Which sample of matter is a mixture?
(1) br2(ℓ) (3) kbr(s)
(2) k(s) (4) kbr(aq)

Which of these features are formed when hot groundwater is forced out through cracks in the earth's surface?

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?

What happens to the concentration of hydronium ions as the ph of a solution increases? a. hydronium ion concentration stays the same b. hydronium ion concentration decreases c. hydronium ion concentration increases