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Biology
| Question | Answer |
|---|---|
| What percentage of your body is made of water? | 70% |
| Describe how sweating cools the body. | The water vapor lost through the evaporation of sweat carries heat away from the body. |
| What type of bonds are responsible for cohesion? | Hydrogen bonds |
| Describe what surface tension is? | Molecules at the surface are linked together by hydrogen bonds. |
| What is adhesion in reference to water? | Adhesion makes water molecules stick to different surfaces or substances. |
| Distinguish between adhesion and cohesion. | Adhesion is an attraction between different substances and cohesion is attraction of molecules of the same kind. |
| Explain how capillary action is necessary for vascular plants. | Capillary action is when water molecules move upward through a narrow tube, such as the stem of the plant, the water is sucked up stronger than gravity can pull it down. |
| What is a solution? | A mixture in which one or more substances are evenly distributed in another substance. |
| Name two types of molecules that dissolve well in water: | Ionic compounds and polar molecules. |
| What types of molecules do not dissolve well in water? | Nonpolar molecules. |
| What two ions are formed when water breaks apart? | Hydrogen ion H+, and a hydroxide ion OH-. |
| Differentiate between an acid and a base. | Acids form hydrogen ions when dissolved in water, and bases reduce hydrogen ions. |
| Ammonia has a pH of approximately what? | pH 12 |
| What is polarity? | (battery) imbalance in the charges |
| What is the structure of a water molecule? | Mickey mouse structure - top two (ears) Hydrogen (+) big one (face) oxygen (-) |
| How does sweating cool the body? | Sweating cools the body by the heat being pulled away from you by evaporating the water. |
| What is cohesion? | water molecules attracted to water |
| What is adhesion? | water molecules attracted to other things |
| What do acids form? | Hydrogen bonds (H+) |
| What do bases form? | hydroxide (OH-) |
| 7 on the ph scale is _____, above 7 on the pH scale is _______, and below 7 is ________. | neutral, base, acid |
| Know one acid and one base on the pH scale. | Acid - vinegar Base - bleach |
| Solute _____, and solution _____. | gets dissolves, does the dissolving. |
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