Question detail
What is the formula used to calculate the heat energy transferred in a calorimetry experiment?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Energetics
Question
- A. q = mcΔT
- B. q = mΔT
- C. q = cΔT
- D. q = mcv
Answer
q = mcΔT
Explanation
The formula q = mcΔT is used to calculate the heat energy transferred, where q is the heat energy, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature. This is essential for measuring enthalpy changes in calorimetry.
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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