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There’s one Earth
Air is mostly:
nitrogen and carbon dioxide
oxygen and carbon dioxide
nitrogen and oxygen
Air liquefies at about:
Which gas (nitrogen, oxygen or carbon dioxide) liquefies at the lowest temperature?
Which gas (nitrogen, oxygen or carbon dioxide) is removed from the top of the fractionating column when liquefied air is distilled?
What is the main salt in seawater?
Which three products form when electricity is passed through concentrated salt solution?
sodium, chlorine and hydrogen
sodium hydroxide, chlorine and hydrogen
sodium hydroxide, chlorine and oxygen