Question

Chemical reactions _____.

Answer 1

I put in the answers over there and they weren't all right according to the question.
for number 1 is was D(you got that right), 2 was A.heat is supplied to the reaction(it sowed a triangle symbol, not a yield one). 3 was D(you got this one right). 4 was D. the reaction is reversible. 5 was A.1,3,1, 3 

Answer 2

1) Chemical reactions produce new substances

Ans (d)

2) The symbol, Δ in a chemical reaction means that heat of supplied to the reaction.

Ans (a)

3) A skeleton equations does not show the reaction stoichiometry, i.e. the relative amounts of reactants and products.

Ans (d)