Strange question. either you have lit some magnesium (in which case you have observed it burn) or not. The evidence is in the burning.
Magnesium, of course, burns with a typical intense white flame
Some evidence that a chemical change is occurring when magnesium is burning in the presence of oxygen include the formation of a white powdery substance (magnesium oxide), the emission of light and heat, and the change in physical properties of the magnesium (e.g., color change or formation of ash).
After burning of magnesium MgO (magnesium oxide) is obtained.
magnesium + oxygen gas ----D magnesium oxide
The product name for magnesium burning is magnesium oxide, which forms when magnesium reacts with oxygen in the air.
Burning magnesium will go out in carbon dioxide gas.
This is a chemical change, like any other burning reaction: magnesium is turned into magnesium oxide by burning reaction with oxygen (from air). 2Mg + O2 --> 2MgO
Burning a magnesium ribbon is a chemical change because the magnesium reacts with oxygen in the air to form magnesium oxide. This results in a new substance being formed with different chemical properties than the original magnesium ribbon.
The color of the flame produced by burning magnesium is a bright white.
magnesium look like white powder after burning in air. magnesium burns in air n react with atmospheric oxygen n forms magnesium oxide which is a white powder.
The product of the magnesium burning is magnesium oxide (MgO).
During burning magnesium is transformed in magnesium oxide - a chemical reaction:2 Mg + O2 = 2 MgO