Air and Atmosphere — Flashcards
ICSE · Class 6 · Chemistry
30 flashcards for Air and Atmosphere (ICSE Class 6 Chemistry) to test yourself on key terms and facts. Part of the ICSE Class 6 Chemistry syllabus.
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What is the percentage of nitrogen in air by volume?
Answer
Nitrogen makes up approximately 78% of the air by volume. It is the most abundant gas in the Earth's atmosphere.
What is the percentage of oxygen in air by volume?
Answer
Oxygen makes up approximately 21% of the air by volume. It is essential for respiration and combustion.
Why is air considered a mixture and not a compound?
Answer
Air is a mixture because: 1. Its components retain their individual properties. 2. No energy change occurs when gases mix. 3. Composition varies with place and time. 4. Components can be separated by …
Write the balanced chemical equation for respiration in humans.
Answer
$$\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{Energy}$$ Glucose reacts with oxygen to produce carbon dioxide, water, and energy. This process…
What happens when a burning candle is covered with a glass tumbler?
Answer
The candle burns for some time and then gets extinguished because the oxygen inside the tumbler is used up. This proves that air (oxygen) is necessary for burning.
What is the chemical name of lime water?
Answer
Lime water is calcium hydroxide, with the chemical formula Ca(OH)₂. It is used to test for the presence of carbon dioxide.
What change occurs when carbon dioxide is passed through lime water?
Answer
$$\text{Ca(OH)}_2(aq) + \text{CO}_2(g) \rightarrow \text{CaCO}_3(s) + \text{H}_2\text{O}(l)$$ Lime water turns milky due to the formation of white insoluble calcium carbonate (CaCO₃). This is a confir…
Why does dew form on grass in the morning?
Answer
Dew forms when water vapour in the air condenses on cold surfaces like grass during the early morning. This shows that air contains water vapour.
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