Differentiate between a physical change and a chemical change. Give examples to substantiate your answer. [5 MARKS]

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Solution

Differences with examples: 5 Marks

$\begin{matrix} P h y s i c a l & C h e m i c a l C o m p o s i t i o n o f t h e s u b s t a n c e d o e s n o t & C o m p o s i t i o n o f t h e s u b s t a n c e c h a n g e s . c h a n g e . M o s t c h a n g e s a r e r e v e r s i b l e . & M o s t c h a n g e s a r e i r r e v e r s i b l e . N o n e w s u b s t a n c e s a r e f o r m e d, e . g, & N e w s u b s t a n c e s a r e f o r m e d, e . g, I c e \to W a t e r \to S t e a m & B u r n i n g o f P a p e r \to A s h e s F o r e x a m p l e, m e l t i n g o f i c e, d i s s o l v i n g s a l t i n & F o r e x a m p l e, r u s t i n g o f i r o n, d e c a y o f f o o d w a t e r P h y s i c a l c h a n g e s a r e t h o s e c h a n g e s w h i c h & C h e m i c a l c h a n g e s i n v o l v e c h a n g e i n c h e m i c a l i n v o l v e c h a n g e i n o n l y p h y s i c a l p r o p e r t i e s l i k e, & p r o p e r t i e s o f t h e s u b s t a n c e s a n d c h a n g e i n c o l o r, s i z e, s h a p e a n d s t a t e o f s u b s t a n c e s e t c . & c h e m i c a l c o m p o s i t i o n a l s o . \end{matrix}$

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Differentiate between physical change and chemical change. [5 MARKS]

Differentiate between physical and chemical change with an example of each. [3 MARKS]

(a) What is a physical change ? Give two examples of physical changes.

(b) What is chemical change ? Give two examples of chemical changes.

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