The Mole Refresh

Question 1

How many particles are in one mole?

Answer 1

6.022 x 10 to the power of 23

Question 2

What is molar mass the same as?

Answer 2

1 mol or 6.022x10 to the power of 23 molecules

Question 3

What exactly is 1 Mole?

Answer 3

The molar mass (in grams) of a substance

Question 4

What is an element’s molar mass?

Answer 4

The quantity in grams equal to its atomic weight

Question 5

How do you determine the molar mass of an element?

Answer 5

Look up the amu of the element in the periodic table - add grams

Question 6

What is the overall molar mass of a molecule called?

Answer 6

Molecular mass in grams

Question 7

What are solutions?

Answer 7

Homogeneous mixtures of two or more substance

Question 8

What is a solute?

Answer 8

The substance being dissolved

Question 9

What is a solvent?

Answer 9

The substance doing the dissolving

Question 10

What will polar molecules dissolve in?

Answer 10

Polar liquids

Question 11

Give an example of a polar liquid.

Answer 11

Water

Question 12

What will nonpolar solutes dissolve in?

Answer 12

Nonpolar solvents

Question 13

What is a dilute solution?

Answer 13

A solution that contains relatively little solute in a large quantity of solvent

Question 14

What is a concentrated solution?

Answer 14

A solution that contains a relatively large amount of solute in a given quantity of solvent

Question 15

What is a saturated solution?

Answer 15

A solution that contains the maximum amount of solute that can be dissolved in a particular quantity of solvent at equilibrium at a given temperature

Question 16

What are the three different solution concentrations?

Answer 16

Weight/weight solutions

Weight/volume solution

Volume/volume solution

Question 17

What are the two parts solutions?

Answer 17

Parts per million (ppm)

Parts per billion (ppb)

Question 18

What is 1 ppm of a litre?

Answer 18

1mg/L

Question 19

What is molarity?

Answer 19

An expression of the concentration of a solution in moles of solute per litre of solution

Question 20

What is the equation for molarity?

Answer 20

Moles of solution/L of solution

Question 21

What is dilution?

Answer 21

The process of adding solvent usually water, to lower the concentration of a solution

Question 22

What is a stock solution?

Answer 22

A concentrated solution that can be used to prepare more dilute solutions

Question 23

What is the dilution calculation formula?

Answer 23

C1 x V1 = C2 x V2

C1 = initial concentration (mol dm-3)
V1 = initial volume (cm3)
C2 = final concentration
V2 = final volume

Question 24

What is cm3 equal to?

Answer 24

ml

Question 25

What is mol dm-3 equal to?

Answer 25

Moles per litre = M

Question 26

What is serial dilution?

Answer 26

Successive dilutions for large scale dilutions in steps

Question 27

What is a dilution factor?

Answer 27

The factor by which the stock solution is diluted