Which nuclides are used to date the remains of a once-living organism?

(1) C-14 and C-12 (3) I-131 and Xe-131

(2) Co-60 and Co-59 (4) U-238 and Pb-206

Why use absorption spectra not emission to identify gas?

A person who is interested in the role of genetics in health might pursue a career in A) endocrinology B) gene therapy C) neuroscience D) sports medicine

What is the oxidation number of nitrogen in hno2?

demonstration of strong electrolytes, weak electrolytes, and nonelectrolytes, Professor Popsnorkle used a lightbulb apparatus that showed how much a solution conducted electricity by the brightness of the lightbulb.

Water is a compound that can be broken down into hydrogen gas and oxygen gas. However a mixture of hydrogen gas and oxygen gas looks and behaves nothing like water. Why?

Suppose 30 grams of NaCl are placed in 900 mL of water. What is the molarity of this solution?

After a particularly cold day outside you go home to make some tea. you heat the water in the mug so that botch are about 75 degrees celcious. the tea bag is only 30 degrees celcious and the room is around 26 degrees celcious.

For main-group elements using the older numbering system the group number on the periodic table corresponds to which characteristic of the elements of that group

In the vertical columns of the periodic table, as the atomic numbers increase: a. the number of electron shells increases. b. the ionization energies increase. c. the number of electrons in the valence shell increases. d.

Which of the following solutions contains the largest total concentration of ions, assuming complete dissociation .010 M aluminum chloride .010M sodium chloride .010M aluminum sulfate .010M calcium chloride