Organic Chemistry Questions

What is the difference between mass number and atomic mass? Atomic mass is the mass of an atom. When the mass is expressed in u, the mass of a proton and of a neutron are both relatively small. Because the mass of an electron is one, the mass number approximates the atomic mass. O Atomic mass is the mass of an atom. When the mass is expressed in u, the mass of a proton and of a neutron are both approximately one. Because the mass of an electron is also one, the mass number approximates the atomic mass. O Atomic mass is the mass of an atom. When the mass is expressed in u, the mass of a proton and of a neutron are both approximately one. Because the mass of an electron is small relative to that of a proton or neutron, the mass exactly equals the atomic mass. O Atomic mass is the mass of an atom. When the mass is expressed in u, the mass of a proton and of a neutron are both approximately one. Because the mass of an electron is small relative to that of a proton or neutron, the mass number approximates the atomic mass.

After your fourth fraction, you have about 0.5 mL left in the round bottom. In order to get your last fraction, you must run the distillation till every last drop of liquid has become vapor A True B False

A rhodium atom has a radius of 173 pm. If you could string rhodium atoms like beads on a thread, how many atoms would you need to have a necklace 40. cm long?

A student saw the following nuclear symbol for an unknown element: 2x Which of the following statements about X and X-9 are true? (Select all that apply.) Ox2+ has 6 electrons. OX is beryllium. X has 9 neutrons in its nucleus. X-9 has a neutron/proton ratio of about 1.3. X is fluorine.

A gold atom has a radius of 145 pm. If you could string gold atoms like beads on a thread, how many atoms would you need to have a necklace 40. cm long?

Which best describes the isomer of the ion with the formula [CNO] that is the most stable? O Linear with a central O O Linear with a central N O Bent with a central C O Bent with a central N O Linear with a central C

Pacreatic lipase hydrolyzes TAGS to A. protein-binding units and fattyacylCoA B. Glycerol and 3 fatty acid molecules C. 2- monoacylglycerol and 2 fatty acid molecules D. diacylglycerol and 1 fatty acid molecule E. dehydrated fat and water

Based only on intermolecular forces, which of the following would be the least soluble in CH3OH? A) CH3CH2CH₂CH3 B) H₂O C) CH3CH₂OCH₂CH3 D) CH3CH₂OH

Ammonia is produced by the chemical reaction of hydrogen and nitrogen. N2(g) + 3H2(g) -> 2NH3(g) a. How many moles of H₂ are needed to react with 1.0 mole of N₂? b. How many moles of N2 reacted if 0.60 mole of NH3 is produced? c. How many moles of NH3 are produced when 1.4 moles of H₂ reacts?

1) A polysaccharide formed by plants. Humans cannot digest it. It passes unchanged through digestive track _____ 2) A polysaccharide formed by plants, during human digestion it produces large quantities of glucose units _____ 3) It is formed by glycerol and three fatty acids _____ 4) Are formed by a chemical reaction of fatty acids with strong bases such as NaOH _____ 5) A disaccharide found in milk and milk products that contain glucose and galactose _____ 6) Act as catalysts during digestion speeding up hydrolysis of carbohydrates, lipids and proteins _____ 7) Most prevalent and important monosaccharide in human body known as Blood sugar _____ 8) Formed by chains of aminoacids. They are the main structural components of muscles, skin and cartilages _____ 9) Most abundant lipids in cell membranes _____

What is the product obtained from the hydrolysis of a saturated triacylglycerol? Circle only one answer: a) Glycerol b) Glycerol and 3 saturated fatty acids c) Unsaturated fatty acids d) Saturated fatty acids f) Glycerol and 3 unsaturated fatty acids g) A saturated triacylglycerol

A strand of DNA has the base sequence 5' CTTTCT3'. Write the base sequence for the complementary strand.

Draw the reagents needed to produce C6H5-C≡C-T.

Draw cis-1-tert-butyl-3-ethylcyclohexane in its chair conformation using the templates. Perform a "ring flip" and draw the resulting chair conformation. Circle the more stable chair conformation. You may omit hydrogens if you want

Which of the following is the primary process by which a sedimentary rock transforms into an igneous rock? A. metamorphism B. melting C. erosion D. deposition

What drives the process of plate tectonics, the currently accepted explanation for the movement of drifting continents? A. gravity B. ocean currents C. convection in the mantle D. earthquakes

What is the definition of an alkyne? A. An alkyne is a hydrocarbon containing one or more triple bonds. B. An alkyne is a hydrocarbon containing two carbon double bonds. C. An alkyne is a hydrocarbon containing one or more multiple bonds. D. An alkyne is a hydrocarbon containing one or more double bonds.

