Alcani - Evaluare

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| By Danca
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Danca
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1. Alcanii nu sunt solubili în apă, dar sunt solubili în solvenţi nepolari.

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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3. 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:

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

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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5. 2-metilbutanul 

Explanation

FELICITĂRI!

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Alcanii nu sunt solubili în apă, dar sunt solubili în...
Realizaţi corespondenţa
Flacăra unui bec de gaz ajunge la temperatură maximă când...
Alcanul cu 20 atomi se numeşte ..............
2-metilbutanul 
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