A student investigates the energy changes during some chemical reactions.
She measures the temperature at the start and end of each reaction.
Look at her results.
| 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 |
|---|---|---|---|---|
| W | 19 | 27 | ......................... | Exothermic |
| X | 22 | 13 | ......................... | ......................... |
| Y | 20 | 38 | ......................... | ......................... |
| Z | 15 | 15 | ......................... | No reaction |
a.[4]
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.