Chemistry Flashcards
To identify the chemical compounds dissolved in a sample, a student dips a clean piece of nichrome wire into the sample and burns it in a flame. By name or number, identify all of the following five substances that might be present if the flame burns blue: 1) Selenium 2) Sodium 3) Arsenic 4) Boron 5) Lead
Selenium, Arsenic, Lead
Given that the balanced chemical equation for the reaction of oxygen and ethane is 2 C2H6 + 7 O2 –> 4 CO2 + 6 H2O, if 16 grams of O2 react with excess C2H6, to the nearest gram, how many grams of CO2 will be reacted?
13
How many lone pairs of electrons are on the phosphorus atom in PF3 ?
1
Given the balanced equation H2SO4 + 2 NaOH –> Na2SO4 + 2 H2O, in an acid-base titration, 25 milliliters of 0.2 molar H2SO4 were required to neutralize 100 milliliters of NaOH solution. Providing your answer as a decimal to the nearest tenth, what is the molarity of the NaOH solution?
0.1
Which of the following molecules contains only one non-bonding pair of valence electrons?
W) HCN
X ) NH4 +
Y ) C2H4
Z ) N2
W) HCN
Given the balanced equation 2 C4H10 + 13 O2 –> 8 CO2 + 10 H2O, what is the percent yield of water if 15 moles of water is obtained when 4 moles of butane is burned in excess oxygen?
75%
What is the hybridization of xenon atom in xenon tetrafluoride?
sp3d2
A 2.00 mole sample of ammonium nitrate is decomposed in a bomb calorimeter. The temperature if the calorimeter increases by 12 Kelvin. The heat capacity of the system is 1.5 kilo joules per Kelvin. What is the molar heat of decomposition of ammonium nitrate in kilojoules?
9
To identify the chemical compounds dissolved in a sample, a student dips a clean piece of nichrome wire into the sample and burns it in a flame. The flame burns red. What metal does the mixture probably contain?
Calcium ( Lithium, Strontium, Rubidium)
What are the decay mode and the daughter nuclide, respectively, of potassium-37 ?
Electron Capture, Argon-37
Give the specific name for the following function group: a nitrogen atom bonded to two carbon chains and a hydrogen atom?
Secondary Amine
At 25 degree Celsius, the vapor pressure of water is about 3 kilo pascals and the vapor pressure of methanol is about 15 kilo pascals. Assuming no deviation from Raoult’s law, determine the vapor pressure, in kilo pascals, of a mixture of 1 mole of methanol and 2 moles of water.
7
By name or number, identify all of the following four substances that are substitutional alloys: 1) brass 2) steel 3) sterling silver 4) pewter
1, 3, 4
A chemist is trying to identify a chemical by determining its molar mass. A sample weighting 0.75 grams was dissolved in 0.10 kilograms of benzene of 5 degree Celsius kilograms per mole, what is the molar mass of the chemical in grams per mole to the nearest whole number?
75
A well near the beach is suspected to be contaminated with chloride ions from sea water. If chloride is present, which of the following will produce a cloudy suspension when mixed with water?
W) Silver Nitrate
X ) Sodium Nitrate
Y ) Potassium Acetate
Z ) Calcium Bromide
W) Silver Nitrate
The molar mass of carbon dioxide is 44 grams. Providing your answer to the nearest integer, if 88 grams of solid carbon dioxide sublimates, how many liters of carbon dioxide gas will be formed at standard temperature and pressure?
45
Which of the following has a melting point of 185 degree Celsius and readily dissolves in water at room temperature, but is NOT an electrolyte:
W) NaCl
X ) Decane
Y ) Methane
Z ) Sucrose
Z ) Sucrose
Give the systematic chemical name for the following ionic compound : Cr2(SeO4)3
Chromium (III) Selenate
Which of the following is a substance whose molecular and empirical formula are NOT the same?
W) Benzene
X ) Water
Y ) Ammonia
Z ) Sulfur Dioxide
W) Benzene
Which of the following is a molecule with a square pyramidal molecular geometry around its central atom?
W) PCl5
X ) ClF5
Y ) XeF4
Z ) SF6
Y ) XeF4
PCl5: Trigonal Bipyramidal; XeF4: Square Planar; SF6: Octahedral
An organic compound with the formula C6H14 is an:
W) Alkane
X ) Alkene
Y ) Alkyne
Z ) Arene
W) Alkane
Alkane : (C n) (H 2n+2)
Which of the following gases has the highest effusion rate through a pinhole opening from one compartment to another and at room temperature?
