CHEMICAL & PHYSICAL CHANGES VIRTUAL LAB

Virtual lab for 8th grade science: explore chemical and physical changes!

Link to Virtual Lab How are physical and chemical changes distinguished? Chemistry is the study of matter and the changes it undergoes. These changes can be classified into two types: physical and chemical. In a physical change, one or more of a substance's physical properties - its size, shape, color, or state (phase) of matter - is altered. Grinding, melting, dissolving, and evaporating are all examples of physical changes. No new substances are formed as a result of a physical change, although substances may be broken into smaller pieces of the same substance.A chemical change results in the formation of one or more new substances. The new substances differ in chemical properties and composition from the original substance. When a chemical change has taken place, many signs can indicate this. Some of these signs are: the release of energy in the form of light, heat, or sound; bubbling (due to the release of gas); odor changes; and color changes.In this virtual lab you will view videos of matter changing and determine whether the changes you observe are physical or chemical in nature. Objectives 1. Identify characteristics of physical changes of matter.2. Identify characteristics of chemical changes of matter.3. Recognize examples of physical and chemical changes.4. Record observations of physical and chemical changes of matter. Procedure 1. Select one of the four events and view the video. You can stpo the video at any point and watch it as many times as you wish.2. Click the Play button to play and pause the video.4. Click the fast forward button to step ahead a few frames in the video.5. Click the stop button to rewind the video to the beginning.5. Use your observations to fill out all the items on the table below. When all boxes are filled, decide whether the changes you observed represent a physical or chemical change of matter and indicate your choice in the table.6. When you are finished with your table, complete the journal questions below. Observations In the changes occurred column indicate if any of the following occurred:shape changecolor changebubble formedodor productionheat given offsize changechange of statenew substance formedsound productionlight production Event # Describe what happned Changes occurred Chemical or Physical? Is evaporation of water a physical change or a chemical change? How do you know? What are the 5 evidences that indicate that a chemical change has taken place? Give an example of a chemical change that you encounter every day. How do you know this is a chemical change? Explain how a burning candle demonstrates both a physical and chemical changes. Of the events you observed, compare the substances that underwent chemical change. What were the similarities and differences in these changes? Of the events you observed, compare the substances that underwent physical change. What were the similarities and differences in these changes?