Balance the following equation using whole numbers. What is the coefficient for CO₂? C6H14+ O₂ -> CO₂ + H₂O Select the correct answer below: A. 2 B.1 C. 19 D. 12

The polysaccharides amylopectin and glycogen are similar because a. they consist of identical numbers of monosaccharides. b. they cannot be broken down to monosaccharides in the human body. c. they consist of long chains of the monosaccharide glucose. d. they consist of long chains of the monosaccharide maltose. e. None of the above.

In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor. hydrogen + oxygen → water If you burn 35.3 g of hydrogen and produce 315 g of water, how much oxygen reacted?

You have (1R, 3S)-3-chlorocyclohexanol. Perform the following: a. Draw the structure with correct stereochemistry b. Draw the enantiomer of the original structure c. Label the most acidic hydrogen

Which of the following describes the octet rule? A. Atoms tend to gain or lose electrons to have 8 electrons at their outermost energy level. B. The first 8 electrons closest to the nucleus have the highest energy and participate in bonding. C. Atoms that have fewer than 8 electrons can only gain electrons. They cannot lose any. D. Up to 8 electrons can be part of a chemical bond.

An analytical chemist weighs out 0.067 g of an unknown monoprotic acid into a 250 mL volumetric flask and dilutes it to the mark with distilled water. He then titrates this solution with 0.1900 M NaOH solution. When the titration reaches the equivalence point, the chemist finds he has added 3.6 mL of NaOH solution. Calculate the molar mass of the unknown acid.

Enzymes are...................... that accelerates the rate of chemical reaction by ...................... A. inorganic compounds; lowering the activation energy B. biological catalyst; increasing the activation energy C. biological catalysts; lowering the activation energy D. inorganic catalysts; increasing the activation energy E. biological catalysts; substrate-level phosphorylation

Silicon atoms have 14 total electrons in 2-8-4 configuration. How can a silicon atom reach a full octet? A. Lose 4 electrons. B. Gain 2 electrons. C. Lose 8 electrons. D. Gain 4 electrons.

Sodium (Na) is an element in group 1 of the periodic table. Sulfur (S) is in group 16. Which option represents the ionic compound formed by sodium and sulfur? a. Na₂S b. NaS c. NaS2 d. Na₂S2

A protein has a tertiary structure formed by interactions between the side chains of the following pairs of amino acids. For each pair, identify the strongest type of interaction between these amino acids. a. Valine and isoleucine b. Asparagine and serine c. Glutamic acid and arginine d. Tryptophan and methionine

Consider an alkene: Some statements regarding the reaction of the above alkene are given below. Select the incorrect statement out of the following. A. On reaction with A/H+/KMnO4, if one of R or R' is H then HCOOH or CO₂ is obtained as a product B. On reaction with 03/H2O, if one of R or R' is H then formic acid or CO2 is produced as a product C. On reaction with 03/Zn, if R = R' then a single product is obtained D. On reaction with Na in Liq. NH3, the alkene is converted to an alkane

Potassium often loses one electron, forming a 1+ ion. If the first five ionization energies of potassium are shown as a graph, which ionization energy would show a sudden sharp increase? A. Fourth ionization energy. B. Third ionization energy. C. Second ionization energy. D. Fifth ionization energy.

Na₂CO3(aq) +CaCl₂(aq) -> 2 NaCl(aq) + CaCO3(s) Calculate the volume (in mL) of 0.200 M Na₂CO3 needed to produce 2.00 g of CaCO3(s) There is an excess of CaCl2 Molar mass of calcium carbonate = 100.09 g/mol Volume of sodium carbonate = ___ mL

Fe2O3 (molar mass = 159.7 g/mol) reacts with CO (molar mass= 28.0 g/mol) according to the equation Fe₂O3(s) + 3CO(g) → 3CO₂(g) + 2Fe(s) When 210.2 g Fe2O3 reacts with excess CO, what number of moles of Fe (iron) is produced? a. 5.265 mol Fe b. none of these c. 2.632 mol Fe d. 0.658 mol Fe e. 3.949 mol Fe

A chemistry student weighs out 0.0411 g of phosphoric acid (H₂PO4), a triprotic acid, into a 250. mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.0600M NaOH solution. Calculate the volume of NaOH Solution the student will need to add to reach the final equivalence point.

An analytical chemist weighs out 0.162 g of an unknown triprotic acid into a 250 mL volumetric flask and dilutes it to the mark with distilled water. She then titrates this solution with 0.0600 M NaOH solution. When the titration reaches the equivalence point, the chemist finds she has added 82.7 mL of NaOH solution. Calculate the molar mass of the unknown acid.

