Page path
• CHEM101_MH_V4
• Topic 3: Stoichiometry
Started on Thursday, March 17, 2022, 9:21 AM
State Finished
Completed on Thursday, March 17,
... [Show More] 2022, 10:39 AM
Time taken 1 hour 18 mins
Grade 105.80 out of 115.00 (92%)
Feedback You’re off to a good start. A course grade of 70% is required to request a transcript. You’ve met that for the first exam already, but if you want to reattempt for a higher grade you can retake this assessment. Study hard for each exam, and consider using tutoring anytime you get stuck. Remember that 10 hours of tutoring are provided to you through your StraighterLine membership.
Question 1
Correct
4.60 points out of 4.60
Flag question
Question text
What is the term used for findings that are summarized based on a pattern or trend?
Select one:
a. Law
b. Hypothesis
c. Theory
d. Phenomena
e. Prediction
Question 2
Correct
4.60 points out of 4.60
Flag question
Question text
Which of the following is a tentative explanation for a set of observations?
Select one:
a. Law
b. Hypothesis
c. Theory
d. Phenomena
e. Prediction
Question 3
Correct
4.60 points out of 4.60
Flag question
Question text
Which of the following is an extensive property?
Select one:
a. Density
b. Temperature
c. Mass
d. Specific Heat
e. Pressure
Question 4
Incorrect
0.00 points out of 4.60
Flag question
Question text
Which of the following is an extensive property of oxygen?
Select one:
a. Boiling point
b. Temperature
c. Average kinetic energy of molecules
d. Density
e. Mass
Question 5
Correct
4.60 points out of 4.60
Flag question
Question text
Which of these is an example of a physical property?
Select one:
a. Corrosiveness of sulfuric acid
b. Toxicity of cyanide
c. Flammability of gasoline
d. Neutralization of stomach acid with an antacid
e. Lead becomes a liquid when heated to 601°C.
Question 6
Correct
4.60 points out of 4.60
Flag question
Question text
The density of magnesium is 1.7 g/cm3, and the density of iron is 7.9 g/cm3. Consider a block of iron with a mass of 819 g. What is the mass of a block of magnesium that has the same volume as the block of iron?
Select one:
a. 1.8 x 102 g
b. 61 g
c. 2.8 x 103 g
d. 3.8 x 103 g
e. None of the above.
Question 7
Correct
4.60 points out of 4.60
Flag question
Question text
What is the volume of a container that contains 14.3 g of a substance having a density of 0.988 g/cm3?
Select one:
a. 14.1 cm3
b. 0.0691 cm3
c. 14.5 cm3
d. 141 cm3
e. 691 cm3
Question 8
Correct
4.60 points out of 4.60
Flag question
Question text
The result of (3.8621 × 1.5630) – 5.98 is properly written as
Select one:
a. 0.06
b. 0.056
c. 0.0565
d. 0.05646
e. 0.056462
Question 9
Correct
4.60 points out of 4.60
Flag question
Question text
Atoms of the same element with different mass numbers are called
Select one:
a. ions.
b. neutrons.
c. chemical groups.
d. chemical families.
e. isotopes.
Question 10
Correct
4.60 points out of 4.60
Flag question
Question text
Which of these elements is chemically similar to oxygen?
Select one:
a. Sulfur
b. Calcium
c. Iron
d. Nickel
e. Potassium
Question 11
Correct
4.60 points out of 4.60
Flag question
Question text
Which of these elements is chemically similar to magnesium?
Select one:
a. Sulfur
b. Calcium
c. Iron
d. Nickel
e. Potassium
Question 12
Correct
4.60 points out of 4.60
Flag question
Question text
C(graphite) and C(diamond) are examples of:
Select one:
a. isotopes of carbon.
b. allotropes of carbon.
c. the law of definite proportions.
d. different carbon ions.
Question 13
Correct
4.60 points out of 4.60
Flag question
Question text
Which of the following is a type of radioactive radiation that consists of electrons and is deflected away from the negatively charged plate?
Select one:
a. α rays
b. β rays
c. γ rays
d. δ rays
e. ε rays
Question 14
Correct
4.60 points out of 4.60
Flag question
Question text
What is the name of ClO – ion?
Select one:
a. hypochlorite
b. chlorate
c. chlorite
d. perchlorate
e. perchlorite
Question 15
Correct
4.60 points out of 4.60
Flag question
Question text
What is the formula of iodous acid?
Select one:
a. HI
b. HIO3
c. HIO
d. HIO4
e. HIO2
Question 16
Correct
4.60 points out of 4.60
Flag question
Question text
What is the formula for lead(II) oxide?
Select one:
a. PbO
b. PbO2
c. Pb2O
d. PbO4
e. Pb2O3
Question 17
Correct
4.60 points out of 4.60
Flag question
Question text
Which of these compounds is most likely to be ionic?
Select one:
a. NCl3
b. BaCl2
c. CO
d. SO2
e. SF4
Question 18
Correct
4.60 points out of 4.60
Flag question
Question text
What is the percent carbon in CH3CH2OH?
Select one:
a. 13%
b. 26%
c. 35%
d. 46%
e. 52%
Question 19
Correct
4.60 points out of 4.60
Flag question
Question text
What is the mass of 0.0250 mol of P2O5?
Select one:
a. 35.5 g
b. 5676 g
c. 0.0250 g
d. 1.51 × 1022 g
e. 3.55 g
Question 20
Correct
4.60 points out of 4.60
Flag question
Question text
What is the mass of 1.63 × 1021 atoms of silicon? (NA = 6.022 × 1023 mol–1)
Select one:
a. 2.71 × 10–23 g
b. 4.58 × 1022 g
c. 28.08 g
d. 1.04 × 104 g
e. 7.60 × 10–2 g
Question 21
Incorrect
0.00 points out of 4.60
Flag question
Question text
What is the percent sulfur in iron(III) sulfate?
Select one:
a. 28%
b. 32%
c. 24%
d. 48%
e. 42%
Question 22
Correct
4.60 points out of 4.60
Flag question
Question text
Which is a representation of a balanced chemical equation for the reaction of nitrogen gas and chlorine gas to form nitrogen trichloride?
Select one:
a.
b.
c.
d.
e.
Question 23
Correct
4.60 points out of 4.60
Flag question
Question text
Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.)
___ Cr + ___ H2SO4 → ___ Cr2(SO4)3 + ___ H2
Select one:
a. 4
b. 9
c. 11
d. 13
e. 15
Question 24
Correct
4.60 points out of 4.60
Flag question
Question text
Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.)
___ Al + ___ H2SO4 → ___ Al2(SO4)3 + ___ H2
Select one:
a. 3
b. 5
c. 6
d. 9
e. 12
Question 25
Correct
4.60 points out of 4.60
Flag question
Question text
The first step in the Ostwald process for producing nitric acid is as follows:
4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g).
If the reaction of 15.0 g of ammonia with 15.0 g of oxygen gas yields 8.70 g of nitric oxide, what is the percent yield of this reaction?
Select one:
a. 29.0%
b. 32.9%
c. 49.5%
d. 61.8%
e. 77.3% [Show Less]