Chemical change
Filtering air to remove dust and pollen is a physical change because the process does not alter the chemical composition of the dust and pollen particles. It simply separates them from the air through physical means, such as using a filter.
Using a Bunsen burner to heat copper is a physical change. The copper undergoes a change in its physical state from solid to liquid without changing its chemical composition.
The change in matter produced by using a meat grinder to obtain ground meat is a physical change. This is because the composition and properties of the meat remain the same before and after grinding, only the physical form has changed.
Using a hot glue gun involves a physical change. The process of heating the glue stick causes it to melt and then harden when it cools down, which is a reversible change that does not alter the chemical composition of the glue.
Melting a nail is a physical change because only the state of matter is being altered, from solid to liquid, without changing the chemical composition of the nail. The nail can solidify again by cooling, showing that the change is reversible.
It is a physical change, as the chemical integrity remains the same.
No. It is a physical change.
Chemical change
Chemical change
No, it is a chemical change.
It happens when you turn on the flashlight and a circuit is created through the batteries, through the light filament, back down the outside of the batteries to the end of the batteries, etc. Switching off the flashlight breaks the circuit, curtails the chemical reaction in the batteries, and the light goes out.
different batteries and purpose
It is a physical reaction. Melting is a physical change because it does not change the chemical composition of the substance.
This is a physical change. When the electrons go through the filament (or gas), there is no chemical change, only the physical change of temperature. The electricity to power the light may be generated chemically (fossil fuels or batteries) or from a hydroelectric plant. The light from "glow sticks" is an example of light generated by chemical changes.
Depends on what source of power your using, its easier to change speed with batteries. With a cord you have to take it of and buy a special switch for it.
Filtering air to remove dust and pollen is a physical change because the process does not alter the chemical composition of the dust and pollen particles. It simply separates them from the air through physical means, such as using a filter.
Using a Bunsen burner to heat copper is a physical change. The copper undergoes a change in its physical state from solid to liquid without changing its chemical composition.