Ch. 1- Chemical reactions and equations

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4 Terms

1
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Magnesium ribbon is rubbed before being burnt. Why?

Magnesium ribbon gets coated with a white oxide layer which interferes pr slows down the burning of ribbon.

To increase the period of burning of ribbon, the oxide layer is rubbed off of the magnesium ribbon by a sandpaper.

2
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Why does magnesium ribbon produce white flame and powder after being burnt?

Magnesium reacts with oxygen.

Mg + O2 —> 2MgO

3
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Factors showing chemical reactions

Change in state / colour / temperature, evolution of gas, formation of precipitate.

4
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Slaking of lime happens when-

Quicklime reacts with water and produces slaked lime and a large amount of heat is released. This is also known as slaking of lime.