(Use ↑ and ↓ please)

How do we call a reaction where a substance burns in oxygen?

It's a combustion.

Combustions are part of what class of chemical reactions?

Combustions are oxidations

This reaction produces heat. It is an ... reaction.

exothermic

The white solid produced by combustion is magnesium oxide. Write down its chemical formula!

MgO .

What is the meaning of the blue color of bromothymol?

It means that MgO reacts with water to form a base (hydroxide).

It's magnesium hydoxide. Formula? Description?

Magnesium hydoxide. Mg(OH)2. It's a white solid substance soluble in water.

Write down the equations of the two observed reactions!

2Mg+O2→ 2MgO MgO+H2O→ Mg(OH)2