General organic chemistry Questions and Answers
Organic Chemistry
General organic chemistryBe sure to answer all parts.
Draw a valid Lewis structure for each molecule.
a.
HBr
b. C₂HCI
Organic Chemistry
General organic chemistryA 20.0 L cylinder of oxygen gas is at a temperature of 27.0°C and a pressure of 5.00 atm. What is the density of the oxygen gas
in the cylinder?
3.25 g/L
6.50 g/L
.0.203 g/L
72.0 g/L
Organic Chemistry
General organic chemistry[References]
Freon-12 (CCl₂F2) is used as a refrigerant in air conditioners and as a propellant in aerosol cans. Calculate the number of molecules of Freon-12 in 5.90 mg of Freon-12.
molecules
What is the mass of chlorine in 5.90 mg of Freon-12?
Mass=
mg
Organic Chemistry
General organic chemistryLabel each statement as "true" or "false."
a. Ionic compounds have high boiling points.
(select)
b. The ions in a crystal lattice are arranged randomly and the overall charge is zero.
(select)
c. When an ionic compound dissolves in water, the solution conducts electricity.
(select)
d. In an ionic crystal, ions having like charges are arranged close to each other.
(select)
Organic Chemistry
General organic chemistryA chemist prepares a solution of sodium chloride (NaCl) by measuring out 64.1 μmol of sodium chloride into a 350. mL volumetric flask and filling the flask
to the mark with water.
Calculate the concentration in μmol/L of the chemist's sodium chloride solution. Be sure your answer has the correct number of significant digits.
Organic Chemistry
General organic chemistryGive the name of each ion.
a. Cl-
chloride chloride (I) chlorine chlorine (I)
b. Cr²+
chromium (II) chromium (III) chromate chromic
c. Li
lithic lithium lithous lithate
d. K
potassous pottassate
Organic Chemistry
General organic chemistryType your answer in the box.
Fill in the blanks to provide the correct name for each lon below. Include the element name and charge
where appropriate. Do not capitalize the element name.
Ca²:
AP:
Fe":
Pb":
Organic Chemistry
General organic chemistryA student fills a flask with 5.0 moles of nitrogen gas and then seals the flask. Which change will happen when the student cools
the flask?
The temperature of the nitrogen gas will increase
The volume inside the flask will decrease.
The pressure inside the flask will decrease
The molar mass of the nitrogen gas will increase.
Organic Chemistry
General organic chemistryA sample of a compound is added to distilled water in a clean beaker. A reaction occurs, and the water temperature rises rapidly. Which of the following
statements is best supported by this observation?
A dehydration reaction occurred.
The beaker was contaminated by another compound.
An endothermic reaction occurred.
An exothermic reaction occurred.
Organic Chemistry
General organic chemistryThe specific heat of copper is about 0.4 joules/ gram ºC. How much heat is needed to change the temperature of a 30-gram
sample of copper from 20.0 °C to 60.0 °C?
480 J
1000 J
240 J
720 J
Organic Chemistry
General organic chemistryA ship cabin has a volume 7.32 x 10 8 L and pressure of 966 KPa. Calculate the pressure in the cabin when temperature changes
from 24 °C to 36 °C.
Organic Chemistry
General organic chemistryCompare the boiling points of cyclopentane and cyclobutane. Use this
information to put the following compounds in order from lowest to highest
boiling point: cyclohexane, cyclobutane, cyclopropane, cyclopentane.
I
Organic Chemistry
General organic chemistryBe sure to answer all parts.
How many protons and electrons are present in each ion?
a. Mg2+ b. V2+
a. _ protons and _ electrons
b. _ protons and _ electrons
Organic Chemistry
General organic chemistryBe sure to answer all parts.
Draw a Lewis structure for each covalent molecule.
a. CH3F
b. N₂H4
Organic Chemistry
General organic chemistryFor the following reaction, 23.4 grams of iron are allowed to react with 5.57 grams of oxygen gas.
iron (s) + oxygen (g) → iron(II) oxide (s)
What is the maximum amount of iron(II) oxide that can be formed?
What is the FORMULA for the limiting reagent?
What amount of the excess reagent remains after the reaction is complete?
Organic Chemistry
General organic chemistryAvogadro's hypothesis states that:
at the same temperature and pressure, equal
volumes of different gases contain an equal
number of particles.
a given compound always contains exactly
the same proportion of elements by mass.
each atom of oxygen is 16 times more
massive than an atom of hydrogen.
when two elements form a series of
compounds, the ratios of masses that
combine with 1 gram of the first element can
always be reduced to small whole numbers.
mass is neither created nor destroyed in a
chemical reaction.
