EASY
Upper Secondary: IGCSE
IMPORTANT
Earn 100

Strips of copper foil and magnesium ribbon were cleaned with sandpaper and then connected as shown below. The bulb lit up.

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Name the electrolyte used.

Important Questions on Energy Changes, and Reversible Reactions

EASY
Upper Secondary: IGCSE
IMPORTANT

Strips of copper foil and magnesium ribbon were cleaned with sandpaper and then connected as shown below. The bulb lit up.

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Explain why the bulb lit up.

EASY
Upper Secondary: IGCSE
IMPORTANT

Strips of copper foil and magnesium ribbon were cleaned with sandpaper and then connected as shown below. The bulb lit up.

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Which metal releases electrons into the circuit?

EASY
Upper Secondary: IGCSE
IMPORTANT

Strips of copper foil and magnesium ribbon were cleaned with sandpaper and then connected as shown below. The bulb lit up.

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In this arrangement, energy is being changed from one form to another. Explain.

EASY
Upper Secondary: IGCSE
IMPORTANT

Strips of copper foil and magnesium ribbon were cleaned with sandpaper and then connected as shown below. The bulb lit up.

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What is this type of arrangement called?

EASY
Upper Secondary: IGCSE
IMPORTANT

Strips of copper foil and magnesium ribbon were cleaned with sandpaper and then connected as shown below. The bulb lit up.

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Give reasons why the set-up shown above would not be used as a torch battery.

EASY
Upper Secondary: IGCSE
IMPORTANT
The gas hydrazine, undefined, burns in oxygen like this:

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Count and list the bonds broken in this reaction.

EASY
Upper Secondary: IGCSE
IMPORTANT
The gas hydrazine, undefined, burns in oxygen like this:

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Count and list the new bonds formed.

EASY
Upper Secondary: IGCSE
IMPORTANT
The gas hydrazine, undefined, burns in oxygen like this:

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Calculate the total energy required to break the bonds. 

(The bond energies in kJ/mole are : N-H 391; N-N 158; NN 945; O-H 464; O=O =498)