Which one of the following is a balanced equation? a. 2ca (s) + o2 (g) → 2cao (s) b. 6ca (s) + 2o2 (g) → 6cao (s) c. 4ca (s) + o2 (g) → 2cao (s) d. 6ca (s) + 4o2 (g) → 2cao (s)

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign

How is the atomic number of a nucleus changed by alpha decay

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?