How could the appearance of a substance change with out it becoming a different substance

What is a mineral phase change? a. when a mineral melts from a solid state to a liquid state b. the exterior of a mineral weathers and changes color c. a mineral changes density because of the addition of water d.

A spherical balloon contains a positively charged object at its center. as the balloon is inflated to a greater volume while the charged object remains at the center, what does the electric potential at the surface of the balloon do?

What is the relationship between temperature and kinetic energy?

Which of the following is an example of voluntary muscle action? A) fingers typing on a keyboard B) pupils dilating in reaction to light C) the heart pumping blood through the body D) the stomach moving food to the intestines

What is the volume of 8.7 * 10 ^ 23 molecules of chlorine gas (Cl 2) ?

In an experiment to test a new drug's effectiveness, one group is given a larger dosage than is typically prescribed, and a second group is given a smaller dosage than is typically prescribed.

Waves move out through the ground from the source of an earthquake. True or false

The 14C content of a wooden harpoon handle found in the remains of an Inuit encampment in western Alaska is 61.9% of the 14C content of the same type of wood from a recently cut tree. How old is the harpoon?

What are the uses of crude oil?

Chemical formula for urea?