A scientist investigates the energy changes during four different chemical reactions.
She measures the temperature of the reaction mixture at the start and at the end of each reaction.
Her results are shown in the table below.
| Reaction | Temperature at start (∘C^{\circ}\text{C}∘C) | Temperature at end (∘C^{\circ}\text{C}∘C) | Temperature change (∘C^{\circ}\text{C}∘C) | Type of reaction |
|---|---|---|---|---|
| P | 18 | 31 | ......................... | Exothermic |
| Q | 23 | 15 | ......................... | ......................... |
| R | 21 | 37 | ......................... | ......................... |
| S | 17 | 17 | ......................... | No reaction |
a.[6]
Complete the table.
b.[1]
Which reaction has the largest energy change?
c.[2]
Look at the reaction profile below:
Calculate the energy change in this reaction.
d.[2]
Calculate the activation energy of this reaction.