Metal Head Silvery

Chemistry Help? (What happens when ...)?
1. What compound would you expect to be formed by reaction between sodium and chlorine?
2. Can you think of a colourless liquid formed from hydrogen and oxygen?
3. When red mercury is headed the solid decomposes to a silvery liquid and colourless gas. The gas relights a glowing splinter of wood.
Complete the word equation for this reaction.
4. Magnesium metal burns in air releasing bright light and forming a white powdered solid compound.
Magnesium + ________________ --> ______________
Any help would be appreciated!!!
NaCl
H2O or H2O2
2HgO --> Hg(l) + O2(g)
Mercury (II) oxide decomposes to form elemental mercury and oxygen gas.
2Mg + O2 --> 2MgO
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