General Questions and Answers
Physical Chemistry
GeneralWhat is the mass of 3.99 mol of nickel?.
mass:
What is the mass of 1.29 mol of platinum?
mass:
Which has a greater mass, 3.99 mol of nickel or 1.29 mol of platinum?
O 1.29 mol of platinum
O 3.99 mol of nickel
g
g
Physical Chemistry
GeneralDuring the winter months, many locations experience snow and ice storms. It is a common practice to treat roadways and
sidewalks with salt, such as CaCl,. If a 18.1 kg bag of CaCl, is used to treat the sidewalk, how many moles of CaCl, does this
bag contain?
moles=
Physical Chemistry
GeneralComplete combustion of 5.10 g of a hydrocarbon produced 16.6 g of CO₂ and 5.10 g of H₂O.
Divide the number of moles of carbon and hydrogen by the smallest of the two values. Report these ratios to three significant figures.
carbon:
hydrogen:
Physical Chemistry
GeneralA 5.27 g mixture contains both lithium fluoride, LiF, and potassium fluoride, KF. If the mixture contains 3.19 g fluorine, what is
the mass of the KF in the mixture?
mass of KF:
g
Physical Chemistry
GeneralSelect the correct statements about the chemical equation shown.
6 CO₂(g) + 6H₂O(1) ->
C6H₁2O6 (s) +60₂(g)
12
This chemical reaction produces a solid and a gas.
Solids, liquids, and gases are involved in this chemical reaction.
Only solids and gases are involved in this chemical reaction.
Both products are liquids in this chemical reaction.
In this chemical equation, (1) means liter.
Physical Chemistry
GeneralFor ALL numerical answers on this test, report the answers to the appropriate
number of significant figures AND report the appropriate units!
1. Balance the following equations.
a. H₂S + Cl₂ → S8 + HCI
b. Al + HCI → AICI3 + H₂
c. NH3 + NO -> N2 + H2O
d. C4H10+ Cl₂ + O₂ -> CO₂ + CCl4 + H₂O
e. Al + NH4CIO4 -> Al₂O3 + AICI3+ NO + H₂O
Physical Chemistry
GeneralIf two objects have different temperatures, heat will flow from the warmer object to the cooler one
UNTIL
a. one of the objects reaches absolute zero
b. one runs out of energy
c. they have reached thermal equilibrium
d. all of the above
Physical Chemistry
General>
<Mastering Chemistry Assignment: Chapter 13 Homework
Problem 13.36- Enhanced - with Feedback
Shifts equilibrium in direction of reactants
Ammonia is produced by reacting nitrogen gas and hydrogen gas is the following reaction:
For each of the following changes at equilibrium, indicate whether the equilibrium shifts in the direction of products, shifts in the direction of reactants, or does not change:
N2(g) + 3H2(g) = 2NH3(g) +92 kJ
Drag the appropriate items to their respective bins.
Submit
increase the volume of the container
add more H₂(g)
Previous Answers Request Answer
Shifts equilibrium in direction of products
add more NH3(g)
remove some N₂(g)
Equilibrium does not change
<
decrease the temperature
12 of 17
Reset Help
>
Physical Chemistry
GeneralPoints 3
Question 10
Identify the literary device/figurative language from the following lines from Hamlet
by William Shakespeare.
"Thrift, thrift, Horatio! the funeral baked meats,
Did coldly furnish forth the marriage tables"
Hyperbole
Oxymoron
Paradox
Physical Chemistry
GeneralWrite a balanced equation for the combination of zinc and iodine to form zinc iodide, ZnI₂. Phase symbols are not graded.
balanced equation:
How many moles of zinc are required to react with five moles of iodine?
moles of zinc:
Physical Chemistry
GeneralThe addition of 9.54 kJ of heat is required to raise the temperature of 225.0 g of a liquid hydrocarbon
from 20.5°C to 45.0°C. What is the heat capacity of this hydrocarbon?
a. 0.94 J/g °C
b. 1.73 J/g °C
c. 1.88 J/g C
d. 9.42 J/g°C
Physical Chemistry
GeneralWhich of the following is NOT a typical property of a metal?
a. forms ionic compounds with nonmetals
b. tendency to lose electrons to form cations
c. outer electron shells contain 4 or more electrons
d. high electrical conductivity
Physical Chemistry
GeneralA silver picture frame has a volume of 16.0 cubic centimeters and a density of 10.5 grams per cubic centimeter. Calculate its mass.
Write your answer as a whole number.
grams
Physical Chemistry
GeneralClassify the reaction below by choosing ALL applicable reaction types to the reaction below.
