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23 Cards in this Set

  • Front
  • Back
1.6g of methane was burnt in a limited supply of oxygen. The equation for the reaction is: 2CH4+3O2->2CO+4H2O

i) How many moles of methane were burnt? [2]
ii) Calculate the mass of oxygen used. [2]
iii) The volume of methane was 2400cm3. What volume of oxygen, measured under the same conditions, reacted with this volume of methane? [2]

i) 0.2mol
ii) 9.6g
iii) 3600cm3
i) What is the general formula of the alkene series? [1]
ii) Give one other general characteristic of the alkene series. [1]
i) CnH2n
ii) Either: - Same general formula
- Same functional group
- Similar physical properties
i) Name the reagent that will convert ethanol to ethanoic acid. [1]
ii) Is the reagent an oxidising or reducing agent? [1 for answer, 2 for explanation]
i) Oxygen (from air or Potassium Dichromate K2Cr2O4)
ii) Answer: Oxidising
Explanation: Loses oxygen
Chlorine is a powerful oxidising agent, which is used for bleaching.

i) Why is chlorine added to drinking water? [1]
ii) With the aid of an equation, describe the bleaching action of chlorine. [2]
i) To sterilize water
ii) Cl2+H20->HCl+HOCl
What is the name of all Group 1 elements?
Alkali Metals
i) Explain the meaning of the term 'element'.
ii) Explain what is meant by the term giant structure.
iii) Silicon carbide, SiC, has a structure like that of diamond. Use your knowledge of the Periodic Table to suggest why silicon carbide has a similar structure to diamond.
i) A substance that contains only one type of atom.
ii) Structure containing hundreds of thousands of atoms joined by strong covalent bonds (contextual: diamond)
iii) Silicon also has 4 electrons in its outermost shell.
State one use of sodium carbonate.
Either: - Manufacture of glass
- Manufacture of detergents
- To soften hard water
Describe two reactions by which carbon monoxide is formed in the blast furnace.
C+O2->CO2

CO2+C->CO
What is meant by reduction?
Reduction Is Gain of electrons (OIL RIG - Oxidation Is Loss of electrons, Reduction Is Gain)
Describe how slag is formed in the furnace.
Calcium carbonate forms calcium oxide and carbon dioxide. Calcium combines with sand (an impurity) to form slag.
State one use of ammonia in industry.
- Refridgerator coolant
- Fertilizer
Name the three materials added into the blast furnace.
- Ore/Haematite
- Coke (acts as fuel)
- Limestone (removes impurities)
Describe a test for ammonia:

- Test
- Results
Test - Damp red litmus paper
Results - Paper turns blue
Hydrogen chloride does not conduct electricity but its solution in water does conduct electricity. Explain why this is so.
It is a covalent compound, thus it COMPLETELY ionizes in water.
What colour change takes place when an aqueous solution of hydrogen chloride is added to litmus paper?
Turns red (aciD, reD; Base, Blue)
Write down the symbol for an acidic oxide.
C or
N or
S
Describe a chemical test for chlorine.
- Test
- Observation
Test: Damp blue litmus paper
Observation: Bleaches
What gas is formed when:
i) Sodium hydroxide solution is warmed with ammonium chloride?
ii) Write a balanced equation for the reaction between dilute sulphuric acid and sodium carbonate.
iii) Give two examples of insoluble salts.
i)Ammonia (since alkali+ammonium salts->salt+ammonia gas+water)
ii)H2SO4(aq)+Na2CO3(s)->Na2SO4(aq)+H20(l)+CO2(g)
iii)To be filled
Sodium fluoride has a giant structure.
i) What is a giant structure?
i) Lattice structure (contextual: compound)
When sodium and chlorine combine, electron transfer takes place and ions are formed.
i) What electron transfer takes place?
ii) Give one similarity and one difference between sodium and fluorine ions.
i) Sodium transfers one electron, fluorine gets one electron.
ii) Similarity either: -Same number of electrons (in their shells)
- Same number of shells
Different - Number of protons.
State one use for ethanol.
For sterilising.
Suggest a reason why hot air is blown in from the bottom of the furnace.
To maintain high temperatures in the furnace.
Calculate the mass of iron formed from iron (III) oxide.
Fe2O3+3CO->2Fe+3CO2
Mr(Fe2O3)=Ar(Fe)x2+Ar(O)x3
=(56x2)+(16x3)
=112+48

Mol=Mass(g)/Mr=1600/160=10