Two bottles of gases are sitting on a shelf at 25c. bottle a contains hydrogen gas and bottle b contains helium gas.
a) in which bottle do the molecules of gas have the higher average kinetic energy?
b) in which bottle are the molecules moving faster (have a higher average velocity)?
c) if not the same velocity, by how much faster is the velocity of the gases?

How many total moles of ions are present in 0.0158 mol of nacl?

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.

When hydrochloric acid reacts with potassium hydroxide solution, the following reaction occurs. hcl (aq) + koh (aq) h2o (l) + kcl (aq) the reaction gives off heat energy, so it is an reaction.