Question
The following chart lists examples of evidence that can be seen after a change has taken place. Use the information given previously to determine if the evidence supports a physical or chemical change occurring. (6 points) Evidence of a Physical Change Evidence of a Chemical Change Ash is present after a bonfire. There is a sour smelling liquid present in a cup of milk that was left on the counter for 3 days. A balloon is much smaller after letting the air out. There is a loud sound after a firework explodes in the air. There is a liquid substance in a pot after putting in a chunk of butter. There is a brown banana on the counter that was originally yellow.
Answers
GPT-4o mini
To determine whether the evidence supports a physical or chemical change, we can analyze each piece of evidence provided:
**Evidence of a Physical Change:**
1. **A balloon is much smaller after letting the air out.** - This indicates a change in volume but not the substance itself; thus, it is a physical change.
2. **There is a liquid substance in a pot after putting in a chunk of butter.** - This suggests the melting of butter, which is a physical change as the chemical composition remains the same.
**Evidence of a Chemical Change:**
1. **Ash is present after a bonfire.** - The formation of ash from burning indicates a chemical change as new substances are created (e.g., carbon dioxide, water, and ash).
2. **There is a sour-smelling liquid present in a cup of milk that was left on the counter for 3 days.** - The sour smell is due to the fermentation of the milk, indicating a chemical change (bacterial growth and production of lactic acid).
3. **There is a loud sound after a firework explodes in the air.** - The explosion involves a chemical reaction, producing gases and heat; therefore, it is a chemical change.
4. **There is a brown banana on the counter that was originally yellow.** - The browning of the banana indicates a chemical reaction (oxidation), signaling a chemical change.
In summary:
- **Physical Changes**: Balloon deflating, chunk of butter melting.
- **Chemical Changes**: Ash from bonfire, sour milk, firework explosion, browning banana.
Overall, the evidence clearly distinguishes between physical and chemical changes based on the nature of the changes and the properties involved.
**Evidence of a Physical Change:**
1. **A balloon is much smaller after letting the air out.** - This indicates a change in volume but not the substance itself; thus, it is a physical change.
2. **There is a liquid substance in a pot after putting in a chunk of butter.** - This suggests the melting of butter, which is a physical change as the chemical composition remains the same.
**Evidence of a Chemical Change:**
1. **Ash is present after a bonfire.** - The formation of ash from burning indicates a chemical change as new substances are created (e.g., carbon dioxide, water, and ash).
2. **There is a sour-smelling liquid present in a cup of milk that was left on the counter for 3 days.** - The sour smell is due to the fermentation of the milk, indicating a chemical change (bacterial growth and production of lactic acid).
3. **There is a loud sound after a firework explodes in the air.** - The explosion involves a chemical reaction, producing gases and heat; therefore, it is a chemical change.
4. **There is a brown banana on the counter that was originally yellow.** - The browning of the banana indicates a chemical reaction (oxidation), signaling a chemical change.
In summary:
- **Physical Changes**: Balloon deflating, chunk of butter melting.
- **Chemical Changes**: Ash from bonfire, sour milk, firework explosion, browning banana.
Overall, the evidence clearly distinguishes between physical and chemical changes based on the nature of the changes and the properties involved.