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csec chemistry > C16: Important things to Remember > Flashcards

C16: Important things to Remember Flashcards

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1
Q

Steps in extraction of Aluminium from its ore

A
  1. Aluminium es extracted by electrolysis 2. Alumina (Al203) is obtained from bauxite 3. Aluminuim oxide is molten in the presence of cryolite 4. The electrolyte is molten aluminium oxide and contains the aluminium and oxide ions 5. Graphite electrodes are used 6. Aluminium ion reduced to aluminium metal at the cathode which is molten and is tapped off. 7. Oxide ion is oxidized to Oxygen gas at the anode.
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2
Q

Steps in the extraction of Iron

A
  1. The Iron ore is hematite and magnetite. 2. CO is the reducing agent. 3. Iron ore, Coke, and limestone poured in at the top of the furnace. 4. Hot air blown in at the bottom 5. Hot air reacts with coke(carbon) to form carbon dioxide and the carbon monoxide 6. carbon monoxide reduces the iron ore to iron, which is molten. This is tapped off. 7. Limestone used to remove the main impurity, silicon dioxide in the form of calcium silicate.
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3
Q

Extraction of sucrose from sugar cane

A

Sugar cane ——–> Crusher ——–> Clarification ——–> Filtration ———> Evaporation ———> Vacuum Crystallization —–> Centrifugation Steps: 1. Sugar cane cut up by shredding machine into small chips 2. The chips are then crushed and rolled under spray of hot water, expelling the cane juice (sucrose) which is acidic and dilute. 3. Cane fibre (bagasse) is removed and used for electricity. 4. Calcium hydroxide is added to the cane juice to neutralize it and settle out the impurities. This process is called clarification. 5. Filtration of the clarified cane juice to remove solid impurities 6. Evaporation: The cane juice in made more concentrated by boiling off water 7. Vacuum crystallization - syrup is concentrated to the point of saturation to form sugar crystals mixed in a thick syrup called molasses. 8. Centrifugation: sugar crystals separated from the molasses. and dried.

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4
Q

Steps in producing ethanol from sucrose (FERMENTATION)

A

Fermentation: Process by which microorganisms such as bacteria and fungi break down sugars in the absence of oxygen to form an alcohol and carbon dioxide Steps to produce ethanol (rum) from molasses 1. Molasses is diluted with water 2. Yeast is placed in the dilute molasses and left to ferment for for 48hrs. This produces about 15% ethanol. 3. The ethanol and water mixture is distilled to obtain more concentrated ethanol.

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5
Q

Define isotopy

A

The existence of atoms of a single element that have the same atomic numbers but different number of neutrons

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6
Q

What is are isotopes?

A

Different atoms of the same element with the same atomic number but different number of neutrons

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7
Q

What is a radioactive isotope?

A

An isotope of an element that has an unstable nucleus that will spontaneously undergo radioactive decay to emit small particles of radiation

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8
Q

What are the uses of radioactive isotopes?

A

1.Carbon-14 dating 2.Cancer treatment(radiotherapy) 3.Generation of electricity in nuclear plants 4.Heart pacemakers Tracers

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9
Q

Define relative atomic mass?

A

Relative molecular mass is the average mass of a molecule compared to one-twelfth the mass of a carbon-12 atom

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10
Q

what is the use of a separating funnel

A

To separate immiscible liquids that have different densities or to separate 2 solutes dissolved in the same solvent.

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11
Q

How to separate KI from iodine when both are dissolved in water?

A
  1. Pour the mixture in a separating funnel. 2. Add a solvent such as hexane that will dissolve the iodine, but does not mix with water. 3.The hexane will dissolve the iodine and the water will dissolve the potassium iodide salt. And now the 2 a separated 4. Now use the separating funnel to drain off the more dense mixture, in this case the solution of potassium iodide.
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12
Q

what is an acid?

A

a substance containing hydrogen that can be replaced by a metal to for a salt

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13
Q

What is an acid salt?

A

A salt that is formed when the H+ ions in an acid are only partially replaced by metal or ammonium ions

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14
Q

What is the Basicity of an acid?

A

The number of protons produced per molecule of acid when dissolved in water

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15
Q

What are acid anhydrides

A

compound that reacts with water to form an acid

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16
Q

name 4 examples of acid anydrides

A
  • carbon dioxide
  • sulphur dioxide
  • sulphur trioxide
  • nitrogen dioxide
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17
Q

what is a base?

