1) The solution process was endothermic because there was no negative side meaning it absorbed heat rather than gave off heat.
2) The possible source of percent error could have been an error in measurement with the thermometer.
3a) The moles of solute would remain the same as for the q value and delta H value, they would both increase which would cause the liquid state of the solute to become greater.
3b) If you added less chemical, the moles of solute would be lower in number along with the q value. The delta H should remain the same.
3c) Your delta H and q value would increase, the number of moles would remain the same.
Enrichment!
The mist being sprayed on the trees is freezing instead of the oranges, they do this because it helps prevent the oranges from eventually freezing up and dying off.
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