General Questions and Answers
Physical Chemistry
GeneralSelect the single best answer.
Give the IUPAC name for the compound.
O
2-methyl-3-propylhexane
4-isopropylheptane
O
H
CH3
CH3
-CH₂CH₂CH3
H
CH₂CH₂CH3
4-propylheptane
5-methyl-4-propylhexane
Physical Chemistry
GeneralThe following line is taken from a webpage. Identify the correct in-text citation based
on MLA formatting.
"We may be the only ones who think that braving a series of crumbling death traps is
proof of good decision making."
O(Kaufmann and Spooner)
O Kaufmann, Spooner
O (Kaufmann; Spooner)
Physical Chemistry
GeneralThe following quote is used in a source text. Now, you want to restate the quoted text
in your writing. Choose the correct in-text citation for the given quote according to the
MLA formatting style. "A writer is someone for whom writing is more difficult than it is
for other people."
O(qtd. in mann, 22)
O(qtd. in mann: 22)
(qtd. in mann 22)
Physical Chemistry
GeneralThe light emitted from a laser has a wavelength of 308 nm. What is the frequency of this light
expressed in megahertz (MHz)?
Physical Chemistry
GeneralThe frequencies of radio stations are given in MHz. For example, 91.3 FM has a frequency of 91.3
MHz. What is the wavelength of this frequency in meters? Hint, change MHz (megahertz) to Hz
first.
Physical Chemistry
GeneralIf 0.790 g of glucose are burned in a bomb calorimeter, the temperature of the 600. g of water in the calorimeter increases
J
from 15.40 °C to 19.50 °C. If the heat capacity of the calorimeter is 470.-
what is the value of q for the combustion of
C'
the glucose sample?
• Use Cwater = 4.184
J
g C
• Report your answer using three significant figures.
Provide your answer below:
kJ
Physical Chemistry
GeneralIf the light emitted has a wavelength of 655 nm, then what is the frequency of this light expressed
in hertz (Hz)?
c = 3.00 x 108 m/s and c = Av
Give answer as number x 10exponent (first blank is value to 3 SF, second blank is exponent, use
proper scientific notation)
x 10
Physical Chemistry
GeneralA chemist prepares a solution of silver perchlorate (AgCIO) by measuring out 1.2 kg of silver perchlorate into a 350. mL volumetric flask and filling the flask
to the mark with water.
Calculate the concentration in mol/L of the chemist's silver perchlorate solution. Round your answer to 2 significant digits.
Physical Chemistry
GeneralJ
What is the heat capacity of an aluminum cup that weighs 13.80 g? The specific heat of aluminum is 0.897-
three significant figures.
g °C
-. Round to
Physical Chemistry
General[References]
You mix 125 mL of 0.280 M CSOH with 50.0 mL of 0.700 M HF in a coffee-cup calorimeter, and the temperature of both solutions rises from 21.70 °C
before mixing to 24.94 °C after the reaction.
CsOH(aq) + HF (aq) → CsF(aq) + H₂O(l)
What is the enthalpy of reaction per mole of CsOH? Assume the densities of the solutions are all 1.00 g/mL, and the specific heat capacities of the
solutions are 4.2 J/g. K.
Enthalpy of reaction =
kJ/mol
Physical Chemistry
GeneralChoose the sentence that is capitalized correctly.
Eden is going to study Social Studies, Science, Spanish, and Math this week.
Eden is going to study Social Studies, science, Spanish, and math this week.
Eden is going to study social studies, science, Spanish, and math this week.
Physical Chemistry
GeneralWhat is the chemical formula for the compound formed between iron(III) and the iodate ion?
chemical formula:
B
chemical formula:
U
X₂
25
What is the chemical formula for the compound formed between iron(III) and the borate ion?
Physical Chemistry
GeneralA flame is used to heat a piece of nickel. Calculate the temperature change if 39 g of nickel absorbs 556 J of energy. The
specific heat of nickel is 0.44-
J
g °C
Select the correct answer below:
7.7°C
32°C
49°C
14°C
Physical Chemistry
GeneralThere are 5 areas of chemistry: physical chemistry,
organic chemistry analytical chemistry, biochemistry and
inorganic chemistry
Identify which of the five areas of chemistry best fits the
action done by Louis, a chemist.
