UNE CHEM1010 Midterm Exam NEWEST EXAM
COMPLETE 220 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+ BRAND NEW!!
1 tsp of baking soda, NaHCO3, weighs 5.0 g. How many moles of baking soda are in 1 tsp?
A) 420.05 mol
B) 0.097 mol
C) 0.012 mol
D) 0.060 mol - CORRECT ANSWER: D) 0.060 mol
2HNO3(aq) + Ca(OH)2(aq) Ca(NO3)2(aq) + H2O(l) is an example of a
A) precipitation reaction
B) combustion redox reaction
C) neutralization reaction
D) single-displacement redox reaction - CORRECT ANSWER: C) neutralization reaction
26Mg has
A) 26 protons
B) 13 protons
C) 14 neutrons
D) 26 electrons - CORRECT ANSWER: C) 14 neutrons
44Ca has
,A) 44 protons
B) 24 neutrons
C) 22 protons
D) 44 electrons - CORRECT ANSWER: B) 24 neutrons
A cation
A) is formed when an atom or molecule loses an electron, resulting in a negative charge
B) is formed when an atom or molecule gains an electron, resulting in a negative charge
C) is formed when an atom or molecule loses an electron, resulting in a positive charge
D) is formed when an atom or molecule gains an electron, resulting in a positive charge -
CORRECT ANSWER: C) is formed when an atom or molecule loses an electron, resulting in a
positive charge
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
9.70 mL, 9.69 mL, and 9.71 mL. The pipette is
A) Neither accurate or precise
B) Accurate and precise
C) Accurate, but not precise
D) Precise, but not accurate - CORRECT ANSWER: D) Precise, but not accurate
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 - CORRECT ANSWER: C) Accurate and precise
A comprehensive, testable explanation that explains a large body of experimental data is a/an
A) Hypothesis
B) Law
C) Theory
D) Model - CORRECT 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 - CORRECT ANSWER: B) Expands to completely fill a
container
A hydrocarbon sample is isolated from soil near a gas station to determine if the underground gas
storage tanks are leaking. The sample is heated in a furnace to completely convert it to carbon
dioxide and water, which can then be absorbed in chemical traps and weighed to determine the
empirical formula of the hydrocarbon. This is an example of
non-combustion gravimetric analysis
combustion analysis
dimensional analysis
titration analysis - CORRECT ANSWER: B) combustion analysis
, A hydroponic fertilizer solution contains 24.9 ppm of magnesium in water which is equivalent to
24.9 mg/L. What is the total mass of magnesium in 65 L of the fertilizer solution?
A) 1.62 kg
B) 1.62 g
C) 0.383 g
D) 2.61 kg - CORRECT ANSWER: B) 1.62 g
A hydroponic fertilizer solution contains 131.7 ppm of potassium in water, which is equivalent to
131.7 mg/L. What is the total mass of potassium in 65 L of the fertilizer solution?
A) 8.56 g
B) 8.56 kg
C) 493 g
D) 2.02 g - CORRECT ANSWER: A) 8.56 g
A proton
A) is part of an atom's nucleus and has a positive charge
B) is part of an atom's nucleus and has a negative charge
C) is part of an atom's nucleus and has no charge
D) is outside an atom's nucleus and has a negative charge - CORRECT ANSWER: A) is part of
an atom's nucleus and has a positive charge
A pure substance that cannot be broken down into simpler substances by chemical changes is
a/an
COMPLETE 220 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+ BRAND NEW!!
1 tsp of baking soda, NaHCO3, weighs 5.0 g. How many moles of baking soda are in 1 tsp?
A) 420.05 mol
B) 0.097 mol
C) 0.012 mol
D) 0.060 mol - CORRECT ANSWER: D) 0.060 mol
2HNO3(aq) + Ca(OH)2(aq) Ca(NO3)2(aq) + H2O(l) is an example of a
A) precipitation reaction
B) combustion redox reaction
C) neutralization reaction
D) single-displacement redox reaction - CORRECT ANSWER: C) neutralization reaction
26Mg has
A) 26 protons
B) 13 protons
C) 14 neutrons
D) 26 electrons - CORRECT ANSWER: C) 14 neutrons
44Ca has
,A) 44 protons
B) 24 neutrons
C) 22 protons
D) 44 electrons - CORRECT ANSWER: B) 24 neutrons
A cation
A) is formed when an atom or molecule loses an electron, resulting in a negative charge
B) is formed when an atom or molecule gains an electron, resulting in a negative charge
C) is formed when an atom or molecule loses an electron, resulting in a positive charge
D) is formed when an atom or molecule gains an electron, resulting in a positive charge -
CORRECT ANSWER: C) is formed when an atom or molecule loses an electron, resulting in a
positive charge
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
9.70 mL, 9.69 mL, and 9.71 mL. The pipette is
A) Neither accurate or precise
B) Accurate and precise
C) Accurate, but not precise
D) Precise, but not accurate - CORRECT ANSWER: D) Precise, but not accurate
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 - CORRECT ANSWER: C) Accurate and precise
A comprehensive, testable explanation that explains a large body of experimental data is a/an
A) Hypothesis
B) Law
C) Theory
D) Model - CORRECT 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 - CORRECT ANSWER: B) Expands to completely fill a
container
A hydrocarbon sample is isolated from soil near a gas station to determine if the underground gas
storage tanks are leaking. The sample is heated in a furnace to completely convert it to carbon
dioxide and water, which can then be absorbed in chemical traps and weighed to determine the
empirical formula of the hydrocarbon. This is an example of
non-combustion gravimetric analysis
combustion analysis
dimensional analysis
titration analysis - CORRECT ANSWER: B) combustion analysis
, A hydroponic fertilizer solution contains 24.9 ppm of magnesium in water which is equivalent to
24.9 mg/L. What is the total mass of magnesium in 65 L of the fertilizer solution?
A) 1.62 kg
B) 1.62 g
C) 0.383 g
D) 2.61 kg - CORRECT ANSWER: B) 1.62 g
A hydroponic fertilizer solution contains 131.7 ppm of potassium in water, which is equivalent to
131.7 mg/L. What is the total mass of potassium in 65 L of the fertilizer solution?
A) 8.56 g
B) 8.56 kg
C) 493 g
D) 2.02 g - CORRECT ANSWER: A) 8.56 g
A proton
A) is part of an atom's nucleus and has a positive charge
B) is part of an atom's nucleus and has a negative charge
C) is part of an atom's nucleus and has no charge
D) is outside an atom's nucleus and has a negative charge - CORRECT ANSWER: A) is part of
an atom's nucleus and has a positive charge
A pure substance that cannot be broken down into simpler substances by chemical changes is
a/an
