Which type of change can be reversed?

A.) a physical change

B.) a chemical change

C.) a molecular change

D.) an electric change

5.4*10^3 * 1.2*10^7

Reactions between atoms occur when: an atom seeks to fill its outer shell of electrons an atom seeks to balance its positive and negative charges the reaction will result in paired electrons

If cats take over the world, will you make them extinct or be their slave.

Assuming all orbitals are in the same energy level which type of orbital has the lowest energy

A primary source of hydrocarbons is:

Which civilization formed a confederation thay may have impacted the us government A. Powhatan B. Algonquian C. Iroquois D. Anasazi

Jasmine breathed against the window pane and noticed that her breath made a spot on it from the water vapor in her breath. Which stage of the water cycle does this show? A. precipitation B. evaporation C. condensation D. transpiration

Amber has developed a line of organic lotions and handmade soaps with unique, herb-based scents and a touch of bee balm. She plans to sell these products to the wealthy residents of a nearby resort town.

Two pure elements react to form a compound. One element is an alkali metal, X, and the other element is a halogen, Z. Which of the following is the most valid scientific claim that can be made about the compound? a. It has the formula XZ2 b.

Are protons positive and neutrons neutral