Louis is investigating a new way to isolate nickel from
various nickel-containing rocks and sediment.
Answer:
chemistry
Physical Chemistry
General5. If 30.0 mL of 0.500 M KOH are needed to neutralize 10.0 mL of HC1 of unknown
concentration. Show your work.
HCl + KOH → KC1 +H₂O
a) Calculate how many moles of KOH were used
b) How many moles of HC1 were in a sample?
c) What is molarity of the HC1?
Physical Chemistry
GeneralIf 4.700 moles of water react completely, according to the following equation, what is the total change in enthalpy?
6CO₂ + 6H₂O C6H₁2O6 +60₂
AHrxn
= 2,803 kJ
• Report your answer using four significant figures.
Physical Chemistry
GeneralChoose the sentence that is free from agreement error.
When Peter stopped to take few pictures with his camera, a flock of geese were
honking by the fields.
Either the doctor or the nurses refuses to treat the accident cases at the clinic.
O To participate in the local marathon, Philip and Ivan run three miles every day.
Physical Chemistry
GeneralA system absorbs heat from the surroundings and does work on the surroundings. What are the signs of system and
Wsystem?
Select the correct answer below:
O 9system <0 and Wsystem > 0
O 9system > 0 and Wsystem >0
O9system > 0 and Wsystem < 0
O 9system <0 and Wsystem < 0
BE315 FEEDBACK
Physical Chemistry
GeneralIdentify the subject and the verb in the following sentence.
Sheila practices being a soccer goalie after school every day and on weekends so that
she can be an asset to her team.
O Every day after school
Being a soccer goalie
O Sheila practices
Physical Chemistry
GeneralWrite the balanced net ionic equation for the precipitation of chromium(III) phosphate from aqueous solution:
Physical Chemistry
GeneralPROBLEM 1
2.5 M KCI
M^^^^^^
5.0 osmol
PROBLEM 3
2.3 M CaS
wwwwwwww
4.6 osmol
ATE THE OSMOLARITY
PROBLEM 2
4.5 M C6H12O6
4.5 osmol
PROBLEM 4
1.5 M Be3(PO4)2
7.5 osmol
Physical Chemistry
GeneralIf 4.500 moles of water react completely, according to the following equation, what is the total change in enthalpy?
6CO₂ + 6H₂O →→C6H12O6 +60₂
AHrxn
= 2,803 kJ
• Report your answer using four significant figures.
Physical Chemistry
GeneralAn object with a heat capacity of 445 J/C experiences a temperature change from 76°C to 43°C. How much heat is released in this process?
• Do not include a negative sign in your response.
• Report your answer using two significant figures.
Physical Chemistry
GeneralWhat is the sum of the coefficients when the following equation is balanced with the simplest whole numbers? if a substance has an
understood 1 as the coefficient, do not forget to add it in.
Fe2O3 (s) + C (s)→ Fe (s) + CO₂ (9)
Physical Chemistry
GeneralHow much heat is produced by the combustion of 123 g of propane (C3 Hg)?
C3H8 (g) +50₂ (g) -
Select the correct answer below:
O 2.73 x 105 kJ
O 796 kJ
O 1.24 x 104 kJ
O 6.19 × 10³ kJ
3CO2(g) + 4H₂O(1)
AH' = -2220.
kJ
mol
Physical Chemistry
GeneralWhich statements about physical properties of matter are true?.
Some Mysical properties are size-dependent.
All physical properties are size-independent.
Some physical properties can be observed, and others can be measured.
Physical properties are always measurable.
Physical Chemistry
GeneralWhat is the standard enthalpy of formation (at 1 atm and 25°C) for O₂ (g)?
Select the correct answer below:
O 0 kJ/mol
O 25 kJ/mol
O 100 kJ/mol
-50 kJ/mol
H
Physical Chemistry
GeneralWhich of the following should be considered to check the authority of a book?
