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Chemistry > Feb mock > Flashcards

Feb mock Flashcards

1
Q

Can ionic compounds conduct electricity?

A

Yes - in a molten or liquid state as the ions are free to move

However, not in a solid state as the ions aren’t able to move.

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2
Q

In an investigation with Carboxylic acids, why is it important to connect the gas syringe quickly?

A

To stop as little gas as possible from escaping.

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3
Q

Functional group of esters

A

COO

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4
Q

Three observations when Sodium reacts with water (GP 1 metal)

A

Sodium moves around the surface of water

Effervescence

Sodium eventually disappears

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5
Q

Why is Potassium more reactive than Sodium

A

-Potassium has one more shell than Sodium

-Therefore the attraction between outer shell and nucleus is weaker,

-meaning it is easier to lose the outer shell and break the attraction.

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6
Q

Why is aluminum malleable

A

Because the layers of ions can slide over each other.

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7
Q

What are the conditions needed for cracking

A

Temperature of 600-700C

Catalyst of Silica

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8
Q

How is crude oil separated into fractions?

A

-The crude oil is heated and vaporized

-The vapor is split into 6 columns based on boiling point, top is the lowest, bottom is the highest.

-The vapors then condense at their boiling points

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9
Q

Name two processes that occur before the solid lead iodide forms from crystallisation

A

Diffusion and dissolving

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10
Q

What is meant by the term functional group?

A

The part of a molecule that gives it its chemical properties.

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11
Q

Functional group for carboxylic acids

A

COOH

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12
Q

Functional group for Esters

A

COO

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13
Q

Functional group for alcohols

A

O-H

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14
Q

Substance needed for the fermentation of glucose

A

Yeast

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15
Q

Conditions needed for the fermentation of glucose

A

Anaerobic conditions (No oxygen)

30-40C so the yeast enzymes are at optimum temperature

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16
Q

How do we know when an ester is formed

A

A fruity smell is given off

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17
Q

Give one use of an ester

A

Used in cheap perfumes

18
Q

Ethanol can be oxidized to produce a carboxylic acid

Give 2 of the reagents used in this oxidation reaction

A

Dilute sulfuric acid

Potassium Dichromate (IV)

19
Q

Color change in the oxidation of ethanol

A

Orange —–> Green

20
Q

Why is it better to heat the mixture using a water bath than with a Bunsen burner (Organic II)

A

Because alcohols are very flammable

21
Q

Structural Formula for ethanol

A

CH3CH2OH

22
Q

When Butanol reacts with Propanoic acid an ester forms, give the name of this ester

A

Butyl Propanoate

23
Q

What is the chemical formula of the salt formed when Ethanoic acid reacts with Potassium Carbonate

A

CH3COOK

24
Q

When an alcohol and a carboxylic acid react they form an ester and?

A

Water

25
Q

Give two properties of a homologous series

A

They have similar chemical properties

They have the same functional group

26
Q

How do you separate an insoluble solid from a liquid

A

Filtration

27
Q

How do you separate Pure water from a solution

A

Simple distillation

28
Q

seperatinga Liquid from a mixture of liquids with different boiling points

A

Fractional Distillation

29
Q

Soluble solid from a solution

A

Crystallation

30
Q

What precipitate is formed when you mix potassium chloride and ammonium carbonate

A

No precipitate

31
Q

What precipitate is formed when you mix magnesium sulfate and barium chloride

A

Precipitate of Barium Sulfate

32
Q

Test for Potassium

A

Flame test, dip flame in Dilute HCl then place over flame, flame turns lilac colour

33
Q

Test for Sodium

A

Flame test, flame turns yellow

34
Q

Carbonate test

A

Add dilute HCl and if Co2 is given off carbonate is present (test co2 by bubbling gas through limewater)

35
Q

Halide test (Iodide, Chloride, Bromide)

A

-Add dilute nitric acid

-Add silver nitrate

-Iodide forms yellow precipitate, Bromide forms cream precipitate and Chloride forms white precipitate

36
Q

Why are enthalpy change experiments carried out in polystyrene.

A

Polystyrene is a good insulator

37
Q

Why do isotopes of bromine have the same chemical properties

A

They have the same number of electrons

38
Q

What is a redox reaction

A

When one substance loses electrons and is oxidized and when the other gains electrons and is reduced.

39
Q

What is a hydrocarbon

A

A compound that only consists of hydrogen and carbon atoms

40
Q

Why is cracking an important process in the oil industry

A

Cracking produces shorter chains of hydrocarbons that are more useful

Alkanes are made and are useful for fuels

Alkenes are made and can be used to make polymers/Plastics

Chemistry (26 decks)

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