1. What is meant by the term endothermic?

Question 1 of 16

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

Question 2 of 16

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

Question 3 of 16

4. Are displacement reactions exothermic or endothermic?

Question 4 of 16

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

Question 5 of 16

6. What does the symbol ΔH mean

Question 6 of 16

7. Use Q=mcΔT and c=4.18J/°C/g. A strip of magnesium is added to a beaker with 200cm³ of copper (II) sulfate. The temperature starts at 21.7°C and rises to a maximum of 23.1°C. What is the total heat energy change?

Question 7 of 16

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

Question 8 of 16

9. What does this diagram represent?

Question 9 of 16

10. 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 10 of 16

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

Question 11 of 16

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

Question 12 of 16

13. What is meant by the term exothermic?

Question 13 of 16

14. Explain, in terms of making and breaking bonds, why a reaction could be endothermic

Question 14 of 16

15. 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 15 of 16

16. State the units of molar enthalpy change.

Question 16 of 16


 

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