The aspects covered by the book.
If the author is a subject-matter expert and the publication.
The audience of the book.
Physical Chemistry
GeneralWhen heated, KCIO, decomposes into KCI and O₂.
2 KCIO,
2 KCl +30₂
If this reaction produced 70.9 g KCl, how many grams of O, were produced?
Physical Chemistry
GeneralMagnesium (Mg) combusts in air to give a brilliant white light that has been used in photographic flashes and emergency
flares. How much heat is produced if 10.0 g Mg is combusted with excess oxygen gas?
Mg(s) + O₂(g) → MgO(s) AH = -601.6 kJ/mol
• Report your answer with three significant figures.
Physical Chemistry
GeneralWrite the net ionic equation for the complete molecular equation shown below:
3 Cu(NO3)2 (aq) + 2 (NH4)3PO4 (aq) -> Cu3(PO4)2 (s) + 6 NH4NO3(aq)
Write positive reactant ion in first blank and negative reactant ion in second blank; and don't forget to include the number of each ion as well as the chemical ion symbol and charge!
Symbol of positive spectator ion is
Symbol of negative spectator ion is
Physical Chemistry
GeneralMatter can be classified first into substances and Substances can be
classified into elements and can be classified as or homogeneous.
Physical Chemistry
GeneralConsider the following unbalanced equation for the combustion of butane.
C₂H₁0 (9) + O₂(g) → CO₂ (g) + H₂O(g)
Balance the equation.
Express your answer as a chemical equation. Identify all of the phases in your answer...
Determine how many moles of O₂ are required to react completely with 5.0 mol of C4H10
Physical Chemistry
GeneralFor the reaction shown, calculate how many grams of each product form when the following amounts of reactant completely react to form products. Assume
that there is more than enough of the other reactant.
2 Al (s)+Fe₂O3 (s) → Al2O3 (s) + 2 Fe (1)
Express your answer using two significant figures.
Express your answer using two significant figures.
Physical Chemistry
GeneralGiven the following equations, determine the standard enthalpy of formation (ΔH) for BrF3(g).
Br₂(g) + 3 F₂ (g) → 2 BrF3(g) ΔH298 = -552 kcal
Br₂(1)→ Br₂(g) ΔH298 = 8 kcal
Select the correct answer below:
-272 kcal
-536 kcal
-544 kcal
-276 kcal
Physical Chemistry
GeneralA flame is used to heat a piece of iron. Calculate the temperature change if 34 g of iron absorbs 599 J of energy. The specific heat of iron is 0.45 J / g C
Select the correct answer below:
18°C
7.9°C
87°C
39°C
Physical Chemistry
GeneralWhat is the function of a subordinating conjunction?
It joins a dependent clause to a main clause.
It shows the logical relationship between the main clause and the dependent clause.
It introduces a subordinate clause.
All of the choices
Physical Chemistry
GeneralCounting cells: You have 8 ml of a cell suspension. You mix together 0.25 ml of 0.4% (w/v) Trypan Blue with 0.25 ml of HBSS buffer and 0.25 ml of your cell suspension. When you count this in a haemocytometer your average count per square (of a volume of 0.1 μl each) is 25 cells.
How many cells per ml do you have in the original suspension?
a. 500000
b. 250000
c. 6000000
d. 1000000
e. 750000
Physical Chemistry
GeneralWhat is the use of "comparative advantage" organization?
To disprove or rebut an opposing claim.
To motivate listeners to adopt a course of action.
To demonstrate the superiority of one viewpoint or proposal over another.
Physical Chemistry
GeneralUse the interactive to view the molecule from different angles.
Identify the molecular geometry around the central atom of formaldehyde, CH₂O.
linear
tetrahedral
bent
trigonal planar
trigonal pyramidal
What are the approximate bond angles in formaldehyde?
109.5°
120°
90°
180°
Physical Chemistry
GeneralChoose the correct answer.
