Water

What two elements make up water?

• Helium and oxygen

• Hydrogen and oxygen

• helium and carbon

• oxygen and carbon

Attractions between the negative Oxygen atom of one water molecule and the positive Hydrogen atom of another water molecule are called

• Covalent bonds

• Ionic bonds

• Polar bonds

• Hydrogen bonds

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

Water is a polar molecule, which means it has a positive and a negative side. Hydrogen bonds form when:

• The positive end of one water molecule bonds to the positive end of another water molecule.

• The negative end of one water molecule bonds to the negative end of another water molecule.

• The positive end of one water molecule bonds to the negative end of another water molecule.

The bond that holds the Oxygen and Hydrogen atoms together in a water molecule is a ________ bond.

• ionic

• Hydrogen

• Covalent

• Weak

Leafy celery stalks were placed into coloured water in a beaker overnight. The following day, the students observed the color of the celery leaves changed from green to red. The students cut across the edge of the celery and observed the small tube openings are also red.

How do the plant systems work together to make the movement of the liquid possible?

• The roots absorb the water and dissolved minerals and then move up the stem

• and dissolved minerals and then move up the stem

  The roots anchor the plant into the soil and the stem holds the leaves up.

• The roots absorb carbon dioxide and move up the stem.

• The roots and the stem lose water vapor to the soil.