IGCSE 0620 Rate of reaction, Haber & Contact process

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

Tags

NGSS.HS-PS1-5

Which list contains only chemical changes?

• boiling, condensing, distillation

• neutralisation, addition reaction, combustion

• rusting, freezing, subliming

• melting, evaporating, dissolving

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

Tags

NGSS.HS-PS1-5

A new gas is produced when calcium carbonate is heated. Which type of change is this?

• Physical change

• Chemical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How is nitrogen obtained for haber process

• by fractional distillation of liquid air

• burning sulfide ores

• combustion of petroleum

• reaction of methane and steam

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.

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.

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

____________ is the is the minimum energy that colliding particles must have to react

• Activation energy

• Enthalpy change

• Catalyst

• Enzyme

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.

Tags

NGSS.HS-PS1-5