Substance
|
Initial Temperature
(Degrees Celsius)
|
Final Temperature
(Degrees Celsius)
|
Change In Temperature
(Degrees Celsius)
|
Methanol
|
21.1
|
6.5
|
-14.6
|
Ethanol
|
19.8
|
11.3
|
-8.5
|
n-Butanol
|
20.9
|
18.7
|
-2.2
|
Glycerin
|
21.3
|
24.4
|
+3.1
|
Water
|
20.7
|
16.7
|
-4.0
|
2) The substance with the largest difference in temperature was methanol. This was because methanol has the fewest places for intermolecular hydrogen bonding to occur, so it was easier to break apart and evaporate, causing the greatest temperature change.
3) Methanol and ethanol have similar molecular masses but had different evaporations. Methanol had a temperature change of -14.6 degrees Celsius and ethanol had a temperature change of -8.5 degrees Celsius. This is because methanol has fewer possible intermolecular hydrogen bonds, so it's an easier substance to break apart than ethanol, which has more places for possible intermolecular hydrogen bonds to occur.
4) All of the compounds in these substances are formed through hydrogen bonds and these specific molecules bond together through bonds between oxygen and hydrogen atoms. Therefore, the more oxygen and hydrogen atoms a molecule of these substances has, the less likely one of these substances is to break apart. For example, methanol has the fewest number of hydrogen and oxygen atoms and n-Butanol has the most, which corresponds to the fact that methanol evaporated the fastest and n-Butanol the slowest.
3) Methanol and ethanol have similar molecular masses but had different evaporations. Methanol had a temperature change of -14.6 degrees Celsius and ethanol had a temperature change of -8.5 degrees Celsius. This is because methanol has fewer possible intermolecular hydrogen bonds, so it's an easier substance to break apart than ethanol, which has more places for possible intermolecular hydrogen bonds to occur.
4) All of the compounds in these substances are formed through hydrogen bonds and these specific molecules bond together through bonds between oxygen and hydrogen atoms. Therefore, the more oxygen and hydrogen atoms a molecule of these substances has, the less likely one of these substances is to break apart. For example, methanol has the fewest number of hydrogen and oxygen atoms and n-Butanol has the most, which corresponds to the fact that methanol evaporated the fastest and n-Butanol the slowest.
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