QUESTION 7 The directions on a package of brownies call for cooking the batter at 350. OF. What is this temperature in K? (K = C + 273, F= 1.8 C + 32) 623 K O 450. K 177 K O 77 K QUESTION 8 What is happening during the plateaus in a heating curve or cooling curve? A physical state change is taking place during the flat parts of the graph. The plateaus of the graph are where no real changes are taking place. The substance has become locked into a certain physical state. No heat is being added or removed at these points in the graph so the temperature is not changing.QUESTION 9 How many calories of energy must be absorbed to completely melt 11 kg of ice? (Heat of fusion of water = 80. cal/g, at 0C) 8.8 x 102 calories 6.1 x 10 calories O 6.1 x 10 calories O 8.8 x 10 calories