Properties of Water

Paper chromatography can be used to separate pigments in a black dot or can even separate chemicals from a mixture. This is because the pigments or chemicals are different sizes and are carried by water up the paper at different rates.  Water can move UP paper, against gravity, due to ______________.

• capilary action
• capital action
• cohesion action
• coronary action

Water is polar because...

• The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.
• The molecule has two poles, at which the it is colder than other regions of the molecule.
• The unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.
• The water molecule is neutral.

If you put a drop of dishwashing liquid on your finger and then dip it into the pepper and water the pepper will rush to the outer edges of the dish. Why does this happen?

• the pepper will not interact with soap, so rushes away.
• the cleaning powers of soap are 'cleaning' the water
• When you add detergent to water the surface tension of the water is lowered, so the water flattens out and the pepper is carried to the edges with it.
• it's magic.

Why does ice float?

• As water freezes, it expands and its density decreases.
• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
• As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

When you mix salad oil and water they immediately separate because:

• Salad oil is hydrophobic
• Hydrogen bonds reform between water molecules
• Salad oil is too heavy
• It depends on what kind of oil you are using

What word describes when a molecule is attracted to water?

• hydrophobic
• hydrophilic
• bipolar
• solvent

The reason the water balloon did NOT pop while held over a flame is water's _________.

• Less dense than air.
• Hydrogen bonds between water molecules.
• polarity.
• high specific heat capacity.

What property of water helps to moderate earth's temperature?

• adhesion
• chohesion
• Specific heat capacity
• Latent heat of vaporization

Which is NOT a unique property of water?

• Frozen water floats on liquid water.
• Water covers most of the Earth’s surface and retains a large amount of heat.
• Water molecules stick to each other through hydrogen bonds.
• Water cools very rapidly.

The attraction that causes water and other liquids to form drops on thin films is called ________________. This is also water’s ability to be attraction to other water molecules.

• adhesion
• capillary action
• cohesion
• surface tension