Which portion of the electromagnetic spectrum can human eyes detect?

A rock contains uranium 238 which has a half life of 4.5 billion years. if the rock is crushed and heated, the half life in urainium-238 will

What is the atomic number of a sodium atom that has 11protons and 12 neutrons.

Suggest a mechanism that is consistent with a second order rate law

Which statements describe the law of conservation of charge? Check all that apply. A. The total charge of the reactants and products must be equal. B. The net charge of an isolated system remains constant. C. The number of nucleons is constant. D.

A gas has a volume of 6.6 L at a temperature of 40 C. What is the volume of the gas if the temperature changes to 15 C?

Why is hydrogen not considered part of any group

What type of plate boundary is near mount manaro

All the following are signs of chemical reaction may have taken place in a piece of glass except: A. glass changes colors B. new substances beside glass are form C. shape of glass changes D. energy is used or given off

Which of the following does NOT show the law of conservation of mass? A. 24 g of Mg burn in 32 g O2 to produce 56 g of MgO. B. 24 mL of Mg burn in 32 mL O2 to produce 56 mL of MgO. C.

Calculate the percent activity of the radioactive isotope iridium-192 remaining after 2 half-lives.