Question

Imagine a graph. The x-axis is labeled “time” and is measured in seconds, and the y axis is labeled “potential energy” and is measured in kilojoules. The slope starts at 0 seconds with a plateau at 25 kj. This plateau is labeled as “reactants”. The slope then rises to a peak labeled “activation energy” at 78 kj. Finally the slope drops to a plateau at 14 kj and is labeled “products”.

What does the graph described above represent?

A. Rate of reaction graph
B. An endothermic reaction
C. A phase change graph
D. An exothermic reaction

Answer 1

d because the products are lower energy than the reactants.

Answer 2

D
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