Question

An exothermic reaction has A) a negative ΔH, absorbs heat from the surroundings, and feels cold to the touch. B) a positive ΔH, gives off heat to the surroundings, and feels warm to the touch. C) a negative ΔH, gives off heat to the surroundings, and feels warm to the touch. D) a positive ΔH, absorbs heat from the surroundings, and feels cold to the touch. E) a positive ΔH, absorbs heat from the surroundings, and feels warm to the touch.

Answer 1

Answer:

Option C: a negative ΔH, gives off heat to the surroundings, and feels warm to the touch

Explanation:

Step 1:

An exothermic reaction  = a reaction that gives off heat to the surroundings.

There is a temperature raise.

A) a negative ΔH, absorbs heat from the surroundings, and feels cold to the touch.

This is false. since there is a temperature raise, it doesn't feel cold to the touch, and gives off heat to the surroundings.

B) a positive ΔH, gives off heat to the surroundings, and feels warm to the touch.

This is false. An exothermic reaction has a negative  ΔH.

C) a negative ΔH, gives off heat to the surroundings, and feels warm to the touch. This is correct

D) a positive ΔH, absorbs heat from the surroundings, and feels cold to the touch.

This is false. An exothermic reaction doesn't absorb heat from the surroundings, it doesn't feel cold to the touch.

E) a positive ΔH, absorbs heat from the surroundings, and feels warm to the touch.

This is false. An exothermic reaction doesn't have a positive ΔH.