Professional Courses
Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.
Categories
Interactive Games
Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
Typing
Memory
Math
English Adventures
Knowledge
Enroll to start learning
You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the standard enthalpy of formation for oxygen gas (O₂)?
💡 Hint: Think about elements in their most stable form.
Question 2
Easy
Is the reaction of hydrogen and oxygen to form water exothermic or endothermic?
💡 Hint: Recall the sign of ΔH_f° for water.
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_f° represent?
- A measure of temperature change
- Enthalpy change for formation of a compound
- Density of a gas at standard pressure
💡 Hint: Think about what formation means in chemistry.
Question 2
Which reaction has a negative ΔH_f° value?
- True
- False
💡 Hint: Consider standard formation reactions that release heat.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Using provided ΔH_f° values, calculate the enthalpy change for forming ammonia (NH₃) from nitrogen and hydrogen.
💡 Hint: Consult the standard enthalpy chart for reference.
Question 2
Given the ΔH_f° values of H₂O(l) and CO₂(g), determine the ΔH for photosynthesis.
💡 Hint: Reverse reactions appropriately to apply Hess's Law.
Challenge and get performance evaluation