The burning of magnesium involves a conversion of

Chemical energy to heat energy

Explanation:

Magnesium metal when exposed to flame, it react with the oxygen in air to form white colored powered, known as magnesium oxide with the evolve of heat.

The balanced chemical reaction is shown below as:-

In the reaction the chemical energy which is stored in the chemical bonds of the magnesium and oxygen gas releases which makes the molecules surrounding the system gets heat up and thus, changes to thermal or heat energy.

Thus, The burning of magnesium involves a conversion of chemical energy to heat energy.

passing a magnet thought the

mixture , because iron gets attracted to magnet .

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons