HARDER PAPER 1 QUESTIONS

• What is displacement reaction used for?


  To extract metal from ore
• Metal and acid is


  Salt and hydrogen
• What is used to obtain ore

  Copper oxide
• What is the product lifestyle cycle?


  Obtaining raw materials, manufacturing and packaging,use and operation, disposal 
• Why can you find pure gold 


  Because it's unreactive
• Metal and steam


  Is base and hydrogen
• Metal and acid


  Salt and hydrogen
• If metal is less reactive than carbon how is it extracted from compound? 


  Carbon
• H+(aq) + OH-(aq) → H2O(l)
• What is the first step in the procedure described?

  Add some dilute hydrochloric acid to a beaker
• What is the next step after adding the powdered reactant to the acid?

  Filter the mixture in the beaker to remove the excess powder
• Why is it necessary to filter the mixture?

  To remove the excess powder
• What is the overall process to obtain pure dry crystals of salt from the reaction?

  1. Add dilute hydrochloric acid to a beaker.
  2. Add powdered insoluble reactant gradually while stirring.
  3. Filter the mixture to remove excess powder.
  4. Evaporate the water to obtain pure dry crystals.
• What indicates that the powdered reactant is in excess during the reaction?

  Some unreacted powder is left over
• How should the powdered insoluble reactant be added to the acid?

  One spatula at a time, stirring to mix
• Oxidation happens at the


  Anode(positve electrode)
• Reduction happens at the

  Cathode(negative electrode)
• positively charged cations migrate to the negatively charged cathodeb
• negatively charged cation migrate to the positively charged anode
• Copper sulphite electrolysis has chlorine gas at anode and copper at cathode
• Sodium calorie electrolysis has chlorine at and hydrogen at cathode
• place some sulfuric acid in a conical flask and warm it in a water bath add a spatula of copper oxide powder to the acid and stir with a glass rod continue adding copper oxide powder until it is in excess filter the mixture to remove the excess copper oxide pour the filtrate (the copper sulfate solution) into an evaporating basin heat the copper sulfate solution to evaporate half of the water pour the solution into a watch glass and leave to allow all of the water to evaporate