Section 1

Question 1

Neutron - mass and charge

Answer 1

1 and 0

Question 2

Electron - mass and charge

Answer 2

1/2000 and 1-

Question 3

Mass number

Answer 3

The total number of protons and neutrons in the nucleus of an atom

Question 4

Atomic number

Answer 4

Number of protons in the nucleus of an atom

Question 5

Isotopes

Answer 5

Elements are atoms with the same number of protons but different number of neutrons

Question 6

Proton - mass and charge

Answer 6

1 and 1+

Question 7

Why do isotopes have similar chemical properties?

Answer 7

Have the same configuration of electrons

Question 8

Why do isotopes have slightly different physical properties?

Answer 8

Because the physical properties depend more on the mass of the atom

Question 9

What is the nuclear symbol?

Answer 9

The mass number, atomic number and element symbol

Question 10

Relative atomic mass

Answer 10

the mean mass of an atom of an element compared to 1/12 of the mass of an atom of carbon-12

Question 11

relative isotopic mass

Answer 11

the mass of an atom of an isotope of an element compared to 1/12 of the mass of an atom of carbon-12

Question 12

relative molecular mass

Answer 12

the average mass of a molecule compared to 1/12 of the mass of an atom of carbon-12

Question 13

number of moles equation

Answer 13

number of particles you have / number of particles in a mole

Question 14

gas equation under standard conditions

Answer 14

no. moles = volume in dm / 24

Question 15

gas equation not under standard conditions

Answer 15

pV = nRT

Question 16

gas constant

Answer 16

8.314