APHY IVYTECH Chem 101 Midterm
Exam Questions and Answers
1. The definition of a scientific law is: a number of similar observations generalized
into a brief statement summarizing past observations and predicting new ones
2. Which statement about a hypothesis is TRUE: All of the above statements are
true.
3. Which of the following is an example of a scientific law: In a chemical
reaction, matter is neither created nor destroyed.
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?: The remaining
1.8 grams was converted into gaseous compounds.
5. Which statement would NOT be an example of "quantification": The
water in the swimming pool feels colder than it was yesterday.
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,
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, 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?: motor oil on top, vinegar in the middle, corn
syrup on the bottom
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?: The oil will float because its density of 0.877 g/mL is less than the density
of water.
8. Determine the answer to the following equation with
correct number of significant figures:
2.02+8.102-0.0297=: 10.09
9. How many milliliters are in 17.5 L: 1.75 x 104 Ml
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.: 3.80 x 104
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Exam Questions and Answers
1. The definition of a scientific law is: a number of similar observations generalized
into a brief statement summarizing past observations and predicting new ones
2. Which statement about a hypothesis is TRUE: All of the above statements are
true.
3. Which of the following is an example of a scientific law: In a chemical
reaction, matter is neither created nor destroyed.
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?: The remaining
1.8 grams was converted into gaseous compounds.
5. Which statement would NOT be an example of "quantification": The
water in the swimming pool feels colder than it was yesterday.
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,
1/
9
, 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?: motor oil on top, vinegar in the middle, corn
syrup on the bottom
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?: The oil will float because its density of 0.877 g/mL is less than the density
of water.
8. Determine the answer to the following equation with
correct number of significant figures:
2.02+8.102-0.0297=: 10.09
9. How many milliliters are in 17.5 L: 1.75 x 104 Ml
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.: 3.80 x 104
2/
9
