Alcani - Evaluare

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| By Danca
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Danca
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Alcani - Evaluare - Quiz

Questions and Answers
  • 1. 

    Flacăra unui bec de gaz ajunge la temperatură maximă când arderea metanului este completă. Masa de apă, sub formă de vapori, care rezultă din 0,025 moli metan este:

    • A.

      A) 0,45 g

    • B.

      B) 0,9 g

    • C.

      C) 1,2 g

    • D.

      D) 0,8 g

    Correct Answer
    B. B) 0,9 g
    Explanation
    The question states that the maximum temperature of a gas flame is reached when the combustion of methane is complete. The question then asks for the mass of water vapor that is produced from 0.025 moles of methane. To find the mass of water vapor, we need to calculate the molar mass of water and use the mole ratio between methane and water vapor. The molar mass of water is 18 g/mol. The mole ratio between methane and water vapor is 1:1. Therefore, the mass of water vapor produced from 0.025 moles of methane is 0.025 moles * 18 g/mol = 0.45 g. Hence, the correct answer is b) 0.9 g.

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  • 2. 

    2-metilbutanul 

    • A.

      A) are în molecula sa 4 atomi de carbon

    • B.

      B) are în molecula sa 3 atomi de carbon primari

    • C.

      C) prezintă catenă saturată

    • D.

      D) prezintă catenă ramificată

    • E.

      E) prezintă catenă liniară

    • F.

      F) este izomer cu n-butanul

    Correct Answer(s)
    B. B) are în molecula sa 3 atomi de carbon primari
    C. C) prezintă catenă saturată
    D. D) prezintă catenă ramificată
    Explanation
    FELICITĂRI!

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  • 3. 

    Alcanii nu sunt solubili în apă, dar sunt solubili în solvenţi nepolari.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Alcanii nu sunt solubili în apă deoarece sunt compuși nepolari, iar apa este un solvent polar. Cu toate acestea, alcanii sunt solubili în solvenți nepolari, deoarece au o structură moleculară nepolară și interacționează bine cu alte molecule nepolare.

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  • 4. 

    Alcanul cu 20 atomi se numeşte ..............

    Correct Answer
    hexan
    Explanation
    The correct answer is "hexan" because "hexan" is the name of the alkane with 20 atoms. The prefix "hex-" indicates that it has 6 carbon atoms, and the suffix "-an" indicates that it is a saturated hydrocarbon with only single bonds. Therefore, "hexan" is the appropriate name for an alkane with 20 atoms.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Aug 21, 2012
    Quiz Created by
    Danca
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