What does it mean when it says,?

Question

Classify each of the following reactions by type:
then it says
S _8 + 80_ 2 ------> 8SO_2 + heat

[whenever there is a _ before the number, that means the number is small.]

its for science

Answer 1

Your key to the reacting being exothermic is the production of heat ( + heat ).

That's the easiest key to figuring out whether or not it's exothermic or endothermic. There is no heat produced with an endothermic reaction.

Exo - gives off heat
Endo - takes in heat (feels cold)

Answer 2

It means one molecule containing 8 atoms of sulfur combines with 8 molecules, each containing 2 oxygen atoms to yield 8 molecules of sulfur dioxide plus heat. As the others have stated, this is an exothermic reaction.

Answer 3

That reaction is an exothermic synthesis reaction, because one product is formed from two reactants, and the heat released shows that the products have less energy than the reactants, making it exothermic.