What were the learning goals of this lab experiment? Check all that apply.to use mass and temperature data to do computations involving heatto demonstrate that different reactions have different enthalpiesto compute a reaction’s enthalpy directly using mass measurements and a calorimeterto compute the enthalpy of a reaction that cannot be measured directly using a simple calorimeter
To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.
In both Reactions 1 and 2, the temperature change was , meaning that the reactions heat.
In both Reactions 1 and 2, the temperature change was , meaning that the reactions heat.
To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.
The enthalpy of the magnesium combustion is kJ/mol.
Suppose that during the experiment, a student forgot to put the lid on the calorimeter. What is the most likely error and reason?Temperature readings will be too high because heat will be absorbed by the air.Temperature readings will be too high because the lidless coffee cups will give off heat.Temperature readings will be too low because heat will be absorbed by the air.The temperature readings will be too low because the lidless coffee cup will absorb more heat.
The actual enthalpy of the magnesium flare reaction is –603 kJ/mol. Your experimental value was likely different. Check all that apply.The coffee cup calorimeter may have absorbed some heat.The plastic coffee cup lid may have allowed some heat to escape.The thermometer did not measure the temperature of the solution properly.Reading the maximum temperature values from the thermometer could be challenging.
Many fuels, such as gasoline and diesel fuel, are hydrocarbons. Hydrocarbons are molecules that contain only hydrogen and carbon. Choose all of the criteria below that would make a hydrocarbon a good fuel in terms of enthalpy. Hydrocarbons burn to absorb a large amount of energy.Burning hydrocarbons produces a lot of energy.Breaking carbon-hydrogen and carbon-carbon bonds gives off energy.The enthalpy of combustion is a large negative value.
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Magnesium combustion heat.
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 .
If you reverse Reaction 2 and combine the reactions, which substances do not cancel? Check all that apply. 2
The enthalpy of an icepack is because the reaction .
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