Elements of Life

Question 1

when AgNO3 is added to Br- ions what will happen

Answer 1

a cream precipitate will form

Question 2

when AgNO3 is added to I- ions what will happen

Answer 2

yellow precipitate formed

Question 3

when AgNO3 is added to Cl- ions what will happen

Answer 3

white precipitate formed

Question 4

what is the empirical formula

Answer 4

The simplest whole number ratio of atoms/elements in a molecule

Question 5

what is water of crystallisation

Answer 5

H2O molecules can be present with an ionic lattices

Question 6

What does anhydrous mean

Answer 6

It doesn’t contain water

Question 7

What does hydrated mean

Answer 7

it contains water

Question 8

which is the strongest IMF

Answer 8

hydrogen bonds

Question 9

which is the weakest IMF

Answer 9

ID-ID

Question 10

ionisation energy increases…

Answer 10

across a period

Question 11

ionisation energy increases across a period because…

Answer 11

there are more protons/electrons so greater nuclear charge as e- are going to same main shell

Question 12

greater nuclear charge means…
(ionisation energy)

Answer 12

there is stronger nuclear attraction

Question 13

stronger nuclear attraction leads to…
(ionisation energy)

Answer 13

higher 1st ionisation energy as harder to remove electrons

Question 14

When group 2 reacts with H2O what is produced

Answer 14

hydroxides

Question 15

Group 2 burns in oxygen to form…

Answer 15

oxides

Question 16

group 2 can neutralise..

Answer 16

acuds

Question 17

in emission spectra energy is..

Answer 17

released as electrons fall from excited to ground state

Question 18

in absorption spectra energy is…

Answer 18

absorbed, promoting electrons from ground state to excited

Question 19

which halide is insoluble in ammonia

Answer 19

iodine

Question 20

which halide ion in soluble in excess ammonia

Answer 20

bromide ions

Question 21

which halide ion is soluble in a few drops of ammonia

Answer 21

chloride ions

Question 22

which have higher boiling pints straight or branched chain molecules

Answer 22

straight

Question 23

what are isotopes?

Answer 23

isotopes of an element are atoms with the same atomic number but different mass number

Question 24

do isotopes have the same chemical properties as other isotopes of that element?

Answer 24

yes

Question 25

what did JJ Thompson propose about the atom?

Answer 25

plum pudding model

Question 26

what was the plum pudding model?

Answer 26

positively charged sphere with electrons embedded within

Question 27

what experiment did Rutherford do?

Answer 27

fired alpha particles at a think sheet of gold. some were deflected slightly but most passed through

Question 28

what did the Bohr model propose?

Answer 28

• e- exist in fixed orbits • each shell has fixed energy

Question 29

how can relative masses be measured?

Answer 29

using a mass spectrometer

Question 30

how can we work out relative atomic mass?

Answer 30

from mass spectrum data

Question 31

what is avogadro’s constant?

Answer 31

6.02 x 10^23

Question 32

number of moles =

Answer 32

number of particles you have / avogadro’s constant

Question 33

moles= (conc)

Answer 33

concentration x volume

Question 34

1000 cm3 in dm3 is?

Answer 34

1cm3

Question 35

what is the flame colour for copper

Answer 35

blue

Question 36

what is the flame colour for sodium

Answer 36

orange-yellow

Question 37

what is the flame colour for barium

Answer 37

green

Question 38

what is the flame colour for calcium

Answer 38

brick red

Question 39

what is the flame colour for potassium

Answer 39

lilac

Question 40

what is the flame colour for lithium

Answer 40

crimson

Question 41

how does heating crystals in a hot flame produce colour?

Answer 41

the heat energy excited electrons so they emit light when they fall

Question 42

how many electrons can a p orbital hold?

Answer 42

2

Question 43

what feature of an atoms structure was deduced from the Geiger and Marsden eperiment?

Answer 43

the nucleus is small and dense

Question 44

down the group the first ionisation energies of group 2 elements..

Answer 44

decrease

Question 45

down the group the thermal stability of carbonates with group 2 compounds...

Answer 45

increase