Question

Coal consists of nearly pure carbon, an element. When coal burns in air, it combines with the element oxygen from the air. Which of the following best describes the product of burning coal

carbon dioxide, a heterogeneous mixture of atoms of carbon and oxygen

carbon dioxide, a homogeneous mixture of atoms of carbon gas and oxygen gas

carbon dioxide, a compound of atoms of carbon and oxygen

water, a heterogeneous mixture of atoms of hydrogen and oxygen

Answer 1

The best description of the product of burning coal is:

**carbon dioxide, a compound of atoms of carbon and oxygen.**

When coal burns, carbon in the coal combines with oxygen in the air to form carbon dioxide (CO₂), which is a chemical compound, not a mixture.