For which of these processes is the value of ΔH expected to be negative?
I. The temperature (of water) increases when calcium chloride dissolves in water
II. Steam condenses to liquid water
III. Water freezes
IV. Dry ice sublimes

A.) IV only
B.) I, II, and III
C.) I only
D.) II and III only

change in enthalpy orΔH of a reaction is positive when that reaction is endothermic.That when a reaction proceed by the consumption of heat then the enthalpy change for that reaction is positive.

from that point of view

The option 2 steam condenses to liquid water and the option 4 water freezes is the correct answer.

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For which of these processes is the value of ΔH expected to be negative? I. The temperature (of water) increases when calcium chloride dissolves in water II. Steam condenses to liquid water III. Water freezes IV. Dry ice sublimes A.) IV only B.) I, II, and III C.) I only D.) II and III only

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For which of these processes is the value of ΔH expected to be negative?
I. The temperature (of water) increases when calcium chloride dissolves in water
II. Steam condenses to liquid water
III. Water freezes
IV. Dry ice sublimes

A.) IV only
B.) I, II, and III
C.) I only
D.) II and III only