Is sugar dissolving in water a physical or chemical change? explain why?

It’s a physical change. Simply because the form of the sugar is not change. For example, if you were to dissolve sugar in water and then let the water evaporate, you would see that the sugar would remain.

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)