Chapter 1 : Atoms , Ion and Compounds

Question 1

what is relative isotopic mass

Answer 1

relative isotopic mass is the mass of an isotope relative to 1/12th of the mass of an atom of carbon-12

Question 2

how is mass spectrometer used to determine percentage abundance of each isotopes in a sample

Answer 2

1) place sample in mass spectrometer 2) sample is vaporised and ionised to positive ions 3) ions are accelerated. Heavier ions move slower and more difficult to deflect than lighter ions so ions of each isotope are seperated. 4) ions are detected on mass spectrometer as mass/charge ratio.

Question 3

what are cations

Answer 3

positive ions

Question 4

what are anions

Answer 4

negative ions

Question 5

what does weighted mean mass take account of

Answer 5

1) percentage abundance of each isotope 2) relative isotopic mass of each isotope

Question 6

what are isotopes

Answer 6

isotopes are atoms of the same element with different number of neutrons

Question 7

mass number formula

Answer 7

proton number + neutron number

Question 8

what are the polyatomic ions

Question 9

relative atomic mass

Answer 9

relative atomic mass is the weighted mean mass of an atom of an element relative to a 1/12th of the mass of carbon-12

Question 10

What is the avogrado constant

Answer 10

6.02 x 10^23

Question 11

What is empirical formula

Answer 11

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