6th Gr Science Ch 9-3
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15 terms
Terms | Definitions |
|---|---|
 physical change | any change in size, shape, form or state of matter; the identity of the matter stays the same; only the physical properties change |
| examples of changes of state | 1. water vapor in the air changes to liquid water when dew forms; 2. as it cools, a liquid metal becomes solid steel. 3. a solid will melt, becoming a liquid. 4. liquid water in perspiration changes to a gas when it evaporates from the skin |
| changes in state | another example of physical change |
| physical weathering | a physical change responsible for much of the shape of the Earth |
| examples of physical weathering | 1. wind and water erode rocks; 2. water fills cracks in rocks. A rock is a rock even if it is cut. |
| examples of physical changes on earth | gravity, plants, animals and the movement of land during earthquakes |
| examples of chemical changes | 1. a chip in the paint; 2. apple left out rots; 3. a penny becomes dull and dark; 4. wood burns into ash; 5. soap and tap water create soap scum; 6. baking a cake; 7. mixing baking powder and water |
| chemical changes | the original materials that make up something change into a new materials that have different properties. |
| other examples of chemical changes | 1. when you eat, food undergoes chemical changes; 2. when plants use water and carbon dioxide to make sugar and oxygen |
| products produced from chemical changes | many products we use including toothpaste |
| surface of Earth | is a result of chemical changes |
| chemical weathering | examples are caves. Rainwater slowly reacts with layers of limestone rock. It forms caves and collects minerals that it later deposits as cave formations. |
| acid rain | causes chemical weathering. 1. a marble statue that has been outside for a long time. 2. some lakes become toxic to wildlife. |
| a sign of chemical change | 1. giving off or taking in of energy; release of energy is obvious when something burns and heat is given off 2. a gas is given off or if water or a solid is formed. 3. a color change as a change in color of leaves in the fall. |
| energy change | is difficult to notice |
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