Unit 3.07 - 3.12

Question 1

What happens when gas particles are at high pressures and low temperatures?

Answer 1

Gas particles come close enough to one another to make two postulates of the kinetic molecular theory valid. This also makes IMF more important.

Question 2

Under these conditions (high P and L temp), gases are said to __________

Answer 2

behave non-ideally or like ‘real’ gases

Question 3

When gases are compressed to high pressures, the observed total volume occupied by the gas under these real conditions is artificially _______

Answer 3

large

Question 4

The actual pressure of a gas is lower than one would expect because ______

Answer 4

the particles are attracted to one another, they collide with the walls with less force

Question 5

Solutions are homogeneous mixtures that are composed of a _____ and __________

Answer 5

solute and solvant

Question 6

Define colloid

Answer 6

a mixture of two separate phases

Question 7

Define dilution

Answer 7

To make a solution weaker by adding water to more concentrated ones.

Question 8

Add _____ first, and then ______

Answer 8

Acid; water

Question 9

The solute particles must separate from one another. Endothermic or Exothermic?

Answer 9

bond-break process, endothermic

Question 10

The solvent particles must separate from one another. endothermic or exothermic?

Answer 10

bond-breaking process, endothermic

Question 11

The solvent and solute particles must interact. endothermic or exothermic?

Answer 11

bond making process, exothermic

Question 12

Solutions may be represented by particulate diagrams where _________________

Answer 12

properties of the solution such as concentration and inter-particle interactions can be illustrated.

Question 13

More concentration, _______

Answer 13

less water in high moles

Question 14

Less concentration, ________________

Answer 14

more water in low moles

Question 15

Liquid solutions cannot be separated into their components using __________

Answer 15

filter paper

Question 16

Ultraviolet (UV) (relatively short wavelengths) cause ___________________

Answer 16

electronic transitions
- most energy
- destroys atoms in single bonds

Question 17

Infrared (IR) (intermediate wavelengths) absorb ___________________

Answer 17

that energy and tend to bend, stretch and vibrate
- gives off the energy recieved

Question 18

Microwaves (relatively long wavelengths) cause _____________

Answer 18

molecular rotation
- polar molecules only
- gives off energy received