While a speaker needs an audience to address, listeners need someone to whom they
will listen. Together, this is called a
feedback loop
performance loop
feedback
Physical Chemistry
GeneralFor the reaction, calculate how many grams of the product form when 3.4 g of Cl₂ completely reacts.
Assume that there is more than enough of the other reactant.
2 Na (s) + Cl₂ (g) → 2 NaCl (s)
Express your answer using two significant figures.
mNaCl =
For the reaction, calculate how many grams of the product form when 3.4 g of CaO completely reacts.
Assume that there is more than enough of the other reactant.
CaO (s) + CO₂(g) → CaCO3 (s)
Express your answer using two significant figures.
Physical Chemistry
GeneralThe elements in the periodic table are grouped by similar chemical properties, which come from the similarities in the arrangement of their electrons. These electron arrangements can be expressed as generic outer electron configurations, i.e., the electron configuration outside the noble gas core, for all periods in a group using n instead of a specific number. Similarly, the generic Lewis dot structures for each group can be drawn using X to represent a generic element symbol. Match each generic electron arrangement to the appropriate periodic group number. Note that not all of the electron arrangements must be used.
Physical Chemistry
GeneralThe experiment calls for preparing one of two salts, either copper(ii) sulfate or potassium aluminum sulfate. The instructions for the copper(ii) sulfate preparation give a target of between 0.025 and 0.050 moles of the copper(ii) sulfate product. The instructions also specify to use an excess of sulfuric acid but not more than 5 times the amount required by the balanced equation. Sulfuric acid will be available as a 6.0 M H₂SO4 solution. What is the volume of 6.0 M H₂SO4 required by the balanced equation to react with the CuO to produce 0.025 moles of copper(ii) sulfate. Report the volume needed BEFORE allowing for excess in milliliters to two significant figures. Don not include units in the answer box. CuO(s) + H₂SO4(aq)-> CuSO4(aq) + H₂O(1)
Physical Chemistry
GeneralIce floats on water. For most other substances, however, the solid sinks in the liquid. Classify each of these statements based on whether they describe water or most other substances. Water The solid is more dense than the liquid. The molecules are closest in the liquid phase. Answer Bank The solid is less dense than the liquid. In a phase diagram, the solid-liquid coexistence line has a negative slope. Most other substances High pressure will cause the solid to become liquid. In a phase diagram, the solid-liquid coexistence line has a positive slope. High pressure will cause the liquid to become solid. The molecules are closest in the solid phase.
Physical Chemistry
GeneralCalculate the mass in grams of Ag2S (silver sulfide) that can be produced with 54 grams of Ag (silver) based on the following equation: (2 point) 2Ag(s) + H₂S (aq) Ag2S(s) + H2(g) Show your calculations
Physical Chemistry
GeneralOg is the noble gas after Rn. To go from [Rn] to [Og], you must fill four subshells (s, p, d, and f) with a total of 32 electrons. Thus, the atomic numbers of sixth and seventh period elements of the same group differ by 32. To go from [Og] to the next noble gas, however, you would theoretically fill five subshells (s, p, d, f, and g). How many electrons are needed to fill all five subshells? number of electrons: Element 104 in the periodic table is Rf. Determine the atomic number of the element just below Rf in the periodic table. atomic number:
Physical Chemistry
GeneralCalculate the mass in grams of Fe2S3 (iron III sulfide) that can be produced with 432 grams of S (sulfur) based on the following equation: (2 point) 2Fe(s) + 3S (s) → Fe2S3(s)
Physical Chemistry
GeneralWhat is the law of energy conservation?
Select the correct answer below:
Energy is neither created nor destroyed, but it may change forms.
The entropy of the universe is constantly increasing.
The entropy of a pure substance at absolute zero is defined as zero.
Temperature is a measure of heat.
Physical Chemistry
GeneralMercury is used as a liquid in thermometers. A volume of five cubic centimeters (5 cm) of mercury has a mass of 68 grams (68 gm). What is the density of mercury in gm/cm³? (Use the formula, D = M/V)