Example of a physical change that has a colour change?
If you heat an iron bar until it glows red hot. the chemical composition is still the same but the silver iron bar changed to a red color
hope that helps:)
oh thanks
yea that's perfect what i needed
One example of a physical change that involves a color change is when you combine separate solutions of colorless substances to create a new colored solution. An illustration of this would be when you mix two clear liquids such as sodium hydroxide (NaOH) and phenolphthalein indicator.
To observe this color change, you can follow these steps:
1. Begin by obtaining a small amount of sodium hydroxide (NaOH) in a container.
2. Similarly, collect a separate container with a small amount of phenolphthalein indicator solution.
3. Take note that both the NaOH and phenolphthalein indicator solutions are initially colorless.
4. Now, combine the sodium hydroxide solution and the phenolphthalein indicator.
5. As soon as you mix the two solutions, you will observe a perceptible color change, as the mixture turns pink or magenta.
6. This color change indicates a physical change taking place in the solution mixture. The original substances haven't chemically reacted, but the interaction between them produces a new color.
Remember, it's always essential to exercise caution and follow proper handling and disposal protocols when working with any chemicals.