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Element Symbols

Terms in this set (36)

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CHEMISTRY

If the temperature in a citrus orchard drops below $-2^{\circ} \mathrm{C}$ for several hours, the fruit will freeze and be destroyed. Citrus growers spray tiny droplets of heated water to protect the crop if a freeze is predicted. Part of the protection comes from the heat released as the heated water cools. However, much of the heat that protects trees from freezing is released as the water freezes. The phase change from liquid to solid releases 6.01 kilojoules of energy for each mole of water. Creating a layer of ice on the tree actually prevents it from freezing. How is the enthalpy of fusion of water involved in protecing citrus crops from freezing? F. Heat is released as water changes from gas to liquid. G. Heat is released as water changes from liquid to gas. H. Heat is released as water changes from liquid to solid. I. Heat is released as water changes from solid to liquid.

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CHEMISTRY

What is Brownian motion, and what causes it?

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CHEMISTRY

Suppose you decide to define your own temperature scale with units of 0, using the freezing point $$ \left( 13 ^ { \circ } \mathrm { C } \right) $$ and boiling point $$ \left( 360 ^ { \circ } \mathrm { C } \right) $$ of oleic acid, the main component of olive oil. If you set the freezing point of oleic acid as $$ 0 ^ { \circ } \mathrm { O } $$ and the boiling point as $$ 100 ^ { \circ } \mathrm { O } $$ what is the freezing point of water on this new scale?

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CHEMISTRY

On a dry day, your body can accumulate static charge from walking across a carpet or from brushing your hair. If your body develops a charge of - 15 $\mu \mathrm{C}$ (microcoulombs), how many excess electrons has it acquired? What is their collective mass?

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