C1 - Air Quality 0.0 / 5 ? ChemistryAir QualityGCSEOCR Created by: sophie99Created on: 27-01-14 19:07 For a long time, the Earth's early atmosphere was mostly CO2. Where did this CO2 come from? The volcanoes. They gave out lots of gas. 1 of 5 What three main gases is the current atmosphere made of and in what proportions are they found? Nitrogen (78%), Oxygen (21%) and Argon (1%). 2 of 5 Atoms can disappear completely in some chemical reaction - true or false? False. 3 of 5 What is a hydrocarbon? A fuel containing carbon and hydrogen. 4 of 5 Name the main element that makes up coal. Carbon. 5 of 5
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