study guide

5. variable that changes
6. a combination of different things that cannot chemically bond (like a cookie)
8. reason why planes are built with an alloy (aka made to last)
9. used to date the clothing of mummies
10. number of electrons in an element
12. number 14 on the pH scale
13. keeps everything the same to use as a comparison
15. educated guess
18. doctors and scientists use this
19. made up of one kind of particle (like water)

1. data using numbers
2. data using adjectives like colors or height
3. was found using gold foil experiment
4. variable that stays the same
7. graph that shows change over a period of time
8. acid used to digest food (pH level 1)
11. graph to compare measurements of time or items
14. pure form of an element like gold or diamond (typically mixed with rock)
16. chart used to graph percentages
17. the last step of the scientific method (when research has been completed)