Q1.What is :

i.acceleration due to gravity
ii.chemical energy

Kindly refer to the links given below to get your answer : 


https://www.meritnation.com/ask-answer/question/what-is-acceleration-due-to-gravity/gravitation/9351953


https://www.meritnation.com/ask-answer/question/what-is-chemical-energy/academics/1479748