A chemistry student weighs out 0.161 g of acrylic acid (HCH₂CHCO₂) into a250. mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1900M NaOH Solution. Calculate the volume of NaOH Solution the student will need to add to reach the equivalence point.

Which of the following statement is not correct? A. Pure nitric acid is a light yellow liquid B. Nitric acid with water forms an azeotropic mixture containing 98% of acid C. Nitric acid when mixed with concentrated H₂SO4 produces nitronium ion D. Covalent nitrates are less stable than ionic nitrates

Arrange the following ions in order from smallest to largest ionic radius: As3-, Rb+, Br, Se2-, Sr2+ As3- < Rb+ < Br< Se2- <Sr2+ As3- <Se2-< Br< Rb+ < Sr2+ As3- <Sr2+ < Se2- < Br- < Rb+ Rb+ < Br< Sr2+ < Se2- <As3- Sr2+ < Rb+ < Br < Se2- < As3-

According to the Bohr model, the energy of the hydrogen atom is given by the equation: E = (-21.7 x 10-19 J)/n^2 Calculate the wavelength of the photon emitted when the atom undergoes relaxation from the first excited state to the ground state. Selected Answer: a. 9.1 x 10-8 m Correct Answer: d. 1.22 x 10-7 m

Which of the following does not describe competitive inhibition? A. Inhibitor bears structural resemblance to the substrate B. Inhibitor binds to the active site C. Inhibitor effect is reversed by increase in the substrate concentration D. Allosteric site

1-Butyne is treated with sodium hydride, followed by 1-chloropropane. The resulting product istreated with excess Cl2. What is the IUPAC nameof the final product? 3,4-tetrachloroheptane 2,2,3,3-tetrachloroheptane 3,3,4,4-tetrachloroheptane 2,3-tetrachloroheptane

The retrosynthetic arrow in the following scheme describes a reaction that would use which of the reagents below?

An analytical chemist weighs out 0.092 g of an unknown monoprotic acid into a 250 mL volumetric flask and dilutes to the mark with distilled water. He then titrates this solution with 0.0700 M NaOH solution. When the titration reaches the equivalence point, the chemist finds he has added 21.9 mL of NaOH solution. Calculate the molar mass of the unknown acid. Round your answer to 2 significant digits.

Which of the following does a real gas have that an ideal gas is assumed not to have? Choose all that apply. A. individual particle volume B. individual particle kinetic energy C. interparticle attractions D. individual particle mass

A chemist prepares a solution of potassium bromide (KBr) by measuring out 0.24 g of KBr into a 250. mL volumetric flask and filling to the mark with distilled water. Calculate the molarity of Br- anions in the chemist's solution. Be sure your answer is rounded to 2 significant digits.

A mixture of helium and xenon gases, in a 9.25 L flask at 61 °C, contains 0.321 grams of helium and 37.8 grams of xenon. The partial pressure of xenon in the flask is _____ atm and the total pressure in the flask is ____ atm.

A single-stranded protein is subjected to extreme heat. After this heat exposure, which level(s) of protein structure will be disrupted? a. Primary Only b. Secondary Only c. Tertiary Only d. Secondary & Tertiary e. Primary, Secondary & Tertiary

Ethanol has a molecular mass of 46 and a density of 0.79 g/mL. A bottle of wine has an alcohol (ethanol) concentration of 12% v/v. What is the molar concentration of ethanol in this bottle? Give your answer to 2 decimal places.

What effect do Chlorofluorcarbons (CFCs) have on the earth's ozone? A. CFC's form a chlorine radical that synthesizes the Earth's ozone. B. CFCs form a chlorine radical that decomposes the Earth's ozone. C. CFCs form oxygen gas that is good for the Earth. D. CFCS do not affect Earth's ozone

Triglycerides are composed of three fatty acids bonded to a glycerol backbone. Explore the structures and properties of triglycerides. The carbon-carbon double bonds of triglycerides will react withhydrogen gas in the presence of a metal catalyst such as Pt. This process will convert the unsaturated triglycerides to saturated triglycerides. What quantity in moles of H2 gas would be required to convert thistriglyceride to a fully saturated triglyceride?

Be sure to answer all parts. Predict the products and balance the following acid-base reactions. Include the states of matter for each reactant and product. (Be sure to enter the entire equation into each answer box.) a. HNO3(aq) + NaOH(aq) → b. H2SO4(aq) + KOH(aq) →

Calculate the Rf value if the solvent moved 14.1 cm and an ink component moved 7.2 cm.