Warm air is less dense than cool air, which is why it rises. Let me know if you have any follow up questions on this!
Answer:
A base forms hydroxide ions in water.
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C4H10. The three carbons are in a string, and the hydrogens surround these carbons. It will look similarly in structure to the diagram below.
H H H
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H-C-C-C-H
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H H H
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x is the chemical symbol of the element and it must correspond to the atomic number