Organic Chemistry
General organic chemistryIn an oxidation-reduction
reaction, electrons are transferred
from the substance being oxidized to the substance being reduced
from the substance being oxidized to the reducing agent
from the substance being reduced to the oxidizing agent
from the substance being reduced to the substance being oxidized
from the oxidizing agent to the reducing agent
Organic Chemistry
General organic chemistryQuestion 9 (5 points)
You are investigating an alien planet and discover that the planet has
many extremely heavy elements that do not exist on earth. You are able to
collect the following data about the isotopes of one mystery element:
Your Answer:
Based on this information, determine the average atomic mass of this
element.
Answer
Organic Chemistry
General organic chemistryZinc (Zn) is reacted with Hydrochloric acid (HCI) to form zinc chloride and hydrogen gas.
Zn (s) + 2 HCl(aq) → ZnCl2 (aq) + H₂ (g)
→
The reaction is carried out in a glass container that has a mass of 14.7 grams. After placing the zinc
in the glass container, the mass is 29.5 grams. The HCI solution is poured into the container and the
zinc chloride is formed. The excess hydrochloric acid is removed leaving the glass container and the
zinc chloride, which together have a mass of 37.5 grams. What is the percent yield?
Note: Show calculations for full credit.
Organic Chemistry
General organic chemistryNAD and NADPH are distinguished from each other by the
the sugar ring attached to the adenine.
A) adenine
B) phosphate group
C) carbon dioxide
D) nicotinamide
that's bonded to
Organic Chemistry
General organic chemistryQ1. What will be the correct R/S designation of the following molecule? (5 pts)
Q2. What is the relationship of the following pairs of compounds? (5 pts)
(A) Enantiomers (B) Conformational (C) Diastereomers (D) Meso
Organic Chemistry
General organic chemistryWhich of the following statements is FALSE?
Silicon is a metalloid
Germanium is a metal
Hydrogen is a non-metal
Gold is malleable
Sulfur does not conduct electricity
Organic Chemistry
General organic chemistryYour death will come to you, and never
You shall be, else, a slave of life,
Just waiting for a dawn's favor,
From nights of poverty and strife.
She'll build with you a common law,
One will of the Eternal Reign.
And you are not condemned to slow
And everlasting deadly pain.
Despair
Relationships
Death
Hate
Organic Chemistry
General organic chemistryFor the following elements, draw Lewis dot diagrams, arrows to show the transfer of electrons and charges. Then, write
the chemical formula and name for the compound. (3 points each)
sodium and phosphorus
Organic Chemistry
General organic chemistryWhich Lewis symbol for an ion is incorrect?
Multiple Choice
Na
Ca2+
Sn4+
Organic Chemistry
General organic chemistryIf a botanist wants to learn about a new method of crossbreeding orange trees so she can use the technique in her own experiments, what type of source should she use?
A. A primary source, because it will contain more details
B. A secondary source, because it is written by a scientist
C. A secondary source, because it will include more data
D. A primary source, because it will be easier to read
Organic Chemistry
General organic chemistryIf 1.28 moles of hydrogen react, how many water molecules will be produced, according to the following equation:
3H₂ + Fe₂O₃ → 2Fe + 3H₂O
Select the correct answer below:
(1) 7.71 X 10²⁴
(2) 1.28 x 10²⁴
(3) 7.71 x 10²³
(4) 1.28 x 10²²
Organic Chemistry
General organic chemistryCalculate the H₃O+ concentration from each pH:
(a) 4; (b) 9.
(a) ▭ x 10^▭M
(b) ▭ x 10^▭M
Organic Chemistry
General organic chemistryA 16.200 g sample contains 4.800 g F, 4.900 g H, and 6.500 g C. What is the percent composition of hydrogen in this sample?
Organic Chemistry
General organic chemistryBased on the periodic table, which atom would have the highest ionization energy: As, Br, K or Se? Enter the symbol for the atom with the highest ionization energy.
Organic Chemistry
General organic chemistryWhat is the molar mass of a gas if 1.15 g of the gas has a volume of 224 mL at STP?
Organic Chemistry
General organic chemistryA. CH₃CH₂COOH + KOH →
B. CH₃CH₂NH₂ + HCl →(no heat)
C. CH₃CH₂CONHCH₃ + HCl + H₂0 →
D. CH₃CH₂COOH + SOCl₂ →
E. CH₃COONa+ CH₃NH₃Cl (room temp, no Catalyst not amide formation→
D. CH₃CH₂CH₂COCl+ (CH₃)₂NH →
Organic Chemistry
General organic chemistryCompared to saturated fatty acids, unsaturated fatty acids have
A. lower melting points.
B. higher melting points
C. shorter carbon chains
D.longer carbon chains,
E. greater intermolecular attraction
Organic Chemistry
General organic chemistryConvert the following structural formulas to line-angle drawings.
