Lab: Enthalpy

Question 1

What were the learning goals of this lab experiment? Check all that apply.

Revolt · Accepted Answer

to use mass and temperature data to do computations involving heat; to compute a reaction’s enthalpy directly using mass measurements and a calorimeter; to compute the enthalpy of a reaction that cannot be measured directly using a simple calorimeter

Question 2

’s law allows you to find the net enthalpy of the magnesium combustion by adding the enthalpies of intermediate reactions.

Revolt · Accepted Answer

Hess

Question 3

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

Revolt · Accepted Answer

mass; Selection 1: mass; Selection 2: temperature

Question 4

and the change during the reaction.

Revolt · Accepted Answer

temperature

Question 5

In both Reactions 1 and 2, the temperature change was , meaning that the reactions heat.

Revolt · Accepted Answer

positive; Selection 1: positive; Selection 2: gave off

Question 6

reactions heat.

Revolt · Accepted Answer

gave off

Question 7

Reaction(s) released heat.

Revolt · Accepted Answer

1, 2, and 3; Selection 1: 1, 2, and 3

Question 8

Instant hot and cold packs are found in many common stores and work when two substances react. Depending on the substances that react, the reaction either absorbs heat or gives off heat.The enthalpy of a hot pack is because the reaction .

Revolt · Accepted Answer

negative; Selection 1: negative; Selection 2: gives off heat

Question 9

Reaction released the most heat per mole of reactant.

Revolt · Accepted Answer

3

Question 10

because the reaction .

Revolt · Accepted Answer

gives off heat

Lab: Enthalpy Answers

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