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23.
Part a· 2 steps
Observing the diagram, moist sand is heated in a test tube, and a magnesium ribbon is in a combustion tube.
There is no connection between the test tube and the combustion tube.
For magnesium to react with the steam produced from the moist sand, the steam needs to be directed to the magnesium.
The absence of a tube to carry the steam from the moist sand to the combustion tube is the main omission.
Answer: The omission is a
Part b· 2 steps
When the omission is corrected, steam will come into contact with the heated magnesium.
Magnesium reacts with steam to produce magnesium oxide and hydrogen gas.
Writing the word equation.
Answer:
Part c· 6 steps
When magnesium reacts with steam, it burns with a bright white flame.
The product formed is magnesium oxide, which is a white powder.
Answer:
24.
Hydrogen gas has various uses in industry and daily life.
Two uses of hydrogen are as a fuel and in the manufacture of ammonia.
Answer:
- It is used as a fuel (e.g., in rockets and fuel cells).
- It is used in the Haber process for the manufacture of ammonia.
25.
Potassium is an alkali metal that is highly reactive with water.
When a small piece of potassium is added to cold water, it reacts vigorously.
Answer:
- The potassium floats on the water and melts into a silvery ball.
- It moves rapidly on the surface of the water.
- It burns with a lilac flame.
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