CHEM 120 Midterm Exam Review
Course Number: CHEM120
Course Title: Introduction to General, Organic & Biological Chemistry with Lab
Well Explained Answers
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, CHEM 120 – Midterm Review
1.) CONVERSIONS IN METRIC UNITS
How many kilograms are in 143 grams?
Using KHDBDCM
Starting with Grams (g) – base unit. Moving to kilograms (kg); move the decimal three spaces to
the right
143 g – 0.143 g
Using conversion factors
KNOW that kilo = 1000 base
143 g x (1 kg/1000g ) = 0.143 kg
2.) CONVERSIONS WITH ENGLISH UNITS
How many milliliters are in 13.5 oz?
MUST USE CONVERSION FACTORS (oz, lb, feet, inches…)
Always start with what you know…. Figure out where to go
13.5 oz ? mL
13.5 oz 1 cup 1 pt 1 qt 1L 1000 mL
8 oz 2 cups 2 pt 1.06 qt 1L
= 398 mL are in 13.5 oz
Question: is ATM (atmospheres) a standard number?
Answer; No, it’s a unit. There’s not a particular number there. The gas constant has a number
and a unit because it is a constant; atmospheres will differ depending on the problem
Stoichiometry: Practice questions.
22.0 g of propane will combine with what mass (g) of O2?
C3H8 + 5O2 3CO2 + 4H2O
c- 3 c -3
H–8 H-8
O- 10 O – 6 + 4 = 10
GIVEN: want:
22.0 g of C3H8 ? g O2
Balanced chem equation
C3H8 + 5O2 3CO2 + 4H2O
Periodic table (moles to grams or grams to moles ONE COMPOUND)
Course Number: CHEM120
Course Title: Introduction to General, Organic & Biological Chemistry with Lab
Well Explained Answers
Secure high grade
Best feedback (rated) document by students
, CHEM 120 – Midterm Review
1.) CONVERSIONS IN METRIC UNITS
How many kilograms are in 143 grams?
Using KHDBDCM
Starting with Grams (g) – base unit. Moving to kilograms (kg); move the decimal three spaces to
the right
143 g – 0.143 g
Using conversion factors
KNOW that kilo = 1000 base
143 g x (1 kg/1000g ) = 0.143 kg
2.) CONVERSIONS WITH ENGLISH UNITS
How many milliliters are in 13.5 oz?
MUST USE CONVERSION FACTORS (oz, lb, feet, inches…)
Always start with what you know…. Figure out where to go
13.5 oz ? mL
13.5 oz 1 cup 1 pt 1 qt 1L 1000 mL
8 oz 2 cups 2 pt 1.06 qt 1L
= 398 mL are in 13.5 oz
Question: is ATM (atmospheres) a standard number?
Answer; No, it’s a unit. There’s not a particular number there. The gas constant has a number
and a unit because it is a constant; atmospheres will differ depending on the problem
Stoichiometry: Practice questions.
22.0 g of propane will combine with what mass (g) of O2?
C3H8 + 5O2 3CO2 + 4H2O
c- 3 c -3
H–8 H-8
O- 10 O – 6 + 4 = 10
GIVEN: want:
22.0 g of C3H8 ? g O2
Balanced chem equation
C3H8 + 5O2 3CO2 + 4H2O
Periodic table (moles to grams or grams to moles ONE COMPOUND)
