High Confidence - Water

Question 2

Q1) Name the bond that is found between glycerol and a fatty acid.

Q2) What is the formation of this bond called?

Q3) What reaction takes place to form this bond?

Answer 2

A1) Ester bond

A2) Esterification

A3) Condensation

Question 3

What are the functions of water?

Answer 3

A reactant in chemical reactions

A solvent

A method of transport (dissolved substances)

Helps with temperature control

A habitat

Question 4

Where would you find the slightly negatively charged side and slightly positively charged on a water molecule?

Answer 4

Oxygen - slightly negatively charged (delta negative)

Hydrogen atoms - slightly positively charged (delta positive)

Question 5

What is happening, atomically, that makes a water molecule polar.

Answer 5

The shared negative hydrogen electrons are pulled towards the oxygen atom.

Question 6

What are the bonds that form between water molecules called?

Answer 6

Hydrogen bonds

Question 7

How are the bonds between water molecules depicted?

Answer 7

Dotted line

Question 8

What happens to water when it freezes?

Answer 8

Each water molecule forms four hydrogen bonds making a lattice shape.

Ice is less dense than liquid which means it floats.

Question 9

How can ice help organisms?

Answer 9

Ice forms an insulating layer on water preventing it from freezing.

Organisms that live in water will not freeze and are still able to move around.

Question 10

How does an ion ‘dissolve’ in water?

Answer 10

In ion will become totally surrounded by water molecules.

This happens because the ion is either slightly positively, or slightly negatively charged.