CHEM 101L: Lab 2: Conversion Factors and Problem Solving (latest
update 2024/2025) -Questions with Correct Answers/ Verified
What are the rules of rounding off numbers? - ✔✔- If the first digit to be dropped is less
than 5, it and all following digits are dropped are dropped.
- If the first digit to be dropped is 5 or greater, all the following digits are dropped and the
value of the last retained digit is increased by 1.
Rounding with Magnitude - ✔✔When you round a large number, the correct magnitude is
retained by replacing the dropped digits with placeholder zeros.
- Ex: 3.8765 x 10^4 s >>> 3.88 x 10^4 s
Significant Figures: Multiplication/Division - ✔✔The final answer is written so that it has the
same number of significant figures as the measurement with the fewest significant figures
(SFs).
Ex: 0.024 x 4.620/ 3.44 = 0.033575581 >> 0.034
Significant Figures: Addition/Subtraction - ✔✔The final answer is written so that it has the
same number of decimal places as the measurement having the fewest decimal places.
Ex: 2.11 + 104.056 + 0.1205 = 106.2865 >> 106.29
What is an equality? - ✔✔If a quantity is expressed in two different metric units, a metric
equality can be stated.
Ex: 1 m = 1000 mm
What is a conversion factor? - ✔✔The ratio of the two values. It have a numerator and a
denominator.
Ex: 1 m = 1000 mm ; 1000 m = 1 m
Area of Rectangle (cm^3) - ✔✔Area = Length x Width
Volume of Rectangular Solid - ✔✔V = Length x Width x Height
update 2024/2025) -Questions with Correct Answers/ Verified
What are the rules of rounding off numbers? - ✔✔- If the first digit to be dropped is less
than 5, it and all following digits are dropped are dropped.
- If the first digit to be dropped is 5 or greater, all the following digits are dropped and the
value of the last retained digit is increased by 1.
Rounding with Magnitude - ✔✔When you round a large number, the correct magnitude is
retained by replacing the dropped digits with placeholder zeros.
- Ex: 3.8765 x 10^4 s >>> 3.88 x 10^4 s
Significant Figures: Multiplication/Division - ✔✔The final answer is written so that it has the
same number of significant figures as the measurement with the fewest significant figures
(SFs).
Ex: 0.024 x 4.620/ 3.44 = 0.033575581 >> 0.034
Significant Figures: Addition/Subtraction - ✔✔The final answer is written so that it has the
same number of decimal places as the measurement having the fewest decimal places.
Ex: 2.11 + 104.056 + 0.1205 = 106.2865 >> 106.29
What is an equality? - ✔✔If a quantity is expressed in two different metric units, a metric
equality can be stated.
Ex: 1 m = 1000 mm
What is a conversion factor? - ✔✔The ratio of the two values. It have a numerator and a
denominator.
Ex: 1 m = 1000 mm ; 1000 m = 1 m
Area of Rectangle (cm^3) - ✔✔Area = Length x Width
Volume of Rectangular Solid - ✔✔V = Length x Width x Height
