Select the star life cycle that is accurate. A. Nebula, white dwarf, star of one stellar mass, red giant, planetary
nebula
B. Nebula, star of seven stellar masses, red supergiant, supernova,
black hole
C. Nebula, star of one stellar mass, supernova, black hole
D. Star of three stellar masses, white dwarf, nebula, black hole

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

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?

Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0.271 s−1. part a part complete what is the half-life for this reaction?