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CHEM 101 MIDTERM IVY TECH
QUESTIONS WITH COMPL ETE
SOLUTIONS
Question 1: The definition of a scientific law is
CORRECT ANSWER: a number of similar observations
generalized into a brief statement summarizing past observations and predicting new ones
Question 2: Which statement about a hypothesis is TRUE
CORRECT ANSWER: All of the above statements are
true.
Question 3: Which of the following is an example of a
scientific law
CORRECT ANSWER: In a chemical reaction, matter is
neither created nor destroyed.
Question 4: A sample of wood with a mass of 3.0 grams
was burned in an open dish. The ashes weighed 1.2 grams. What happened to the rest of the wood?
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CORRECT ANSWER: The remaining 1.8 grams was
converted into gaseous compounds.
Question 5: Which statement would NOT be an example
of "quantification"
CORRECT ANSWER: The water in the swimming pool
feels colder than it was yesterday.
Question 6: A popular science demonstration is to take
several liquids that will not mix together and "stack" these liquids in a tall glass cylinder. Suppose the following three liquids were places in the same tall, narrow glass
cylinder:
SUBSTANCE DENSITY (g/mL) vinegar 1.01 motor oil 0.87 corn syrup 1.36 These liquids would stack in which order?
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CORRECT ANSWER: motor oil on top, vinegar in the
middle, corn syrup on the bottom
Question 7: Suppose a boat engine leaks 938 mL of oil
into a lake. The mass of this spilled oil is 823 g. The oil will not mix with the lake water. Which statement is true?
CORRECT ANSWER: The oil will float because its
density of 0.877 g/mL is less than the density of water.
Question 8: Determine the answer to the following
equation with correct number of significant figures:
2.02+8.102-0.0297=
CORRECT ANSWER: 10.09
Question 9: How many milliliters are in 17.5 L
CORRECT ANSWER: 1.75 x 104 mL
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Question 10: Given the density of Au is 19.3 g/cm3,
determine the mass of gold (in grams) in an ingot with the dimensions of 10.0 in x 4.00 in x 3.00 in.
CORRECT ANSWER: 3.80 x 104
Question 11: The correct decimal representation of 6.453
x 103 is:
CORRECT ANSWER: 6,453
Question 12: A plastic block has dimensions of 2.2 cm x
3.0 cm x 1.5 cm and a mass of 12.4 grams. Will the block float in water and why
CORRECT ANSWER: No, because the density of the
block is 1.3 g/mL which is greater than the density of water.