STUDENT NAME DAY TIM LABORATORY 2: THE CHEMISTRY OF WATER END-OF-EXERCISE REVIEW
ID: 281822 • Letter: S
Question
STUDENT NAME DAY TIM LABORATORY 2: THE CHEMISTRY OF WATER END-OF-EXERCISE REVIEW MULTIPLE CHOICE: Choose the lettered option that best answers the question or completes the 1Which of the following best represents hydrogen bonding between two adjacent water molecules? -2. Hydrogen bonding: a only occurs between water molecules. b. is the strongest form of chemical bond c occurs when electrons are equally distributed d. occurs within protein and DNA molecules 3. Hydrogen bonds between water molecules are responsible for a. cohesion of water b. c. ice floating d. water's fairly stable temperatures when environmental temperatures surface tension of water. fuctuate. e all of the above Water heats up more slowly than other compounds because: a. when water is heated the energy is used to dissociate H20 into H and OH b. substances with a neutral pH heat up more slowly than acids or bases c. water is most dense at 4°C d. when water is heated the energy that would otherwise be used to speed up molecules is used to break hydrogen bonds. e. none of the above- all substances heat up equally Water molecules are NOT attracted to: a other water molecules. b. polar compounds. onic compounds. d. non-polar compounds 6. The attraction between water molecules is a. adhesion b. cohesion Laboratory 2: The Chemistry of WaterExplanation / Answer
1. The correct option is c.
The hydrogen bond is between the hydrogen of one water molecule and the oxygen of the other molecule. In this structure, the big circle representing oxygen is attracted by the small circle representing hydrogen.
2. The correct option is d. occurs within protein and DNA molecules.
The statements b and c are wrong and the statement a is wrong because hydrogen bond is present in many molecules, not only water. It is present is also present within protein and DNA molecules.
3. The correct option is e. all of the above.
Hydrogen bond changes all the properties of the water molecules mentioned in other options.
4. The correct option is d. when water is heated the energy that would otherwise be used to speed up molecules is used to break hydrogen bonds.
Due to the presence of hydrogen bonds between water molecules, the heat provided should break these hydrogen bonds first and then increase their speed which will result in the change in temperature. So, water is heated slowly due to the presence of hydrogen bonds.
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