20 points give two examples of elements and two examples of compounds. (4 points) 16. consider a hypothetical reaction in which a and b are reactants, and c and d are products. if 22 grams of a completely reacts with 14 grams of b to produce 9 grams of c, how many grams of d will be produced? show all work! what law does this question demonstrate? (4 points) 17. honors only: give an example of a chemical formula and describe all of the information the formula tells you about the compound. (4 points)

Phosgene (carbonyl chloride), cocl2, is an extremely toxic gas that is used in manufacturing certain dyes and plastics. phosgene can be produced by reacting carbon monoxide and chlorine gas at high temperatures: co(g) cl2(g)⇌cocl2(g) carbon monoxide and chlorine gas are allowed to react in a sealed vessel at 477 ∘c . at equilibrium, the concentrations were measured and the following results obtained: gas partial pressure (atm) co 0.830 cl2 1.30 cocl2 0.220 what is the equilibrium constant, kp, of this reaction

Na chemical reaction, activation energy increases the of the reactants. this outcome causes the particles to collide, which results in the of new products.

Which of these is a density dependent factor? a. epidemic b. earthquake c. drought d. hurricane