Changes around us
ಈ ಪುಟವನ್ನು ಕನ್ನಡದಲ್ಲಿ ನೋಡಲು ಇಲ್ಲಿ ಕ್ಲಿಕ್ ಮಾಡಿ
Objectives:
- Identify a chemical or physical change based on macro and micro observations.
- Recognize that the same object can undergo both chemical and physical changes
Process:
As you explore the simulation, answer the following questions.
1. Explore the simulation
1. What state of matter is snow? Why?
2. A substance has a fixed volume. What else do you need to know to determine its state of matter?
3. How do particles change as the temperature increases in a system? Is this a chemical or physical change?
4. Why is the state of matter a physical property of matter?
5. How does a liquid change as it is moved from one container to another?
6. Why is it hard to measure the volume of a gas?
7. Your friend looks at a piece of ice and says “Solids, like ice, have a fixed shape because the particles are not moving.” Is your friend correct? Why or why not?
2. Explore the simulation
https://interactives.ck12.org/simulations/chemistry/campout/app/index.html?lang=en
1. Fill in the table below with all the chemical and physical changes in the simulation
| Chemical changes | Physical changes |
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2. How can you use chemical formulas to determine if a change is either chemical or physical?
3. How do particles differ after a physical change?
4. How do particles differ after a chemical change?
5. If the metal stake broke instead of bent, would it be a chemical or physical change? Explain your reasoning.
6. Do you think glass breaking is a physical or chemical change? Defend your answer.
7. Your friend says, “Chemical changes are caused by an input of energy. In physical changes, there is no transfer of energy.” Is your friend correct? Why or why not?
3. Explore the simulation
1. Does the temperature of the water rise while it is boiling?
2. When you boil water, why does the level of liquid decrease?
Question for thought : How do you think these resources useful for teaching the concept of physical and chemical change? Explain.