Gold has a half life of 7653Yrs. How many years would it take for 200g sample to be reduced to 25g?

Which statement correctly describes the interaction between magnetic poles? North and south poles attract each other. North and south poles repel each other. Two north poles will attract each other. Two south poles will attract each other.

Consider an atom of oxygen in which the nucleus contains 8 protons and 8 neutrons. If it is doubly ionized, what is the charge of the oxygen ion and how many electrons remain in the ion?

Why does an atom of sodium have a larger atomic radius than an atom of chlorine?

Despite the name, dry cleaning does involve the use of liquid solvents. why would a dry cleaner use both polar and nonpolar cleaning solvents

Estructura del Lewis del C 4+?

what will be the new volume of a 250mL sample of gas at 300 k and 1 atm if heated to 350 k at 1 atm law use:

Which statement describes the chemical property of oxygen

The reaction CH3NC? CH3CN is called an isomerization reaction andinvolves the breaking of a C-N bond and subsequent formation of a C-C bond-the reactant andproduct have the same molecular formulas and so are isomers.

Following my previous question: How is it possible for one substance to act both polar and non-polar? How is the polar/non-polar nature of a substance useful?

How is petrol separated from the mixture of hydrocarbons in crude oil?