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Chemistry
9th -
12thgrade
IGCSE 0620 Rate of reaction, Haber & Contact process
15 questions
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- 1. Multiple Choice
Which change will increase the rate of a chemical reaction?
increasing the size of the pieces of copper(II) carbonate
increasing the volume of sulfuric acid
increasing the concentration of sulfuric acid
decreasing the surface area of pieces of copper(II) carbonate
- 2. Multiple Choice
Which list contains only chemical changes?
boiling, condensing, distillation
neutralisation, addition reaction, combustion
rusting, freezing, subliming
melting, evaporating, dissolving
- 3. Multiple Choice
Which change in reaction conditions increases both the collision rate and the proportion of molecules with sufficient energy to react?
addition of a catalyst
increasing the concentration of a reactant
increasing the surface area of a reactant
increasing the temperature of the reaction
- 4. Multiple Choice
A new gas is produced when calcium carbonate is heated. Which type of change is this?
Physical change
Chemical change
- 5. Multiple Choice
How is nitrogen obtained for haber process
by fractional distillation of liquid air
burning sulfide ores
combustion of petroleum
reaction of methane and steam
- 6. Multiple Choice
The Contact process is used for the manufacture of sulfuric acid.
Which statement about this process is not correct?
A catalyst of iron is used
The temperature used is around 450°C.
Lower pressure is used
Oxygen from the air is used to react with sulfur dioxide.
- 7. Multiple Choice
Which statement about catalysts in chemical reactions is NOT correct?
Catalysts are unchanged at end of reaction
Catalysts increase the energy of the reacting particles.
Catalysts increase the rate of the reaction.
Catalysts lower the activation energy.
- 8. Multiple Choice
Which change is a physical change?
thanol reacts with oxygen to form carbon dioxide and water.
Copper(II) carbonate changes colour from green to black when it is heated, and stays black when it cools.
Ice forms liquid water when it is heated.
Hydrogen peroxide decomposes into water and oxygen when it is heated strongly
- 9. Multiple Choice
____________ is the is the minimum energy that colliding particles must have to react
Activation energy
Enthalpy change
Catalyst
Enzyme
- 10. Multiple Choice
When happens when concentration of reactant is increased?
particles get more (kinetic) energy and move faster.
more surface is exposed to collision
activation energy is decreased
the number of particles in unit volume will increase.
- 11. Multiple Choice
Why rate of reaction is fastest at beginning of reaction?
there is higher concentration of reactants to react.
the reactants are getting used up.
temperature is highest at the beginning
the gradient is less steeper
- 12. Multiple Choice
What is the color change for following reaction
CuSO4.5H2O ⇌ CuSO4 + 5H2O
White to blue
Blue to white
Pink to blue
Blue to pink
- 13. Multiple Choice
What is the color change for following reaction
CoCl2 + 6H2O ⇌ CoCl2.6H2O
Blue to pink
Pink to blue
White to Blue
Blue to white
- 14. Multiple Choice
Which of the following is NOT a condition for Haber process?
Temperature: 450°C
Pressure: 200atm
Pressure: 2atm
Catalyst: Iron
- 15. Multiple Choice
Why a higher pressure is NOT used even if it gives good yield of ammonia in Haber process.
At low pressure, reaction is fast enough
At low pressure, almost all of the ammonia is produced
Higher pressure is expensive and there is danger of vessels bursting
It is not feasible
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