What has 20 electrons in 44 Mass

interactions between substances can produce chemical or physical changes which of the following describes a chemical change

For: rate=k[A]^x determine the value of x if the rate doubles when [A] is doubled; and if the rate quadruples when [A] is doubled.,

T Why don't the present shapes of the continents fit perfectly into a supercontinent

2. What is the electron configuration of an electrically neutral atom of magnesium?

Number of molecules in nh3

When 12.4 grams of KBr are dissolved in enough water to create a 170-gram solution, what is the solution's concentration, expressed as a percent by mass?

The Bohr theory can be extended to non-hydrogen one electron ions such as He + and Li2+, in which case the energy depends on the different atomic numbers Z for the respective atom.

Each day the earth spins on its axis. this is known as what?

Is Fe a element or a compound? Is Aluminum a element or a compound? Is HCI a element or a compound? Is Hydrogen Peroxide element or a compound? Is H2 element or a compound? Is NaOH element or a compound?

Which of the following chemical reactions is an oxidation-reduction reaction? Answer WO3 + 3H2 W + 3H2O KNO3 + LiCl LiNO3 + KCl CaSO4 + 2NaCl Na2SO4 + CaCl2 Mg (NO3) 2 + 2HBr MgBr2 + 2HNO3 According to the collision theory and model created to