What name is given to the amount of energy needed by particles for them to react when they collide?
Activation energy
Catalytic energy
Exothermic energy
What piece of apparatus could be used to measure the volume of gas produced in a reaction?
Gas syringe
Beaker
Top pan balance
Which of the following is a possible unit for rate of reaction?
m/s
cm3/s
cm3
Which of the following would speed up a reaction?
Using lumps instead of powder
Increasing the concentration of an acid
Decreasing the temperature
Which of the following will increase the frequency of successful collisions?
Increasing the temperature
Decreasing the pressure
Decreasing the concentration
Which of the following has the smallest surface area to volume ratio?
Powder
Gauze
Lumps
Which of the following statements explains why an increase in the acid concentration, increases the rate of reaction between magnesium and sulfuric acid?
The reaction is faster because the reacting particles have more energy
The reaction is faster because the reacting particles collide more often
The reaction is faster because the reacting particles have more space
Which of the following statements about catalysts is false?
They speed up reactions
They provide an alternative reaction pathway with a lower activation energy
They become chemically changed at the end of the reaction
When a dilute acid is added to sodium thiosulphate solution a precipitate of sulfur slowly forms. Which of the following measurements could be made to compare the rates of this reaction using different concentrations of acid?
Measure the time taken for a cross drawn under the beaker to disappear
Measure how the mass of beaker changes with time
Measure the time taken for the reaction to be completed
Which of the following would give a steeper curve on a graph of volume of gas produced against time?
Low temperature
Low concentration
Using a catalyst