Choose the word from the drop-down menu that completes each sentence. AlAn

star system is made of two stars.

A/An

star system is made of no more than a few thousand stars.

AlAn

star system is made of more than a million stars.

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

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

Displacement is the slope of a velocity vs. time graph a. true b. false