Module 2 Chapter 3

Question 1

What is the mol and what is its units

Answer 1

The amount of a substance is the number of moles. The unit of a mole is (mol)

Question 2

What is avogrado’s constant

Answer 2

Is the number of particles per mole, 6.02 x 10^23 mol^-1.

Question 3

What can the particles be in avogrados constant

Answer 3

Atoms, electrons, molecules

Question 4

What does one mole for a substance contain

Answer 4

One mole of a substance contains the same number of entities as there are atoms in 12.0g of carbon 12.

Question 5

Mol formula

Answer 5

Mol = mass/molar mass

Question 6

Avogrados constant formula

Answer 6

Mol = number of particles/avogrado’s constant

Question 7

What is the formula for percentage composition by mass

Answer 7

the mass of the element in 1 mol of the substance/ the compounds mr x 100

Question 8

What is empirical formula

Answer 8

The simplest whole number ratio of each element present in a compound

Question 9

What is relative molecular masses

Answer 9

Calculated by adding the relative atomic masses of the elements making up a molecule

Question 10

What is relative formula mass

Answer 10

Calculated by adding together the relative atomic masses of the elements in the empirical formula.

Question 11

What are liquids and gases measured by

Answer 11

Volume

Question 12

How many cm3 are in a ml

Answer 12

1 cm3 = 1ml

Question 13

How many decimetres3 are in a cm3

Answer 13

1000

Question 14

What is the formula for concentration

Answer 14

Moles/volume(dm3)

Question 15

What is a standard solution

Answer 15

A solution of a known concentration.

Question 16

How is a standard solution prepared

Answer 16

It’s prepared by dissolving an exact mass of solute into solvent and making up the solution to an exact volume.

Question 17

How do u work out the mass required for a standard solution

Answer 17

We use the mol

Question 18

What happens at the same temperature and pressure

Answer 18

Equal volumes of gas have the same molar volume

Question 19

What is the molar gas volume

Answer 19

24dm3

Question 20

What is the formula for molar gas volume

Answer 20

24=volume/moles

Question 21

What are the 4 assumptions when using the ideal gas equation

Answer 21

1. Random motion
2. Elastic collisions (no loss of kinetic energy)
3. Negligible size
4. No intermolecular forces

Question 22

What is the ideal gas equation

Answer 22

Pressure x volume = temperature x mol x ideal gas constant (8.314)

Question 23

What are the units of the ideal gas equation

Answer 23

Pressure - pa
Volume = m3
Moles = moles
Temperature = kelvin
Ideal gas constant - 8.314

Question 24

How to convert cm3 to m3

Answer 24

X 10 ^-6

Question 25

how to convert degrees Celsius to kelvin

Answer 25

C + 273