savannahvargas512
04.02.2020 •
Chemistry
Which clue can be used to identify a chemical reaction as a combustion reaction
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Ответ:
I don't really know how to eliminate the other choices. The answer is B. Any time oxygen and a hydrocarbon react there is a fire of some sort.
In Alberta Canada where I live, many homes are heated with natural gas. They all burn the same way. They give a characteristic blue flame which, however, is better seen when you burn alcohol. Methane burning looks like this (chemical equation)
CH4 + 202 ===> CO2 + 2H20
Notice that the hydrocarbon and Oxygen are on the left and they "burn" to produce a flame, Water and Carbon Dioxide.
Ответ:
A solution is made when a solid (which we call a solute) dissolves into a liquid (that we call the solvent) one example of a solution is salt dissolved in water. The salt and water can be separated again by evaporation (the water will evaporate if left in a got place leaving the salt behind. I don't know if that was the answer that you were looking for