State your observation for the following: [5]
a) A strip of magnesium ribbon is heated. [1]
b) Sodium chloride is mixed with water and stirred. [1]
c) Zinc is dropped in dilute hydrochloric acid. [1]
d) Moist blue litmus paper is introduced in a jar of hydrogen gas. [1]
e) Potassium is dropped in cold water.
Answers
Explanation:
1.When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide. ... After it burns, it forms a white powder of the magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product. This is an exothermic reaction.
2.This is because there is some space between the particles of water in which the salt particles get accomodated when dissolved.
3.When dilute hydrochloric acid is added to granulated zinc placed in a test tube, zinc metal is converted to zinc chloride and hydrogen gas is evolved in the reaction. In the reaction we can see that a zinc chloride salt is formed and hydrogen gas is evolved. The evolved hydrogen gas is colourless and odourless.
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5.Potassium is highly reactive metal and it reacts violently with cold water. Potassium , when dropped in beaker containing water, we can see that potassium moves in water making hissing sound and catches fire easily. Potassium reacts with water to form potassium hydroxide and hydrogen gas.
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