Oxygen and Carbon Dioxide

Question 1

what are the 3 more popular elements that react with oxygen

Answer 1

1) Magnesium - burns with a very bright white flame
2) Sulfur - burns with a blue coloured flame
3) Hydrogen - squeaky pop

Question 2

give an example of a carbonate that decomposes easily to form carbon dioxide

Answer 2

copper(II) Carbonate

Question 3

what happens to copper(II) Carbonate when it burns and what is the equation for this reaction

Answer 3

It breaks down into copper oxide and carbon dioxide

1) Copper carbonate → copper oxide + carbon dioxide
CuCO3 → CuO + CO2

Question 4

what’s the colour change during the burning reaction

Answer 4

copper carbonate is GREEN and copper oxide is BLACK

Question 5

what’s the test for carbon dioxide

Answer 5

Bubble through, or shake carbon dioxide with, an aqueous solution of calcium hydroxide (also called lime water).

The solution will turn from colourless to cloudy.