Module 2: Foundations in Chem Definitions

Question 1

define relative isotopic mass

Answer 1

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

Question 2

define relative atomic mass

Answer 2

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

Question 3

define mass spectrometry

Answer 3

an instrument which gives accurate information about relative isotopic
mass and the relative abundance of isotopes

Question 4

define isotopes

Answer 4

atoms of the same element with the same number of protons and electrons but different numbers of neutrons. they also have different masses

Question 5

define relative formula mass

Answer 5

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

Question 6

define relative molecular mass (Mr)

Answer 6

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

Question 7

ammonium ion

Answer 7

NH4^+

Question 8

carbonate ion

Answer 8

CO3^2-

Question 9

hydroxide ion

Answer 9

OH^-

Question 10

nitrate ion

Answer 10

NO3^-

Question 11

silver ion

Answer 11

Ag^+

Question 12

zinc ion

Answer 12

Zn^2+

Question 13

sulfate ion

Answer 13

SO4^2-

Question 14

define ion

Answer 14

atom or molecule with net electric charge due to the loss or gain of one or more electrons

Question 15

define stoichiometry

Answer 15

the ratio in amount of moles of each substance in a chemical reaction

Question 16

define compound

Answer 16

a substance that is composed of two or more separate elements