1. redox
II. combination
III. decomposition
IV. displacement
V. metathesis
a. only III
b. I and V
c. I and III
d. only V
2NH₂NO,(s) - 2N₂(g) + O₂(g) + 4H₂O(g)
Physical Chemistry
GeneralHydrogen gas can be produced from the reaction of calcium hydride and water:
CaH₂ (s) + 2 H₂O (l) -> 2 H₂(g) + Ca(OH)2 (aq)
How many grams of calcium hydride are needed to produce 5.34 L of hydrogen gas collected over water at 22.0 °C and a total pressure of 769.0 torr? The vapor pressure of water at 22.0 °C is 19.827 torr.
R = 0.08206 L atm/ mol K
Do NOT include units in your answer. If you round during your calculation, be sure to keep at least three (3) decimal places. Report your answer to one (1) decimal place.
Physical Chemistry
GeneralWhich set of procedures and observations
indicates a chemical change?
a. Ethanol is added to an empty beaker and the
ethanol eventually evaporates
b.
A solid is gently heated in a crucible and the
solid slowly turns to liquid
c.
Large crystals are crushed with a mortar and
pestle and become powder
d.
A cool, shiny metal is added to water in a
beaker and gas bubbles rapidly appear
Physical Chemistry
General5. Magnesium oxide can be made by heating magnesium metal in the presence of oxygen. The
unbalanced equation is: Mg(s) + O₂ → MgO(s), When 100 g of Mg is allowed to react with
200 g O2, 120 g MgO is collected. Determine the limiting reactant, theoretical yield and percent
yield for the reaction.
Physical Chemistry
GeneralBalance the equations by adding coefficients as needed. Do not add anything if the coefficient is 1.
|__C₂H₂
+
+50₂
| 3 BaCl, + | 2 KPO, —
2 Cu(NO3)2 ->>
2]Fe + 0₂
→
3 CO₂ +
2 CuO +
0₂ → Fe₂0₂
-
4 H₂O
Ba3(PO4)2 +
0₂ +
6 KC1
4 NO₂
Physical Chemistry
GeneralWhat is the general equation associated with first electron affinity?
Select the correct answer below:
OX(g) + e →→ X¹ (g)
->>
OX(g) + e- X¯(g)
OX(g) X¹ (g) + e-¯
OX(g) → X¯(g) + e
Physical Chemistry
GeneralIf 137.0 g of the mixture produces 2.08 g of H₂O, 19.68 g of CO2, and 4.39 g of O2, what was the mass of each compound in the
mixture? Assume complete decomposition of the mixture. NaBr does not react under the reaction conditions.
mass of NaBrO3:
mass of NaHCO3:
mass of Na₂CO3:
mass of NaBr:
13.8
19.32
42.4
Incorrect
40.8
60
g
60
g
9
Physical Chemistry
GeneralWe're told oxygen is the most common element in the Earth's solid crust. But how much oxygen is there? Let's compare to the amount of oxygen in the Earth's
atmosphere, like this:
• The most common minerals in the Earth's crust are feldspars, and sanidine (KAISi3Og) is a typical feldspar. Let's assume the entire crust is made of
3
sanidine, with a density of 2.5 g/cm³.
. The radius of the Earth is 6371. km and let's say the crust is the upper 50.0 km of it.
3
• Let's model the Earth's atmosphere as a layer on top of the Earth about 100. km thick with an average density of 0.99 g/m³, and which is 23.1% oxygen
by mass.
Use this information to calculate the ratio of the mass of oxygen in the Earth's atmosphere to the mass of oxygen in the Earth's crust. Round your answer to 2
significant digits.
Physical Chemistry
GeneralThe reaction of aluminum with chlorine gas is shown.
2 Al + 3Cl₂ → 2 AICI,
Based on this equation, how many molecules of chlorine gas are needed to react with 10 aluminum atoms?
number of Cl₂ molecules:
How
many units of aluminum chloride (AIC13) can be produced from 10 aluminum atoms?
number of AlCl3 units:
Physical Chemistry
GeneralClassify the following reaction and identify the limiting reagent when 15 grams of each reactant are
used.
2NaCl(aq) + Hg(NO3)₂(aq) → HgCl₂(s) + 2NaNO,(aq)
a. Metathesis, Hg(NO₂)2
b. Displacement, NaCl
c. Catalysis, Hg₂Cl₂
d. Decomposition, NaCl
Physical Chemistry
GeneralA certain dose of Tums contains 750.0 mg of calcium carbonate, CaCO3, in each tablet. In this problem, you will follow the
steps to calculate how many grams of stomach acid, HCl, are neutralized by one tablet of Tums.
Balance the chemical equation for the reaction of HCl with CaCO3.
chemical equation:
Using the balanced equation, determine how many moles of HCl will react with 1 mol of CaCO3.
moles of HC1:
Calculate how many moles 750.0 mg CaCO3 is.
