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Chem 121 Midterm Exam with complete solutions 2024_2025

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Chem 121 Midterm Exam with complete solutions 2024_2025

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Chemistry 121
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Uploaded on
October 5, 2024
Number of pages
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Written in
2024/2025
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Chem 121 Midterm Exam with complete
solutions 2024/2025




What's the difference between a physical change and a chemical change? -
ANSWER-A physical change is only changing the state of the substance, whereas
a chemical change will alter the substance completely.


Ex: physical = water to ice
chemical = iron to rust


Name the SI base units: - ANSWER-Length = meter
Mass = kilograms
Time = seconds
Temperature = Kelvin


Name the SI prefixes: - ANSWER-Mono - 1
Di - 2
Tri - 3
Tetra - 4
Penta - 5
Hexa - 6
Hepta - 7
Octa - 8

, Nona - 9
Deca - 10


What's the difference between precision and accuracy? - ANSWER-Precision =
the closeness of a set of values obtained


Accuracy = the closeness of a measurement to its true value


Describe significant figures - ANSWER-


What is the factor label method? - ANSWER-


How do you use the factor label method? - ANSWER-


(historical and modern theories of atomic structure, i.e. Plum Pudding Model) -
ANSWER-


Given a specific isotope, explain how to find the following:
- # of protons
- # of neutrons
- # of electrons
- mass number
- approximate mass of isotope - ANSWER-


What is percent abundance? - ANSWER-Atomic mass = (abundance of 1st
isotope) (x) + (abundance of 2nd isotope) (1-x)


How do you convert between the average atomic mass of an element and the
percent abundance of its isotopes? - ANSWER-


Name the key regions of the periodic table, and some general properties. -
ANSWER-metals, nonmetals and metaloids

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