When magnesium is heated at a high temperature and burnt in the presence of oxygen, magnesium oxide is formed. The reaction is interesting, due to the fact a burst of bright light is produced during the burning process. The magnesium and oxygen molecules combine in the high temperature conditions to form magnesium oxide, which is a molecule that combines atoms of both elements. The elements of oxygen and magnesium therefore have undergone a change in properties.
- Why is a flash of light produced in the reaction?
It is uncommon for a flash of light to be produced in a regular chemical reaction; most reactions are more sedate. The flash of light is produced because in the high temperature conditions, the reaction between magnesium and oxygen is intense. It takes place at a very high speed. The flash of light exists because the energy is released at a swift pace. This release of energy can be seen in a visual form.
In chemical reactions, elements and compounds rearrange the composition of their atoms to produce new chemicals. As this happens, a change in energy usually takes place. In most cases - and in the case of magnesium and oxygen - energy is released from the reaction. This can be in a variety of forms, included light, heat and sound. Explosions occur when a very intense energy release occurs.
When an experiment involves a chemical reaction, it is important to take safety precautions in case the energy release is violent. These precautions involve wearing the correct safety eyewear and wearing a lab coat. You should also be sure to tie long hair back, and always follow the instructions of the lab advisor.
