Question

which of these is an example of a physical change?
mixing oil and vinegar
adding pasta to your water, but not turning on the heat
all of these
making a salad

Explanation:

A physical change is one where the form or appearance of a substance changes, but not its chemical composition. Mixing oil and vinegar just combines two substances physically without a chemical reaction. Adding pasta to water without heating is also a physical combination. Making a salad involves combining different food items physically.

Answer:

C. ALL of these