750.0 mg CaCO3 =
4
mol
mol CaCO3
Physical Chemistry
GeneralThis is the chemical formula for tale (the main ingredient in talcum powder):
Mg, (Si₂O), (OH),
An analytical chemist has determined by measurements that there are 83.9 moles of oxygen in a sample of talc. How many moles of hydrogen are in the
sample?
Round your answer to 3 significant digits.
Physical Chemistry
GeneralNitric acid can be produced in the reaction shown below with a percent yield of 75%. If 45 g of NO2 are
used in a particular experiment, how many grams of nitric acid can be produced?
O 30.8 g
O 69.3 g
O 41.1 g
O 54.8 g
3 NO₂ (g) + H₂O (1) ® 2 HNO3 (aq) + NO (g)
Physical Chemistry
GeneralIf one mole of potassium reacts in this manner, how many moles of \(\ce {H_{2}}\) are produced?
moles of \(\ce{H_{2}}\text{:}\) 0.5
How many moles of potassium are required to produce \(23.0-\text{moles}\) of \(\ce{H_{2}}\text{2}\)
moles of potassium: 46
How many moles of \(\ce{KOH}\) are produced if \(3369.5-\text{moles}\) of \(\ce{H_{2}0}\) are consumed?
moles of \(\ce{KOH}\text{:}\)
mol
mol
mol
Physical Chemistry
GeneralSilicon (28 g, 1.0 mole) and oxygen (128 g, 4.0 moles) are reacted in a sealed container. At the end of the reaction, how much
silicon, oxygen, and silicon dioxide are present in the container? Complete the following table.
SiO₂
Starting Moles
Change
Ending Moles
Ending Grams
O₂ change:
Si ending moles:
O, ending moles:
Si
1.0 mol
-1.0 mol
+
0₂
4.0 mol
mol
mol
mol
-
0 mol
SiO₂ change:
Si ending grams:
O₂ ending grams:
mol
g
g
Physical Chemistry
GeneralWhich of the following are redox reactions?
O A only
O A and B
OA, B and C
O A, B, C and D
B)
C)
D)
PCl3 + Cl₂ PCI,
Cu + 2 AgNO3Cu(NO3)₂ + 2 Ag
CO₂ + 2 LiOH
Li₂CO3 + H₂O
FeCl₂ + 2 NaOH
> Fe(OH)₂ + 2 NaCl
Physical Chemistry
GeneralWhich of the following statements about strong soluble bases is FALSE?
a. They are composed of either alkali metals or some of the more reactive alkaline earth metals.
b. They are all metal hydroxides.
c. Their solutions conduct electricity.
d They are classified as weak electrolytes
Physical Chemistry
GeneralHenry is always energetic and finishes his work on time, but today he is lethargic and
could not complete the assigned task.
What does the word lethargic mean in this context?
O Sluggish
Unhappy
Enthusiastic
Physical Chemistry
GeneralA mixture of hydrocarbons contains 32.1% hexane, C6H₁4, 11.2% octane, Cg H₁8, and 56.7% decane, C₁0H₂2. The mixture is
combusted in an excess of oxygen. What mass of CO₂ is generated from the combustion of 10.1 kg of the mixture?
mass of CO₂:
2.090
Incorrect
kg
Physical Chemistry
GeneralWhich is an example of pseudoscience?
use of X-rays to observe the bones of the arm
O use of DNA analysis to determine paternity
use of vaccines to prevent the occurrence of disease
use of astrology to predict the personality of a child
Physical Chemistry
GeneralSuppose you have Avogadro's number of mini marshmallows and use them to cover the state of New Mexico which has a land
area of 1.214 × 105 mi². Each mini marshmallow has a diameter of 0.635 cm and a height of 2.54 cm. Assuming the
marshmallows are packed together so there is no space between them, to what height above the surface, in kilometers, will the
mini marshmallows extend?
height:
6213.3
km
Physical Chemistry
GeneralCalorimetry is used to study the change in enthalpy and determine enthalpies of reaction by controlling
which of the following variable(s)?
a. Volume
b. Pressure
c. The transfer of heat between the universe and the system and surroundings under study
d. All of the above
Physical Chemistry
GeneralChoose the appropriate answer.
The left handed pitcher threw fastballs at almost 100 miles per hour.
The left-handed pitcher threw fastballs at almost 100 miles-per-hour.
The left-handed pitcher threw fastballs at almost 100 miles per hour.
Physical Chemistry
GeneralWhich of the statements describe a mole?
Avogadro's number of items
the amount of a substance containing the same number of formula units as there are atoms in 12 g of carbon
6.022 x 1023 items
mass x acceleration
Physical Chemistry
GeneralChoose the appropriate answer.
We ate chocolate-filled-pastries for dessert.
We ate pastries for dessert that were chocolate-filling.
O We ate chocolate-filled pastries for dessert.
