Page 111 - Innovator's Science-8

compound is that it is composed of mul ple elements, whereas an element is a single type of atom.
Therefore, a substance cannot be both a single type of atom and a combina on of different types of
atoms simultaneously.

9. How would our daily lives be changed if water were not a compound but a mixture of hydrogen and
oxygen?

Ans. Water’s role in life and nature depends on it being a compound with stable proper es. If it were a
mixture, it would be dangerous and unusable, making life as we know it impossible.

Impact on Daily Life
• No safe drinking water → Life would not be possible.
• No water for agriculture → Crops would not grow.
• No water for cleaning or cooking → Daily tasks would be unsafe.
• No aqua c life → Fish and underwater plants would die.
• Increased fire hazards → Hydrogen and oxygen together are explosive.

10. Analyse the figure. Iden fy Gas A. Also, write the word
equa on of the chemical reac on.

Gas (A)____?
Dilute
hydrochloric acid
Ans. By analysing the figure, it is found that there will be a chemical
Iron filings
reac on inside the test tube between dilute HCl and Fe.
2HCl + Fe → FeCl2 + H2 ↑
So the reac on forms Iron Chloride (FeCl2) and the gas above will be Hydrogen (H2).
Hydrochloric Acid + Iron filing → Iron Chloride + Hydrogen (g)
Thus, Gas A = Hydorgen

11. Write the names of any two compounds made only from non-metals, and also men on two uses of
each of them.
Ans. 1. Carbon Dioxide (CO2)
Made of: Carbon and Oxygen (both non-metals)
Uses:
• Used in fire ex nguishers to put out flames.
• Used by plants during photosynthesis to make food.
2. Sulfur Dioxide (SO2)
Made of: Sulfur and Oxygen (both non-metals)

Uses:
• Used as a preserva ve in dried fruits and wines.
• Used in the manufacture of sulfuric acid, an important industrial chemical.
12. How can gold be classified as both a mineral and a metal?

Ans. A mineral is a naturally occurring substance with a definite chemical composi on.
Gold is found in nature in its na ve form, o en embedded in rocks or alluvial deposits. It is extracted
through mining, making it a metallic mineral. Minerals like gold are formed by natural geological
processes.

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Science-8