A

a proton acceptor

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18
Q

what is an alkali

A

a soluble base that dissolves in water to form a solution that contains OH- ions

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19
Q

Name 4 indicators

A
  • litmus
  • phenolpthalein
  • methyl orange
  • screened methyl orange
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20
Q

definition of a weak base

A

partially ionises when dissolved in water

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21
Q

the 4 main groups of oxides are:

A
  • acidic oxides
  • basic oxides
  • amphoteric oxides
  • neutral oxides
22
Q

basic oxides are oxides of _________

A

metals

23
Q

Neutral oxides are oxides of some (1)____________ which do not react with (2)_____________ or (3)_________. examples of neutral oxides are(4)_______________

A
  1. non-metals
  2. acids
  3. alkalis
  4. CO, NO, N2O
24
Q

definition of a salt

A

substance formed when some or all of the H+ ions in an acid have been replaced by metal or ammonium ions

25
Q

The neutralization point or end point of a neutralization reaction is when all of the (1) ___________ and (2)___________ ions have been used up and the final solution has a pH of (3)___________

A
  1. OH-
  2. H+
  3. 7
26
Q

2 ways of determining the end point of a neutralization reaction

A
  1. using an indicator
  2. using temperature change
27
Q

what is the rate of a reaction

A

the change in the concentration of the product or reactant over unit time

28
Q

What does collision theory state?

A
  • That reactions can only occur if particles collide.
  • The particles must collide with enough energy to react
  • The particles must collide with the correct orientation
29
Q

what is meant by a solution becoming more concentrated

A

there are more particles of reactant in the same volume

30
Q

what is the rate of a reaction

A

the change in the concentration of the product or reactant over unit time

31
Q

define heat of combustion

A

the heat change when 1 mol of a compound is completely burned in oxygen

32
Q

define enthalpy or heat of neutralization

A

the heat change when 1 mol of water is produced in a neutralization reaction

33
Q

define enthalpy of solution

A

the heat change when 1 mol of solute completely dissolves in a solvent

34
Q

what is meant by a solution becoming more concentrated

A

there are more particles of reactant in the same volume

35
Q

What does collision theory state?

A
  • That reactions can only occur if particles collide.
  • The particles must collide with enough energy to react
  • The particles must collide with the correct orientation
36
Q

Mnemonic for the different fractions of distilled petroleum

A

Real Great & Noble Kings Don’t Forget Ladies Birthdays

37
Q

Sources of Hydrocarbons

A

Natural gas and petroleum

38
Q

two types of cracking are:

A

-Thermal cracking -Catalytic cracking

39
Q

importance of cracking hydrocarbons

A
  • produce smaller more useful hydrocarbons such as petrol - produces alkenes which are used to make other useful organic compounds such as plastics
40
Q

the 4 analogous groups in organic chemistry

A

alkanes alkenes alcohols(or Alkanols) Carboxylic acids or alkanoic acids

41
Q

reactions of alkanes

A

-combustion -substitution reactions with the halogens

42
Q

Reactions of alkenes

A
  • combustion - addition reactions
43
Q

what is biogas

A

gas produced by anaerobic bacteria when they break down organic matter

44
Q

reactions of ethanol

A
  • burns easily in air or oxygen - reacts with sodium to form sodium ethoxide - reacts with alkanoic acids to form esters - reacts with oxidizing agents to form ethanoic acid - undergoes dehydration to form ethene with conc. H2SO4 as catalyst
45
Q

reactions of aqueous ethanoic acid

A
  • reacts with reactive metals - reacts with metal oxides and metal hydroxides - reacts with metal carbonates
46
Q

definition of isomers

A

organic compounds with same molecular formulae but different structural formulae

47
Q

reactions of esters

A
  • acid hydrolysis - alkaline hydrolysis
48
Q

which type of hydrolysis produces soaps?

A

alkaline hydrolysis

49
Q

saponification

A

process of producing soap

50
Q

comparison of soapy and soapless detergents: 1 - renewable 2- form fats and oils 3- some are biodegradable 4- lather easily in hard water 5- formation of scum 6- all biodegradable 7- cause eutrophication 8- non-renewable 9- manufactured from petroleum 10- do not form scum 11- does not cause eutrophication 12- does not lather easily in hard water

A

1 - soapy 2- soapy 3- soapless 4- soapy 5- soapy 6- soapy 7- soapless 8- soapless 9-soapless 10- soapless 11 - soapy 12- soapless

51
Q

the two types of polymerization

A

addition and condensation

csec chemistry (17 decks)

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