1. Bellwork: Fri. Aug. 18, 2017 Do You Know the Metric Base Unit for???
base unit for time: __________
base unit for mass: __________
base unit for length: _________
base unit for volume:__________

2. Metric Base Units
base unit for: time: second
base unit for mass: gram
base unit for length: meter
base unit for volume: liter

3. Notes:
Graphs: used in science to show comparisons, patterns, trends, and relationships in data.

6. Yes, we know, this is not Math Class….
But scientists still need to work with the numbers they collect in their experiments. What is this type of numerical data called?

7. Graphing Quantitative Data:
Numerical data is graphed to help it make sense to scientists.
Two sets of numerical data are put on a line graph or a scatter plot

9. LINE GRAPHS show trends, especially over time, in data.
SCATTER PLOTS let us see relationships in data.

10. Sometimes
The data is not numerical, (quantitative) but descriptive in nature
What is this type of descriptive data called?

11. Graphing Qualitative Data:
This is most often done with Bar Graphs
BAR GRAPHS are used to compare data

12. Sometimes scientists have one set of numerical (quantitative) data and one set of descriptive
(qualitative) data =
Bar Graphs
To graphically create
A picture of the data

13. All graphs have some things in common:
independent variable: plotted on the X-axis. Label Units!
dependent variable: plotted on the Y-axis Label units!
Units of measurement must be included!
Scales & intervals must be appropriate to the data
Must have a Title to describe the data

15. How to make these graphs
Go to word doc of notes….

16. What was the dependent variable?________________ pH
tadpoles #
8.0 45
7.5 69
7.0 78
6.5 88
6.0 43
5.5 23
What was the dependent variable?________________
What was the independent variable? ______________
What is the average pH in this experiment? __________
What is the average number of tadpoles per sample? __
What is the best water pH for tadpole development? ____
Between what two pH readings is there the greatest change in tadpole number? _________________
How many tadpoles would we expect to find in water with a pH reading of 5.0? ________________

18. END

19. Old slides

20. How Smart Are Animals? http://video.pbs.org/video/1777525840
Think about the experiments these scientists are doing to test animal intelligence.
What are their independent and dependent variables in each animal “experiment?”
What do they do to make sure they are getting accurate results?

21. How the Milk Experiment worked:
Milk is mostly water but it also contains vitamins, minerals, proteins, &tiny droplets of fat suspended in solution. Fats and proteins are sensitive to changes in the surrounding solution (the milk).
The colors swirl due to the chemistry of the drop of soap - its bipolar characteristics (nonpolar on one end and polar on the other), weakens chemical bonds holding the proteins and fats in solution. The soap's polar, or hydrophilic (water-loving), end dissolves in water, & its hydrophobic (water-fearing) end attaches to a fat globule in the milk.
The molecules of fat bend, roll, twist, & contort in all directions as soap molecules race around to join up with fat molecules - so the food coloring molecules are bumped and shoved everywhere, providing an easy way to observe all the invisible activity. As the soap is evenly mixed with the milk, the action slows & eventually stops.