Question

A piece of magnesium and a piece of charcoal is put in two separate beakers. To each (2)beaker 5 mL of hydrochloric acid is added. A lit matchstick was brought close to the mouth of the beakers. The burning matchstick extinguishes with a pop sound when placed over the beaker with magnesium and acid but not when placed over the beaker with charcoal and acid. What comparison can be drawn between magnesium and charcoal?

Answer 1

Answer:

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Answer 2

An Acid reacts with metals like Mg to evolve hydrogen, but it does not react with non-metals (such as those found in charcoal).

• When Hydrochloric Acid is added to the beaker containing Magnesium, Hydrogen is evolved as per the equation:

                           Mg(s) + 2HCl (aq) → MgCl₂ (aq) + H₂ (g)

• When a burning matchstick is brought near the mouth of this test tube, it extinguishes with a pop sound because hydrogen evolved mixes with other compounds such as oxygen from air and releases energy.

• The same is not observed when matchstick is brought near test tube with charcoal and acid because no hydrogen evolves.
• This is because charcoal contains non-metal Carbon. Non-metals do not react with acids.

Thus from this experiment, the conclusion drawn is that Magnesium is metal whereas charcoal does not contain metallic components.