Which is an example of a chemical change?

a) frying an egg
b) boiling water
c) melting butter
d) chopping onions

What are similarities and differences of reflection, refraction, diffraction and absorption?

Determine the force the sun exerts on an object with a mass of 80.0 kg if that object is on the earth. what is the force exerted by the moon on the same object? what is the force the earth exerts on it?

You are standing on a boat. which of the following strategies will make the boat start moving? a. pushing the mast b. throwing some cargo out of the boat c. pushing the front ofthe boat d. pushing another passenger