Using the standard molar entropies below, calculate the standard entropy change, δs∘ , for the “water-splitting” reaction at 298 k: 2h2o(l) → 2h2(g) o2(g) standard molar entropies of selected substances at 298 k substance s∘ (j/mol⋅k) h2(g) 130.6 o2(g) 205.0 h2o(g) 188.8 h2o(l) 69.9

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you

Examine the equation. 23490th→23088ra+42he what kind of barrier would you need to block the radioactive particles from this reaction? a.a piece of paper b.a sheet of aluminum foil c. a two-inch block of lead d. a solid concrete block

What is the measurement of how fast an object moves relative to a reference point?