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    Chemistry worksheet
    Topic: Organic Compounds

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    Organic Compounds
    1

    Which element has atoms that can bond to each other in rings and networks?

    (1) aluminum

    (2) carbon

    (3) hydrogen

    (4) oxygen

    2

    Given the formulas of four organic compounds:

    organic-chemistry, organic-compounds, organic-chemistry, organic-compounds, moles-and-stoichiometry, formulas, moles-and-stoichiometry, compounds fig: chem12013-exam_g11.png

    Which compounds have the same molecular formula?

    (1) A and B

    (2) A and C

    (3) D and B

    (4) D and C

    3

    Which formula represents an organic compound?

    (1) CaH2

    (2) C4H8

    (3) H2O2

    (4) P2O5

    4

    Which condensed structural formula represents an unsaturated compound?

    (1) CH3CHCHCH3

    (2) CH3CH2CH3

    (3) CH3CH3

    (4) CH4

    5

    Which element is present in all organic compounds?

    (1) nitrogen

    (2) oxygen

    (3) carbon

    (4) sulfur

    6

    Given the formula for a compound:

    moles-and-stoichiometry, formulas, organic-chemistry, organic-compounds, moles-and-stoichiometry, compounds fig: chem12016-exam_g5.png

    A chemical name for this compound is

    (1) butanal

    (2) butanol

    (3) butanone

    (4) butanoic acid

    7

    Which formula represents an alkane?

    (1) C2H2

    (2) C2H4

    (3) C3H4

    (4) C3H8

    8

    Given the formula representing a compound:

    organic-chemistry, organic-compounds, moles-and-stoichiometry, formulas, moles-and-stoichiometry, compounds fig: chem12017-exam_g9.png

    What is the IUPAC name of this compound?

    (1) 2-chloroheptane

    (2) 6-chloroheptane

    (3) 2,2-dichloroheptane

    (4) 6,6-dichloroheptane

    9

    Which formula represents an alkyne?

    (1) CnHn

    (2) C2nHn

    (3) CnH2n + 2

    (4) CnH2n– 2

    10

    Which compounds are isomers of each other?

    (1) methanol and methanal

    (2) propanoic acid and pentanoic acid

    (3) 1-propanol and 2-propanol

    (4) 1-chloropropane and 2-bromopropane

    Base your answers to questions 11 on the information below.

    Two hydrocarbons that are isomers of each other are represented by the structural formulas and molecular formulas below.

    chemical-bonding, chemical-bonds, organic-chemistry, hydrocarbons, organic-chemistry, hydrocarbons fig: chem12012-exam_g15.png

    11

    Explain, in terms of structural formulas and molecular formulas, why these hydrocarbons are isomers of each other.

    Allow 1 credit. Acceptable responses include, but are not limited to:

    • The molecular formulas of the two hydrocarbons are the same, but the structural formulas are different.

    Base your answers to questions 12 on the information below.

    The active ingredient in the pain reliever aspirin is acetylsalicylic acid. This compound can be produced by reacting salicylic acid with acetic acid. The label of one aspirin bottle indicates that the accepted mass of acetylsalicylic acid in each tablet is 325 milligrams.

    In a laboratory, an aspirin tablet is crushed and mixed with water to dissolve all of the acetylsalicylic acid. The measured pH of the resulting solution is 3.0.

    12

    Write the chemical formula for the acetic acid.

    Allow 1 credit. Acceptable responses include, but are not limited to:

    • HC2H3O2(aq)

    • CH3COOH

    Base your answers to questions 13 on the information below and on your knowledge of chemistry.

    Table sugar, sucrose, is a combination of two simple sugars, glucose and fructose. The formulas below represent these simple sugars.

    organic-chemistry, functional-groups-and-types-of-organic-compounds fig: chem12014-exam_g10.png

    13

    Explain, in terms of atoms and molecular structure, why glucose and fructose are isomers of each other.

    Allow 1 credit. Acceptable responses include, but are not limited to:

    • The number of each kind of atom is the same in both, but their structures are not the same.

    • Their molecular formulas are the same, but their structural arrangement of atoms is different.

    • same molecular formula but different structural formulas

    • The only difference is the arrangement of the atoms.

    Base your answers to questions 14 on the information below and on your knowledge of chemistry.

    Rubbing alcohol is a product available at most pharmacies and supermarkets. One rubbing alcohol solution contains 2-propanol and water. The boiling point of 2-propanol is 82.3°C at standard pressure.

    14

    Draw a structural formula for the 2-propanol.

    Allow 1 credit.

    • Examples of 1-credit responses:

    • chem12014-rg_g2.png

    Base your answers to questions 15 on the information below and on your knowledge of chemistry.

    The diagrams below represent ball-and-stick models of two molecules. In a ball-and-stick model, each ball represents an atom, and the sticks between balls represent chemical bonds.

    chemical-bonding, electron-dot-diagrams-(lewis-structures), atomic-concepts, valence-electrons, chemical-bonding, electron-dot-diagrams-(lewis-structures) fig: chem12015-exam_g17.png

    15

    Explain why the molecules in diagrams A and B are isomers of each other.

    Allow 1 credit. Acceptable responses include, but are not limited to:

    • Both molecules have the same molecular formula, but have different structural formulas.

    • Both molecules are composed of 5 carbon atoms and 12 hydrogen atoms, but differ in the arrangement of their atoms.