Give an example of a physical change and a chemical change for iron
Sure! Let's start with a physical change involving iron. One example is when iron changes its state from solid to liquid as it is heated.
To observe this physical change, you can follow these steps:
1. Take a piece of iron, such as a metal rod or nail.
2. Apply heat to the iron using a Bunsen burner or any other heat source.
3. As the iron is heated, you will see it changing from a solid state to a liquid state, specifically melting into a molten form.
Now, let's move on to a chemical change involving iron. One example is the rusting of iron.
To observe this chemical change, you can perform the following experiment:
1. Take a clean iron nail or any iron object.
2. Expose the nail to water and oxygen in the presence of air, preferably in a humid environment.
3. Over time, you will notice the iron nail starting to oxidize and form a reddish-brown substance called rust.
In this chemical change, the iron combines with oxygen to form iron oxide, which is a different substance with different properties than the original iron.
Remember, in a physical change, the substance undergoes a change in state or appearance, while in a chemical change, a new substance is formed with different properties.