(CH₃)₂ CHCOCH(CH₂CH₃)CH₃
Draw the molecule on the canvas by choosing buttons from the Tools (for bonds and charges.
Organic Chemistry
General organic chemistryWhich of the following is true for a system at equilibrium?
(A) The concentrations of reactants and products are equal.
(B) The rate constants for the forward and reverse reactions are always equal.
(C) The rate of the forward and reverse reactions are equal.
(D) All the above are true.
Organic Chemistry
General organic chemistryWhich of the following are spontaneous processes?
1. Ice melting at 1atm and 298 K (assume only ice is initially present).
2. Heat flowing from a hot object to a cold object.
3. An iron bar rusting.
A) 1 only
B) 2 only
C) 3 only
D) 1 and 3 only
E) 1, 2,' and 3
Organic Chemistry
General organic chemistryTwo kittens are sleeping by a furnace vent. They are relying mainly on what kind of heat transfer?
A. Chemical heating
B. Radiation warming
C. Convection heating
D. Thermal conduction
Organic Chemistry
General organic chemistryIn the reaction: CH₃COOH +CH₃OH ---> CH₃COOCH₃ + H₂O
the organic product can best be identified as
(A) an ester
(B) a ketone
(C) an organic acid
(D) an alcohol
Organic Chemistry
General organic chemistryAn atomic cation with a charge of +2 has the following electron configuration:
1s²2s²2p^6 3s'
What is the chemical symbol for the ion?
How many electrons does the ion have?
How many 2s electrons are in the ion?
Organic Chemistry
General organic chemistryDoes a buffered or unbuffered solution show the greatest change in pH when an acid or base is added? Why?
Organic Chemistry
General organic chemistryTo help farmers and gardeners, commercial fertilizers have a big three-number "NPK" label on the bag that gives the amounts of three key plant nutrients: nitrogen, phosphorus and potassium. For example, a bag of "10-10-10" fertilizer has 10% by mass nitrogen, 10% by mass potassium as potash (K,9), and 10% by mass phosphorus as phosphate (P2O5).
Suppose a certain fertilizer has the following composition:
INGREDIENT PERCENT BY MASS
Ammonium Phosphate [(NH4)3PO4] 17%
Calcium Nitrate [Ca(NO3)2] 31%
Urea [(NH2)2CO] 29%
Inert Ingredients 23%
What should the first (nitrogen) number on the bag label be? That is, calculate the percent by mass of nitrogen in this fertilizer. Round your answer to the nearest percent.
Organic Chemistry
General organic chemistryWhich compound is classified as a hydrocarbon?
(A) ethanoic acid
(B) chloroethane
(C) ethane
(D) ethanol
Organic Chemistry
General organic chemistryThe functional group-COOC-is found in
1. esters
2. aldehydes
3. organic acids
4. alcohols
Organic Chemistry
General organic chemistryWhat is the partial pressure in atmospheres of H₂, if a mixture has 5.0 moles of CO₂, 3.0 moles of N₂, and 1.0 mole of H₂? The container has a total volume of 5.73 L at room temperature of 25.00 °C.
• Your answer should have two significant figures (round your answer to one decimal places).
• Use R= 0.08206 L atm/mol K
Organic Chemistry
General organic chemistryWhich of the following statements is/are false?
a) The wavelength of microwave radiation is shorter than the wavelength of gamma radiation.
b) A car has a longer de Broglie wavelength than an atom when traveling at the same velocity.
c) A continuous spectrum contains no observable gaps, all wavelengths of a given range is observed.
Organic Chemistry
General organic chemistryAccording to Le Chatelier's principle, when the volume of a system is reduced, the reaction will shift...
(A) To the side with fewer gas molecules
(B) In favour of the endothermic reaction
(C) In favour of the exothermic reaction
(D) To the side with more gas molecules
Organic Chemistry
General organic chemistryDetermine if NaNH2 is a suitable reagent to deprotonate each
of the two compounds shown below.
l = yes; II = yes
l = no; II = no
l = no; Il = yes
l = yes; Il = no
Not possible to determine with the information provided
Organic Chemistry
General organic chemistryA gas mixture contains 0.45 mol of neon and 0.56 mol of xenon in a 4.00 L flask at 318 K. What is the total pressure of the mixture?
Select the correct answer below:
(A) 6.6 atm
(B) 0.80 atm
(C) 3.9 atm
(D) 3.7 atm
Organic Chemistry
General organic chemistry1. How many unpaired electrons are in the oxygen atom?
This atom is A. Paramagnetic
B. Diamagnetic
2. How many unpaired electrons are in the nickel atom?
This atom is A. Paramagnetic
B. Diamagnetic