1. Yusuf is studying catalysts. He knows that catalysts are used in the Haber process to make ammonia. What is the catalyst used in the Haber process?
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Chapter 8: Energetics
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2. David is studying thermochemical equations. He writes the equation: C(s) + O2(g) → CO2(g) ΔH = -393.5 kJ. What does the negative ΔH indicate?
3. Which statement is true for exothermic reactions?
4. Which unit is commonly used for enthalpy change?
5. What happens to surroundings in an exothermic reaction?
6. Which reaction has products with lower energy than reactants?
7. Hina is studying the products of anaerobic respiration in humans. She knows that during strenuous exercise, muscles produce lactic acid. What happens to the lactic acid?
8. Melting of ice is a:
9. Sam is studying thermochemical reactions. He knows that thermochemical equations include the enthalpy change. Which of the following is a thermochemical equation?
10. Which process is exothermic?
11. Which type of reaction absorbs heat?
12. Julia is studying exothermic reactions. She knows that neutralization reactions are exothermic. What is observed when an acid reacts with a base?
13. Heat is measured in which unit?
14. Khalid is comparing aerobic and anaerobic respiration. He knows that anaerobic respiration occurs in the absence of oxygen. What is a common product of anaerobic respiration in muscles?
15. Rachel is studying aerobic respiration. She knows that the overall reaction is: C6H12O6 + 6O2 → 6CO2 + 6H2O + energy. What is the energy released in this reaction in the form of?
16. The energy profile of an endothermic reaction shows:
17. Julia is studying respiration. She knows that aerobic respiration requires oxygen, while anaerobic respiration does not. Which type of respiration produces more energy (ATP)?
18. The peak of an energy profile diagram represents:
19. Uma is studying the enthalpy of formation. She knows that the enthalpy of formation of a compound is the heat change when one mole of compound is formed from its elements. What is the enthalpy of formation of elements in their standard state?
20. Which diagram shows energy changes during a reaction?
21. George is studying bond formation and bond dissociation. He knows that energy is released when bonds are formed and energy is absorbed when bonds are broken. What is the term for the energy required to break a bond?
22. A catalyst works by:
23. Chloe is studying the system and surroundings. She knows that in an exothermic reaction, heat flows from the system to the surroundings. What is the sign of q (heat) for the system?
24. Lara is studying catalysts. She knows that enzymes are biological catalysts. What is the role of enzymes in the body?
25. Energy absorbed during bond breaking is:
26. Activation energy is highest at:
27. Which energy change is shown by ΔH < 0?
28. Ahmed is studying the enthalpy of reaction. He determines that the reaction A → B has ΔH = +100 kJ. What type of reaction is this?
29. David is studying thermochemistry. He knows that thermochemistry is the study of heat changes in chemical reactions. What is the heat change at constant pressure called?
30. Tina is studying respiration. She knows that respiration occurs in living organisms to release energy. Which of the following is the correct word equation for aerobic respiration?