Exercise Answers: Module 11

Scientific Notation

1. Earth’s mass is larger because it’s a -digit number and Mars’ mass is a -digit number, but it might take a lot of work counting the zeros to be sure.
2. Earth’s mass is about ten times larger, because the power of is higher than that of Mars.
3. A chlorine atom’s radius is larger because it has zeros before the significant digits begin, but a hydrogen atom’s radius has zeros before the significant digits begin. As above, counting the zeros is a pain in the neck.
4. The chlorine atom has a larger radius because its power of is higher than that of the hydrogen atom. (Remember that is larger than because is farther to the right on a number line.)
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17. the proton’s mass is roughly or times larger
18. kg
19. kg
20. ;
21. ;
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