Answer the following questions:-
Q1. Why magnesium ribbon is cleaned before burning?
Q2. Why is it advised to wear dark colored glass while burning magnesium ribbon?
Q3. What is the chemical formula and nature of the white ash obtained during
combustion of Mg ribbon?
Q4. What is the gas evolved in activity 1.2?
Q5. How can you detect the presence of gas?
Q6. What will happen if solid zinc chips instead of granules were used?
Q7. What could be the observation if sulphuric acid is replaced with hydrochloric
acid?
Q 8. Define chemical reaction.
Answers
Answer:
1. Magnesium ribbon should be cleaned with sandpaper before burning in the air. ... To remove the Magnesium oxide layer from the ribbon which may prevent or slow down the burning of magnesium ribbon. Unwanted impurities deposited on the magnesium ribbon can be removed and only pure magnesium can be used for the reaction.
2. It is suggested to wear dark coloured Googgles while watching the burning of magnesium ribbon because a dazzling white light is produced during the reaction which can cause harm to our eyes.
3.The ribbon burns with a bright white light. Intense heat is also produced in this reaction. Here, when magnesium burns, it reacts with the oxygen found in air to form a powdery ash called magnesium oxide. Chemical equation: Magnesium plus Oxygen gives Magnesium oxide.5. A splint is lit and held near the opening of the tube, then the stopper is removed to expose the splint to the gas. If the gas is flammable, the mixture ignites. This test is most commonly used to identify hydrogen, which extinguishes with a distinctive 'squeaky pop' sound.
6.Answer: (a) When zinc dust is taken instead of zinc granules to react with sulphuric acid, the hydrogen gas is formed. ... Thus, when hydrochloric acid is used at the place of sulphuric acid, zinc chloride is formed in place of zinc sulphate; along with hydrogen gas and reaction takes place at the same
7. Zinc
8.a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
Answer:
Magnesium ribbon should be cleaned with sandpaper before burning in the air. ... To remove the Magnesium oxide layer from the ribbon which may prevent or slow down the burning of magnesium ribbon. Unwanted impurities deposited on the magnesium ribbon can be removed and only pure magnesium can be used for the reaction
The ribbon burns with a bright white light. Intense heat is also produced in this reaction. Here, when magnesium
burns, it reacts with the oxygen found in air to form a powdery ash called magnesium oxide. Chemical equation: Magnesium plus Oxygen gives Magnesium oxide
When zinc dust is taken instead of zinc granules to react with sulphuric acid, the hydrogen gas is formed. ... Thus, when hydrochloric acid is used at the place of sulphuric acid, zinc chloride is formed in place of zinc sulphate; along with hydrogen gas and reaction takes place at the same rate.
the colourless and odourless gas evolves with bubbles
Hope this helps you
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