Defintions

Question 1

Relative atomic mass- Ar (words)

Answer 1

Is the average mass of an atom of an element on a scale where an atom of carbon 12 is exactly 12
= mass number in PT

Question 2

relative atomic mass (formula)

Answer 2

Mean mass of an atom / 1/12th mass of an atom of carbon 12

Question 3

Relative molecular mass

Answer 3

• average mass of a molecule on a scale where an atom of carbon 12 is 12

Question 4

Relative isotopic mass

Answer 4

• is the mass of an atom of an isotope of an element on a scale where an atom of carbon 12 is 12

Question 5

Atom economy

Answer 5

• is a theoretical value that measures the efficiency of an reaction
  AE= Mr of desired products / Mr of reactants

Question 6

Formula of ideal Gas equation

Answer 6

p x v = n x r x t
Pressure x volume = moles x gas constant x temperature

Question 7

Empirical formula

Answer 7

• the simplest whole number ratio of atoms of each element in a compound

Question 8

Empirical formula

Answer 8

• the simplest whole number ratio of atoms of each element in a compound

Question 9

Molecular formula

Answer 9

• actual no. Of atoms of each element in a compound

Question 10

Percentage yield

Answer 10

• experimental value of the efficiency of an reaction
  % yield = Actual yield / theoretical yield x 100%

Question 11

Ionisation

Answer 11

Is a process in which atoms lose electrons and become ions

Question 12

First ionisation energy

Answer 12

• is the enthalpy change for the removal of one mole of electrons of one mole of atom of an element in gas phase