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3 cards from this section. Quick, good the night before a test.
What is the formula used to calculate heat energy in calorimetry?
Think of the components involved in measuring energy, mass, and temperature change.
Is the enthalpy change (ΔH) negative for exothermic reactions?
Remember that these reactions release energy to the surroundings.
What does ΔH represent in a chemical reaction?
Think of the nature of heat change in chemical reactions.
True or False: In calorimetry, a higher temperature indicates an endothermic reaction.
Recall how temperature changes relate to heat exchange.
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?
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.
Look for the temperature decrease to help with the sign of ΔH.
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