List two observations which make a chemical equation more informative with an example

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Solution

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$W e c a n m a k e a c h e m i c a l e q u a t i o n m o r e i n f o r m a t i v e b y : - a) S t a t i n g t h e p h y s i c a l s t a t e o f r e a c \tan t a n d p r o d u c t s F o r e . g w a t e r w h e n h e a t e d u p t o 100 d e g r e e c e n t i g r a d e f o r m s w a t e r v a p o u r . H_{2} O (l) \to_{∆}^{100 ° C} H_{2} O (g) b) S t a t i n g t h e e v o l v e d g a s e s b y a n u p w a r d a r r o w i n t h e c h e m i c a l r e a c t i o n . F o r e . g W h e n y o u a d d H C l o v e r Z n m e t a l . c o l o u r l e s s H 2 g a s i s e v o l v e d w h i c h b u r n s w i t h a p o p s o u n d . Z n (s) + 2 H C l (a q) \to Z n C l_{2} (a q) + H_{2} (↑)$

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