ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST Rhenium(Re) is made up of 37.4% 185Re and 62.6% 187Re.
The atomic mass of 185Re is 184.953 amu. The atomic mass of 187Re is 186.956 amu.
What is the average atomic mass of rhenium?

186.00 amu
186.207 amu
186.397 amu
187.00 amu

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

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

What energy conversion occurs when a sling shot is used to shoot a rock across the room? (2 points) question 2 options: 1) stored mechanical energy is converted to mechanical energy. 2) stored mechanical energy is converted to radiant energy. 3) gravitational energy is converted to radiant energy. 4) gravitational energy is converted to mechanical energy.