Question
There is a loud sound after a firework explodes in the air
Evidence of a Physical change
Evidence of a Chemical change
Evidence of a Physical change
Evidence of a Chemical change
Answers
GPT-4o mini
In the context of fireworks, the loud sound produced after a firework explodes primarily represents evidence of a **physical change** and **a chemical change** happening simultaneously. Let's look at both:
### Evidence of a Physical Change:
1. **Sound Waves**: The explosion creates sound waves as the air pressure changes rapidly due to the explosion. This is a change in the physical state of the air, which generates the loud sound you hear. The movement and vibration of air molecules is a physical phenomenon.
### Evidence of a Chemical Change:
1. **Chemical Reactions**: The explosion of fireworks is the result of combustion, which is a chemical reaction between the oxidizers and fuels in the firework. During this reaction, new substances are formed, such as gases (carbon dioxide, smoke), heat is released, and a change in color can be observed (such as the bright flashes of light produced by different metal salts burning). This indicates a chemical change.
In summary, the loud sound itself is a result of physical changes (sound waves created by air pressure change), while the combustion and transformation of materials in the firework represent chemical changes.
### Evidence of a Physical Change:
1. **Sound Waves**: The explosion creates sound waves as the air pressure changes rapidly due to the explosion. This is a change in the physical state of the air, which generates the loud sound you hear. The movement and vibration of air molecules is a physical phenomenon.
### Evidence of a Chemical Change:
1. **Chemical Reactions**: The explosion of fireworks is the result of combustion, which is a chemical reaction between the oxidizers and fuels in the firework. During this reaction, new substances are formed, such as gases (carbon dioxide, smoke), heat is released, and a change in color can be observed (such as the bright flashes of light produced by different metal salts burning). This indicates a chemical change.
In summary, the loud sound itself is a result of physical changes (sound waves created by air pressure change), while the combustion and transformation of materials in the firework represent chemical changes.