chemistry oct nov 2022

• A student prepares calcium nitrate , Ca(NO3)2 , by adding calcium carbonate to dilute nitric acid

  (a) write an equation for this reaction

  CaCO+ 2 HNo3 > Ca ( No3)2 + Co2 + H2O
• State the term given to describe the structure of diamond

  Giant covalent
• State the term given to a reaction in which a substance burns

  Combustion
• Suggest why more crystals of magnesium sulfate appear when cooled

  solubility decreases
• The reaction between aluminium oxide and sodium hydroxide forms a salt and water containing the negative ion AlO2- .

  The only other product is water

  Write chemical equation

  2NaOH + Al2O3 > 2NaAlO2 + H2O
• Balance the equation : PCl5 + P4O10 > POCl3

  6 , non , 10
• Name two substances used to break down amino acids

  water

  acids