W) Argon
X ) CO2
Y ) SO2
Z ) Helium
Z ) Helium
Name all of the following three concentration units that are temperature-dependent: molal; Molarity; Normality
Molarity; Normality
Calculate the enthalpy of vaporization, in kilo joules, of water at 25 degree Celsius and at 1 atmosphere. Assume the standard enthalpy of water gas is -286kJ and the standard enthalpy of water gas is -242kJ:
44
Enthalpy(reaction) = Final Enthalpy of products - Final Enthalpy of reactants = -242kJ - (-286)
Name the two spectator ions in the reaction of Lead(II) Nitrate and sodium sulfide.
NO3- and Na+
Place the following molecules or ions in order of increasing stability: He2, O2, O2 2-, He2 +, O2-
He2, He2+, O2 2-, O2-, O2
By the name or number, identify which of the following three species is paramagnetic 1) CO, 2) CO+ 3) CO2+
CO+
By name or number, order the following four elements from least to most exothermic electron affinity 1) Fluorine 2) Chlorine 3) Bromine 4) Iodine
Iodine, Bromine, Fluorine, Chlorine
Which of the following elements will react most vigorously with water to form Hydrogen gas as a byproduct?
W) Magnesium X) Barium Y) Potassium Z) Bismuth
Y) Potassium
If you want to separate a liquid mixture containing at least one volatile component, which of the following techniques could you use?
W) Scrubbing X) Stripping Y) Electrorefining Z) Effusion
Stripping
Which of the following compounds is NOT named correctly?
W) SnF2, Stannous Fluoride X) CuCl, Cuprous Chloride Y) PbO2, Plumbic Oxide Z) FeO, Ferric Oxide
Z) Ferric Oxide
The following gaseous phase reaction is in equilibrium: CO+H2 CH3OH. If you decrease the volume of the container holding the gas, what happens to the equilibrium?
Shifts to the right(More Methanol is produced, more product is produced.)
By the name or number, identify all of the following four motions that describe how atoms in a methylene group can vibrate: 1) Rocking 2) Symmetrical stretching 3) see-sawing 4)twisting
1,2,4
Which of the following pairs does NOT correctly match the element and its oxidation number? W) Oxygen in H2O2, 2- X ) Bromine in Br2, 0 Y ) Sodium in NaCl, 1+ Z ) Sulfur in SO3 2- and +4
W) Oxygen in H2O2 and 2-
Identify by name or number all of the following five factors upon which the rate of a gaseous phase reaction substantially depends: 1) reactant concentration 2) molecule size 3) number of distinct products and reactants 4) activation energy 5) pressure
1,4,5
Which of the following compounds is generally considered soluble in water? W) Sodium Nitrate X ) Magnesium Carbonate Y ) silver chloride Z ) Barium Sulfate
W) Sodium Nitrate
Nitrous acid plus calcium hydroxide yield calcium nitrite plus water. which of the following represents the coefficients for the compounds, in the order listed, when reaction is correctly balanced?
W) 1,2,1,1 X) 1,1,1,1 Y) 2,2,1,2 Z) 2,1,1,2
Z) 2,1,1,2
Name two of the elements that are common exceptions to the octet rule, because they are frequently found in compounds in which they have only six valence electrons.
(Accept 2) Boron, Aluminum, Beryllium
Regarding butylene’s Alkene isomers, which of the following statement is correct?
W) Some are cis-trans isomers
X ) Some are chiral
Y ) Some are enantiomers
Z ) Some are atropisomers
W) Some are cis-trans isomers
In which of the following compounds does nitrogen have an unpaired electron?
W) Ammonia X) Nitrous oxide Y) Sodium nitrate Z) Nitric oxide
Z) Nitric oxide
A saturated solution of calcium hydroxide is titrated with aqueous hydrochloric acid. Using proper chemical nomenclature and indicating the state of each substance, such as solid, liquid, aqueous, or gas, what is the balanced molecular equation for this reaction?
Ca(OH)2(aq)+ 2HCl(aq) -> CaCl2(aq)+ 2H2O(l)
Which of the following is NOT a colligative property of a solution? W) Freezing point depression X) Osmotic pressure Y) Percent by mass Z) Boiling point elevation
Y) PERCENT BY MASS
How many liters of 2 molar sulfuric acid are required to titrate three liters of 0.4 molar nitric acid?
