Amount Of Substance

Question 1

What is relative atomic mass

Answer 1

Is the average mass of an atom of an element compared with 1/12th the mass of one atom of carbon 12

Question 2

What is relative molecular mass

Answer 2

Is the sum of the relative atomic masses of all the atoms in a molecule

Question 3

What is relative formula mass

Answer 3

Is the sum of the atoms that make a formula unit of a compound with a giant structure

Question 4

What are ideal gases

Answer 4

Gases that have point-like particles in random motion. The particles do not react on collision, undergo elastic collisions and there are no inter molecular forces between them

Question 5

What is the ideal gas equation

Answer 5

pV = nRT
p (pressure - Pa)
V (volume - dm^3)
n (number of moles)
R (molar gas constant)
T (temperature - K)

Question 6

How many particles does 1 mole contain

Answer 6

6.023x10^23

Question 7

What does the empirical formula give

Answer 7

The simplest whole number ratio of atoms of each element used to make a compound

Question 8

What is a molecular formula

Answer 8

The actual number of atoms each element used to make a molecule

Question 9

What is the chemical formula

Answer 9

An element or a compound with a giant structure is the number of atoms of each element used to make a formula unit

Question 10

Units of concentration

Answer 10

moldm^-3

Question 11

Moles =

Answer 11

Concentration X volume

Mass/Mr

Question 12

What is a volumetric solution

Answer 12

One in which the concentration is known

Question 13

What is a titration used for

Answer 13

To find an unknown volume or concentration of reactant