A crossed aldol reaction was conducted under heated conditions. An NMR experiment of the reaction mixture was then performed and indicated the presence of both the addition and condensation products, as well as both unreacted starting materials. Select the two peaks that would be the best diagnostics signals representing the starting materials. Hint: You should perform a retrosynthetic analysis to determine what the starting materials are before looking at the NMR spectrum.

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Consider the following reaction at equilibrium. 2co2 (g) 2co (g) + o2 (g) h° = -514 kj le châtelier's principle predicts that the equilibrium partial pressure of co (g) can be maximized by carrying out the reaction a. at high temperature and high pressure b. at high temperature and low pressure c. at low temperature and low pressure d. at low temperature and high pressure e. in the presence of solid carbon