0.3
When the equation O2 + C6H14 -> CO2+ H2O is balanced with the lowest whole number coefficients, what is the coefficient of O2?
19
Given the reaction: 4PH3(aq) -> P4(g)+ 6H2(g), if 0.0048 moles of PH3 are consumed each second of the experiment, providing your answer to the nearest ten thousandth, what is the rate of production in moles per second of P4?
0.0012
Which of the following species is NOT considered an electrolyte? W) Sodium hydroxide X) Hydrogen chloride Y) Aluminum nitrate Z) Diethyl ether
Z) DIETHYL ETHER
By name or number, identify all of the following four substances that would show a positive result in a Benedict’s test: 1) simple sugars, 2) starches,
3) proteins, 4) lipids.
1) Simple Sugars
About how many calories per gram will it take to sublimate water at standard pressure?
W) 180 X) 360 Y) 540 Z) 720
Z) 720 (sublimation is solid -> vapor; 80 cal + 100 cal + 540 cal = 720 cal)
A Buchner funnel is a piece of laboratory glassware often used in chemistry labs for which of the following procedures: W) combustion X) filtration Y) centrifugation Z) distillation
X) filtration
Which of the following is one of the main reasons why oxygenates are used as gasoline additives:
W) allow for more complete combustion X) decrease sulfur buildup in engine pistons Y) prevent water condensation in stored fuels Z) corrosion inhibition
W) allow for more complete combustion
Consider the following equilibrium reaction, PCl5(gas) PCl3(gas)+ Cl2(gas)
. If a 2 mole sample of PCl5 dissociates to give 0.2 moles of Cl2 at equilibrium, find the molar amounts, to the 1st decimal place, of PCl5 at equilibrium:
1.8 (2 - 0.2)
What are the 2 alkenes with the shortest carbon chains and lowest molecular weights?
ETHYLENE; PROPYLENE (ACCEPT: ETHENE; PROPENE)
Arrange the following 4 metals in order of increasing reactivity in dilute HCl: zinc; aluminum; gold; calcium
GOLD; ZINC; ALUMINUM; CALCIUM
What is the general name for a substance that facilitates a chemical reaction by providing an alternative reaction pathway with a lower activation energy while remaining unaltered?
Catalyst
You need to prepare 500 milliliters of a 0.100 molar NaOH solution from a 0.250 molar solution. What volume, in milliliters, of the 0.250 molar solution must be diluted to 500 milliliters?
200 (M1V1= M2V2; (0.250M)(x) = (0.100M)(500ml),x= 200 ml)
A solution is prepared by mixing 1 gram of ethanol with 100 grams of water to give a final volume of 101 milliliters. Calculate to the nearest integer the mass percent of ethanol in the solution.
1
What is the conjugate acid in the reaction of sulfuric acid and sodium hydroxide?
Water
Which of the following is a covalent bond formed by orbitals overlapping end to end? W) Alpha X) Beta Y) Sigma Z) Pi
Y) Sigma
The radius of a gold atom is 144 picometers and its density is 19.32 grams per cubic centimeter. What kind of crystal structure does the unit cell of elemental gold have?
FACE CENTERED CUBIC
The convex meniscus of mercury in a capillary tube indicates which of the following?
W) Mercury is highly attracted to glass
X) Mercury is polar
Y) Mercury’s cohesion is greater than its adhesion
Z) Mercury is soluble in water
Y) MERCURY’S COHESION IS GREATER THAN ITS A DHESION
What compound is the reducing agent in the reaction:
CH4 + 2O2 -> CO2 + 2H2O
CH4
Which of the following series of spectral line emissions of the hydrogen atom is in the visible spectrum? W) Paschen X) Balmer Y) Brackett Z) Lyman
X) Balmer
To check the accuracy of a graduated cylinder, a student repeatedly filled the cylinder to the 25 milliliter mark using water delivered from a buret and then read the volume delivered. The results of the trials in milliliters were as follows: 1) 26.54, 2)26.51, 3) 26.60, 4) 26.49, and 5) 26.57. What type of error do these results primarily demonstrate?
W) Systematic
X) Random
Y) Conceptual
Z) Observational
W) Systematic
In scientific notation, one attojoule is equal to how many joules?
1x10^-18
What is the IUPAC name of the compound PbCO3?
Lead(II) Carbonate
Reduction involves which of the following?
