When carbon unites with oxygen, it forms a colorless, odorless, and tasteless gas called carbon dioxide (CO2), which is heavier than air and will extinguish a flame.
Carbon dioxide is like nitrogen in many ways (mention them), but if it be mixed with lime water, it causes the clear liquid to become milky, while nitrogen does not. This is the test for carbon dioxide.
Carbon dioxide is a plant food; plants having the power to take this gas from the air, combine it with water, and make it into their tissues —in fact it is from this source that all organic carbon comes.
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