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)

The two examples are

a) elements: Carbon and hydrogen  : C(s)   and H2(g)

b) compounds: CO2 and CH4

The reaction is

A + B  > C  + D

We know that from law of conservation of mass

Mass of reactants reacted = mass or products formed

Mass of A = 22

Mass of B = 14

Mass of C = 9

Mass of D = (A + B) - (C) = 27 g

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.