W) Gain of electrons and increase in oxidation number
X) Loss of electrons and increase in oxidation number
Y) Gain of electrons and decrease in oxidation number
Z) Loss of electrons and decrease in oxidation number
Y) GAIN OF ELECTRONS AND DECREASE IN OXIDATION NUMBER
By number, identify all of the following four statements that are TRUE
: 1) liquids with large intermolecular forces tend to have very low boiling points, 2) liquids with large intermolecular forces tend to have considerable surface tension, 3) ethanol has a higher boiling point than methanol, 4) the hardness of diamond is due to strongvan der Waals forces.
2, 3
Which of the following is TRUE about the solubility of a gas in water?
W) It increases as both temperature and partial pressure of the gas rise
X) It increases as temperature rises but decreases as partial pressure of the gas rises
Y) It decreases as temperature rises but increases as partial pressure of the gas rises
Z) It decreases as both temperature and partial pressure of the gas rise
Y) IT DECREASES AS TEMP ERATURE RISES BUT INCREASES AS PARTIAL PRESSURE OF THE GAS RISES
Plastics with the recycling symbols of 2 and 4, such as those used to make plastic bags, are produced from what monomer?
ETHYLENE (ACCEPT: ETHENE)
Which of the following statements is usually TRUE about an unsaturated fatty acid?
W) It is from vegetable sources and is solid at room temperature
X) It is from vegetable sources and is liquid at room temperature
Y) It is from animal sources and is solid at room temperature
Z) It is from animal sources and is liquid at room temperature
X) IT IS FROM VEGETABLE SOURCES AND IS LIQUID AT ROOM TEMPERATURE
Making biodiesels is a transesterification reaction. Which of the following represents the product(s) of this reaction?
W) Phosphodiesters and glycerol
X) Fatty acid esters and glycerol
Y) Fatty acids and alcohol
Z) Acetyl-ethyl ester
X) FATTY ACID ESTERS AND GLYCEROL
Recycling code 2 indicates which of the following types of plastic? W) Polyvinyl chloride X) Polystyrene Y) High-density polyethylene Z) Polyethylene terephthalate
Y) High-density polyethylene
Short Answer If 4.67 grams of butane reacts with 23.12 grams of molecular oxygen to produce 2.67 grams of carbon dioxide, what is the limiting reactant?
BUTANE
Sodium azide and potassium nitrate react to inflate an airbag during a car crash primarily by producing which of the following gases? W) Nitrogen X) Oxygen Y) Potassium oxide Z) Sodium nitrate
W) NITROGEN
What element corresponds to the electron configuration 1s2 2s2 2p5 ?
FLUORINE
In which of the following sets of elements would all members be expected to have very similar chemical properties?
W) Neon, oxygen, and fluorine
X) Argon, bromine, and krypton
Y) Magnesium, calcium, and barium
Z) Aluminum, silicon, and phosphorus
Y) Magnesium, calcium, and barium
Which of the following is an example of effusion?
W) The formation of snowflakes in the upper atmosphere
X) A hot air balloon flight
Y) The evaporation of water from a lake
Z) Abike tire losing air after running over a nail
Z) Abike tire losing air after running over a nail
When hydrochloric acid in an aqueous solution reacts with solid sodium bicarbonate, what are the products?
CARBON DIOXIDE, WATER, AND SODIUM CHLORIDE
Which of the following factors does NOT affect the solubility of a solid in a liquid? W) Temperature X) Polarity of solute Y) Polarity of solvent Z) Pressure
Z) Pressure
Which of the following period 3 elements has the smallest atomic radius? W) Sodium X) Phosphorus Y) Chlorine Z) Aluminum
Y) CHLORINE
What is the SI prefix that multiples a unit by a factor of 10^18?
EXA
How many atoms are in one molecule of butane?
14
Nuclides that have neutron-to-proton ratios that are too high compared with stable nuclides tend to undergo what kind of decay?
BETA (BETA MINUS)
Which of the following metals could NOT successfully be used to galvanize iron? W) Zinc X) Aluminum Y) Manganese Z) Nickel
Z) Nickel
Isoelectronic atoms and ions are identical in which of the following ways? W) Electron affinity X) Ionization energy Y) Electron configuration Z) Effective nuclear charge
Y) Electron configuration
How many electrons with quantum number l=1(read as: L equals 1) are in an atom of silicon in its ground state?
