When volcanoes erupt, they emit a mixture of gases and particles into the air. Some of them, such as ash and sulphur dioxide, have a cooling effect, because they (or the substances they cause) reflect sunlight away from the earth. Others, such as CO2, cause warming by adding to the the greenhouse effect.
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You can identify an unknown substance by measuring its density and comparing your result to a list of known densities. Density = mass/volume. Assume that you have to identify an unknown metal.
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The SI base unit for amount of substance is the mole. 1 grams NaOH is equal to 0.025001806380511 mole.
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the fastest would be gas, liquid would be in the middle and solid would be the slowest
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