As a lab technician for a pharmaceutical company, you are responsible for prepar

Question

As a lab technician for a pharmaceutical company, you are responsible for preparing hot packs and cold packs. A hot pack involves the release of heat when a salt and water are mixed. A cold pack becomes colder because mixing a salt and water absorbs heat. Which compound could you use to make a hot pack? Which compound could you use to make a cold pack? When you burn a log in the fireplace or burn gasoline in a car, is the reaction (combustion) an endothermic or exothermic reaction? Rates of Reaction Amount of reactants How does the amount of reactant account for the differences in the rate of reaction?

Explanation / Answer

Q1

a)

hot pack --> must increase Temperature in order to heat the user

then

we require an EXOthermic reaction, that is HRxn = negative

b)

for a col pack; we need the pack to absorb heat from user, this is achieved with an ENDOTHERMIC reaction, that is

it requires energy; then Hrxn = positive

Q2)

combustion is known to be EXOthermic, since heat is released!

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