8
Which of the following statements is TRUE of ceramics? W) They are homogeneous X) They are heterogeneous Y) They are chelates Z) They are a form of glass
X) They are heterogeneous
Which of the following elements has the valence electron configuration of 3s2 3p3 ? W) Phosphorus X) Oxygen Y) Bromine Z) Nitrogen
W) Phosphorus
Which of the following represents the electron-pair geometry of the central oxygen atom of ozone? W) Linear X) Trigonal planar Y) Tetrahedral Z) Trigonal bipyramidal
X) Trigonal planar
Within a single atom, what is the maximum number of electrons that can fit in an atomic shell defined by the quantum numbers n = 3 and l=2 ?
10
What is the IUPAC name for SnCl2 . 6H2O?
TIN (II) CHLORIDE HEXAHYDRATE
By name or number, list all of the following five substances that
are NOT Newtonian fluids: 1) gasoline, 2) yogurt, 3) water, 4) blood, 5) ketchup.
YOGURT, BLOOD, AND KETCHUP (ACCEPT: 2, 4, AND 5)
Which of the following can bond to a metal ion? W) Ligand X) Lewis acid Y) Bronsted-Lowry acid Z) Enantiomer
W) Ligand
How many milliliters of 0.75 molar HCl are required to completely neutralize 25.0 milliliters of 0.15 molar Ba(OH)2 ?
10
Which of the following types of decay does uranium-238 experience in order to yield thorium-234? W) Alpha X) Beta Y) Double beta Z) Gamma
W) ALPHA
According to the second law of thermodynamics, what effect does a spontaneous reaction have on the entropy of the universe?
INCREASES THE ENTROPY OF THE UNIVERSE (ACCEPT: INCREASES)
Which of the following is the term for the mixing of atomic orbitals to explain covalent bonds? W) Transmutation X) Ionization Y) Hybridization Z) Localization
Y) Hybridization
How many moles of oxygen are contained in one mole of ammonium sulfate?
4
Denatured alcohol contains which of the following toxic substances added to ethanol? W) Propanol X) Methanol Y) Hexanol Z) Octanol
X) Methanol
Pyrex glassware contains silicon dioxide, which has acidic properties and should not be used to store which of the following? W) Dihydrogen monoxide X) Acetic acid Y) Sodium chloride Z) Sodium hydroxide
Z) Sodium hydroxide
What is the name given to the only temperature and pressure at which all three phases of water can be in equilibrium with each other?
TRIPLE POINT
What subshell is incompletely filled in all of the elements in the lanthanide series?
4f
A pure element when mixed with an ionic compound is most likely to undergo which of the following kinds of reactions? W) Single replacement X) Double replacement Y) Synthesis Z) Combustion
W) Single replacement
Which of the following is an alternative name for 1,3-xylene? W) Ortho-xylene X) Meta-xylene Y) Para-xylene Z) Cis-xylene
X) Meta-xylene
Specifying the sign, what is the oxidation state of nitrogen in the neutral compound iron (II) nitrate?
+5 (Do Not Accept: 5)
When calcium chloride is dissolved in water, its van’t Hoff factor would be closest to what whole number?
3
When the change of enthalpy of a reaction is negative and the change of entropy of the same reaction is positive, the reaction is which of the following?
W) Always spontaneous
X) Spontaneous only under high temperature conditions
Y) Spontaneous only under low temperature conditions
Z) Never spontaneous
W) Always spontaneous
By name or number,identify all of the following four diatomic molecules whose bond strength would decrease after the removal of an electron to form a positively
charged ion: 1) H2, 2) B2, 3)ClBr,4) OF.
H2, B2, ClBr (ACCEPT:1, 2, AND 3)
What do we call a liquid that has been heated to a temperature beyond its boiling point?
SUPERHEATED
By name or number, identify all of the following five elements that can form compounds with an expanded octet: 1) beryllium, 2) oxygen, 3) phosphorus, 4) fluorine, 5) xenon.
PHOSPHORUS AND XENON (ACCEPT: 3 AND 5)
When chemists do flame tests, they often view the flame through a colored transparent piece of glass to filter out any sodium contamination. What color glass do they use?
COBALT BLUE (ACCEPT: BLUE, COBALT)
Specifying the sign, what is the oxidation state of phosphorus in Na2P2O6?
+5 (DO NOT ACCEPT: 5)
What element has the lowest boiling point?
HELIUM
Which of the following bonds is the MOST polar? W)B-C X)B-N Y)B-O Z)B-F
Z)B-F
Which of the following substances has the highest boiling point? W) Water X) Methanol Y) Ethyl alcohol Z) Diethyl ether
W) Water
The pressure of 2 moles of an ideal gas at 27 Degree Celsius is 1.2 atmospheres. Providing your answer to the nearest tenth, if the temperature is increased by 100° Celsius and the volume of the gas doubles , what is the new pressure of the gas in atmospheres?
