10 CHM Data Test Reaction Rates

What type of reaction is this?

• Endothermic
• Exothermic
• single replacement

• synthesis

• decomposition

The graph below shows how the concentrations of reactants and products change during a chemical reaction. Which of the chemical species is likely to be the reactant?

• A, blue

• B, red

• C, green

The graph below shows how the concentration of a reactant in four different reactions changes over time. Which reaction is the slowest?

• A, blue

• B, red

• C, green

• D, purple

Enzymes:

• only function at a temperature of 37°C and a pH of 1.5.

• are always flexible and can change their structure depending on the substrate.

• are proteins that catalyse chemical processes in plants and other organisms.

• are used up in biochemical reaction and the body constantly needs to produce more.

How many transition states does the catalysed and uncatalyzed reaction have?

• TS (catalysed) = 1 and TS (uncatalysed) = 0

• TS (catalysed) = 1 and TS (uncatalysed) = 1

• TS (catalysed) = 2 and TS (uncatalysed) = 1

• TS (catalysed) = 2 and TS (uncatalysed) = 2

How do the purple and green curve differ if both are for the same particles?

• The purple curve is without catalyst.

• The purple curve has a higher average kinetic energy.

• The purple curve has a lower activation energy.

• The purple curve is at a lower temperature.

Identify the range below with the highest rate of reaction from the graph.

• 9–10 minutes

• 3–6 minutes

• 1–11 minutes

• 0–3 minutes

The graph shows how the total volume of a gas given off from a reaction changes with time. In which time interval is least gas given off?

• A

• B

• C

• D

An experiment with a reaction mixture of carbonate and acid in a container was placed on an electronic balance. The mass of reactants and container was measured at regular time intervals. A graph of the mass reading against time was plotted. Which curve was obtained?

• A

• B

• C

• D

Graph E represents the rate of volume of gas formed from the original experiment. Which graph best represents the same experiment conducted at a lower temperature?

• W

• X

• Y

• Z