Atoms, Ions, and Compounds 2.1

Question 1

Relative atomic mass

Answer 1

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

Question 2

Relative Isotopic Mass

Answer 2

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

Question 3

Mass and charge of proton

Answer 3

Relative mass- 1

Relative charge- 1+

Question 4

Mass and charge of electron

Answer 4

Relative mass- 1/1836

Relative charge- -1

Question 5

Mass and charge of neutron

Answer 5

Relative mass- 1

Relative charge- 0

Question 6

Isotopes

Answer 6

Atoms of the same element with the same number of electrons and protons but different number of neutrons.

Question 7

Why do isotopes react in the same way?

Answer 7

They are the same element and have the same number and electrons, and the number of neutrons has no effect on the reaction.

Question 8

Ion

Answer 8

Atom or group of atoms with a positive or negative charge

Question 9

How is the percentage abundance of atom found?

Answer 9

Using a mass spectrometer which detects the m/z ratio.

Question 10

Formulae of relative atomic mass

Answer 10

(%abundance x RAM) + (%abundance x RAM) divided by 100

Question 11

Cations

Answer 11

Positive ions- lose electrons (atoms on the left side of periodic table)

Question 12

Anions

Answer 12

Negative ions, gain electrons to form anions. (Right side of periodic table)

Question 13

Which transition metals don’t follow the pattern

Answer 13

Ag+, Zn2+, Al3+

Question 14

Ammonium

Answer 14

NH4+

Question 15

Hydroxide

Answer 15

OH-

Question 16

Nitrate

Answer 16

(NO3)-

Question 17

Carbonate

Answer 17

(CO3)2-

Question 18

Sulfate

Answer 18

(SO4)2-

Question 19

Weighted mean mass

Answer 19

Taking into account the relative abundances of isotope
sum of mass x %abundance / total abundance