Equations:
oK = oC + 273.15
oF = 1.8 (oC) + 32
Conversions:
1 in = 2.54 cm
1 lb = 16 oz = 453.6 g
1 lb = 16 oz
1 mL = 1 cm3
1 mol = 6.022 x 1023
The space below is designated for scratching purpose.
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Chemistry Equations and Conversions for Exam - Prof. Zhengrong Li, Exams of Chemistry
Equations and conversions for a chemistry exam, including significant figure determination, unit conversions, and chemical reactions. It includes multiple-choice questions and comprehensive problems.
Typology: Exams
2009/2010
1 / 5
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Equations: o (^) K = o (^) C + 273.
o (^) F = 1.8 ( o (^) C) + 32
Conversions:
1 in = 2.54 cm 1 lb = 16 oz = 453.6 g
1 lb = 16 oz 1 mL = 1 cm^3
1 mol = 6.022 x 10 23
The space below is designated for scratching purpose.
Exam 1(Form B )
Name ______________________________ W# _______________________________ (Print your name)
Multiple-choice questions (5 points/question, 60 points total) Circle the one alternative that best completes the statement or answers the question.
Determine the number of significant figures of the answer to the following equation: (2.73 + 0.2) ÷ 23. A) 1 B) 2 C) 3 D) 4 E) 5
According to the definition, there are 1000 grams in 1 kilogram. When using this conversion factor, how many significant figures are you limited to? A) 1 B) 4 C) ambiguous D) depends on if you are using it in multiplication/division or addition/subtraction E) infinite number of significant figures
How many kilometers are in one millimeter? A) 10 2 B) 10 3 C) 10 6 D) 10 - E) 10 -
Which of these is the correct SI unit for volume? A) cm^3 B) mL C) m^3 D) in 3 E) L
Typically, _________ elements __________ electrons in chemical reactions, and become __________. A) nonmetal, gain, anions B) metal, gain, anions C) nonmetal, lose, anions D) nometal, gain, cations E) metal, lose, anions
Identify the element and calculate numbers of neutrons, and electrons in
60 3 + 27 X^. A) Nd, 27, 27 B) Cu, 60, 30 C) Co, 33, 30 D) Co, 33, 24 E) Fr, 87, 25
Comprehensive Problems (40 points total) (Show all work to gain credit)
(5 points) What is the sum of all coefficients after the equation of methanol combustion is balanced to the smallest whole number ratio? CH 4 O + O 2 → CO 2 + H 2 O
(5 points) Covert 233 K to o^ F. (watch significant figures)
(5 points) Convert 3.30 m^2 to in^2
Using chemical equation in Question 12, A) (10 points) if 51.1 g of ammonia is combined with 64.0 g of oxygen gas, what is the limiting reactant and how much in moles is the theoretical yield of nitrogen monoxide?
B) (10 points) how much in grams is the excess reactant left in the reaction mixture?
C) (5 points) Calculate the actual yield of nitrogen monoxide in grams if the percent yield of the reaction is 44.4 %.
Extra Credit Problems: (total 10 points)
- Image yourselves as scientists in NASA designing the emergency device of air purification for CO 2 absorption and O 2 generation in a space shuttle. A) (5 points) For a crew of 7 persons with each person generating 0.15 ounce CO 2 per minute in average, how many grams of CO 2 does the crew generate for a day?
B) (5 points) Lithium peroxide is chosen to absorb carbon dioxide and release oxygen in the reaction, 2 Li 2 O 2 (s) + 2 CO 2 (g) → 2 Li 2 CO 3 (s) + O 2 (g) In order to support the crew for at least 36 hours in the shuttle during the state of emergency, how many kilograms of Li 2 O 2 should be stored in the shuttle at least?