Random Corrections

Question 1

What is dissociation

Answer 1

the breaking of molecules

Question 2

Is silicon a lattice?

Answer 2

yes

Question 3

What is fractional distillation used for?

Answer 3

to separate 2 liquids

Question 4

Why is 2nd ionisation energy higher

Answer 4

full outer shell
AND LESS SHIELDED

Question 5

Why might a combustion reation not create enough energy

Answer 5

incomplete combustion
impure fuel
energy lost to surrounding

Question 6

Why is a fast reaction good?

Answer 6

more profittable

Question 7

Why are titrations carried out under acidic reactions?

Answer 7

to provide hydrogen ions

Question 8

Why do titration reactions with permanganate not require indicator

Answer 8

they are SELF INDICATING

Question 9

do weaker bond enthalpies break easier

Answer 9

yes

Question 10

What is bond enthalpy

Answer 10

breaks 1 mol of bonds diatomic molecules

Question 11

What is mean bond enthalpy

Answer 11

breaks 1 mol of bonds in compounds

Question 12

Why is an inert gas used in chromatography

Answer 12

won’t react with other substances

Question 13

Is oxidation negative or positive?

Answer 13

negative

Question 14

Is reduction positive or negative

Answer 14

positive

Question 15

How to set up a viscosity experiment

Answer 15

Time taken for substance to pass burette
-longest time = most viscous

Question 16

Can networks form LDF

Answer 16

no since they are covalent networks not covalent molecules

Question 17

How to tell if a molecule is very soluble in water

Answer 17

lots of OH groups
molecule is polar

Question 18

what kind of substances are not attracted to charged rods

Answer 18

non-polar

Question 19

What kind of forces need to be overcome for a substance to change state

Answer 19

Intermolecular forces

Question 20

are hydrocarbons polar or non-polar

Answer 20

non-polar

Question 21

What can alcohols be oxidised with

Answer 21

Acidified Dichromate (orange>green)
Hot Copper Oxide (black to form a brown solid
Tollens (silver)
Fehlings (red precipitate)

Question 22

Ehat alcohol cannot be oxidised by acidified dichromate

Answer 22

Tertiary alcohols

Question 23

What do aldehydes end in?

Answer 23

-al

Question 24

What do ketones end in?

Answer 24

-one

Question 25

What type of IMF do ketones have?

Answer 25

PD-PD interactions

Question 26

What functional groups are polar?

Answer 26

COOH
OH

Question 27

What happens to oils to make them smell bad

Answer 27

they oxidize
-becomes rancid

Question 28

How do free radical scavengers prevent further chain reactions

Answer 28

react with free radicals to form stable molecules

Question 29

How to maximise profits in industrial processes

Answer 29

sell by-products
Use a catalyst
let reactors run at lowest possible temperatures
use inexpensive feedstocks
recycle gasses

Question 30

What does distillation do?

Answer 30

separates chemicals with different boiling points

Question 31

What can multiple OH groups do to a molecule

Answer 31

Make it polar

increase H bonding

Question 32

What is the systematic name for isoprene

Answer 32

2-methylbuta-1,3-diene

Question 33

How do emulsifiers prevent liquids from separating into layers

Answer 33

emulsifier has 2 parts
polar
non-polar

hydrophobic part dissolves in non-polar

hydrophilic dissolves in polar

Question 34

What do emulsifiers do

Answer 34

prevents non polar and polar liquids from separating into layers