Dalton used the lightest element as his standard for atomic mass. What is this element?

A. Hydrogen

B. Carbon

C. Oxygen

D. Nitrogen

If you were asked to convert 4.2 * 1022 atoms of aluminum to moles, which of the following should you use for the conversion?

How can scientists know what happened millions of years ago if no one was there to see it?

When an atom of phosphorus becomes a phosphide ion (P3-), the radius decreases, increases or stays the same?

Empirical formula for h2SO4

Which statement is true? -The earth has a stronger gravitational pull than the Sun because it is smaller in mass. -Planets would travel in a straight line if it weren't for the force of the Sun's gravity.

What are the cations and anions for V2 (CO3) 3

If you were asked to convert 4.2 x 1022 atoms of aluminum to moles, which of the following should you use for the conversion?

Carbonic acid (H2CO3) does not dissortate 100 percent in water. What type of substance is it? weak acid Strong base strong acid weak base

The standard enthapy of combustion of solid urea co (nh2) 2 is - 632kjmol-1 at 298k

What happens to an isotopes during radioactive