M_Rates of reaction (concentration only)

How does an increase in concentration of a dissolved reactant affect the rate of reaction?

• Rate of reaction increases
• Rate of reaction decreases
• Rate of reaction does not change
• Rate of reaction stops

Why does an increased concentration of a dissolved reactant increase the rate of reaction?

• The increased concentration means there will be a higher rate of successful collisions between reactants
• The increased concentration means there will be more successful collisions between reactants
• The increased concentration means there will be a higher frequency of successful collisions between reactants
• The increased concentration means there will be a higher rate of collisions between reactants

Experiment to investigate how the rate of reaction varies with the concentration of the dissolved reactant:

• Sodium thiosulphate and hydrochloric acid at different temperatures (wait for X to disappear)
• Hydrochloric and marble chips practical to generate volume of CO₂ produced
• Sodium thiosulphate and hydrochloric acid at different volume ratios of water:acid (wait for X to disappear)
• Hydrogen peroxide with potassium iodide and washing up liquid to see how much foam is produced

How does an increase in pressure of a gaseous reactant affect the rate of reaction?

• Rate of reaction increases
• Rate of reaction decreases
• Rate of reaction does not change
• Rate of reaction stops

Why does an increased pressure of a gaseous reactant increase the rate of reaction?

• The increased pressure means that there will be a higher rate of successful collisions
• The increased pressure means that there will be more successful collisions
• The increased pressure means that there will be a higher frequency of successful collisions
• The increased pressure means that there will be a higher rate of collisions

Which one of these is more concentrated?

• Solution B
• Solution C
• They have the same concentration

Which one of these is more concentrated?

• Solution B
• Solution A
• They have the same concentration

Which one of these is more concentrated?

• Solution D
• Solution E
• They have the same concentration

Which one of these is more concentrated?

• Solution E
• Solution F
• They have the same concentration

Which one of these is more concentrated?

• Solution B
• Solution E
• They have the same concentration