The use of more advanced tools made of stone, wood, and bone, such as the ones illustrated below, was typical of which period of human history?

a. Paleolithic era

b. Neolithic era

c. Bronze Age

d. Iron Age

Write a short report describing the Montreal Protocol and more recent environmental measures to reduce CFCs.

A solid and a liquid are shaken together in a test tube to produce a uniform liquid that does not separate into layers.

Suppose of potassium iodide is dissolved in of a aqueous solution of silver nitrate. Calculate the final molarity of iodide anion in the solution. You can assume the volume of the solution doesn't change when the potassium iodide is dissolved in it.

In which substance does chlorine have an oxidation number of + 5?

How many moles are in 65 g of carbon dioxide (CO2) ?

a solution is approximately 332.0 g of salt per kilogram of solution. Assume this salt is all NaCl. What is the molality of this solution?

What burns fuel to release thermal energy

Scientist call an organism that has two different alleles for a trait

The molar mass of water (H2O) is 18.02 g/mol. Yun needs 0.025 mol H2O for a laboratory experiment. She calculates that she needs 72.0 g H2O for the experiment. Yun's calculation was incorrect because she set up her unit conversion incorrectly.

I'm doing isotope homework and I need the find the number of protons, neutrons, and electrons first one is chromium-58 and chromium-63