Which temperature represents the highest average kinetic energy of the particles in a sample of matter ?
a) 298 k
b) 267 k
c) 27 degrees celsius
d) 12 degrees celsius

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

Compare and contrast physical changes with chemical changes.

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