Chemistry - C2b Topics 4,5 & 6

Revision Summary Questions

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  • Created by: KyahG
  • Created on: 06-03-14 21:47
Give two typical properties of metals.
Good conductors of electricity and malleable.
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Name two properties shared by transition metals.
High melting points and they form colourful componds.
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Describe how the structure of metal allows it to conduct electricity.
Metallic bonds give the metal a giant structure consisting of positive ions and free electrons. This creates a 'sea' of delocalised electrons throughout the metal which makes it a good conductor of electricity.
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Is the following statement true or false? "Alkali metals have high melting points"
False. Alkali metals have low melting points.
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Potassium is a group 1 element. When placed in water, a lump of potassium violently explodes. A) Name the gas produced in this reaction. B) Describe how the pH of water changes during this experiment.
A) Hydrogen B) The pH of the water would rise because the reaction makes an alkali solution.
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What is the physical state of bromine at room temperature?
Liquid
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Do hydrogen halides dissolve in water to form acidic or alkaline solution?
Acidic
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Explain why halogens become less reactive as their atomic number increases.
The higher up an element in group 7 is, the more reactive it is. This is because the outer shell is nearer to the nucleus, so the pull from the positive nucleus is greater which attracts extra electrons more strongly.
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What is a displacement reaction?
If a reactive element comes into contact with the compound of a less reactive element a chemical reaction may take place. The less reactive element is removed from the compound and replaced by the more reactive element.
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Name an element that would displace chlorine from a solution of a chloride.
Flourine
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Explain why noble gases are inert.
They have a full outer shell therefore they don't react with much at all.
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Name two noble gases and state a use for each.
Argon - Used to provide an inert atmosphere in filament lamps (light bulbs) Helium - Used in airships and party balloons.
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What is an exothermic reaction?
An exothermic reaction is one which overall gives out energy to the surroundings in the form of heat, ex. - Explosions.
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What is an endothermic reaction?
An endothermic reaction is one which overall takes in energy from the surroundings in the form of heat, ex. - Photosynthesis
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Is bond breaking an endothermic or exothermic process?
Endothermic
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How would you measure the temperature change during a neutralisation reaction?
You can measure the amount of energy produced by a chemical reaction in a solution by taking the temperature of the reactants, mixing them and then measuring the temperature of the solution at the end of the reaction.
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What are the four factors that affect the rate of reaction?
Temperature, concentration (pressure for gases), catalyst and surface area of a solid (or size of particles)
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Name a reaction which happens quickly and a reaction that happens slowly.
Quickly - Explosion, Slowly - Rusting of iron.
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What is the definition of a catalyst?
A catalyst is a substance which changes the speed of a reaction, without being used up in the reaction.
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What is the role of a catalytic converter in car exhausts?
It increases the rate at which carbon monoxide and unburnt fuel in exhaust gases react with oxygen in the air to produce carbon dioxide and water.
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Excluding catalysts, explain how each of the other three factors which affect reaction rates increase the frequency of collisions between particles.
Temperature - When the temperature is increased the particles move quicker. Concentration - The higher the concentration the more particles of a reactant there are. Surface Area - The particles have a larger surface area to react with.
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What is the formula for percentage yield?
Percentage yield = actual yield (grams) / Theoretical yield (grams) X 100
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How does percentage yield differ from actual yield?
Percentage yield tells you about the overall success of an experiment. It compares what you think you should get (theoretical yield) with what you get in practice (actual yield)
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Outline two factors that may prevent the percentage yield of a reaction being 100%.
Incomplete reactions and practical losses during preparation.
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Other cards in this set

Card 2

Front

Name two properties shared by transition metals.

Back

High melting points and they form colourful componds.

Card 3

Front

Describe how the structure of metal allows it to conduct electricity.

Back

Preview of the front of card 3

Card 4

Front

Is the following statement true or false? "Alkali metals have high melting points"

Back

Preview of the front of card 4

Card 5

Front

Potassium is a group 1 element. When placed in water, a lump of potassium violently explodes. A) Name the gas produced in this reaction. B) Describe how the pH of water changes during this experiment.

Back

Preview of the front of card 5
View more cards

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