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- 1. Multiple Choice
Enthalpy changes of reactions, AH
is the heat energy released or absorbed in a chemical reaction
is the heat energy stagnant in a chemical reaction
- 2. Multiple Choice
exothermic reaction
enthalpy of the products is lower than reactants
enthalpy of the products is higher than reactants
- 3. Multiple Choice
exothermic reaction
examples: neutralisation, dilution of a concentrated acid and dissolution of NaOH in water
examples: dissolution of NH4Cl and NH4NO3
- 4. Multiple Choice
bond formation
in product molecules where heat is released
in reactant molecules where heat is absorbed
- 5. Multiple Choice
If a chemical reaction is EXOTHERMIC, the temperature would....
Stay the same
Increase
Decrease
- 6. Multiple Choice
Which of the following statement is true about the breaking of bonds between molecules?
To break a bond between molecules, energy must be released by the molecule
To break a bond between molecules, no energy is needed.
To break a bond between molecules, energy must be absorbed by the molecule.
- 7. Multiple Choice
If ∆H is negative, the reaction is?
exothermic
endothermic
- 8. Multiple Choice
What is the equation to show what happens to Cl ions at the anode.
Cl- --> Cl + e-
2Cl- --> Cl2 + 2e-
Cl2 + 2e- 2Cl-
Cl2 + 2e- --> 2Cl-
- 9. Multiple Choice
Electrolysis is .....
conduction of electricity by the ionic compound in solid state
conduction of electricity by ionic compound in molten and aqueous state
- 10. Multiple Choice
What is the product formed at the anode during the electrolysis of concentrated copper(II) chloride?
copper
chlorine
hydrogen
oxygen
- 11. Multiple Choice
Complete the half equation Al3+ -->
Al3+ - 3e- --> Al
Al2+ + 3e- --> Al
Al3+ + 3e- --> Al
Al3+ --> Al + 3e-
- 12. Multiple Choice
What is electrolysis?
breaking down of a compound using a current
making a compound using a current
breaking down of a compound using a energy
none of them
- 13. Multiple Choice
Positive ions (cations) will move towards the cathode (-) where they will discharge by....
Breaking apart
Losing electrons
Clumping together.
Gaining electrons
- 14. Multiple Choice
What is the name of a positively charged ion?
positron
proton
cation
anion
- 15. Multiple Choice
Covalent compounds
Share electrons
transfer electrons
contain a sea of electrons
conduct electricity
- 16. Multiple Choice
Some average bond enthalpies, in kJ/mol, are as follows:
H-H = 436
Cl-Cl = 242
H-Cl = 431
What is the enthalpy change for the decomposition of hydrogen chloride?
2 HCl --> H2 + Cl2
-184 kJ
+ 184 kJ
- 247 kJ
+ 247 kJ
- 17. Multiple Choice
The enthalpy change for the reaction between hydrochloric acid and sodium hydroxide is −56 kJ/mol. Therefore ...
the reaction is exothermic and the temperature rises
the reaction is exothermic and the temperature falls
the reaction is endothermic and the temperature rises
ls
the reaction is endothermic and the temperature fal
- 18. Multiple Choice
Which of these diagram correctly represent an endothermic reaction?
- 19. Multiple Choice
Example of endothermic reaction is ...
Combustion
Photosynthesis
Neutralization
Respiration
- 20. Multiple Choice
What happens when chemical bonds are broken?
Energy is released
An explosion occurs
An exothermic process take place
An endothermic process take place
- 21. Multiple Choice
What is the correct formula for Sodium Oxide?
NaO
NaO2
Na2O
Na2O2
- 22. Multiple Choice
What is the FORMULA for
ammonium sulfide
(NH4)2S
NH4 S
(NH4)2S4
NH2S
- 23. Multiple Choice
If an atom of oxygen has a charge of -2, how many electrons does the atom have?
18
6
8
10
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