questions chem

• If a student measures a reaction for 10 minutes but the measurements stops why is this

  • how fast the reactants have been used up/limited reacting
  • all product has been formed
• How can a student check that a reaction had been reacted completely

  • repeat the experiment
  • until there is a constant value on mass balance
• 6 marker how are catalyst used in industry in chemistry

  • increases the rate of reaction,chemically unchanged,doesn't used
  • particles have minimum amount of energy needed for a reaction to occur (activation energy) catalyst provides an alternative pathway with lower activation energy
  • used in haber process,cracking
• describe one change made to this appartus to measure oxygen in the air

  measuring cylinder,measures the amount of oxygen used up

  
• properties plastic should have when used to wrap food

  • flexible so it can wrap all around the food
  • unreactive so it doesn't react with the food