An atom has three full orbitals in its second energy level.

How many electrons are present in the second energy level of the atom?

6

12

3

9

A mixture of gaseous reactants is put in to a cylinder, where a chemical reaction turns them in to gaseous products. The cylinder has a piston that moves in or out as necessary to keep a constant pressure on the mixture of 1 atm.

A 0.72-mol sample of PCl5 is put into a 1.00-L vessel and heated. At equilibrium, the vessel contains 0.40 mol of PCl3 (g) and 0.40 mol of Cl2 (g).

What does the enthalpy of reaction measure? O A. The amount of energy required to raise the temperature of a substance O B. The amount of energy required to make a chemical reaction happen O c.

What is the mass of 0.100 mole of neon? (Watch sf's)

A walkman uses a current of 2.0 A and has an internal resistance of 3.0 Ω, how many 1.5V batteries are required?

Hanna hypothesizes that granite is denser than sandstone. How can Hanna test her hypothesis?

It is possible to determine the environment of sedimentation for various sand dunes by

Which change results in the formation of different substances? (1) burning of propane (2) melting of NaCl (s) (3) deposition of CO2 (g) (4) solidification of water

Suppose that a solid cube of some material floats on the surface of an oil puddle at a service station with 75.1 % of its volume submerged. The density of the oil is 923 kg/m 3. What is the density of the cube's material

What is modern periodic table?