Question

which of these is an example of a chemical change?
sugar dissolving in water
sawing a piece of wood in half
rocket fuel burning
all of these

Explanation:

A chemical change results in new substances with different chemical properties. Sugar dissolving in water is a physical change as no new substance is formed, just a mixture. Sawing wood is a physical change as it only changes the shape and size. Rocket fuel burning is a chemical change as it involves a combustion reaction producing new substances like gases and heat.

Answer:

C. Rocket fuel burning