chemistry concepts up to mid term 1

Question 1

write the reaction of the product HCl in its standard form

Answer 1

1/2H2+1/2Cl2= HCl

Question 2

in a combustion explain why the first step decompose reactants to elements is negative and the second step form products from elements is positive

Answer 2

this is because the first step breaks bonds releasing energy and the next forms which takes in energy.