1. One of the main advantages of Hydrogen as a fuel is that: A) plants can econo
ID: 1006248 • Letter: 1
Question
1. One of the main advantages of Hydrogen as a fuel is that:
A) plants can economically produce the hydrogen needed
B) it exists as a free gas
C) it can be economically supplied by the world's ocean
D) the only product of hydrogen combustion is water
E) it contains a large amount of energy per unit volume of hydrogen gas
2. Consider two organic molecules, ethanol and benzene. One dissolves in water and the other does not. Why?
A) one is an electrolyte, the other is not
B) they have different molar mass
C) one is ionic, the other is not
D) ethanol contains a polar O-H bond, and benzene does not
3. Heat is:
A) a measure of thermal energy transferred between two bodies at a different temperature
B) a measure of temperature
C) a measure of the change in temperature
D) a measure of thermal energy
Explanation / Answer
1) One of the main advantages of Hydrogen as a fuel is that the only product of combustion of Hydrigen is water and hence it is environment friendly and do not cause pollution.
Combustion reaction of H2 in H2 fuel is,
2 H2 (g) + O2 (g) ------------> 2 H2O (g)
Answer option-D)
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2)
"Like dissolves like" is the basic principle and it means that polar compound will be dissolved in polar solvent and non-polar in non-polar solvent.
Ethanol is having polar O-H bond which give overall polarity to Ethanol molecule H3C-CH2-O-H and hence it dissolve in a highly polar solvent water H-OH.One more much important factor is the capability of H-bonding between H-OH (water) and H-O-Et (ethanol) molecule.
benzene on the other hand is non-polar compound and hence does not dissolve iin water.
Answer option-D) Ethanol contain polar -O-H bond and benzene does not.
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3) heat is a measure of thermal energy transfered between two bodies at a different temperatures.
Note: Heat is not a measure of temperature or change in temperature directly.
And also not a measure of thermal energy as it is just the energy transfferable from one species at higher temperature to the one at lower temperature.
Answer option - A).
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