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POW Quiz
| Question | Answer |
|---|---|
| what is a water molecule made up of? | H20; one oxygen and two hydrogen |
| Is water polar? | yes; oxygen acts as negative hydrogen acts as positive. |
| Is water neutral? | yes; equal amount of e- and p+---- Zero Net charge |
| what is a polar molecule | A compound with one negativily charged side and one positivly charged side. |
| What exisits between water molecules? | hydrogen bonds; formed between highly electronegative atom of a polar molecule and a hydrogen. |
| One hydrogen bond is ____ but many of them are ____ | weak,strong |
| How is a hydrogen bond formed? | Negative oxygen end of one molecule is attracted to the positive hydrogen end of the oxygen molecule. |
| At sea level, when does pure water boil and freeze? | boil- 100 degrees celcius freeze- 0 degrees celcius |
| The boiling temprature of water ____ at higher elevations | decreases, lower atmospheric pressure |
| Will an egg take shorter or longer to boil at higher alttitudes? | longer |
| What is cohesion? | water molecules stick to eachother |
| What does cohesion result in? | surface tension. |
| What is surface tension? | strength of waters surface |
| What does surface tension allow? | produces a surface film on water that allows insects to walk on the surface of water. |
| what is adhesion? | attraction between two different substances. (water molecules stick to other materials) |
| water makes ______ _____ with other surfaces such as glass. soil, plant tissues, and cotton. | hydrogen bonds. |
| what is capillary action? | the ability of water to move upward, against gravity, through small openings. |
| whats an example of capillary action? | Move through the roots of plants and through the tiny blood vessels in our bodies) also...process in which plants and trees remove water from soil, and paper towels to soak up water. |
| ____ causes capillary action | ADEHESION, polarity, and cohesion |
| amount of heat needed to raise or lower 1g of a substance 1 degrees celcius. | high specific heat. |
| water _____ temprature change both for heating and cooling. | resists |
| specific heat index | water can absorb lots of heat before it begins to get hot. |
| water can absorb or realease ___ amounts of heat energy with ___ change in actual tempreture. | large,little |
| amount of energy to convert 1g or a substance from liquid to gas. | high heat of vaporizization |
| In order to evaporate what must be broken? | hydrogen bonds. |
| As water evaporates it moves a lot of ____ with it. | heat |
| what forms a global blanket to keep the earth warm? | water vapor |
| ice is ____ dense as a ____ then as a ____ | solid, liquid. |
| liquid water has hydrogen bonds that are constantly being ___ and ____. | broken, reformed. |
| frozen water forms a _____ ____ ____ whereby molecules are set at fixed distances. | crystal like latice. |
| what process is water important to? | homeostasis |
| why is water important to homeostasis? | makes a good insulator, resists temprature change, universal solvent, coolent, temprature extremes (frozen lakes) |
| what is a universal solvent? | A universal solvent is a substance that dissolves most chemicals. Water is called the universal solvent because it dissolves more substances than any other solvent. |
| What are the two types of mixtures? | solutions and suspensions |
| solutions and suspensions are two types of _______ that both contain ______. | universal solvent, water |
| solute | substance being dissolved |
| solvent | substance in which the solute dissolves |
| suspension | solutions that dont dissolve but seperate into tiny peices |
| _____ keeps the peices _____ so that they dont settle out. | water, suspended |
| What is this equation: H20-->H+ + OH | dissociation (seperation) |
| H20 | hydrogen ion acid |
| H+ + OH | hydrogen ion base |
| ph of 7 is... | neutral |
| ph of 0 up to 7 is.. | acid |
| ph above 7-14 is.... | basic |
| What acids have a ph of 1-3 | strong acids |
| what does the ph scale range from? | 0-14 |
| each pH unit represents a factor of ___X change in concentration. | 10X (ph of 3 is 1000 times stronger than a pH of 6) |
| Acids produce a lot of _____ ions, while bases contain a lot of _____ ions. | H+, OH |
| What bases have a pH of 11-14 | strong bases |
| ____ is a measure of the hydorgen ion concentration of a solution. | pH |
| weak acids or bases that react with strong acids or bases to help prevent sharp, sudden changes in pH | buffers |
| buffers are produced ____ by the body to maintain _____ | naturally, homeostasis. |
| what process in plants is due to capillary action? | transportation |
| what does a ph of 7 mean | neither acidic or basic (pure water) |
Created by:
17shobart