Question

categorize each change as physical change or chemical change.
a butane lighter produces a flame
a screwdriver left outside in the rain rusts
rubbing alcohol evaporates
silver tarnishes upon exposure to the air sugar dissolves in water
barium hydroxide mixed with ammonium chloride becomes colder
water boils
physical change chemical change

Explanation:

• Physical change: A change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (e.g., evaporation, boiling), dissolution (sugar dissolving in water).
• Chemical change: A change that results in the formation of new substances with different chemical properties. Indicators include production of heat/light (butane lighter flame), color change (silver tarnishing), gas production, precipitate formation, or a change in temperature due to a chemical reaction (barium hydroxide - ammonium chloride reaction, rusting which is an oxidation reaction).

Answer:

• Physical Change: Rubbing alcohol evaporates, Sugar dissolves in water, Water boils.
• Chemical Change: A butane lighter produces a flame, A screwdriver left outside in the rain rusts, Silver tarnishes upon exposure to the air, Barium hydroxide mixed with ammonium chloride becomes colder.