Which shows the correct reaction profile for an endothermic reaction?

Two solutions are added together. The temperature of the reaction goes down. What type of reaction is this?

• exothermic

• endothermic

Select the correct statement about how the rate changes during the reaction.

• it increases from zero

• it increases, then decreases to zero

• it decreases to zero

• it stays the same

The activation energy for a reaction was measured with and without a catalyst. Select the value that was the value for the catalysed reaction.

• 55 kJ/mol

• 72 kJ/mol

Which of the following is not an example of an endothermic reaction?

• electrolysis

• photosynthesis

• thermal decomposition

• combustion