If two gases are present in a container, the total pressure in the container is equal to a. the sum of the pressures that are exerted by each of the two gases. b. twice the sum of the pressures that are exerted by the individual gases. c. the sum of the pressures that each gas would exert if they occupied twice the volume. d. the sum of the pressures that each gas would exert if they occupied half the volume.

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.

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Consider the reaction: n2(g) + o2(g) ⇄ 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?