Question

which sign is not for a chemical change? a color change b change in volume c transfer of heat or light which statement is true for a chemical change? a identity of the substance is not changing b mass is conserved c the substances always change from solid to liquid which process below would be considered a chemical change? a cutting a piece of wood into pieces b mixing a bowl with two different types of leaves c the burning of wood

Explanation:

• For the first question, color change and transfer of heat or light can be signs of chemical changes. Change in volume is usually a physical - change sign.
• For the second question, in a chemical change, the identity of the substance changes, and the substances don't always change from solid to liquid. Mass is conserved according to the law of conservation of mass.
• For the third question, cutting wood and mixing leaves are physical changes as no new substances are formed. Burning wood is a chemical change as new substances like carbon - dioxide and ash are formed.

Answer:

1. B. change in volume
2. B. mass is conserved
3. C. the burning of wood