Physical and chemical reactions (equations)

QUESTION  1

QUESTION 2

QUESTION 3

QUESTION 4

QUESTION 5

QUESTION 6 

QUESTION 7

QUESTION 8 

QUESTION 9 

QUESTION 10 

QUESTION 10 

QUESTION 11

QUESTION 12

QUESTION 13

QUESTION 14 

QUESTION 15 

QUESTION 16 

QUESTION 17 

QUESTION 18 

QUESTION 19 

QUESTION 20 

QUESTION 21