Question 4
Metals and their CompoundsWhich of the following will have its mass increased when heated in air?
- A.Helium
- B.Magnesium
- C.Copper pyrites
- D.Glass
Show the answer and explanation
Answer: B (Magnesium)
Explanation
Magnesium burns in air and combines with oxygen to form magnesium oxide, so the product weighs more than the metal. Copper pyrites loses sulphur as SO2 and helium and glass do not react.