Question

PLEASE HELP !!!!!!!!!!!!! 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)

Answer 1

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