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    Answer 4 questions correctly in a row.

When a chemical reaction absorbs or releases thermal energy, the reaction causes a change in temperature. Read the passage about a chemical reaction that absorbs or releases thermal energy. Then, follow the instructions below.
As part of the Apollo program, 12 astronauts walked on the surface of the Moon between 1969 and 1972. Apollo spacecraft were launched into space using Saturn V, a powerful rocket fueled in part by a mixture of liquid hydrogen 
(
H
2
)
 and liquid oxygen 
(
O
2
)
. When this mixture is lit, water vapor 
(
H
2
O
)
 forms and a huge amount of thermal energy flows into the surroundings. This energy carried the spacecraft into orbit.
Complete the statement.
During this chemical reaction, the 
air around the reaction
 becomes 
warmer

.
ref_doc_title.

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