Chemistry Solubility Quiz
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Questions and Answers

What can be inferred about the saturation level of the compound if the colour remains brown when bromine (Br2) is added?

  • The compound no longer contains any bromine after the reaction.
  • The compound is saturated and does not react with Br2. (correct)
  • The compound is unsaturated and reacts with Br2.
  • The compound contains at least one double bond.
  • Which of the following represents a possible molecular structure with a degree of unsaturation?

  • Propane (C3H8)
  • Cyclohexane (C6H12)
  • But-1-ene (C4H8) (correct)
  • Hexane (C6H14)
  • In the context of buta-1,3-diene, how is the theoretical mass of fluorine needed for saturation calculated?

  • By using the molar ratio between buta-1,3-diene and fluorine in the balanced equation. (correct)
  • By finding the density of buta-1,3-diene.
  • By directly weighing the amount of fluorine gas used.
  • By measuring the volume of buta-1,3-diene in milliliters.
  • Which of the following statements accurately describes buta-1,3-diene?

    <p>It contains multiple points of unsaturation.</p> Signup and view all the answers

    What is the product of the reaction when fluorine gas is added to buta-1,3-diene until the molecule is fully saturated?

    <p>Butane is formed as the saturated product.</p> Signup and view all the answers

    What does the degree of unsaturation represent in a hydrocarbon?

    <p>The amount of C = C bonds present in the hydrocarbon.</p> Signup and view all the answers

    How is the degree of unsaturation calculated based on the information given?

    <p>By finding the integer ratio of specific amounts.</p> Signup and view all the answers

    In an experiment, 0.0250 mol of a hydrocarbon is tested using iodine. What does the brown color remaining indicate?

    <p>All the iodine has reacted completely.</p> Signup and view all the answers

    What is the significance of the amount of iodine added in the testing of the hydrocarbon?

    <p>It indicates the number of double bonds present in the hydrocarbon.</p> Signup and view all the answers

    When calculating the degree of unsaturation, why is the ratio of 0.0568:0.1703 significant?

    <p>It helps derive the integer ratio for determining unsaturation.</p> Signup and view all the answers

    Which substance is classified as insoluble in water based on the provided information?

    <p>Pentane</p> Signup and view all the answers

    Which color of water indicates the presence of ethanal when mixed with water and bromothymol blue indicator?

    <p>Blue</p> Signup and view all the answers

    Identify the substance that is soluble in water and causes a yellow color when mixed with bromothymol blue.

    <p>Ethanoic acid</p> Signup and view all the answers

    Which of the following substances was mixed in a solution that resulted in green coloration?

    <p>Propanamide</p> Signup and view all the answers

    What is the solubility of octan-1-ol in water based on the given information?

    <p>Soluble</p> Signup and view all the answers

    Which of the following substances is most likely to produce a yellow color in a water mixture with the thymol blue indicator?

    <p>Propan-1-amine</p> Signup and view all the answers

    What color does water turn when ethanoic acid is added to it with bromothymol blue?

    <p>Yellow</p> Signup and view all the answers

    Which vessel's substance is expected to be soluble and turn yellow upon mixing with water?

    <p>Vessel B - Ethanoic acid</p> Signup and view all the answers

    Which types of alcohol can undergo oxidation?

    <p>Primary and Secondary Alcohols only</p> Signup and view all the answers

    What happens to the color of ethanol when acidified permanganate is added?

    <p>Remains Colorless</p> Signup and view all the answers

    What is the color observed after adding acidified dichromate to a solution containing propan-2-ol?

    <p>Orange</p> Signup and view all the answers

    Which of the following combinations can lead to a green color after adding acidified dichromate?

    <p>Octan-2-one</p> Signup and view all the answers

    What distinguishes octan-1-ol in terms of solubility when placed in acidified dichromate?

    <p>It is soluble and turns orange</p> Signup and view all the answers

    What is the degree of unsaturation for a hydrocarbon with 5 carbons?

    <p>3</p> Signup and view all the answers

    What is the IUPAC name for the hydrocarbon described as a potential isomer with the formula C5H8?

    <p>penta-1,3-diene</p> Signup and view all the answers

    Which of the following statements is true regarding the reaction between the hydrocarbon and hydrogen chlorine gas?

    <p>The reaction results in an alkyl chloride.</p> Signup and view all the answers

    How would you calculate the iodine number for the molecule C4H6?

    <p>By measuring the mass of iodine used in the reaction.</p> Signup and view all the answers

    Which formula correctly represents the structural formula of the hydrocarbon that is 5 carbons long and has two double bonds?

    <p>C5H8</p> Signup and view all the answers

    What characteristic does not apply to alkenes formed from the addition of HCl to hydrocarbons?

    <p>Unsaturation less than that of the hydrocarbon.</p> Signup and view all the answers

    What might indicate that a hydrocarbon is likely to have multiple double bonds?

    <p>Degree of unsaturation higher than 1.</p> Signup and view all the answers

    Why is penta-1,3-diene considered a potential structural formula for a 5-carbon compound?

    <p>It has multiple double bonds in the structure.</p> Signup and view all the answers

    Study Notes

    Solubility and Color Indications for Various Compounds

    • Solubility in water serves as a quick testing method to identify compounds; ethanoic acid and ethanamine are soluble, while pentane is insoluble.
    • The color change of the water indicates the presence of specific compounds: red for ethanoic acid, yellow for ethanamine and yellow for pentane.
    • Ethanal and octan-1-ol are both soluble in water, changing the color to blue and yellow, respectively, while octan-1-ol is characterized as insoluble.

    Chemical Tests and Degree of Unsaturation

    • The reaction with bromine (Br2) indicates saturation; persistent brown color suggests the presence of a saturated compound.
    • Degree of unsaturation can be determined through the number of carbon-carbon double bonds present in a molecule.
    • Buta-1,3-diene (C4H6) can be fully saturated by adding fluorine gas.

    Analysis of Hydrocarbons

    • When testing with iodine (I2), the persistence of brown color after addition signifies the degree of unsaturation; 19.0 g of I2 was added to an unknown hydrocarbon, indicating the nature of its bonds.
    • Degree of unsaturation calculation is essential for understanding the molecular structure of unknown hydrocarbons based on iodine or hydrogen chloride reactions.

    Oxidation Behavior of Alcohols

    • Primary and secondary alcohols can undergo oxidation while tertiary alcohols cannot.
    • When acidified permanganate is added to ethanol, the solution remains colorless; however, ethanoic acid's color changes to purple, indicating a reaction.

    Identification of Alcohols and Ketones

    • In mixed solutions with acidified dichromate, color changes reflect the oxidation status of compounds.
    • Propan-2-ol, a secondary alcohol, will show different reactivity compared to 2-methylpropan-2-ol, and the colors observed (green for oxidation) help identify each substance in test tubes A-D.
    • The solubility and color reactions provide critical information for identifying compounds in a lab setting.

    Summary of Chemical Behaviors

    • The color of the solution post-reaction provides insights into the presence of functional groups and can be utilized to differentiate between similar compounds in testing scenarios.
    • Understanding the conditions under which compounds react lays the foundation for further chemical analysis and identification.

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    Description

    Test your knowledge on the solubility of various substances in water. This quiz covers ethanoic acid, ethanamine, and pentane, examining their colors when dissolved and their solubility status. Assess your understanding of these key concepts in chemistry.

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