Answer:Well There is many ways to increase friction between objects. One being rubbing the two objects together quicker and harder. If there is any sort of wetness or anything related to that make sure to dry the surface between the two objects you want to create friction between so it will be more effective.
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Here's what I find.
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The sign of ΔH changes when you reverse the reaction.
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runoff is he draining away of water (or substances carried in it) from the surface of an area of land, a building or structure, etc.
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It would be an atom. Hope this helps! :)