Which Rare Earth Element are used in common electronic goods? Briefly explain the rare earth elements role. Which Rare Earth Elements are used in clean energy technologies? Briefly explain the rare earth elements role.

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.

The is a particle with one unit of positive charge a. proton b. positron c. electron d. nucleus awnser quick it is a important science test!

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5