Be sure to show work and label quantities. Useful constants

Heat of fusion (Hf): 334 J/g Heat of vaporization (Hv): 2260 J/g

Heat capacity (c) of solid water: 2.10 J/g˚C Heat capacity (c) of liquid water: 4.18 J/g˚C

150 kJ are transferred to a 150 g sample of water at 25ºC. What mass of water will evaporate?

Count the number of each type of atom in the equation below, and then balance the equation. write in the numbers of atoms and coefficients. add a 1 if there should be no coefficient. cs2(l) + o2(g) → co2(g) + so2(g) c [ ] s [ ] o > c [ ] s [ ] o [ ] cs2(l) + [ ] o2(g) > [ ] co2(g) + [ ] so2(g)

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?

Which substance—wood or silver—is the better thermal conductor? a thermal conductor is a material that requires very little heat energy to change its temperature. explain your answer.