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A comprehensive set of questions and answers for chemistry 210 exams 1-8 and the final exam. It covers a wide range of topics, including the properties of carbon, functional groups, biomolecules, and cell structure. Valuable for students preparing for exams in general chemistry or introductory organic chemistry.
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Question 1 3 / 3 pts True or False: According to the Module, a compound with a molecular mass of 1,000 g/mol is considered a macromolecule.
True Correct! False Question 2 3 / 3 pts True or False: Biomolecules can have only two functional groups. True Correct! False Question 3 3 / 3 pts True or False: The following functional group is an alcohol.
True Correct! False
Question 4 3 / 3 pts True or False: digesting macromolecules. In a eukaryotic cell, the organelles called peroxisomes serve the purpose of
True Correct! False Question 5 3 / 3 pts True or False: Carbon dioxide has a linear molecular shape AND has a bond angle of 109.5o. True Correct! False Question 6 3 / 3 pts Of the following, is not a property of carbon. forming covalent bonds triple bond formation Correct! possessing five valence electrons reacting to form long chains called polymers forming multiple bonds Question 7 3 / 3 pts Which of the following is an element not typically found in living organisms? N Correct! He H S O
You Answered Covalent formula Line bond formula Empirical formula Kekule’ structureCorrect Answer
Condensed formula Question 11 3 / 3 pts A collection of two or more macromolecules uniting is called a.
Correct! Supramolecular complex Monomer Macromolecular structure Dimer Kekule’ complex Question 12 3 / 3 pts An organic compound with this structure, C=C, contains a functional group. AlkaneCorrect!
Alkene Alkyne Alcohol Both b and d
Question 13 3 / 3 pts Scientists refer tochemistry. Correct! as the “super glue” of the
C Co Na N O Question 14 3 / 3 pts What molecule is most important for energy storage in cells? Creatine mitochondria DNA RNA Correct! ATP Question 15 3 / 3 pts What would be the approximate size of a human cell? a. 12 μ m
b. 1 nm c. 15 nm d. 0.2 inche. 15 cm
Correct! a.
Radon Routine carbon atom Correct! Rest of the molecule None of the above Question 19 3 / 3 pts According to the module, the study of NON-carbon compounds is referred.
Organic chemistry Correct! Inorganic chemistry Biochemistry Environmental chemistry None of the above. Question 20 3 / 3 pts Which of the following is not a functional group discussed in this module? Alcohol Amine Ketone Aldehyde Correct! All of these were discussed. Question 21 3 / 3 pts Which number would be closest to the approximate number of ribosomes in an E. coli cell?
Correct! D. 25, E. Both c and d Question 22 0 / 3 ptsWhich of the following would most likely have a cell wall? Correct Answer Marigold flower cells Deer cells Heart cells Human red blood cellsYou Answered
All of the above Question 230 / 3 pts
Eukaryotes have molecules that provide protective structural. This network is called the .
Cell wall You Answered Cytoplasm Cytosol Correct Answer Cytoskeleton
The fundamental similarity is that each cell type has a plasma membrane that separates life from non-life. The plasma membrane acts as a barrier to most molecules but does have proteins that permit select molecules to cross via proteins (transporters). The plasma membrane permits the cell to have a different composition of molecules inside the cell thanout and defines a space for life to occur.
Develop the membrane response further, based on module material. Question 27 2.5 / 5 pts(Short response) Would scientists be more likely to find an element such as O in a biomolecule, or W? Explain which she would more likely find in biological molecule and give specific physical/chemical properties. Your Answer: Scientists would be more likely to find an element of O in a biomolecule because O is a bulkelement while W is a trace element. O is found is most strcutures and functional groups.
She would more likely find O. Smaller elements are preferred. In the case of O, it is found in water, so it would be highly concentrated. Smaller elements with smaller atomic shells are favored because they can form stable covalent bonds. Strong bonds form by significant overlap of atoms, such as carbon and hydrogen permitting them to share electrons. Thebond that forms requires a substantial amount of energy to break, which allows the bonds to withstand insults, such as mechanical and thermal stresses. This bond strength is good news for living organisms. Stable bonds allow cells to form, hair to grow, and skin to protect against abrasion.
Larger elements, such as W, tend to form ionic compounds–not covalent. Describe why O is using the size/overlap. Question 28 3.5 / 5 pts(Short response) What element is the basis for life? Describe at least two properties of this element that permit it to serve the basis for life. Your Answer: Carbon is the element that is the basis for life. Carbon has the ability to form stable covalent bonds and unique combinations. Carbon has its own branch organic chemistry.
