Question

question 4 if a molecule is polar, we would expect which of the following? a it will form hydrogen bonds with water b it will float on water c it will form droplets like oil does d it must contain hydrogen or oxygen e it will be hydrophobic

Explanation:

1. Polar molecules have a partial positive and partial negative charge due to unequal electron sharing.
2. Water is a polar molecule (with partial positive on H and partial negative on O).
3. Polar molecules can form hydrogen bonds with water (since water has H and electronegative O, and polar molecules can have groups that interact via H - bonding).
4. Option B: Floating on water depends on density, not polarity.
5. Option C: Oil is non - polar; polar molecules mix with water, not form droplets like oil.
6. Option D: A polar molecule doesn't necessarily have to contain H or O (e.g., some polar molecules with N and electronegative atoms).
7. Option E: Polar molecules are hydrophilic (attracted to water), not hydrophobic.

Answer:

A. It will form hydrogen bonds with water