Gases in the atmosphere, Gases in reactions & carbon dioxide

• what is the percentage of nitrogen in our aptmoshpere ?

  78%
• what is the percentage of oxygen in our aptmosphere ?

  21%
• what is the percentage of argon in our aptmosphere ?

  nearly 1%
• what is the percentage of carbon dioxide in our atmosphere ?

  0.04%
• what happens when a element is burnt in air ?

  it reacts with oxygen to form an oxide
• 3 main examples of reactants with oxygen ?

  magnesium , hydrogen, sulfur
• describe how magnesium reacts with oxygen ?

  • burns with a bright white flame in air with a white powder
  • magnesium oxide is formed
  • magnesium oxide is slightly alkaline when dissolved in water
• describe how hydrogen reacts with oxygen ?

  • burns very easily and explosive
  • forms a pale blue flame and the only product is water
  • resulting explosion makes a squeaky pop
• describe how sulfur reacts with oxygen ?

  • burns with pale blue flame
  • product is sulfur dioxide
  • sulfur dioxide is acidic when dissolved in water
• what do you get if you heat a metal carbonate ?

  Metal oxide and carbon dioxide
• what affects the amount of carbon dioxide in the atmosphere ?

  human activities
• examples of human activites affecting the amount of carbon dioxide in the atmosphere ?

  • deforestation
  • burning fossil fuels
• general equation for reactions of metals ?

  Metal + Acid → Salt + Hydrogen
• what is the general equations for some metals reacting with water ?

  Metal + Water -> Metal Hydroxide + Hydrogen
• which reactive metals will react vigorously with water ?

  Potassium, sodium, lithium and calcium
• list the order of the reactivity series ?

  Potassium

  Sodium

  Calcium

  Magnesium

  Aluminum

  Zinc

  Iron

  Lead,

  Copper

  Silver

  Gold
• memory song for reactivity series ?

  potatoes so creamy make all zebras in love considering shiny grass