UNE CHEM1010 Midterm Exam Questions
With 100% Solved Solutions.
A comprehensive, testable explanation that explains a large body of experimental data is a/an
A) Hypothesis
B) Law
C) Theory
D) Model - Answer C) Theory
A gas
A) Has fixed shape and volume
B) Expands to completely fill a container
C) Takes shape of a container and forms a horizontal upper surface
D) Is rigid and has a definite shape - Answer B) Expands to completely fill a container
Two or more types of matter that can be separated by physical changes is a/an
A) Mixture
B) Compound
C) Molecule
D) Element - Answer A) Mixture
Which of the following is a chemical change?
A) Cheese being shredded
B) Snow melting
C) Toast burning
D) Salt dissolving in water - Answer C) Toast burning
,B) The number of significant figures in the answer will equal the greatest significant figures in a
number in the calculation
C) The number of decimal places in the answer will equal the fewest decimal places in a number
in the calculation
D) The number of significant figures in the answer will equal the fewest significant figures in a
number in the calculation - Answer C) The number of decimal places in the answer will equal
the fewest decimal places in a number in the calculation
A Class-A 10 mL pipette is supposed to dispense 10.00 mL of water. A lab technician makes
three measurements of the volume that the pipette actually dispenses, and obtains volumes of
10.01 mL, 9.99 mL, and 10.00 mL. The pipette is
A) Precise, but not accurate
B) Accurate, but not precise
C) Accurate and precise
D) Neither accurate or precise - Answer C) Accurate and precise
What is the answer to 136.8 + 7.897 - 0.04, reported with the correct number of significant
figures?
A) 144.6
B) 144
C) 144.66
D) 144.657 - Answer A) 144.6
What is the answer to 5.763 x 0.111 ÷ 1.2, reported to the correct number of significant figures?
A) 0.5330
B) 0.533
C) 0.53
D) 0.5 - Answer C) 0.53
How many millimeters are in 0.24 km?
, D) 2.4 x 105 mm - Answer D) 2.4 x 105 mm
The density of copper is 8.96 g/cm3. What is the volume in cm3 of 1.35 pounds of copper?
A) 68.3 cm3
B) 3.32 x 10-4 cm3
C) 5.49 x 103 cm3
D) 2.67 x 10-2 cm3 - Answer A) 68.3 cm3
A tentative explanation of observations is a/an
A)Theory
B) Law
C) Model
D) Hypothesis - Answer D) Hypothesis
A solid
A)Expands to completely fill a container
B) Takes shape of a container and forms a horizontal upper surface
C) Has fixed shape and volume
D) Flows when acted upon by gravity - Answer C) Has fixed shape and volume
A pure substance that cannot be broken down into simpler substances by chemical changes is
a/an
A) Mixture
B) Compound
C) Solution
D) Element - Answer D) Element
With 100% Solved Solutions.
A comprehensive, testable explanation that explains a large body of experimental data is a/an
A) Hypothesis
B) Law
C) Theory
D) Model - Answer C) Theory
A gas
A) Has fixed shape and volume
B) Expands to completely fill a container
C) Takes shape of a container and forms a horizontal upper surface
D) Is rigid and has a definite shape - Answer B) Expands to completely fill a container
Two or more types of matter that can be separated by physical changes is a/an
A) Mixture
B) Compound
C) Molecule
D) Element - Answer A) Mixture
Which of the following is a chemical change?
A) Cheese being shredded
B) Snow melting
C) Toast burning
D) Salt dissolving in water - Answer C) Toast burning
,B) The number of significant figures in the answer will equal the greatest significant figures in a
number in the calculation
C) The number of decimal places in the answer will equal the fewest decimal places in a number
in the calculation
D) The number of significant figures in the answer will equal the fewest significant figures in a
number in the calculation - Answer C) The number of decimal places in the answer will equal
the fewest decimal places in a number in the calculation
A Class-A 10 mL pipette is supposed to dispense 10.00 mL of water. A lab technician makes
three measurements of the volume that the pipette actually dispenses, and obtains volumes of
10.01 mL, 9.99 mL, and 10.00 mL. The pipette is
A) Precise, but not accurate
B) Accurate, but not precise
C) Accurate and precise
D) Neither accurate or precise - Answer C) Accurate and precise
What is the answer to 136.8 + 7.897 - 0.04, reported with the correct number of significant
figures?
A) 144.6
B) 144
C) 144.66
D) 144.657 - Answer A) 144.6
What is the answer to 5.763 x 0.111 ÷ 1.2, reported to the correct number of significant figures?
A) 0.5330
B) 0.533
C) 0.53
D) 0.5 - Answer C) 0.53
How many millimeters are in 0.24 km?
, D) 2.4 x 105 mm - Answer D) 2.4 x 105 mm
The density of copper is 8.96 g/cm3. What is the volume in cm3 of 1.35 pounds of copper?
A) 68.3 cm3
B) 3.32 x 10-4 cm3
C) 5.49 x 103 cm3
D) 2.67 x 10-2 cm3 - Answer A) 68.3 cm3
A tentative explanation of observations is a/an
A)Theory
B) Law
C) Model
D) Hypothesis - Answer D) Hypothesis
A solid
A)Expands to completely fill a container
B) Takes shape of a container and forms a horizontal upper surface
C) Has fixed shape and volume
D) Flows when acted upon by gravity - Answer C) Has fixed shape and volume
A pure substance that cannot be broken down into simpler substances by chemical changes is
a/an
A) Mixture
B) Compound
C) Solution
D) Element - Answer D) Element
