WS Equilibrium

4. the principle that in a reversible reaction the ratio of the rate of the forward reaction to the rate of the reverse reaction is a constant for that reaction
5. measures the relative amounts of products and reactants present during a reaction at a particular point in time
9. a chemical reaction where the reactants form products that, in turn, react together to give the reactants back
11. is the state of a system in which the rate of the forward reaction is equal to the rate of the reverse reaction
12. expresses the relationship between products and reactants of a reaction at ___________ with respect to a specific unit
13. heat is absorbed by the system from the surroundings
14. the sum of the internal energy and the product of pressure and volume
17. a system whose reactants, products, or both are in more than one phase is a

1. if heat is released by the system into the surroundings
2. When the products and reactants of an equilibrium reaction form a single phase, whether gas or liquid, the system is a
3. a substance that is present at the start of a chemical reaction
6. is used in the manufacturing of ammonia from nitrogen and hydrogen, and then goes on to explain the reasons for the conditions used in the process
7. the minimum energy that colliding particles must have in order to undergo a reaction
8. states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change to reestablish an equilibrium
10. the time needed for a change in concentration to occur
15. a natural physical system that does not allow transfer of matter in or out of the system
16. a substance that is present at the end of a chemical reaction