When we calculate how much energy is needed to break a chemical bond, it makes a difference if we are talking about a single molecule in a vacuum, or lots of molecules contained in a fluid. The latter situation is more realistic and less abstract, but also requires that we consider not just the energy to break the bond, but the energy required to "deal with" the environment. If, for example, as is common in chemistry (or biology), a reaction takes place at a constant pressure and temperature, then the energy we put into the reaction is used not only to break apart bonds but also to do work – the volume must be increased to make room for the additional particles that are created so the pressure remains constant. This is why we might use enthalpy as our energy needed to cause a reaction rather than just the energy needed to break the bond itself: enthalpy also includes the amount of energy required to change the volume, i. e., the work. The energy needed to simply pull the

If you touch a hot light bulb and get burned, that is an example of a. radiation b. convection c. conduction

While listening to operatic solos, musicians process the lyrics and the tunes in separate brain areas. this most clearly illustrates the functioning of different

Jason and mia are both running in a race. as they approach the finish line, you being the physicist that you are decide to time how long it takes them to reach the end of the race. when you start your stop watch (you can take this as time t = 0 s) you notice that mia is an unknown distance d ahead of jason and both are moving with the same initial velocity v_0. you also notice that jason is accelerating at a constant rate of a_j, while mia is deaccelerating at a constant rate of -a_m. jason and mia meet each other for the first time at time t = t_1. at this time (t = t_1) jason's velocity is two times that of mia's velocity, meaning v_j (t_1) = 2v_m (t_1). a) draw the position vs. time graph describing mia's and jason's motion from time t = 0 to time t = t_1. clearly label your axes and initial conditions on your graph. b) draw the velocity vs. time graph describing mia and jason's motion from time t = 0s to time t = t_1. clearly label your axes and initial conditions on your graph. c) how long from when the stop watch was started at t = 0s did it take mia and jason to meet? express your answer in terms of know quantities v_0, a_m, and a_j. d) when the stop watch started at time t = 0s, how far apart, d, were mia and jason? express your answer in terms of know quantities v_0, a_m, and a_j.