4.1.7 - Measurement of Enthalpy Changes (Calorimetry)
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Practice Questions
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What is the formula used to calculate heat energy in calorimetry?
💡 Hint: Think of the components involved in measuring energy, mass, and temperature change.
Is the enthalpy change (ΔH) negative for exothermic reactions?
💡 Hint: Remember that these reactions release energy to the surroundings.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does ΔH represent in a chemical reaction?
💡 Hint: Think of the nature of heat change in chemical reactions.
True or False: In calorimetry, a higher temperature indicates an endothermic reaction.
💡 Hint: Recall how temperature changes relate to heat exchange.
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Challenge Problems
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A calorimeter absorbs 500 J of heat while dissolving a salt in 150 g of water. Calculate the molar enthalpy change if the molar mass of the salt is 58.5 g/mol. What does the sign of ΔH indicate?
💡 Hint: Consider how to convert grams to moles using molar mass.
You conduct an experiment where 100 g of water (specific heat 4.18 J/g°C) cools from 100°C to 25°C after a reaction. Calculate the total heat released, and determine if the reaction is exothermic or endothermic.
💡 Hint: Look for the temperature decrease to help with the sign of ΔH.
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