Question

which of the following are new substances of matter formed by the burning of wood.
□ light
□ heat
□ ash
□ smoke

Explanation:

To determine new substances of matter formed by burning wood, we analyze each option:

• Light and heat are forms of energy, not matter (substances with mass and volume).
• Ash (solid residue, e.g., metal oxides, carbon) and smoke (mixture of solid particles and gases like CO₂, soot) are new matter formed from the chemical reaction of wood (cellulose, lignin) burning.

Answer:

• ash (checked)
• smoke (checked)
• light (uncheck)
• heat (uncheck)