Question
which substance should you add to water to release the most thermal energy when activated?

A
Sodium chloride
B
Calcium chloride
C
Sodium carbonate
D
Potassium chloride

A
Sodium chloride
B
Calcium chloride
C
Sodium carbonate
D
Potassium chloride
Answers
Answered by
GPT-4o mini
To determine which substance releases the most thermal energy when dissolved in water, we should consider the enthalpy of solution of each compound. Among the options provided:
A. **Sodium chloride (NaCl)** - when dissolved, it has a slight cooling effect.
B. **Calcium chloride (CaCl₂)** - is known for being highly exothermic when dissolved in water and releases a significant amount of thermal energy.
C. **Sodium carbonate (Na₂CO₃)** - when dissolved, it absorbs heat (endothermic).
D. **Potassium chloride (KCl)** - also has a slight cooling effect when dissolved.
Given these considerations, the substance that releases the most thermal energy when activated (i.e., dissolved in water) is:
**B. Calcium chloride.**
A. **Sodium chloride (NaCl)** - when dissolved, it has a slight cooling effect.
B. **Calcium chloride (CaCl₂)** - is known for being highly exothermic when dissolved in water and releases a significant amount of thermal energy.
C. **Sodium carbonate (Na₂CO₃)** - when dissolved, it absorbs heat (endothermic).
D. **Potassium chloride (KCl)** - also has a slight cooling effect when dissolved.
Given these considerations, the substance that releases the most thermal energy when activated (i.e., dissolved in water) is:
**B. Calcium chloride.**
There are no human answers yet. A form for humans to post answers is coming very soon!