Yr 10 chemistry EOY exa

• Read the question CAREFULLY (e.g. - state the SYMBOL)
• What charge on ions formed ? DON'T say NEGATIVE CHARGE ION, WRITE -1
• Effervescence is the same as FIZZES on surface when Sodium is placed in water. Why the UI is  alkali when sodium is added to water - because solution formed is a alkali (sodium hydroxide)
• State the colour the flame becomes Yellow/orange when a piece of platinum wire is dipped into a solution in a trough then held in a roaring bunsen flame. 
• Relative mass for electron is 1/2000 NOT NOT NOT NOT NOT NOT ZERO 0 
• Outline how a sample of pure propanone can be obtained from mixture : 1) Proponane boils before water 2)Heat 3) stop collecting condensate after 56c