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This quiz pulls questions at random from the entire 1100+ question-bank

1. What will happen to the equilibrium position when we increase temperature? Give a reason for your prediction. 2A (s) + B (g) ⇋ C (g) + D (g) (-∆H)

Equilibrium will move to the left because the forward reaction is endothermic

Equilibrium will move to the right because the forward reaction is exothermic

Equilibrium will shift to the left, because the forward reaction is exothermic

Equilibrium will move to the right because the forward reaction is endothermic

Question 1 of 10

2. Explain how crude oil is separated into fractions

Crude oil is separated by fractional distillation. Crude oil is heated and the oil evaporates. It then goes into the tower. As the vapours rise up the tower the temperature falls. Different sized fractions condense at different heights because they have different boiling points. Smaller molecules condense high up in the tower. Larger molecules condense low down in the tower. Then the fractions are collected.

Crude oil is separated by fractional distillation. Crude oil is heated and the oil evaporates. It then goes into the tower. As the vapours rise up the tower the temperature falls. Different sized fractions condense at different heights because they have different boiling points. Larger molecules condense high up in the tower. Smaller molecules condense low down in the tower. Then the fractions are collected.

Crude oil is separated by fractional distillation. Crude oil is heated and the oil evaporates. It then goes into the tower. As the vapours rise up the tower the temperature rises. Different sized fractions condense at different heights because they have different boiling points. Smaller molecules condense high up in the tower. Larger molecules condense low down in the tower. Then the fractions are collected.

Crude oil is separated by fractional distillation. Crude oil is heated and the oil evaporates. It then goes into the tower. As the vapours rise up the tower the temperature rises. Different sized fractions condense at different heights because they have different boiling points. Larger molecules condense high up in the tower. Smaller molecules condense low down in the tower. Then the fractions are collected.

Question 2 of 10

3. What will happen to the rate of reaction when a catalyst is added? A (g) + B (g) ⇋ C (g) + D (g) (+∆H)

decrease

remain constant

increase

it depends on the conditions

Question 3 of 10

4. Are non-metal oxides acidic or basic?

Basic

Depends on conditions

Neutral

Acidic

Question 4 of 10

5. Describe the observations of the reaction of calcium carbonate and dilute hydrochloric acid

no reaction

fizzing and solid disappears

fizzing, solid moves around, solid melts, solid disappears and solid floats

fizzing, solid disappears, solid floats, lilac flame seen

Question 5 of 10

6. Is ammonium sulfate soluble?

slightly

yes

Question 6 of 10

7. Describe the structure of an ionic compound, e.g NaCl

A giant structure held together by intermolecular forces

A giant structure held together by the attraction between positive metal ions and a sea of delocalised electrons

A giant structure held together by the attraction between oppositely charged ions

A giant structure held together by the attraction between similarly charged ions

Question 7 of 10

8. What will happen to the yield of CH₃OH when the pressure is increased? Give a reason for your prediction. CO(g) + 2H₂(g) ⇋ CH₃OH(g) ΔH = –91 kJ mol⁻1

Decreases because there are more molecules on the right hand side

Increases because there are fewer molecules on the right hand side

Decreases because there are more molecules on the left hand side

Increases because there are fewer molecules on the left hand side

Question 8 of 10

9. What is meant by the term empirical formula?

A method of calculating the ratios of masses in an equation

A chemical formula that shows the actual numbers of the different types of atoms in a molecule

Baby food for emperors

A chemical formula that shows the simplest ratio of the numbers of atoms in a compound

Question 9 of 10

10. Balance the following equation: WO₃ + H₂ → W + H₂O

WO₃ + 6H₂ → W + 3H₂O

WO₃ + 3H₂ → W + 6H₂O

WO₃ + 3H₂ → W + 3H₂O

2WO₃ + 3H₂ → 2W + 6H₂O

Question 10 of 10

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