Physical Chemistry
GeneralMexican Muralist movement
This art movement began in Mexico in the early 1920s when, in an effort to increase
literacy, Education Minister José Vasconcelos commissioned artists to create
monumental didactic murals depicting Mexico's history on the walls of government
buildings. Artists of the Mexican Muralist movement include José Clemente Orozco,
Diego Rivera, and David Alfaro Siqueiros.
Middle ground
The part of the picture that is between the foreground and background.
Minimalism
An artistic movement of the 1960s in which artists produced pared-down three-
dimensional objects devoid of representational content. Their new vocabulary of
simplified, geometric forms made from humble industrial materials challenged
traditional notions of craftsmanship, the illusion of spatial depth in painting, and the
idea that a work of art must be one of a kind.
Source: https://www.moma.org/learn/moma_learning/glossary
A glossary
A thesaurus
An online dictionary
Physical Chemistry
GeneralWhy does the glossary for New York's Museum of Modern Art often include links to
works by individual artists?
In this way, the museum hopes to attract new visitors.
These works illustrate the concepts defined in the glossary.
When a definition is very short, the links make it appear longer.
Physical Chemistry
GeneralConvert 1.00 g of each element to moles.
How many moles of calcium are in 1.00 g?
1.00 g Ca =
How many moles of zinc are in 1.00 g?
1.00 g Zn =
How many moles of xenon are in 1.00 g?
1.00 g Xe =
mol Ca
mol Zn
mol Xe
Physical Chemistry
GeneralA small child goes to touch a hot stove and burns their hand. The child then puts their hand into a bowl
of ice water to relieve the pain. Which answer best describes the changes in the thermal motion of the
particles in the hand of the child?
a. Remains the same
b. Increases and then decreases
c. Decreases and then increases
d. None of the above
Physical Chemistry
GeneralFrom the context, find the meaning of the word dissipated.
Gray smoke spurted out of the stubby stove-pipe, spurted up a long way before it
spread out and dissipated.
Decayed
Vanished
Demolished
Physical Chemistry
GeneralThe vocabulary section for this lesson most closely resembles which reference tool?
Vocabulary
1. Dictionary: A comprehensive reference tool containing words, listed alphabetically,
with their precise definitions and other relevant information.
2. Thesaurus: A reference tool containing words, listed alphabetically, with their
synonyms and antonyms.
3. Glossary: A reference tool containing specialized terms, listed alphabetically, with
their definitions.
4. Guide words: In a dictionary, the first and last words on a page, listed in the top
corner.
5. Etymology: The origin of a word and the history of its development.
6. Phonetic spelling: A system of spelling in which each letter represents invariably
the same spoken sound.
A thesaurus
A citation guide
A glossary
Physical Chemistry
GeneralTin has 10 stable isotopes. The heaviest, 124Sn, makes up 5.80% of naturally occurring tin atoms.
How many atoms of 124Sn are present in 95.0 g of naturally occurring tin?
atoms of 124Sn:
4.16 X1023
Incorrect
What is the total mass of the 124Sn atoms in this sample?
total mass of the 124Sn:
0.691
atoms
9
Physical Chemistry
GeneralAn equilibrium reaction has a Ke of 2.7 x 10-6. Which of the following accurately describes the chemical equilibrium for this reaction?
► View Available Hint(s)
O The concentrations of the products are approximately the same as the concentrations of the reactants.
O The concentrations of the reactants are less than the concentrations of the products. The equilibrium is said to favor the reactants.
O The concentrations of the products are less than the concentrations of the reactants. The equilibrium is said to favor the reactants.
O The concentrations of the products are greater than the concentrations of the reactants. The equilibrium is said to favor the products.
Physical Chemistry
General1. Consider the reaction shown below:
CaCO3 (s) + 2 HCl (aq) → CaCl2 (aq) + CO₂ (g) + H₂O (1)
a) How many mL of 0.55M HCl are needed to react with 3.7 g of CaCO3?
b) After the reaction has gone to completion, what volume of CO2 gas can be collected
at 25.0°C and barometric pressure of 755 mmHg? (Vapor pressure of water at 25.0°C
is 23.8 mmHg)
Physical Chemistry
GeneralTia has a sample of pure gold (Au). She weighed the sample and the result was 34.3 grams. Tia wants to determine the number
of atoms in the sample. Calculate the number of atoms in 34.3 g of pure gold.
Physical Chemistry
GeneralThe molecules that transport cholesterol from dead or dying cell back to the liver are called?
O High-density lipoproteins (HDLs)
O Low-density lipoproteins (LDLs)
O Intermediate-density lipoproteins (IDLs)
O Very low-density lipoproteins (VLDLs)
O Chylomicrons
Physical Chemistry
GeneralThe samarium-147 nuclide radioactively decays by alpha emission. Write a balanced nuclear chemical equation that describes this process.