Since 2000, there have only been five reported cases of this once deadly childhood disease in the United States: diphtheria. Today, children are vaccinated before they attend school for this disease.

A)
amoebic

B)
bacterial

C)
spirochete

D)
viral

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

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?