2.1 atomic structure and isotopes

Question 1

Isotope

Answer 1

Different number of neutrons and different masses of the same element

Question 2

Relative isotopic mass

Answer 2

Mass compared with 1/12th mass of carbon -12

Question 3

Relative atomic mass

Answer 3

Weighted mean mass compared with 1/12th mass of carbon -12

Question 4

Cation

Answer 4

Positive charge

Question 5

Anion

Answer 5

Negative charge

Question 6

Ammonium

Answer 6

NH4+

Question 7

Hydroxide

Answer 7

OH-

Question 8

Nitrite

Answer 8

NO2-

Question 9

Hydrogencarbonate

Answer 9

HCO3-

Question 10

Permanganate (manganate VII)

Answer 10

MnO4 -

Question 11

Carbonate

Answer 11

CO3 2-

Question 12

Sulphate

Answer 12

SO4 2-

Question 13

Sulfite

Answer 13

SO3 2-

Question 14

Dichromate (VI)

Answer 14

Cr2O7 2-

Question 15

Phosphate

Answer 15

PO4 3-

Question 16

Avogadro constant

Answer 16

No. Of particles per mole

6.02 x 10 (23) mol-1

Question 17

Empirical formula

Answer 17

Simplest whole number ratio of atoms of each element present in a compound

Question 18

dm3 to cm3

Answer 18

X1000

Question 19

.x H2O

Answer 19

Water of crystallisation

Question 20

Assumptions about ideal gases

Answer 20

Random motion
Elastic collisions
Negligible size
No intermolecular forces

Question 21

Ideal gas equation

Answer 21

pV=nRT

Volume = m3
Pressure = Pa
Gas moles = mol
Ideal gas constant = 8.31 Jmol-1K-1
Temperature = k

Question 22

Acid + metal =

Answer 22

Salt + hydrogen

Question 23

Acid + metal hydroxides =

Answer 23

Salt + water

Question 24

Acid + base =

Answer 24

Salt + water

Question 25

Acids + metal carbonates =

Answer 25

Salt + water + CO2