Question

evaporation rate
various compounds
the data below shows the change in temperature when 4 compounds are exposed to room temperature air over 2 minutes.

compound	temperature change (°c)	type of imf
b	-9.2	df
c	-7.6	df, dd
d	-4.8	df, dd, hb

df – dispersion forces, dd – dipole - dipole, hb – hydrogen bonding

which compound has the strongest intermolecular forces?

• compound a
• compound b
• compound c
• compound d

Explanation:

Step1: Relate IMF strength to temperature change

Evaporation absorbs heat, so smaller temperature drop = stronger IMF (harder to evaporate).

Step2: Compare temperature changes

Compound D has the smallest drop (-4.8°C) and most IMFs (DF, DD, HB).

Answer:

D. compound D