Module 2

Question 1

isotope

Answer 1

an atom of an element with the same number of proton but a different number of neutrons

Question 2

atomic number

Answer 2

num of proton

Question 3

number of neutron

Answer 3

mass number - atomc number

Question 4

relative isotopic mass

Answer 4

mass of an atom of an isotope relative to 1/12 the mass of a C-12 atom

Question 5

relative atomic mass

Answer 5

weighted mean mass of an atom of an element relative to 1/12 the mass of C-12 atom

Question 6

relative molecular mass

Answer 6

NH3 = 14 + (3 x 1) = 17

Question 7

group charges

Answer 7

1 = 1+
2 = 2+
3 = 3+
5 = 3-
6 = 2-
7 = 1-

Question 8

known compounds

Answer 8

.NO3^-
.SO4^2-
.CO3^2-
.OH^-
.NH4^+
.Zn^2+
.Ag^+

Question 9

amount of substance

Answer 9

quantity which measures the size of an entity

Question 10

mole

Answer 10

.unit for amount of substance
.the num of atoms in 12 g of C-12
.6.02 x 10^23

Question 11

molar mass

Answer 11

mass - amount

Question 12

molar gas volume

Answer 12

.volume occupied by one mole of gas at RTP
.24 dm^3 mol

Question 13

ideal gas equation

Answer 13

pV - nRT

p = pressure, Pa
V = volume, m^3
n = moles
R = gas constant (8.314)
T = absolute temp (K)

Question 14

conversions

Answer 14

.1m^3 = 1000 dm^3 = 1,000,000 cm^3
.1 Pa = 1/1000 KPa
K = C + 273

Question 15

concentration(solutions)

Answer 15

amount / volume

Question 16

moles(of gas at RTP)

Answer 16

volume / 24dm3

Question 17

percentage yield

Answer 17

actual/theoretical x 100

Question 18

atom economy

Answer 18

mass of disired/total mass

Question 19

common acids

Answer 19

.HCl
.HNO3
.H2SO4
.CH3COOH

Question 20

common alkalis

Answer 20

.NaOH
.KOH
.NH3

Question 21

neutralisation reaction

Answer 21

H+ + OH- –> H2O

Question 22

Metal + acid ->

Answer 22

metal salt + hydrogen

Question 23

metal hyrdroxide + acid ->

Answer 23

salt + water

Question 24

metal oxide + acid ->

Answer 24

salt + water

Question 25

metal carbonate + acid ->

Answer 25

salt + water + carbon diaoxide

Question 26

acid +ammonia ->

Answer 26

ammmouim salt

Question 27

num of electrons in each shell

Answer 27

1 = 2
2 = 8
3 = 18
4 = 32

Question 28

orbital

Answer 28

region of space around the nucleus which contains up to two electrons

Question 29

subshells

Answer 29

s - spherical- 1
p - dumbell- 3
d-5
f-7

Question 30

degenerate

Answer 30

same energy

Question 31

ionic bonding

Answer 31

.electrostatic attraction between oppositvely charged ions
.metal and non metal ions

.High MP and BP
.dont conduct when solid
.do conduct when moltern or liquid

Question 32

covalent bonding

Answer 32

.electrostatic attraction between the nuclei of atoms and the shared pair of electrons

.only non metals

Question 33

bond shapes

Answer 33

.1 bp = linear
.2 bp, 0lp = linear 180
.2bp, 2lp = bent 104.5
.3bp 0lp = trigonal planar 120
.4bp, 0lp = tetrahedral 109.5
.5bp, 0lp = trigonal bipyrimidal = 90 and 120
.6bp, 0lp = octohedral 90

Question 34

electronegativity

Answer 34

ability of an atom to attract the pair of electrons in a covalent bond

Question 35

hydrogen bonds

Answer 35

.interaction between a hydrogen atom bonded to oxygen, nitrogen or florine and a lone pair of a different molecule of O, N, F

Question 36

water

Answer 36

.solid less dense than liquid- large gaps in solid structure
.high BP and MP due to strong hydrogen bonds between molecules