Practise measuring reaction rates and explaining how collision frequency, activation energy and catalysts affect them, then interpret experimental data and reaction pathway…
A student carries out four experiments to investigate the rate of reaction between 3.0 g of calcium carbonate and hydrochloric acid.
experiment powder at
experiment powder at
experiment 3 large chips of at room temperature
experiment 4 large chips of at
The student collects the and times how long it takes to produce the same volume of gas for each experiment.
What could be the correct times for the four experiments?
experiment 1 /s
experiment 2 /s
experiment 3 /s
experiment 4 /s
5
10
30
95
5
10
95
30
5
30
95
10
95
30
10
5
For a certain endothermic reaction, the activation energy is numerically equal to twice the enthalpy change of reaction.
Which reaction pathway diagram is correct for this reaction?
The Boltzmann distribution for the hydrogenation of an alkene at a particular temperature in the absence of a catalyst is shown.
Which row correctly describes the effects of adding a nickel catalyst to the reaction vessel?
the shape of the Boltzmann distribution
activation energy,
changes
decreases
changes
increases
does not change
decreases
does not change
increases
The decomposition of hydrogen peroxide in the presence of produces water and oxygen gas.
The volume of gas collected when 0.2 g of is added to two different hydrogen peroxide solutions at is shown on the graph as curves X and Y .
Which row shows the conditions that will result in curves X and Y ?
volume of
concentration of
form of
volume of
concentration of
form of
50
0.1
lumps
50
0.2
powder
25
0.2
powder
25
0.1
lumps
50
0.1
lumps
20
0.2
powder
20
0.2
powder
40
0.1
lumps