0.8
What is the common name given to the industrial reaction in which nitrogen and hydrogen are reacted with a catalyst, forming ammonia?
HABER PROCESS
What is the molecular formula for strontium nitrite?
Sr(NO2)2
L-alanine and D-alanine are BEST classified as what type of isomers: W) cis X) trans Y) structural Z) optical
Z) OPTICAL
How many sigma and pi bonds, respectively, are there in a molecule with the following formula: CH3CHCHCH2CH3
SIGMA 14; PI = 1
Which of the following are the units of the rate constant for a 2nd order reaction given that concentration is measured in molarity and time in seconds: W) M^-2 s^-1 X) M^-1 s^-1 Y) M s^-1 Z) M^-2 minutes^-1
X) M^-1 s^-1
Solution: units relationship is M1^-1order x time^-1
1.0 gram of an unknown organic molecule is dissolved in 50.0 grams of benzene. Determine the molecular mass of the unknown if this solution freezes at 4.5ºC. Assume the freezing point constant of benzene is 5.0ºC per molal, and the freezing point of benzene is 5.5ºC. Give your answer to the nearest whole number in grams per mole.
100
(Solution: ΔTf = 5.5º- 4.5º = 1.0ºC; m=ΔTf/ Kf = 1.0º/5.0º = 0.2m or 0.2mol/kg; (1.0g unkn/0.05 kg benz)(1kg benz/0.2 mol unkn) = 100 g/mol)
Consider the following equilibrium reaction, FeO(solid) + CO(gas) Fe(solid) + CO2(gas), where ∆H equals -10 kilojoules. Which of the following would have a similar effect on the equilibrium position as lowering the temperature: W) adding iron X) increasing pressure Y) removing carbon dioxide Z) removing carbon monoxide
Y) REMOVING CARBON DIOXIDE
Solution: shifts to the right
In the electrolysis of water, if a very small amount of sodium sulfate is added to the water, give the equation for the half reaction that occurs at the ANODE. Make sure to indicate proper charges and the state of each substance, such as solid, liquid, aqueous,or gas:
2 H2O(liquid) -> O2(gas)+4H+(aqueous)+ 4e-
What is the overall reaction order for the following rate law:
rate = k[NH4+][NO2-] (read as: k times the concentration of NH4+ times the concentration of NO2-)
2 (ACCEPT: 2ndORDER)(Solution: exponents 1 + 1 = 2)
Calculate the one-atmosphere boiling point elevation, in degrees Celsius to the 2nd decimal place, for a solution made by dissolving 1 gram of solute in 0.1 kilograms of water. Assume the formula weight of the solute is 300 and the boiling point depression constant is 2.0ºC per molal..
0.07(ACCEPT: 0.06)(Solution: moles solute = 1g/300g/mol = 0.003m; m= 0.0033 moles solute /0.1kg = 0.033mΔTb= Kb(m)= (2.0ºC/m)(0.033m) = 0.066ºC)
As an acetic acid solution is diluted, will the hydrogen ion concentration and the percentage of ionization, respectively,increase, decrease or remain the same?
THE HYDROGEN ION CONCENTRATION WILL DECREASE; THE PERCENTAGE OF IONIZATION WILL INCREASE
In a sulfuric acid solution, which of the following will be present in the highest concentration: H+, H2SO4, HSO4 1-, SO4 2-, or OH 1-.
H+
To the nearest whole degree Celsius, at what temperature is water the densest?
4
Most of the peptide chains in a myoglobin molecule adopt what secondary structure?
HELIX
The degree of unsaturation of a hydrocarbon containing two rings is equivalent to the degree of unsaturation of a hydrocar bon containing an: W) Alkane X) Alkene Y) Alkyne Z) Alcohol
Y) ALKYNE
The dehydrogenation of a single C-C bond within a hydrocarbon leads to what change in the number of hydrogens in the molecule?
LOSS OF 2 HYDROGENS
Which of the following does not describe how atoms in a CH2 group can vibrate? W) Rocking X) Symmetrical stretching Y) See-sawing Z) Twisting
Y) SEE-SAWING
A chemist is trying to interpret the results of his Infra-Red Spectroscopy analysis of a compound. He sees a band of high absorbance, arou nd 95%, at about 1775 inverse centimeters. What functional group does his compound most likely contain?
CARBONYL
