The earliest known human ancestors are believed to have lived 3 billion years ago. True or False

How many moles are there in 25.0 g of sodium?

How is vapor pressure related to the temperature of liquid? A: Not B: Inversely C: directly

A certain radioactive material has a half-life of 36 minutes. Starting with 10.00 grams of this material, how many grams will be left after 2 hours? A) 1.00 grams B) 1.5 * 10-4 grams C) 3.33 grams D) 0.25 gram

An atom of iron-56, 56Fe, contains? A.) 26 electrons, 26 protons, 56 neutrons. C.) 26 electrons, 26 protons, 30 neutrons.

What example show the transformation for electrical change to radiant?

Choose all of the statements that correctly describe the movement of particles when thermal energy is added or removed. A) The addition of thermal energy to a gas will increase the chance the particles will collide.

Which is a non renewable resource that is used to generate electrical energy

How many grams of sulfur (S8S8) must be dissolved in 100.0 g naphthalene (C10H8C10H8) to make a 0.11 mm solution

Mason compare the properties of two compounds magnesium oxide is an ionic compound and hydrogen peroxide is not an ionic compound there for both compounds most likely

Cisplatin is synthesized as follows: K2PtCl4 (aq) + 2NH3 (aq)  Pt (NH3) 2Cl2 (s) + 2KCl (aq) What mass of cisplatin can be made from 100. g of K2PtCl4 and sufficient NH3? What mass of KCl is also produced?