CH3 H2C=C-COOH + CH3-CO-SH CH3 ☑COOM COOH CH3-CO-S-HỌC-CH-COC 22.7.2 CH3 SOCI2 CH3-CO-S-H2C-CH-COOH 22.7.1 NH3/CH3OH N COOH CH3-CO-S HỌC CHEO -CH- 22.7.3 'N' COOH H-S-H2C-CH-CO 22.7.4 -CH CH3 CH3

When a hot piece of copper touches a cold piece of copper, which direction will heat transfer and why? Heat transfers from the hot piece to the cold piece because it is more probable that the heat would transfer because there are more arrangements possible for the quanta of energy when spread out across both pieces of copper. O Heat transfers from the hot piece to the cold piece, because once the quanta of energy have spread out across both pieces o metal, they will not go back to their initial arrangement. O Heat transfers from the cold piece to the hot piece because it is more probable that the heat would transfer because there are more arrangements possible for the quanta of energy when most of the quanta are on the hot piece. O Heat will not transfer between the pieces.

g See Periodic Table The flame in a torch used to cut metal is produced by burning acetylene (C₂H₂) in pure oxygen. Assuming the combustion of 1 mole of acetylene releases 1251 kJ of heat, what mass of acetylene is needed to cut through a piece of steel if the process requires 66.2 x 104 kJ of heat? 4 See Hint

6. Explain the direction in which heat energy will flow in the picture shown to the left.