LIFESAVER MANIA 2 LAB : THIS LAB IS NOT MEASURING FASTEST OR SLOWEST – IT IS MEASURING A CHANGE IN MASS!
REMINDERS ABOUT EACH STEP:
(2 pt) Concept
- Main Idea Scientific Method, Change of Mass
(2 pt) Question
- Which liquid, 20ml of ______or 20 ml of ______, will change the mass of a ____ lifesaver the most after fifteen minutes in the liquid? OR Which color of lifesaver, _____ or _____, will have the greatest change in mass after fifteen minutes in 20 ml of ______?
(2pt) Background Info
- Include things about the liquid(s) and lifesaver(s) that help you make a hypothesis:
example
Pepsi contains carbonated water (bubbles) Vinegar is an acid – will break down sugar Lifesavers contains lots of sugar
(2pt) Hypothesis
- based on the background info. Does not include "I think that..." Does include "because". The red lifesaver in 20ml of vinegar will have the greatest change in mass after 15 minutes because ______
(5 pt) Materials
- list everything used and how many of each
- EXAMPLE: -40 ml of ______
- -40 ml of ______
- -4 ______lifesavers
-
(10pt) Procedures
- # each step in list form, tell everything that you did! 1. Get materials
2. Put on goggles
3. Remove wrappers from lifesavers
4. Using an electronic balance, place one _____ lifesaver on pan. Record mass in grams on plastic bag and label plastic bag #1.
5. Repeat step 4 for the other 3 ______lifesavers and label plastic bags #2, #3, #4
WE DID THESE FIRST FIVE TOGETHER!! FINISH PROCEDURES – YOU WILL END UP WITH ABOUT 13-15 PROCEDURES TOTAL!
(2pt) Controls
- things that you kept the same
EXAMPLES
- All lifesavers stay in liquid(s) for 15 minutes
- All beakers contain same amount of liquid (20ml)
- All beakers are the same size
- Use same color lifesavers (red) OR Use same type of liquid (PEPSI) (THIS LAST ONE DEPENDS ON WHICH LAB YOU DID!!)
(2pt) Variables
INDEPENDENT - "What I chose to make different"
EXAMPLES - 2 different types of liquids (pepsi and vinegar) OR 2 different colors of lifesavers (red and green)
DEPENDENT - what happened (changed) because I chose different liquids or colors of lifesavers
EXAMPLE - CHANGE IN MASS OF THE LIFESAVERS
(2pt) Data Table
- include both quantitative (number values) and qualitative (sensory descriptive words) info.
(3 pt) Results
- One sentence for each trial - write out all words/numbers
EXAMPLE – In trial one, the red lifesaver in twenty milliliters of pepsi had a change in mass (loss) of one and one tenths gram after fifteen minutes.
(10 pt) Conclusion
- Include the lead in sentences A,B,C,D,E (must write all of these out!!)
A) My hypothesis was that ______because______.
My hypothesis was proven true/untrue because ______.
B) Some problems that we had with the lab were ______.
C) Some suggestions for improvement are ______.
D) This relates to real life ______.
E) My final thought is ______.
(8pts) GRAPH – Bar graph showing the difference in mass!
INDEPENDENT VARIABLE GOES ON THE X AXIS
DEPENDENT VARIABLE GOES ON THE Y AXIS
YOUR ORIGINAL QUESTION IS THE GRAPH TITLE
LABEL EVERYTHING!
BARS NEED TO REPRESENT DIFFERENCE IN MASS IN GRAMS
DON’T FORGET TO PUT THE ACTUAL DIFFERENCE ABOVE EACH BAR