A: Characteristics Of Water

Question 0

Adhesion

Answer 0

Different molecules clinging together.

One substance to another.

Question 1

Cohesion

Answer 1

Same molecules sticking to each other.

H2O … H2O … H2O … - link together

Question 2

Surface Tension

Answer 2

A measure of how difficult it is to stretch or break the surface of a liquid.

Ex. Water bug walking on water

Question 3

Capillary Action

Answer 3

Due to both adhesion and cohesion of water molecules.

Ex. A plant with H2O coming in through its roots, and rising to its leaves.

Question 4

Temperature stabilization
A. High specific heat
B. High heat of vaporization

Answer 4

A. Requires a great input of heat to change to change temperature increase. And requires a great output of heat to decrease temperature.

B. how much heat must be added to evaporate a liquid.

Question 5

Density of water

Answer 5

Density = mass (g) / volume (ml or cm^3)

A density less than water will float.
A density higher than water will sink.

Question 6

Solvent of life:

Solution
Solvent
Solute

Answer 6

Solution- mixture of solvent and solute.
Solvent- dissolving agent
Solute- substance that is dissolved

Homogeneous mixture

Question 7

Solvent of life:

Soluble

Insoluble

Answer 7

Soluble- capable of being dissolved in water.

Insoluble- incapable of being dissolved in water.

Question 8

Hydrophilic vs hydrophobic

Answer 8

Hydrophilic: water lovers

Hydrophobic: water fearers

Question 9

Hydration shell

Answer 9

The sphere of water molecules around each dissolved ion.

Ex. Na+ ion is surrounded more closely by oxygen because of its negative charge.

Question 10

Molarity - (M)

Answer 10

Moles / liter of H2O

Ex. 4 moles / 1 liter = 4 M

Avagadro’s # 6.02 x 10 ^23

Question 11

What kind of bonding creates molecules or compounds that are hydrophobic and hydrophilic?

Answer 11

Polar covalent - hydrophilic

Nonpolar covalent - hydrophobic