What contribution to atomic theory resulted from Albert Einstein's work? O A. A new understanding of what caused some elements to be
radioactive
B. A new model of the atom that described electrons as being in a
cloud
C. The discovery that different numbers of neutrons produced
isotopes
O D. A new understanding that the nucleus contained protons and
neutrons

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.

Which are forms of frozen water? check all that apply. dew frost hail rain sleet

What are the two largest greenhouse gases