Three students are asked to discuss the percent error obtained from this lab and explain some sources of error that would account for the discrepancy
seen, if any. Select the student that employs correct scientific reasoning.
• Student 1: If the reaction was not allowed to go to completion, the sodium bicarbonate would
not have fully decomposed, making the final mass higher than the theoretical.
Student 2: If the baking soda was not heated long enough, the final mass of solid product would
be low
Student 3: The student didn't weigh the masses correctly therefore human error is the main
source of discrepancy.
.
O Student 1
O Student 2
OStudent 3

The earth's moon is unusually large. two popular theories of the moon's origin include the "sister world" hypothesis, which states that the moon formed from the same materials as the earth, near enough to the earth that they fell into orbit around each other. a second theory is the "capture" hypothesis, in which the moon formed elsewhere in the solar system, and the earth's gravity pulled it into its orbit. studies of what the moon is made of indicate that some of its materials had to come from the earth or from the same area of the solar system where the earth had formed. at the same time, the moon does not contain much of the material that makes up the earth's core, so the moon could not have formed from the same materials as the earth. how do the two facts above affect the described theories of the moon's origin? a. they show that scientists will never agree on where the moon came from. b. they show that more experiments on moon formation need to be done. c. they show that no theory accounts for the existence of the moon. d. they show that neither theory is complete and entirely correct.

All of the following are part of the biosphere except

Ais a mountain created from eruptions of lava, ash, rocks, and hot gases.