Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the formula used to calculate heat energy in calorimetry?
💡 Hint: Think of the components involved in measuring energy, mass, and temperature change.
Question 2
Easy
Is the enthalpy change (ΔH) negative for exothermic reactions?
💡 Hint: Remember that these reactions release energy to the surroundings.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What does ΔH represent in a chemical reaction?
- Heat released
- Heat absorbed
- Both A and B depending on the reaction
💡 Hint: Think of the nature of heat change in chemical reactions.
Question 2
True or False: In calorimetry, a higher temperature indicates an endothermic reaction.
- True
- False
💡 Hint: Recall how temperature changes relate to heat exchange.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
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.
Question 2
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.
Challenge and get performance evaluation