Exothermic and endothermic reactions

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Question 1
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Figure 1 shows the reaction profile for the thermal decomposition of calcium carbonate:

calcium carbonate→calcium oxide+carbon dioxide \text{calcium carbonate} \rightarrow \text{calcium oxide} + \text{carbon dioxide} calcium carbonate→calcium oxide+carbon dioxide

Reaction profile representing an endothermic reaction. The vertical axis is labeled 'Energy' and the horizontal axis is labeled 'Progress of reaction'. A flat line on the left at a lower energy level is labeled P. From P, the curve rises to a peak and then descends to a flat line on the right at a higher energy level, labeled S. A vertical arrow pointing from the level of P to the peak of the curve is labeled Q. A vertical arrow pointing from the level of P to the level of S is labeled R.

Based on Figure 1, answer the following:

a.

Which label represents the activation energy?

[1]
b.

Which label represents the energy of the reactant (calcium carbonate)?

[1]
c.

What type of chemical reaction is this, since it takes in energy from the surroundings?

[1]

Exothermic and endothermic reactions Questions

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