draw one enantiomer of the major product of the diels–alder reaction shown. use wedged and hatched bonds to indicate the orientation of substituents in the product. chirality centers must contain four bonds in order to be graded correctly. hydrogen atoms on chirality centers must be shown.

As you move from right to left on the periodic table the atomic radius fill in the blank

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

What determines the average kinetic energy of the particles in a gas? a. the number of collisions b. the number of particles c. the size of the particles d. the temperature