Post-Lab Questions: (Blog Questions)
1.) Was
your solution process endothermic or exothermic? Describe the process
using terms such as: direction of heat flow, system, and surroundings of
the system.
2.) What
are the possible sources of error that cause a difference in the value
that you got, and the value that was published on the reference tables
(table I)? (Human or calculation error are not acceptable.)
3.) How would your numbers for q, moles of solute, and ultimately ∆H (q/mole), be affected if…
a.) The room temperature was 10oC colder. Explain.
b.) You added less chemical, but knew the mass you added. Explain.
c.) You added 40 mL of water but thought you had added 50 mL. Explain.
Enrichment: (1 pt)
In
Florida, when the weather report is calling for freezing temperatures,
orange farmers will mist the fruit trees with water overnight in order
to prevent damage to the tree and fruit. The water being sprayed on the
tree freezes, but as it does so, this protects the tree from damage.
Explain why this works.
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