Question

Ash is present after a bonfire. Is that evidence of a physical change or a chemical change next there is a sour smelling liquid present and a cup of milk that was left on the counter for three days. Is that a physical change or a chemical change next balloon is much smaller after letting the air out is that a physical change or a chemical change Next there is a loud sound after a firework explodes in the air is that physical or a chemical change there is a liquid substance in a pot after putting in a chunk of butter is that physical or chemical change and last there is a brown banana on the counter that was originally yellow is that physical or chemical change ?

Answer 1

Let's analyze each situation in terms of whether it represents a physical change or a chemical change:

1. Ash is present after a bonfire: This is evidence of a chemical change. The wood has undergone combustion, resulting in new substances (ash, gases).

2. Sour smelling liquid from a cup of milk left out for three days: This is a chemical change. The milk has gone through a process of souring due to the growth of bacteria, resulting in new substances (lactic acid, etc.).

3. Balloon is much smaller after letting the air out: This is a physical change. The air inside the balloon is being released; the substance (air) remains the same, but its quantity in the balloon changes.

4. Loud sound after a firework explodes in the air: This is a chemical change. The explosive materials in the firework undergo a rapid chemical reaction that produces light, sound, heat, and gas.

5. Liquid substance in a pot after putting in a chunk of butter: This is generally a physical change. The butter melts and turns into a liquid, but the chemical composition of the butter remains the same.

6. Brown banana on the counter that was originally yellow: This is a chemical change. The banana is undergoing ripening and oxidation processes, which result in new substances and a change in color.

In summary:

1. Chemical change
2. Chemical change
3. Physical change
4. Chemical change
5. Physical change
6. Chemical change