Chemistry 2 Lesson Review

Chemistry 2 Lesson Review

4th Quarter Exams

Multiple Choice

When you sweat, your body must supply heat so that the sweat evaporates.

This is an example of

• an endothermic reaction

• an exothermic reaction

Multiple Choice

The burning of carbon-containing compounds uses oxygen, from air, and produces carbon dioxide, water, and lots of heat.

• an endothermic reaction

• an exothermic reaction

Multiple Choice

When ammonium nitrate was dissolved in the water felt cold after the reaction, This is an example of:

• endothermic process because the reactant is dissolved in a liquid thus changing its state

• endothermic process as the process breaks the bonds of ammonium nitrate into ammonium and nitrate separately

• exothermic process as there is the release of heat during the process of breaking the bonds of ammonium nitrate

• exothermic process as the process forms the bonds of ammonium nitrate

Breaking bonds demands/requires energy!

Forming bonds releases energy!

Endothermic -breaking bonds

Exothermic - forming bonds

Multiple Choice

The energy we intake in form of food is stored in our body and part of it is lost in our activities or dissipated as body heat. The energy being transferred from one system to another and transformed from one form to another. This is an example situation evident in the first law of thermodynamics which states that:

• Law of Conservation of Energy, states that energy cannot be created or destroyed in an isolated system.

• law of thermodynamics states that the entropy of any isolated system always increases.

• entropy of a system approaches a constant value as the temperature approaches absolute zero.