Module 11

Question 1

Writing net eqn for a sequences of reactions

Answer 1

1. add them all up into a big equation
   (all reactants -> all products)
   1a. If the potential eliminant are of different coefficients, multiply the separate eqns to make them equal)
2. Whatever repeats, you eliminate
3. The eqn you have left is the net eqn
4. Balance the eqn

Question 2

precipitation reaction

Answer 2

1 or more products of the reaction is insoluble in the solution and precipitates from the soln.

Question 3

combustion reaction

Answer 3

A reaction where O2 reacts w/ a molecule to make CO2 + H2O

Question 4

acid-base reactions

Answer 4

An H^+ cation is transferred from one compound to the other
The acid loses it.
The base accepts it.

Question 5

single-replacement reaction

Answer 5

AB +C -> AC +B

Question 6

double replacement reaction

Answer 6

AB + CD –> AD + BC

Question 7

decomposition reaction

Answer 7

AB -> A + B

Question 8

combination reaction

Answer 8

A+B -> AB

Question 9

pH =

Answer 9

• log([H3O^+]/1 mol * L^-1)

Question 10

hydronium cation (H3O^+) =

Answer 10

(10^-pH) mol/L

Question 11

decimals in pH

Answer 11

the amt of decimal places of pH must match the amt of sig figs in its corresponding H3O^+

Question 12

How to find the volume of stock acid to be used in a dilution

Answer 12

1. Find Molarity of [H3O^+] w/ (10^-pH) mol/L
2. Multiply this number w/ the final volume (given) to get moles.
   3.Use mol/M = L to get the liters to be used of the acid

Question 13

Finding limiting reactant

Answer 13

Find the mass product produced by each of the given reactants.
The smallest mass has the limiting reactant.

Question 14

Percent yield

Answer 14

( Actual yield / Theoretical Yield ) * 100%