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water in body 70% cells need water for nutrients to move into and out of your cells water and heat absorbs heat slowly & keeps energy cohesion attraction between same substances adhesion attraction between different substances solution mixture of evenly distrubuted substances Polar molecules dissolve easily in water (so do ionic compounds) Nonpolar do NOT dissolve easily in water (ex. oil) acid form hydrogen ions in water; pH is below 7 base reduce number of hydrogen ions in water; pH is above 7 pH value representing number of hydrogen ions; value between 0-14 neutral pH 7