*6.6E

Identify the formation of a new substance by using the evidence of a possible chemical change, including the production of a gas, change in thermal energy, production of a precipitate, and color change.

Physical weathering Examples

Chemical Erosion Examples

Physical and Chemical Weathering

Directions: Identify these digestive processes as either physical or chemical changes.

1. Chewing

2. Mixing of saliva

3. Swallowing

4. Churning in the stomach

5. Acids in the stomach

6. Enzymes in the liver

7. Acids and enzymes in the small intestine

8. Absorption of water in the large intestine

Check Your Understanding

Define chemical change.
Define physical change
List examples of chemical changes in digestion
List some examples of physical changed in digestion
List some examples of chemical changes in weathering
List some examples of physical changed in weathering

1. Change in their chemical properties or composition, resulting in the formation of at least one new substance.2. Changes affecting the form of an object, but not its chemical make up. 3. Saliva, Chemical like hydrochloric acid in the stomach. Small intestine. 4. Chewing in the mouth. Churning in the stomach. 5. Water (hydrolysis), Oxygen (oxidation), Acids, living organisms producing acids6. flowing water, plant growth, Ice (freezing and thawing), Wind, Gravity

Practice answering the following STAAR questions

Answers: G,F, C