4E - Spectroscopy & Synthesis definitions

Question 1

Isotopes

Answer 1

Atoms ofthe same element with a different number of neutrons and a different mass

Question 2

Relative isotopic mass

Answer 2

The mass of an atom of an isotope compared with 1/12th of the mass of an atom of carbon-12

Question 3

Relative atomic mass (A_r)

Answer 3

The weighted mean mass of the formula unit of a compound compared with 1/12th the mass of an atom of carbon-12

Question 4

Relative molecular mass (M_r)

Answer 4

The weighted mean mass of a molecule of a compound compared with 1/12th the mass of an atom of carbon-12

Question 5

Molecular ion (M⁺)

Answer 5

The positive ion formed in mass spectrometry with a molecule loses an electron

Question 6

Fragmentation

Answer 6

The process in mass spectrometry that causes a positive ion to split into smaller pieces, one of which is a positive fragment ion

Question 7

Greenhouse effect

Answer 7

The warming of the Earth’s atmosphere by the absorption and reemission of infrared radiation by molecules in the atmosphere