CHEM 121 MODULE 2 EXAM CURRENTLY
TESTING VERSIONS 2025 WITH
QUESTIONS AND CORRECT DETAILED
ANSWERS/FROM A VERIFIED SOURCE FOR
GUARANTEED PASS!!!
How to calculate molecular weight? - CORRECT ANSWER-add up the
individual atomic weights of each element. Don't forget to multiply an
element's atomic weight by how many atoms of that element there are.
What is a Mole and how to you solve for it? - CORRECT ANSWER-
The amount of chemical reaction of a compound. Moles= gram/
molecular weight
Percent of an element - CORRECT ANSWER-= (weight of an individual
element/ MW of the whole compound) x 100
How to solve for Empirical Formula - CORRECT ANSWER-1. Divide
each each % of an element (this is provided) by it's atomic weight
, 2. Using the results from step 1, divide each of those results by the
smallest number given from that set (round answers to nearest whole
number) ( if one of the answers ends in .25- 1/4, .333- 1/3, .5- 1/2,
.666- 2/3, .75- 3/4 multiply all of the answers by the denominator)
3. The whole numbers become the subscripts. aka the number of atoms
in the element
Combination reaction (synthesis) - CORRECT ANSWER-a chemical
change in which 2 or more substances react to form a single new
substance
Decomposition reaction - CORRECT ANSWER-a chemical change in
which a single compound is broken down into two or more products
Combustion reaction - CORRECT ANSWER-A reaction in which a
hydrocarbon combines with oxygen to produce carbon dioxide and
water
What is a double replacement reaction - CORRECT ANSWER-A
reaction in which 2 ionic compounds exchange their ions to form a non-
ionic compound product either as a solid insoluble precipitate, gas, or
molecular compound
TESTING VERSIONS 2025 WITH
QUESTIONS AND CORRECT DETAILED
ANSWERS/FROM A VERIFIED SOURCE FOR
GUARANTEED PASS!!!
How to calculate molecular weight? - CORRECT ANSWER-add up the
individual atomic weights of each element. Don't forget to multiply an
element's atomic weight by how many atoms of that element there are.
What is a Mole and how to you solve for it? - CORRECT ANSWER-
The amount of chemical reaction of a compound. Moles= gram/
molecular weight
Percent of an element - CORRECT ANSWER-= (weight of an individual
element/ MW of the whole compound) x 100
How to solve for Empirical Formula - CORRECT ANSWER-1. Divide
each each % of an element (this is provided) by it's atomic weight
, 2. Using the results from step 1, divide each of those results by the
smallest number given from that set (round answers to nearest whole
number) ( if one of the answers ends in .25- 1/4, .333- 1/3, .5- 1/2,
.666- 2/3, .75- 3/4 multiply all of the answers by the denominator)
3. The whole numbers become the subscripts. aka the number of atoms
in the element
Combination reaction (synthesis) - CORRECT ANSWER-a chemical
change in which 2 or more substances react to form a single new
substance
Decomposition reaction - CORRECT ANSWER-a chemical change in
which a single compound is broken down into two or more products
Combustion reaction - CORRECT ANSWER-A reaction in which a
hydrocarbon combines with oxygen to produce carbon dioxide and
water
What is a double replacement reaction - CORRECT ANSWER-A
reaction in which 2 ionic compounds exchange their ions to form a non-
ionic compound product either as a solid insoluble precipitate, gas, or
molecular compound
