AP Biology: Biochemistry and Water Review

Front

What type of bond shares electrons?

Back

Covalent bond: A type of chemical bond where two atoms share one or more pairs of electrons.

Front

Attractions between water molecules are called?

Back

Hydrogen bonds: Weak attractions between the hydrogen atom of one water molecule and the oxygen atom of another.

Front

When water molecules stick easily to other water molecules, this is called what?

Back

Cohesion: The property of water that allows it to stick to itself, resulting in surface tension.

Front

What do we call an atom that has lost or gained electrons?

Back

Ion: An atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

The fact that ice floats on liquid water is due to the fact that water's solid form is _____________ than its liquid form.

Back

Less dense: Ice is less dense than liquid water, which is why it floats.

Front

What is the term for the attraction between different substances, such as water and a plant cell wall?

Back

Adhesion: The property of water that allows it to stick to other substances.

Front

What is the pH range of neutral solutions?

Back

pH 7: A pH of 7 indicates a neutral solution, where the concentration of hydrogen ions equals the concentration of hydroxide ions.

Front

What is the term for a molecule that has both a positive and a negative end?

Back

Polar molecule: A molecule with a distribution of charge leading to a positive end and a negative end.

Front

What is the process called when water molecules absorb heat without a significant change in temperature?

Back

High specific heat: Water's ability to absorb a lot of heat before its temperature changes significantly.

Front

What is the term for the amount of energy required to change water from a liquid to a gas?

Back

Heat of vaporization: The energy required to convert water from liquid to gas.