45. most abundant metal in the earth's crust

46. first discovered in light coming from the sun

Which scientist observation eventually led to the theory of continental drift

According to modern atomic theory, it is nearly impossible to determine an electron's exact?

Pressure and volume are inversely related. When the pressure on a gas is doubled, what happens to the volume

Which of the following bond types is normally the weakest? A) sigma bond formed by the overlap of two porbitals B) sigma bond formed by the overlap of two sorbitals C) pi bond formed by the overlap of two porbitals D) sigma bond formed by the

What kind of decay cause neptunium - 238 to form from uranium - 238

Given the generic chemical reaction below write the rate of the reaction

23 For a reaction at equilibrium, which change can increase the rates of the forward and reverse reactions?

If the formula for potassium chlorate is KClO3 and the formula for magnesium fluoride is MgF2, then what isthe formula for magnesium chlorate?

How can you tell if a chemical reaction has occurred?

An engineering team is conducting a trial launch of a new rocket. Which part of the engineering process is the team in?