Vocab for Chapter 3
Terms : Hide Images
| 453367007 | polar molecule | molecule in which opposite ends have opposite electric charges | |
| 453367008 | cohesion | The phenomenon that allows water molecules to be structured by hydrogen bonds is called | |
| 453367009 | adhesion | the clinging of one substance to another Example: adhesion of water can help it to counter the downward pull of gravity | |
| 453367010 | surface tension | a measure of how difficult it is to stretch or break the surface of a liquid | |
| 453367011 | Water moderating air temperature | Absorbing heat from air that is warmer and releasing the stored heat to air that is cooler | |
| 453367012 | kinetic energy | energy of motion | |
| 453367013 | heat | a measure of the total amount of kinetic energy due to molecular motion in a body of matter | |
| 453367014 | temperature | measures the intensity of heat due to the average kinetic energy of the molecules | |
| 453367015 | calorie | amount of heat it takes to raise the temperature of 1 gram of water by 1 degree celsius | |
| 453367016 | heat of vaporization | quantity of heat a liquid must absorb for 1 gram of it to be converted from the liquid to the gaseous state | |
| 453367017 | evaporative cooling | as a liquid evaporates, the surface of the liquid that remains cools down, because the "hottest molecules" have left as gas | |
| 453367018 | solution | liquid that is completely homogeneous mixture of two or more substances is a called a solution | |
| 453367019 | solvent | dissolving agent of a solution | |
| 453367020 | solute | substance that is dissolved | |
| 453367021 | hydration shell | the sphere of water molecules around each dissolved ion | |
| 453367022 | Does a compound need to ionic to dissolve in water? | No, compounds made up of nonionic polar molecules polar molecules are also water soluble | |
| 453367023 | hydrophilic | any substance that has an affinity for water | |
| 453367024 | colloid | due to their size, large molecules that are hydrophilic can exist in water without dissolving | |
| 453367025 | hydrophobic | substances that repel water | |
| 453367026 | ph | scale runs between 0 and 14 and measures acidity | |
| 453367027 | acids | have an excess of H+ ions and ph below 7 | |
| 453367028 | bases | have an excess of OH- ions and ph above 7 | |
| 453367029 | buffers | substances that minimize changes in pH | |
| 453367030 | carbonic acid | important buffer in living systems, moderates pH changes in blood plasma and the ocean |
