Final answer:
Not all physical changes involve chemical changes, as seen with ice melting into water where no new substances are formed. However, all chemical changes involve physical changes, as seen with burning wood where the wood visibly and physically changes into ash and gas.
Step-by-step explanation:
I agree with the statement that not all physical changes are accompanied by chemical changes, but all chemical changes are accompanied by a physical change. A physical change is a change in which no new substances are formed. For example, when ice melts into water, that's a physical change. The water molecules are the same in the solid ice and the liquid water, they're just arranged differently.
On the other hand, a chemical change leads to the formation of one or more new substances. For example, when you burn a piece of wood, this is a chemical change. The wood turns into ash, smoke, and gases, all of which are new materials with different properties from the original wood. However, this chemical change also involves a physical change, as you can see and feel the wood turning into ash and gases.
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