A sample of phosphorus-32 has a half-life of 14.28 days. If 55 g of this radioisotope remain unchanged after approximately 57 days, what was the mass of the original sample?

A student measures the mass of a beaker filled with corn oil. the mass reading averages 215.6 g. the mass of the beaker is 110.4 g. a. what is the mass of the corn oil? b. what is the density of the corn oil if its volume is 114 cm3?

A 0.250 M solution of HCN has a pH = 4.87. a) Determine the [H3O+] in the solution. b) Calculate the percent ionization of HCN in this solution.

Why does light that passes through our windows at home not display the beautiful colors

This map shows the ages of the Atlantic oceanic crust

What is the primary buffer in the plasma?

Which is measured using a calorimeter

5) Solid lithium metal is added to an aqueous solution of magnesium chloride forming lithium chloride solution and solid magnesium a. If you begin the reaction with 15.0 g of lithium and 25.

Which element easily loses one electron to form a positive ion? A. Magnesium (Mg) B. Lithium (Li) C. Nitrogen (N) D. Fluorine (F)

What is an indication a chemical reaction has occurred? A.) Formation of gas B.) Boiling of a substance C.) Melting of a substance D.) Freezing of a substance

A saline solution contains 1.6 % NaCl by mass. How much NaCl is present in 57.2 g of this solution?