Alkanes are saturated hydrocarbon, that is they contain hydrogen and carbon without a double or triple bond between the carbon atoms, e.g. ethane, propane. Group 7a in the periodic table are called halogens e.g chlorine, bromine. Alkanes react with halogens in a reaction called substitution, where halogens replace hydrogen atoms in alkanes.
The elements Carbon, Hydrogen, and Oxygen are all part of Non-Metals.
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The astronomical unit or also know as AU. Scientists use this because it’s convenient and easier to understand! Hope this helps ;)
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Humidity is the measure of how much water vapor is in the air.
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They form a covalent bond
