CHEMISTRY QUESTIONS

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  • Created by: jp3louis
  • Created on: 14-06-16 19:37
Which ion causes PH's to be 2.9?
Hydrogen
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Write the equation for the reaction of zinc metal with sulfuric acid.
Zn+H2SO4----- ZnSO4 + H2
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Whats the equation to work out the relative formula mass of a substance in grams, known as one mole of that substance?
number of moles = mass of g/mr
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How do you work out the percentage mass of an element in a compound?
Ar X number of atoms of the element you want/ Mr of the whole compound.
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How do we work out empirical formula?
List the elements, write there experimental masses, divide each one by Ar, Turn the numbers into a ratio.
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how do you work out how to calculate a mass in a reaction?
Write out the balanced equation, work out the Mr, divide to get one.
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Whats the half equation for when zinc chloride is moved to the positive electrode?
2cl- ---------- cl2 + 2e-
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Suggest why carbon nanotubes are used as lubricants.
Nanotubes can slide as there are no bonds between the tubes.
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Describe what happens when Magnesium ions (mg 2+) react with oxygen (o2-) to produce magensium oxide.
Magnesium looses electrons due to oxidation. Oxygen gains electrons due to reduction. This makes a full outer shell.
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Glass melts at a lower point than silicon dioxide. Why>
Weaker bonds when more things are put together.
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Give the formula of sodium oxide.
Na2O
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Describe the structure of a metal?
Lattice of positive and negative bonds with delocalised electrons.
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Name the gas produced when lithium reacts with water to produce a gas and an alkaline solution
Hydrogen.
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Which ion causes the solution to be alkaline in a reaction with lithium and water.
Hydroxide.
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Ethanoic acid is formed between a reaction of what?
Ethanol and oxygen.
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The alcohol used to make propyl ethanoate has the formula CH3Ch2CH2OH. Name this alcohol?
Propanol (3 carbons)
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An inside of a pan becomes coated with a white solid. Explain how this white solid is produced.
Water contains calcium which decomposes to make calcium carbonate when heated.
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Explain why a temperature of 450 is the optimum temperature for the harber process.
More yield and more collisons.
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Why do water filters at home contain particles of silver?
To kill microbes.
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Give the name of the carbonate in scaled.
Calcium carbonate.
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When acids react, a gas is produced. What is it
Co2
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Why does hydrochloric acid react faster than ethanoic acid?
Lower PH so it ionises more.
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WHy should we not use hydrochloric acid to dissolve scale in kettles?
Corrosive.
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WHy is a pressure lower than 200 not used for the harber process?
Lower yield.
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How is ammonia got from the harber process.
It cools and liquidfies.
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Describe a test to show that barium chloride solution contains chloride ions.
Silver nitrate solution+ nitric acid = white precipitate.
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Name the type of reaction between aqueous ammonia solution and an acid?
Neutralisation.
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Why is carbon dioxide a gas even at low temperatures?
Simple molecular structure, these intermolecular forces are weak, so only need a small amount of energy to over come them.
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Other cards in this set

Card 2

Front

Write the equation for the reaction of zinc metal with sulfuric acid.

Back

Zn+H2SO4----- ZnSO4 + H2

Card 3

Front

Whats the equation to work out the relative formula mass of a substance in grams, known as one mole of that substance?

Back

Preview of the front of card 3

Card 4

Front

How do you work out the percentage mass of an element in a compound?

Back

Preview of the front of card 4

Card 5

Front

How do we work out empirical formula?

Back

Preview of the front of card 5
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