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WorksheetsWater a Polar Molecule
Total questions: 25
Worksheet time: 37mins
The bonds formed between water molecules are called
Covalent bonds
Ionic bonds
Polar bonds
Hydrogen bonds
What is the reason why oil and water don't mix?
Oil is too heavy to mix with water
Water can only mix with polar or ionic molecules
Water can only mix with non-polar molecules
Oil is too light to mix with water
Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?
The insects are light enough so they do not break the hydrogen bonds holding the water molecules together
The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.
The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.
Water is neutral, that makes it a useful medium for many chemical reactions. What ions does water dissociate into with the same rate?
OH- and OH-
H+ and H+
H+ and OH-
HOH
Water is a molecule with slightly positive hydrogen atoms and a slightly negative oxygen atom. This unique arrangement gives water its —
A conductivity properties
electrolytic properties
non polarity
polarity
Which aspect of water makes it an excellent solvent?
It has a high heat capacity.
It has a low freezing point.
Its crystal form is less dense than its liquid form.
It is polar and forms hydrogen bonds
Ammonia (NH3) and water have similar structures, but the forces between the molecules of ammonia are weaker. How would the properties of ammonia differ from those of water?
Ammonia would have a lower heat capacity.
Ammonia would have greater molecular weight.
Ammonia would have a higher boiling point.
Ammonia would be more cohesive.
Is this molecule polar or non-polar?
Polar
Non-polar
Polarity can be predicted by determining the differences in
Valence electrons
Melting points
Electronegativity
Ionization energies
