Question

bonus question
draw or write one example of each:
physical change:
chemical change:

Explanation:

• A physical change is a change in which no new substances are formed. Water freezing into ice is a common example. The chemical composition of water (\(H_2O\)) remains the same; only the state of matter changes from liquid to solid.
• A chemical change is a change in which new substances are formed. Burning wood is a typical example. Wood (mainly composed of cellulose, \(C_6H_{10}O_5\)_n) reacts with oxygen (\(O_2\)) to produce carbon dioxide (\(CO_2\)), water (\(H_2O\)), and ash (residue). New substances are created, and the change is irreversible.

Answer:

• Physical change: Water freezing into ice.
• Chemical change: Burning wood.