Two different isotopes of the same element have : (true/false)

- Equal nuclear charges

- Similar radioactive decay properties

- Equal mass of an atom

- Different number of neutrons

- Equal mass of a nucleus

Our sun is A) a very small star. B) a very large star. C) a medium-sized star. D) not actually a star at all.

Why was Becquerel's experiment a first step in discovering radioactivity?

Addition of 1 M HBr to 0.1 M solutions of which compound results in evolution of a colorless gas? (A) NaHSO3 (B) NaHSO4 (C) Ce (NH4) 2 (NO3) 6 (D) KBrO3

In an effusion experiment it required 40 s for a certain number of moles of a gas of unknown molar mass to pass through a small orifice into a vacuum. Under the same conditions 16 s were required for the same number of moles of O2 to effuse.

How much carbon dioxide in kilograms is produced upon the complete combustion of 29.4 L of propane (approximate contents of one 5-gal tank) ? Assume that the density of the liquid propane in the tank is 0.621 g / mL.

What is the primary cause of global wind patterns on earth?

What is the central argument about global warming

How many mL of a 4.50M NaBr solution are needed to make 250 mL of a 0.75M solution of NaBr?

Calculate the density of propanol c3h8o if you know that there are 1.069*1025 molecules of propanol in 1.35 l.

Why electrons are transferred during the course of the reaction between magnesium and oxygen?