A substance undergoes a change.

Which statement indicates that the change was a chemical change?

Describe how electrons are shared in each type of bond. write equally or unequally

Scientists often have to deal with numbers that are either very large or very small. For example, the radius of the Sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 * 10-4 millimeters.

Why does a solution mix itself?

Energy is added in the form of heat to a pot of water on the stove. This causes the water to A) decrease kinetic energy. B) increase kinetic energy. C) decrease potential energy. D) increase potential energy.

A vapor is which state of matter? a. solid b. liquid c. gas d. all of the above

In the reaction Mg (s) + 2HCl (aq) H2 (g) + MgCl2 (aq), how many grams of hydrogen gas will be produced from 125.0 milliliters of a 6.0 M HCl in an excess of Mg

An element has an atomic number of 92 and a mass number of 234, how many neutrons are there?

What energy is a quarterback's arm before throwing a pass

Which atom can accommodate an octet of electrons but doesn't necessarily have to?

Heat is an exchange of internal energy from one system to another due to A. a temperature difference between the systems. B. one system being gas and the other being solid. C. the systems having the same temperature. D.