last minuto

Question 1

for Q= mctriangleT, what is C

Answer 1

4.18

Question 2

what type of structure does bromine form

Answer 2

simple molecular/ simple covalent structure

Question 3

does ionisation energy increase or decrease down group 2

Answer 3

decrease so its easier to lose electrons

Question 4

what’s the last peak on a mass spectrum

Answer 4

the molecular mass

Question 5

why does rate of reaction decrease over time

Answer 5

the amount of reactants decrease thus less concentrated, leading to fewer collisons per second/ less frequent collisions- more collisons per unit volume

Question 6

describe the process of separating organic and aq layers

Answer 6

• use a separating funnel
• dry with an anhydrous salt, distillation
• conc of upper layer= less dense
• drying agent
• collection of fractional distillation

Question 7

2 beneficial ways of disposing polymers

Answer 7

• organic feedstock

- combustion for energy production

Question 8

is the energy change of vaporisation of bromine endothermic or exothermic

Answer 8

endothermic as energy is required to overcome induced dipole dipole forces

Question 9

adv and disadvantage of using combustion as a method for waste disposal

Answer 9

adv: energy production/ used to produce electricity
disadvat: formation of CO/ co2 which causes global warming

Question 10

why cant ionic structures conduct

Answer 10

ions aren’t free to move and are only fixed in a lattice

Question 11

what happens in distillation

Answer 11

product is separated to prevent no further oxidation

Question 12

alcohol to alkene conditions

Answer 12

acid catalyst and heat

Question 13

why does Br2 not exist in the gaseous state under standard conditions

Answer 13

-because energy is needed to break the induced dipole dipole interactions

Question 14

how does a catalyst change equilibrium-

Answer 14

• it only changes rate of reaction

Question 15

to test for ammonium ion, what do u use

Answer 15

• warm NaOH