in this reaction during the removal of 1.00 tonne (1000 kg) of silicon dioxide is

• 24.5 dm³

• 408 dm³

• 24.5 m³

• 408 m³

Which one of the following statements is not correct?

• The atomic radii of Period 3 elements decrease from sodium to chlorine.

• The hydroxides of Group II metals increase in solubility as the group is descended.

• In water, aluminium chloride is hydrolysed more than magnesium chloride.

• SiO₂ has a higher melting point than P₄O₁₀ because of stronger London dispersion forces.

Molecules with a permanent dipole include

1 NH₃

2 PCl₃

3 SCl₂

4 SiCl₄

• 1, 2 and 3 only are correct.

• 1 and 3 only are correct.

• 2 and 4 only are correct.

• 4 only is correct.

The percentage by mass of the elements in a compound is

C=72%, H=12%, O=16%.

What is the mole ratio of C : H in the empirical formula of this compound?

• 1:1

• 1:2

• 1:6

• 6:1

Which of the reactions below occur as written?

I. Br₂ +2I⁻ →2Br⁻ +I₂

II. Br₂ +2Cl⁻ →2Br⁻ +Cl₂

• I only

• II only

• Both I and II

• Neither I nor II

Based on electronegativity values, which bond is the most polar?

• B⎼C

• C⎼O

• N⎼O

• O⎼F

Which of the quantities in the enthalpy level diagram below is (are) affected by the use of a catalyst?

• I only

• III only

• I and II only

• II and III only

In the reaction below

N₂(g)+3H₂(g) →2NH₃(g) ∆H =−92kJ

which of the following changes will increase the amount of ammonia at equilibrium?

I. Increasing the pressure

II. Increasing the temperature

III. Adding a catalyst

• I only

• II only

• I and II only

• II and III only