Question

In lab Review Lecture 8 Name 2 points for each answer Lab, morning noon afternoon Define an exothermic reaction. 1. 2. Does breaking a chemical bond require energy or give off energy? Is it endothermic or exothermic? Define the term entropy 3. 4. Write the equilibrium equation for the following reaction NH,NO, (s) N,O (g) + 2 H,O (g) For the reaction in question 4, what would be the change in the concentrations of reactants 5. and products if % of the NHNO, (s) was removed?

Answer 1

1. A reaction which results with the production of heat is called an exothermic reaction.

2. A bond can be broken only after sufficient energy is given to it. So, breaking of a chemical bond always requires energy. As energy is absorbed, bond breaking is always an endothermic reaction.

3. The degree of randomness or disorderness of a system or a particle is called entropy.

4. The equilibrium equation is:

K = [N₂O][H₂O]²

5. NH₄OH is a solid reactant which does not appear in the equilibrium constant expression. So, removing it or reducing it's concentration will not affect the concentration of the reactant or the products.