$(a)$ Illustrate with an example that physical and chemical changes can take place together.
$(b)$ Which of the following are chemical changes?
$(i)$ Mixing of iron filings and sand
$(ii)$ Growth of plant
$(iii)$ Rusting of iron
$(iv)$ Freezing of water
$(b)$ Which of the following are chemical changes?
$(i)$ Mixing of iron filings and sand
$(ii)$ Growth of plant
$(iii)$ Rusting of iron
$(iv)$ Freezing of water
(II, III) Burning of a candle: When a candle burns,the wax melts,which is a physical change. Simultaneously,the wax reacts with oxygen to produce $CO_2$ and $H_2O$ vapor,which is a chemical change. Thus,both changes occur together.
$(b)$ The chemical changes are:
$(ii)$ Growth of plant: This involves complex metabolic processes and permanent changes in the organism's structure.
$(iii)$ Rusting of iron: This is a chemical reaction where iron reacts with oxygen and moisture to form hydrated iron$(III)$ oxide.
$(b)$ The chemical changes are:
$(ii)$ Growth of plant: This involves complex metabolic processes and permanent changes in the organism's structure.
$(iii)$ Rusting of iron: This is a chemical reaction where iron reacts with oxygen and moisture to form hydrated iron$(III)$ oxide.
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Similar Questions
Two chemical species $X$ and $Y$ combine together to form a product $P$ which contains both $X$ and $Y$.
$X + Y \to P$
$X$ and $Y$ cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species $X$,$Y$ and $P$ are correct?
$(i)$ $P$ is a compound
$(ii)$ $X$ and $Y$ are compounds
$(iii)$ $X$ and $Y$ are elements
$(iv)$ $P$ has a fixed composition
$X + Y \to P$
$X$ and $Y$ cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species $X$,$Y$ and $P$ are correct?
$(i)$ $P$ is a compound
$(ii)$ $X$ and $Y$ are compounds
$(iii)$ $X$ and $Y$ are elements
$(iv)$ $P$ has a fixed composition
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