Chapter 3 bio
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22 terms
Terms | Definitions |
|---|---|
 Polar Molecule | Opposite ends of a molecule have opposite charges due to a difference of electronegativity. |
| Cohesion | When hydrogen bonds hold a substance together. |
| Adhesion | The clinging of one substance to another. |
| Surface Tension | A measure of how difficult it is to stretch or break the surface of a liquid. |
| Heat | A measure of the total amount of kinetic energy due to molecular motion in a body of matter. |
| Temperature | Measures the intensity of heat due to the average kinetic energy of the molecules. |
| Specific heat | The amount of heat that must be absorbed or lost for 1 g of that substance to change its temperature by 1 degree C. |
| Specific heat of water | 1 cal/g/degree C |
| Heat of vaporization | The quantity of heat a liquid must absorb for 1 g of it to be converted from the liquid to a gas. |
| water's heat of vaporization | 540 cal/g at 100 degrees Celcius. |
| What is the solvent of life? | Water. |
| Aqueous solution | A solution in which water is the solvent. |
| Hydrophilic | Any substance that has an affinity for water. |
| Hydrophobic | A substance that is nonionic and nonpolar that actually seems to repel water. |
| Hydroxide group structure? | OH⁻ |
| Acid | A substance that increases the hydrogen ion concentration of a solution. |
| Base | A substance that reduces the hydrogen ion concentration of a solution. |
| pH | −log[H⁺] |
| Buffer | A substance that minimizes change in the concentrations of H⁺ and OH⁻ in a solution. |
| Electronegativity | The attraction of electrons to an atom. |
| Heat of fusion | A substance goes from a liquid to a solid |
| Water's heat of fusion? | 80 cal/g at 0°C |
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