1. Imagine you enter your favorite pizza restaurant. Describe what happens at the
particle level that allows you to smell the pizza. Use a particle diagram.

can you attach a picture of the lettuce? : )

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.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.