I smell onions. It is 85°F outside today.
It will be a long, hot summer.
My dog weighs 45 pounds.
My dog will bark at the vacuum cleaner
although he has never seen it before.
My mother is going to cook spaghetti for
supper next Tuesday.
Prediction
Observation

Observation

-I smell onions

-My dog weighs 45 pounds

-It is 85 degrees outside today

Predictions

-My dog will bark at the vacuum cleaner

although he has never seen it before

-My mother is going to cook spaghetti for

supper next Tuesday

-It will be a long, hot summer

Explanation:

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.