1. Carbon can form strong covalent bonds with a variety of different elements. 2. Besides, carbon can form double and triple bonds with other carbon atoms and other elements (N and o). 3. Carbon can form long chains by forming numerous carbon- carbon bonds; we
call these large molecules polymer. 4. Lastly, carbon can form cyclic structures, which are also called ring compounds. Give one more property of carbon. Question 29 4 / 5 pts (Short response) How does organic chemistry differ from inorganic chemistry? Your Answer: Organic chemistry is focues on the chemical and physical properties of carbon and inorganicchemistry focues on non organic compounds.
Organic chemistry is the study of the carbon-based compounds. Inorganic chemistry is the study of all other elements, but carbon. There is no need to have separate sub-disciples for organic and inorganic chemistry, but for historical and organizational reasons the difference exists. Include the non-carbon elements in your defintion of inorganic. Question 30 0 / 5 pts (Short response) Biochemists study the communication within and among organisms. Accordingto the module, what are two other aspects of living organisms that biochemists study? Your Answer: Bichemists study carbs and proteins in living organism along with chemistry and biology. Also luciferin i studies and luciferase. In the module, biochemists also study the structure and function of biomolecules and thechemical reactions of organisms.
Be more specific here. This is related to the homework problems and module material.
Question 1 3 / 3 pts The pH of a solution of 0.0010 M NaOH is:
1 Correct! 11
Question 4 0 / 3 pts Which diagrams correctly represent a hydrogen bond?
Correct Answer A and D A and C You Answered B and C C and D B and D Question 5 0 / 3 pts The H +^ concentration of a solution is 1.2 x 10-3^ M. What is the pH? -1.
You Answered
-2.
Correct Answer
Question 6 3 / 3 pts If the K (^) a of an acid is 5.63 x 10-3, what is the pK (^) a? 6.86Correct!
[pKa = -log(5.63 x 10-3) = 2.25]
Question 7 3 / 3 pts List the acids in DECREASING order of strength (strongest to weakest): Nitrous acid (K (^) a = 4.0 x 10-4); acetic acid (K (^) a = 1.7 x 10-5); phosphoric acid (K (^) a = 7.3 x 10-3)
Nitrous acid, acetic acid, phosphoric acid Acetic acid, nitrous acid, phosphoric acid Correct! Phosphoric acid, nitrous acid, acetic acid Acetic acid, phosphoric acid, nitrous acid None of the above Question 8 0 / 3 pts Elemental iodine (I (^) 2) is a solid at room temperature. What is the dominant attractive force that exists between I 2 molecules in the solid? Correct Answer
Cl P Correct! N Question 11 3 / 3 pts In a bond between P and Cl, there exists a difference in electronegativity resulting in partial positive and partial negative charges. If a dipole arrow where added to this structure, which way would the arrow point?
The arrow points from Br toward NCorrect!
The arrow points from N toward Br Two arrows; one pointed in each direction There would not be a dipole arrow in this case. None of the above Question 12 3 / 3 pts The following reaction occurs in glues purchased from hardware stores. Customers use this product to glue plastic together.
Epoxy (l) + hardener (l) ⟶ Glue (s) + heat given off
What is the sign (+ or -) of the change in Δ G and Δ H?
A) Δ G is (+) and Δ H is (-)
B) Δ G is (-) and Δ H is (-)
C) Δ G is (-) and Δ H is (+)
D) Δ G is (+) and Δ H is (+)
E) None of the above
A Correct! B C D E Question 13 3 / 3 pts Which of the following is the free-energy change of a reaction? A) Δ G
B) Δ S
Question 15 3 / 3 pts
Correct! A B C D E Question 163 / 3 pts
Which buffer system is used by the renal system to maintain pH balance?
Phosphate buffer system
Acetic acid buffer system Water buffers system Formic acid buffer system Correct! Bicarbonate buffer system Question 17 3 / 3 pts A buffer can neutralize acid and base within a certain limit. We say that this is its:
Buffer limit Correct! Buffer capacity Buffer range Buffer maintenance Buffer arena Question 18 3 / 3 pts Is a pH of 8.36 acidic, neutral, or basic? Acidic Neutral Correct! Basic Both Acidic and Basic Both Neutral and Basic Question 19 3 / 3 pts The “ion product” is equal to what value?
