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Properties of Water
Water, Matter, and pH
| Term | Definition |
|---|---|
| polar | unequal sharing of electrons |
| cohesion | water sticks to water |
| adhesion | water sticks to other substances |
| surface tension | the film formed on the surface of water; caused by cohesion |
| capillary action | water to move upward |
| universal solvent | water dissolves many substances |
| atom | smallest unit of matter |
| element | pure substance consisting of 1 type of atom |
| compound | 2 or more elements bonded in a fixed proportion |
| radioactive isotope | unstable nucleus of an atom that breaks down at a constant rate |
| ionic bond | bond created when electrons are transferred |
| covalent bond | bond created when electrons are shared |
| hydrogen bond | weak bond formed between the oxygen of one water molecule and the hydrogen of another |
| molecule | atoms held together by covalent bonds |
| solute | substance that is dissolved |
| solvent | substance that dissolves the solute |
| solution | solute+solvent |
| suspensions | water and non-dissolved material |
| isotope | atoms of the same element with different number of neutrons |
| mixture | 2 or more elements mixed but easy to physically separate |
| ionize | break and form bonds |
| acid | ph below 7: more H+ ions |
| base | ph above 7. more OH- |
| neutral | ph of 7 |
| buffer | weak acid or base that reacts with strong ones to prevent sudden changes in pH. helps to maintain homeostasis. |
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