Energy in Chemical Reactions — Test

Question 4 • Chemistry

Which reaction is endothermic?

Answer

2 Na plus Cl sub 2 rightarrow 2 NaCl plus energy

HCl plus NaOH rightarrow NaCl plus cap h sub 2 cap o plus 58 kJ

6 CO sub 2 plus 12 cap h sub 2 cap o plus energy rightarrow cap c sub 6 cap h sub 12 cap o sub 6 plus 6 cap o sub 2 plus 6 cap h sub 2 cap o

2 cap c sub 2 cap h sub 6 plus 7 cap o sub 2 rightarrow 4 CO sub 2 plus 6 cap h sub 2 cap o plus 2 comma 502 KJ

Explanation

An endothermic reaction absorbs energy, so energy appears on the reactant side. In choice A, energy is added along with carbon dioxide and water to produce glucose and oxygen, so this reaction is endothermic. In choices B, C, and D, energy or heat is shown among the products, indicating that those reactions release energy.

AI-written and checked against the verified answer.

More from this Course

Test

Test

Test