state whether the following statements are true or false:
(a) the composition of air is always exactly the same.
(b) nitrogen present in air supports the process of burning
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Answer:
a) False. The composition of air is not always the same.
b) False. Oxygen gas supports the process of burning.
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Answer ::::::::;:;:;::::::::::::::
(a) So what is air, exactly? It's a mixture of different gases. The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen
(b) Ans: Nitrogen Q15: Nitrogen supports burning of a candle. True/ False. Ans: False Q16: Animals consume oxygen for ___________________ and produce carbon dioxide.
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