It is important to be careful when using non renewable resources because a. there is a limited supply of them and we can't make any more. b. harnessing their energy is a very dangerous process. c. they are more likely to produce excess thermal energy that we can't use. d. there is a possibility of finding dinosaur bones in petroleum or coal deposits

Motivation cannot be developed with practice; a person either possesses it or they do not.

Provide a stepwise curved arrow mechanism that fully explains the outcome of the reaction shown below. oh нао* heat он

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