What percentage of the atmosphere is nitrogen?

78% of the atmosphere is nitrogen.

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What percentage of the atmosphere is oxygen?

21% of the atmosphere is oxygen.

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What is the equation for the combustion (burning) of magnesium in oxygen?


What colour will the flame be?

2Mg(s) + O2(g) ➔ 2MgO(s)


Burning magnesium produces a white flame.

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Is magnesium oxide acidic, neutral, or alkaline, when dissolved in water?

Magnesium oxide is alkaline when it's dissolved in water.

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What is the equation for the combustion (burning) of hydrogen in oxygen?


What colour will the flame be?

2H2(g) + O2(g) ➔ 2H2O(g)


Pale blue flame.

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Is water acidic, neutral, or alkaline?

Water is neutral.

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What is the equation for the combustion (burning) of sulfur in oxygen?


What colour will the flame be? 

S(s) + O2(g) ➔ SO2(g)


Pale blue flame.

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What is the equation for the combustion (burning) of sulfur in oxygen? What colour will the flame be? 

S(s) + O2(g) ➔ SO2(g)


Pale blue flame.

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Is sulfur dioxide acidic, neutral, or alkaline, when dissolved in water?

Sulfur dioxide is acidic when it's dissolved in water.

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What does ‘thermal decomposition’ mean?

'Thermal decomposition' means to break something down using heat. This makes sense because thermal refers to heat, and decomposition means to decompose or break down.

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What is the equation for the thermal decomposition of a metal carbonate?

Metal Carbonate ➔ Metal Oxide + Carbon Dioxide

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