Random Corrections Flashcards

1
Q

What is dissociation

A

the breaking of molecules

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2
Q

Is silicon a lattice?

A

yes

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3
Q

What is fractional distillation used for?

A

to separate 2 liquids

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4
Q

Why is 2nd ionisation energy higher

A

full outer shell
AND LESS SHIELDED

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5
Q

Why might a combustion reation not create enough energy

A

incomplete combustion
impure fuel
energy lost to surrounding

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6
Q

Why is a fast reaction good?

A

more profittable

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7
Q

Why are titrations carried out under acidic reactions?

A

to provide hydrogen ions

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8
Q

Why do titration reactions with permanganate not require indicator

A

they are SELF INDICATING

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9
Q

do weaker bond enthalpies break easier

A

yes

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10
Q

What is bond enthalpy

A

breaks 1 mol of bonds diatomic molecules

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11
Q

What is mean bond enthalpy

A

breaks 1 mol of bonds in compounds

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12
Q

Why is an inert gas used in chromatography

A

won’t react with other substances

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13
Q

Is oxidation negative or positive?

A

negative

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14
Q

Is reduction positive or negative

A

positive

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15
Q

How to set up a viscosity experiment

A

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

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16
Q

Can networks form LDF

A

no since they are covalent networks not covalent molecules

17
Q

How to tell if a molecule is very soluble in water

A

lots of OH groups
molecule is polar

18
Q

what kind of substances are not attracted to charged rods

A

non-polar

19
Q

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

A

Intermolecular forces

20
Q

are hydrocarbons polar or non-polar

A

non-polar

21
Q

What can alcohols be oxidised with

A

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

22
Q

Ehat alcohol cannot be oxidised by acidified dichromate

A

Tertiary alcohols

23
Q

What do aldehydes end in?

A

-al

24
Q

What do ketones end in?

A

-one

25
Q

What type of IMF do ketones have?

A

PD-PD interactions

26
Q

What functional groups are polar?

A

COOH
OH

27
Q

What happens to oils to make them smell bad

A

they oxidize
-becomes rancid

28
Q

How do free radical scavengers prevent further chain reactions

A

react with free radicals to form stable molecules

29
Q

How to maximise profits in industrial processes

A

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

30
Q

What does distillation do?

A

separates chemicals with different boiling points

31
Q

What can multiple OH groups do to a molecule

A

Make it polar

increase H bonding

32
Q

What is the systematic name for isoprene

A

2-methylbuta-1,3-diene

33
Q

How do emulsifiers prevent liquids from separating into layers

A

emulsifier has 2 parts
polar
non-polar

hydrophobic part dissolves in non-polar

hydrophilic dissolves in polar

34
Q

What do emulsifiers do

A

prevents non polar and polar liquids from separating into layers