CHEMISTRY FINAL (HIGHSCHOOL)

FInal Study Guide For High School Chemistry

Le Chatelier’s Principle

states that if a system at equilibrium is subjected to a change in temperature,pressure,or concentration of reactants of products,the system will adjust to counteract that change and restore a new equilibrium.

Types Of Stresses

1-Change in concentration

2-Change in Temperature

3-Change in pressure (gases only)

4-Addition of catalyst (does NOT shift equilibrium)

Stress:Concentration

Increase reactants—--> shift right (towards products)

Increase product—— >shift left (towards reactants)

PRACTICE QUESTION

1. If more reactant is added to a system,what happens?

ANSWER FOR QUESTION #1

The reactant shifts towards the product

PRACTICE QUESTION #2

2- If more product is added to a system,what happens?

ANSWER FOR QUESTION #2

The reactant will shift towards the product

REACTANT AND PRODUCTS

(REACTANTS) 2H² + O² —> (PRODUCTS) 2H²O

EXAMPLE PROBLEM

C+H2——> CH$

1-What happens to the equilibrium if the concentration of C is increased

2-What happens to the equilibrium if the concentration of CH4 is decreased

ANSWER FOR EXAMPLE PROBLEMS

1- It will shift to the right (towards the