1. In a calorimetry experiment to investigate the heat energy released by the combustion of ethanol, why should the water in the calorimeter be stirred?

Question 1 of 16

2. Is breaking bonds exothermic or endothermic?

Question 2 of 16

3. What does the symbol ΔH mean

Question 3 of 16

4. In a chemical reaction, the overall molar enthalpy is -87 kJ/mol. Is this reaction exothermic or endothermic?

Question 4 of 16

5. What is meant by the term exothermic?

Question 5 of 16

6. In a chemical reaction, the overall molar enthalpy is +87 kJ/mol. Is this reaction exothermic or endothermic?

Question 6 of 16

7. Use Q=mcΔT and c=4.18J/°C/g. A spatula of sodium fluoride is put into a boiling tube with 25cm³ of water. The temperature drops from 22.0°C to 18.6°C. What is the total heat energy change?

Question 7 of 16

8. Use Q=mcΔT and c=4.18J/°C/g. 25cm³ of sulfuric acid is put into a boiling tube. The starting temperature is 21°C. A spatula of iron filings is added. After a while the temperature reaches 33°C. What is the total heat energy change?

Question 8 of 16

9. In an endothermic reaction, which is greater: the energy taken in when breaking bonds or the energy released when bonds are made?

Question 9 of 16

10. When a solid dissolves, is this process exothermic or endothermic?

Question 10 of 16

11. What does this diagram represent?

Question 11 of 16

12. State the units of molar enthalpy change.

Question 12 of 16

13. In a combustion calorimetry experiment, 0.78g of ethanol (C₂H₅OH) produced 12,540 J of heat energy. Calculate the molar enthalpy change.

Question 13 of 16

14. Are displacement reactions exothermic or endothermic?

Question 14 of 16

15. Explain why experimental values of enthalpy change differ from theoretical values

Question 15 of 16

16. What is meant by the term endothermic?

Question 16 of 16


 

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