Question

SCIENCE HELP PLEASE! 10 POINTS

11. Why did we drop the pumice and obsidian in two glasses each, instead of just one each?
12. In an IF, THEN statement, after which word do you usually find the independent variable? What is an independent variable?
13. In an IF, THEN statement, after which word do you usually find the dependent variable? What is a dependent variable?
14. What was the independent variable in the rock density experiment?
15. What was the dependent variable in the rock density experiment?
16. What is a control? Was there a control in this experiment?
17. When does data collection take place?
18. Was the data collected in this experiment quantitative or qualitative data? How do you know?
19. Why is background research important?
20. What should a scientist do if their hypothesis was rejected, or disproven?
21. Put these items in order from greatest to least density. Water, Pumice, Obsidian.

Answer 1

11. Unanswerable without more information
12. The independent variable is usually after IF. e.g. "If I increase the temperature in my freezer (independent, I change it), then my ice cream will melt (dependent, I didn't make it happen directly).
13. I feel like that's answered above. :)
14. Unanswerable without more info.
15. (see above).
16. A control is something you leave alone, don't apply the independent variable to (likely there was a control in this experiment, but I have no way to be sure).
17. Data collection should take place during the experiment.
18. (see 15)
19. Background research lets us make educated hypotheses and develop procedures that won't injure us or damage our results.
20. If a hypothesis is rejected or disproven, a scientist develops another one.
21. Pumice floats on water, while obsidian sinks. So, obsidian, water, pumice.

Hope that helped!