valance refers to the total number of electrons that exist in the orbitals that occupy the outermost energy level of an atom

Which method would be best to separate a mixture of oil and vinegar? - separation by filtration - distillation - separation by density - screening

What is the mass of one mole of nitrogen atoms?

Explain how condensation is invovled in the water cycle

72.3 g of ice at - 15.0oC has heat energy added to it until it becomes steam at 145oC. Calculate the total amount of heat energy needed (in Joules) to accomplish this.

What is a possible explanation of a phenomenon that can be supported or disproved through a set of carefully

What is the mole fraction, x, of solute and the molality for an aqueous solution that is 16.0 % NaOH by mass

What is the square root of 54554? What is the square root of 35654?

Halogens have ... Electron affinity

Observe: Change the Surface area from Minimum to Maximum. You can imagine that a solid reactant has been dissolved in a liquid. How does this change how many Reactant B molecules are exposed to Reactant A?

When placed in a 200-mL square box, a substance has a spherical shape and has a volume of 75 mL When placed in a 200-mL circular tube, the same amount of that same substance has a spherical shape and a 75-mL volume.