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- 1. Multiple Choice
What is the mass of one mole of aluminum chloride?
62.435g
116.399g
133.341g
97.888g
- 2. Multiple Choice
What is the mass in grams of 5.90 mol C8H18?
114 g
13 g
673 g
5.90 g
- 3. Multiple ChoiceWhich pair has the same empirical formula?NaCrO4 and Na2Cr2O7C2H4O2 and C6H12O6C3H6O3 and C2H6O2CH4 and C2H6
- 4. Multiple ChoiceWhat is the percent by mass of sodium in NaCl?39%61%35%65%
- 5. Multiple ChoiceWhat is the percent by mass of oxygen in MgO?20%40%50%60%
- 6. Multiple ChoiceWhat electron configuration matches an oxygen atom?1s22s22p63s2, 3p64s23d104p51s22s22p41s22s22p61s22s22p63s23p64s23d1
- 7. Multiple Choice
What is the electron configuration of Iodine?
[Kr]5s24d105p6
[Kr]5s24d106p6
[Kr]5s25d106p6
None of the above
- 8. Multiple ChoiceHow many atomic orbitals are there in the p sublevel?2345
- 9. Multiple Choice
Systematic errors lead to a lack of:
accuracy in the measurement.
significant digits in the measurement.
precision in the measurement.
gradation of the measuring instrument
- 10. Multiple Choice
Random errors lead to a lack of:
accuracy in the measurement.
significant digits in the measurement.
precision in the measurement.
gradation of the measuring instrument
- 11. Multiple Choice
Which of the following is NOT an example of random error?
Measuring wind velocity depends on the height and time at which a measurement is taken. Multiple readings must be taken and averaged because gusts and changes in direction affect the value.
Readings must be estimated when they fall between marks on a scale or when the thickness of a measurement marking is taken into account.
When taking a volume reading in a flask, you may read the value from a different angle each time.
Measuring length with a metal ruler will give a different result at a cold temperature than at a hot temperature, due to thermal expansion of the material.
- 12. Multiple Choice
Which of the following is NOT an example of systematic error?
Forgetting to tare or zero or calibrate a balance that produces mass measurements that are always "off" by the same amount.
Not reading the meniscus at eye level for a volume measurement. The value will be consistently low or high, depending on whether the reading is taken from above or below the mark.
An improperly calibrated thermometer may give accurate readings within a certain temperature range, but become inaccurate at higher or lower temperatures.
When weighing yourself on a scale, you position yourself slightly differently each time.
- 13. Multiple Choice
A 0.025L solution of HCl is neutralized by 0.018L of a 1.0 M NaOH solution. What is the concentration of the HCl solution?
Use the steps in your notes to help you set up this problem!
1.44 M
4 M
0.72 M
None of the above
- 14. Multiple ChoiceUsing the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?4 moles Fe6 moles Fe9 moles Fe2 moles Fe - 15. Multiple ChoiceTheoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.1.16%116%85%76% - 16. Multiple Choice
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
0.85 g
290 g
450 g
870 g
- 17. Multiple ChoiceWhat is the molarity of a 30 mL HCl which is neutralized by 48 mL of 0.1 M NaOH?0.16 M6.25 M0.063 M
- 18. Multiple Choice
How do you calculate Enthalpy of a reaction?
ΔH = ΔHproducts - ΔHreactants
ΔT = q / mC
ΔG = ΔH -TΔS
E = mc2
- 19. Multiple ChoiceThe enthalpy change for the reaction
C(s, graphite) + 1⁄2O2(g) --> CO(g) cannot be measured directly since some carbon dioxide is always formed in the reaction.
It can be calculated using Hess’s Law and the enthalpy changes of combustion of graphite and of carbon monoxide.
C(s, graphite) + O2(g) --> CO2 ΔH=-394 kJmol–1
CO(g) + 1⁄2O2(g) --> CO2 ΔH=-283 kJmol–1
The enthalpy change for the reaction of graphite with oxygen to give carbon monoxide is-677 kJmol–1+111 kJmol–1-111 kJmol–1+677 kJmol–1 - Answer choicesTagsAnswer choicesTags