Question

Read the passage about a chemical reaction that causes a change in temperature. Then, follow the instructions below.
The most common type of cement in the world is Portland cement, named after an area of England that has a lot of limestone. Limestone is made up mostly of calcium carbonate
(CaCO3)
. When calcium carbonate is heated, it breaks down into carbon dioxide
(CO2)
and calcium oxide
(CaO)
, the main ingredient in Portland cement. As the products form, the air around the reaction becomes cooler.
Select the true statement.



This chemical reaction is exothermic. It converts chemical energy to thermal energy, which is released into the surroundings.

This chemical reaction is endothermic. It chemical energy to thermal energy, which is released into the surroundings.

Answer 1

The true statement is:

This chemical reaction is endothermic. It converts chemical energy to thermal energy, which is released into the surroundings.

In an endothermic reaction, energy is absorbed from the surroundings, which can cause the surrounding environment to become cooler, as described in the passage.