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Biology
Ch. 4 The Chemical Basis of Life
| Question | Answer |
|---|---|
| anything that has mass and takes up space | matter |
| the smallest form of an element that retains properties of that element | atom |
| the simplest form of a substance that can not be broken down by ordinary means | element |
| the four most important elements to living things | carbon, hydrogen, oxygen, nitrogen |
| have a positive charge | protons |
| have a negative charge | electrons |
| have a neutral charge | neutrons |
| Where are protons located? | nucleus |
| Where are neutrons located? | nucleus |
| Where are electrons located? | outside of the nucleus |
| shows how many electrons there are | planetarry model |
| shows where electrons might be | orbital model |
| share electrons | covalent bonds |
| give electrons | ionic bonds |
| when two substances combine to form a complex substance | synthesis |
| when complex substances break down simple substances | decomposition |
| when two substances exchange a part of themselves | exchange |
| an atom that is electrically charged as a result of gaining or losing electrons | ion |
| an element that has alternate forms | isotope |
| four properties of water | stickiness, temperature moderation, low density of ice, nearly universal solvent |
| four properties of acids | pH is below 7, feels like water, taste sour |
| four properties of bases | pH is above 7, feel slippery, usually in a liquid form, taste bitter |
| cause solutions to resist changes in pH | buffers |
| compound that donates H+ ions to a solution | acid |
| compound that removes H+ ions from an aqueous solution | base |
Created by:
cmcfadden
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