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ScienceNightPosterBoard - Substances that will mix well and...

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Substances that will mix well and dissolve in water (e.g. salts ) are known as hydrophilic ("water-loving") substances Hydrophilic: “water-loving” substances—substances that mix well with water Hydrophobic: “water-fearing” substances—substances that do not mix well with water Relative Density: ratio of the density of a substance to the density of a reference material Water molecules are attracted to water molecules Oil molecules are attracted to oil molecules What’s happening? The oil molecules are attracted to each other, so they try to group up. This experiment is a demonstration of that old scientific truth: “oil and water don’t mix.” Another important scientific property being demonstrated here is the movement of liquid molecules and the effects of "relative density." Oil molecules like to stick to other oil molecules more than they like to stick to water molecules. Likewise, water molecules are attracted to other water molecules more than they are to oil molecules. Left to their own devices, oil and water will push each other away and try to get as far away from one another as possible. When you pour the food coloring into the oil and shake it, the two will mix briefly, but the mixture is quite
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ScienceNightPosterBoard - Substances that will mix well and...

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