Question detail
Describe the procedure for measuring the enthalpy change of a reaction in a calorimetry experiment.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Energetics
Question
Describe the procedure for measuring the enthalpy change of a reaction in a calorimetry experiment.
Answer
To measure the enthalpy change, first, prepare a calorimeter with a known volume of water. Add a measured amount of reactants to the calorimeter and record the initial temperature. Allow the reaction to proceed and measure the final temperature. Calculate the temperature change (ΔT) and use the formula q = mcΔT, where m is the mass of water and c is the specific heat capacity of water, to find the heat energy transferred.
Explanation
This answer is strong because it outlines the key steps in a calorimetry experiment, which is essential for measuring enthalpy changes. It tests the understanding of practical procedures in thermochemistry.
Common mistake
Incorrect Use of q = mcΔT
Students often forget to convert the mass to kilograms when using the formula q = mcΔT, leading to incorrect calculations of heat energy transferred.
To fix this, remember to convert the mass from grams to kilograms before substituting it into the formula. For example, if you have 200 g of water, convert it to kg: 200 g = 0.2 kg. Then use the formula: q = mcΔT, where m = 0.2 kg, c = 4.18 J/g°C (or 4180 J/kg°C), and ΔT is the temperature change.
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