Module 1 Exam Quiz
Module 1 Exam
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Complete the two problems below:
1. Convert 845.3 to exponential form and explain your answer.
2. Convert 3.21 x 10-5 to ordinary form and explain your answer.
Correct Answer
1.Convert 845.3 = larger than 1 = positive exponent, move decimal 2 places = 8.453 x 102
2.Convert 3.21 x 10-5 = negative exponent = smaller than 1, move decimal 5 places = 0.0000321
Using the following information, do the conversions shown below, showing all work:
1 ft = 12 inches 1 pound = 16 oz 1 gallon = 4 quarts
1 mile = 5280 feet 1 ton = 2000 pounds 1 quart = 2 pints
kilo (= 1000) milli (= 1/1000) centi (= 1/100) deci (= 1/10)
1. 2.73 liters = ? ml
2. 8.6 pts = ? qts
Correct Answer
1.
2.
Do the conversions shown below, showing all work:
1. 28oC = ? oK
2. 158oF = ? oC
3. 343oK = ? oF
Correct Answer
1. 28oC + 273 = 301 oK oC → oK (make larger) +273
2. 158oF - 32 ÷ 1.8 = 70 oC oF → oC (make smaller) -32 ÷1.8
3. 343oK - 273 = 70 oC x 1.8 + 32 = 158 oF oK → oC → oF
Be sure to show the correct number of significant figures in each calculation.
1. Show the calculation of the density of benzene if 28.6 g occupies 32.7 ml.
2. Show the calculation of the volume of 14.3 grams of acetone with density of 0.785 g/ml
Correct Answer
1. D = M / V = 28.6 / 32.7 = 0.875
2. V = M / D = 14.3 / 0.785 = 18.2 ml
1. 13.010 contains ? significant figures.
2. 0.041 contains ? significant figures.
3. 13.010 - 0.041 = ? (give answer to correct number of significant figures)
Correct Answer
1. 13.010 contains 5 significant figures.
2. 0.041 contains 2 significant figures.
3. 13.010 - 0.041 = 12.969 = 12.969 (to the thousandths place for either number)
Classify each of the following as an element, compound, solution or heterogeneous mixture and explain your answer.
1. Honey
2. Hydrogen iodide
3. Tea
Correct Answer
1. Honey - is not on periodic table (not element) - no element names (not compound)
appears to be one substance = Solution
2. Hydrogen iodide - is not on periodic table (not element) - has two element names = Compound
3. Tea - is not on periodic table (not element) - no element names (not compound)
appears to be one substance = Solution
Classify each of the following as a chemical change or a physical change
1. Clumping of milk upon adding vinegar
2. Ice melts
3. Moisture condenses on cool glass of beverage
Correct Answer
1. Vinegar clumps milk - clumping is new substance being formed = chemical change
2. Ice melts - ice (solid water) forms liquid water = physical change
3. Moisture condenses on cool glass of beverage - condenses = physical change
Show the full Nuclear symbol including any + or - charge (n), the atomic number (y), the mass number (x) and the correct element symbol (Z) for each element for which the protons, neutrons and electrons are shown - symbol should appear as follows: xZy+/- n
12 protons, 12 neutrons, 10 electrons
Correct Answer
Atomic number=#protons=12
Mass number=12+12=24
Charge=+12+(-10)=12-10=+2
Element=Mg
Element symbol:
Name each of the following chemical compounds. Be sure to name all acids as acids (NOT for instance as binary compounds)
1. H2SO3
2. Ca(NO3)2
3. FeI2
Correct Answer
1. H2SO3 - nonbinary acid = sulfurous acid
2. Ca(NO3)2 - nonbinary ionic = calcium nitrate
3. FeI2 - binary ionic = iron (II) iodide
Write the formula for each of the following chemical compounds explaining the answer with appropriate charges and/or prefixes and/or suffixes.
1. Titanium (IV) hydroxide
2. Hydrobromic acid
3. Dichlorine heptoxide
Correct Answer
1. Titanium (IV) hydroxide - Ti+4, OH-1 = Ti(OH)4
2. Hydrobromic acid - hydro = binary acid of H + Br-1 = HBr
3. Dichlorine heptoxide - ide = binary, two Cl, 7 O = Cl2O7
