The correct answer is D) takes place if heat is invested.

Endothermic reactions are chemical reactions in which the system absorbs heat from its surroundings. In other words, it requires heat to proceed. This is in contrast to exothermic reactions, which release heat.

Option A is incorrect because not all endothermic reactions occur spontaneously. Whether a reaction is spontaneous or not depends on factors like temperature and the change in Gibbs free energy, not just on whether it's endothermic or exothermic.

Option B is incorrect because endothermic reactions absorb heat, they do not produce it.

Option C is incorrect because combustion reactions are typically exothermic, not endothermic. They release heat, rather than absorbing it.

Option E is incorrect because some endothermic reactions can happen spontaneously under the right conditions.

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The correct answer is D) takes place if heat is invested.

Endothermic reactions are chemical reactions in which the system absorbs heat from its surroundings. In other words, it requires heat to proceed. This is in contrast to exothermic reactions, which release heat.

Option A is incorrect because not all endothermic reactions occur spontaneously. Whether a reaction is spontaneous or not depends on factors like temperature and the change in Gibbs free energy, not just on whether it's endothermic or exothermic.

Option B is incorrect because endothermic reactions absorb heat, they do not produce it.

Option C is incorrect because combustion reactions are typically exothermic, not endothermic. They release heat, rather than absorbing it.

Option E is incorrect because some endothermic reactions can happen spontaneously under the right conditions.

Knowee AI · Accepted Answer

The correct answer is D) takes place if heat is invested.

Endothermic reactions are chemical reactions in which the system absorbs heat from its surroundings. In other words, it requires heat to proceed. This is in contrast to exothermic reactions, which release heat.

Option A is incorrect because not all endothermic reactions occur spontaneously. Whether a reaction is spontaneous or not depends on factors like temperature and the change in Gibbs free energy, not just on whether it's endothermic or exothermic.

Option B is incorrect because endothermic reactions absorb heat, they do not produce it.

Option C is incorrect because combustion reactions are typically exothermic, not endothermic. They release heat, rather than absorbing it.

Option E is incorrect because some endothermic reactions can happen spontaneously under the right conditions.

An endothermic reaction:A) takes place in every case spontaneously.B) produces heat.C) The most common endothermic reactions are combustions.D) takess place if heat is invested.E) never happen spontaneously.

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