Topic 1 MC HL Questions

Which diagram represents a heterogeneous mixture?

• 
• 
• 
• 

What is the empirical formula of a hydrocarbon with 75 % carbon and 25 % hydrogen by mass?

• C₃H

• CH₂

• C₂H₆

• CH₄

How many moles of magnesium hydroxide are produced with 0.50 mol of ammonia?

Mg₃N₂ (s) + 6H₂O (l) → 3Mg(OH)₂ (aq) + 2NH₃ (aq)

• 0.25

• 0.33

• 0.75

• 1.5

What is the sum of the integer coefficients when propene undergoes complete combustion?

__C₃H₆ (g) + __O₂ (g) → __CO₂ (g) + __H₂O (l)

• 11

• 17

• 21

• 23

What is the volume of gas when the pressure on 100 cm³ of gas is changed from 400 kPa to 200 kPa at constant temperature?

• 50.0 cm³

• 100 cm³

• 200 cm³

• 800 cm³

Which solution neutralizes 50.0 cm³ of 0.120 mol dm^–3 NaOH (aq)?

• 12.5 cm³ of 0.080 mol dm^–3 H₃PO₄

• 25.0 cm³ of 0.120 mol dm^–3 CH₃COOH

• 25.0 cm³ of 0.120 mol dm^–3 H₂SO₄

• 50.0 cm³ of 0.060 mol dm^–3 HNO₃

What is the pressure, in Pa, inside a 1.0 m³ cylinder containing 10 kg of H₂ (g) at 25 ºC?

B

R = 8.31 J K^–1 mol^–1; pV = nRT

• 
• 
• 
• 

A compound with M_r = 102 contains 58.8 % carbon, 9.80 % hydrogen and 31 % oxygen by mass. What is its molecular formula?

A_r: C = 12.0; H = 1.0; O = 16.0

• C₂H₁₄O₄

• C₃H₄O₄

• C₅H₁₀O₂

• C₆H₁₄O

4.0 g of solid sodium hydroxide is added to 0.10 dm³ of 1.0 mol.dm^-3 aqueous sulfuric acid.

2NaOH(s) + H₂SO₄(aq) → Na₂SO₄(aq) + 2H₂O(l)

Which statement is correct?

• Neither reactant is in excess.

• 0.10 mol Na₂SO₄ is formed.

• Excess H₂SO₄ remains in solution.

• Excess NaOH remains in solution.

Which expression gives the sum of all the coefficients for the general equation for the complete combustion of hydrocarbons?

• A

• B

• C

• D