Which electron configuration represents an

excited state for a potassium atom?

(1) 2-8-7-1 (3) 2-8-8-1

(2) 2-8-7-2 (4) 2-8-8-2

Air in a closed container with a fixed volume is heated from 25 c to 36 c if the pressure is initially at 3.8atm what would the final pressure be

A hot air balloon is filled with 15 moles helium gas and 5 moles nitrogen gas. What is the volume of the balloon at 1.01 atm and 300 K?

Which of these items best describes the arrangement of electrons in an atom of sulfur? A. Two electrons in its first energy level; eight electrons in its second energy level; six valence electrons in its outermost energy level B.

All the following conditions must be present for a fire to start except A. nitrogen to support the fire. B. a heat source (such as a spark). C. fuel (such as wood or gasoline). D. oxygen to support the fire.

The process in which water changes its potential energy to kinetic energy as it moves from upstream to downstream is called load affect. T or F

Enter a chemical equation for LiOH (aq) LiOH (aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely. Express your answer as a chemical equation.

Percent copper in brass lab

Which statement best describes Rutherford's model of the atom?

If a net force of 5.0 forward acts on a 0.60 kg toy car, what is it's acceleration?

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water? boiling freezing chromatography sorting