Sara mixes white and red paint together. She says that the colour changed to pink, so there must have been a chemical change.Explain why she is incorrect.

Sara is incorrect in saying that the color change to pink indicates a chemical change. Here’s why:

1. Definition of Chemical Change: A chemical change involves a process where substances react to form new substances with different chemical properties. This often involves breaking and forming of chemical bonds, resulting in new molecules.

2. Definition of Physical Change: A physical change, on the other hand, involves a change in the physical properties of a substance without altering its chemical structure. Mixing substances without changing their chemical identity is a physical change.

3. Mixing Paints: When Sara mixes white and red paint, she is combining two substances to form a mixture. The individual molecules of the white and red paint do not change their chemical structure; they simply disperse among each other.

4. Color Change: The color change to pink is a result of the physical mixing of the pigments in the white and red paint. The pigments blend to produce a new color, but no new chemical substances are formed.

5. Conclusion: Therefore, the change in color to pink is due to a physical change, not a chemical change. The paints retain their original chemical properties, and no new chemical bonds are formed or broken in the process.

In summary, the mixing of white and red paint to produce pink is a physical change, not a chemical change.