Quanitifying chem

Question 1

What is relative isotopic mass?

Answer 1

The mass of a single isotope

Determined by comparing the mass of ions of the isotope to the value of carbon-12

Question 2

What is mass number?

Answer 2

Number of protons plus neutrons in an atom

Question 3

What does the mass spectrometer reveal?

Answer 3

Number of isotopes In a given isotope of a sample.
Relative isotopic mass of each isotope
Percentage abundance of each isotope

Question 4

Relative atomic mass of an element is?

Answer 4

Average mass of one atom, taking into consideration the number of isotopes of an element, their relative isotopic masses and relative abundance

Question 5

What’s the mole?

Answer 5

A unit of measure, like a dozen.
One mole is defined as the amount of substance that contains as many particles as there are atoms in 12g of carbon-12 isotope

Question 6

What is the molar mass

Answer 6

The mass of One mole of a substance

Gmol-1

Question 7

What is a hydrated ionic compound?

Answer 7

An ionic compound that has crystallises from an aqueous solution to form a hydrated ionic compound. The water of crystallisation has been introduces and included into the crystal lattice.

Question 8

What is an anhydrous ionic compound?

Answer 8

One that has had the water of crystallisation removed

Question 9

What’s the emperical formula

Answer 9

The simplest whole number ratio of the atoms or ions present in a molecule or compound eg 1:2:3

Question 10

What is the molecular formula

Answer 10

The actual composition of a compound that is made up of molecules. It may be the same as the emperical formula or a whole number multiple of it.