what is the half life isotope if after 21 days you have 31.25 g remaining from a 250.0 g starting sample size?

Instructions:Type the correct answer in each box. Use numerals instead of words. A scientist identifies a particular atom as an atom of chlorine. The scientist also determines that the atom has no net charge.

How many acids are there

5. How many molecules of water are there in 8.050 x 10 grams of water?

If 6.1 moles of copper react completely with 6.1 moles of oxygen, what is the mole ratio for the compound

In the human body, a series of chemical reactions results in the making of energy that is used at both the cellular and organismal levels.

How many valence electrons are available for bonding in silicon

Which statement best explains why objects are pulled toward Earth's center? Earth has a magnetic force that is strongest at its core. Earth has a much greater mass than objects on its surface.

How is the sun related to nuclear electromagnetic and heat energy

How many moles are im 8.31x1023 molecules of h2so4

Cuales son otras sub particulas atomicas que presenta el atomo