Just Testing

Which end of the water molecule has a slightly positive charge?

• the oxygen end
• the hydrogen end
• both ends are slightly positive
• neither end is positive

Water is a universal solvent because it...

• It can be found anywhere
• It freezes when it gets cold
• floats when frozen
• Dissolves most substances

A water molecule has the chemical formula H2O. This means that the water molecule is made up of

• Two hydrogen atoms and one oxygen atom

• Two oxygen atoms and one hydrogen atom

• Two hydrogen atoms and two oxygen atoms

• Two molecules of water

Capillary Action is key for

• Water moving from roots to leaves in plants

• Air moving from mouth to lungs

• Ice floating on water

• Water moving to lower areas

The tightness across the surface of water that enables paper clips to float is ____________.

• adhesion
• capillary action
• surface tension
• polarity

Cohesive means ........

• the water molecules stick to each other

• the water molecules stick to other surfaces

• the water molecules are less dense

• the water molecules are far apart

Adhesive means ........

• the water molecules stick to each other

• the water molecules stick to other surfaces

• the water molecules are less dense

• the water molecules are far apart

Water striders can walk on water because of ____________.

• capillary action

• adhesion

• surface tension

• universal solvent

Water can bounce on water because of surface tension.

• True

• False

Why is water so good at dissolving so many substances?

• it is polar

• it is less dense as a solid

• cohesion

• adhesion