Q4

• what is the name of the process when an acid and alkali react

  neutralisation
• which salt is formed when CaCO3 reacts with sulfuric acid

  calcium sulfate
• After an ore has been mined, the process of ___ removes the metal from the ore.

  filtration
• certain ___ metals like gold are found as pure metals rather than ores in the earth

  unreactive
• what element is commonly used to reduce iron oxide

  carbon
• what process is usually used to extract metals more reactive than carbon

  electrolysis
• in order for electrolysis the metal ore must be in a ___ form

  molten or liquid
• during electrolysis at which electrode do negative ions accumulate

  positive
• silver does not corrode in air or water. what word can we use to describe this property of silver?

  unreactive or inert
• copper sulfate is a soluble salt that can be made from copper oxide and which acid?

  sulfuric acid
• salt solutions can be ___ to give salts

  crystalised
• name the acid used to produce chloride salts

  hydrochloric acid
• a solution was tested with a pH sensor and the reading was found to be 9. Is the solution of an acid or an alkali?

  alkali
• what salt is produced when copper oxide reacts with hydrochloric acid?

  copper chloride
• True or false? A metal will always be produced at one electrode during electrolysis

  false
• during electrolysis of sodium chloride solution, what is produced at the positive electrode?

  chlorine
• when an iron rusts, it gains oxygen. This means it is a(n) ___ reaction


  oxidation
• Which acid has the lower pH?

  0.5mol/dm3 sulfuric acid or 0.5mol/dm3 of ethanoic acid

  sulfuric acid has the lower pH.

  -sulfuric acid is a strong acid and ethanoic acid is a weak acid. Strong acids have a lower pH than weak acids
• True or False?

  Strong acids ionise in water but weak acids do not.

  False

  weak acids partially ionise in water.
• Oxidation reactions involve the loss of___.


  electrons
• ___ reactions involve both oxidation and reduction.

  Redox

  Redox reactions involve one species losing electrons (oxidation) and another species gaining electrons (reduction)
• If a solution of copper sulfate is electrolysed using copper electrodes , which ion is produced at the anode?

  Copper

  During this electrolysis, copper metal is deposited on the cathode, while copper dissolves from the anode, adding copper ions to the solution. This can be a way of purifying copper.
• When a substance loses hydrogen it has been___

  Oxidised
• When an acid reacts with a carbonate, a salt and water are produced along with anther product. Name the product

  Carbon dioxide
• Is citric acid a weak or a strong acid?

  Weak
• If copper is placed in a solution of zinc sulfate, will the zinc be displaced?

  No

  Copper is less reactive than zinc, so copper will not displace zinc from the zinc sulfate solution.
• Litmus paper is an example of a ... what?

  pH indicator
• Would you expect silver to react with dilute acid?

  No.

  Silver is less reactive than hydrogen.
• Name one of the non-metals that is often included in the reactivity series.

  hydrogen or carbon
• Aluminium can be manufactured by the electrolysis of aluminium oxide and cryolite. What material is the anode made of in this process?

  carbon or graphite
• acid + carbonate= salt + water + ___

  Carbon dioxide
• Potassium hydroxide + sulfuric acid = ___ + water

  Potassium sulfate