Base units

1. Base units • Mass – gram • Temperature- ° Celsius • Time –seconds, minutes • Length – meter • Area – meters2 • Volume – meters3, liter

2. Warm up/practice • 78 g = __________ mg • 25 g = __________kg • 578cm = _________m • 456 m = __________km • 500 mL = ________L

3. What characteristics do most scientists share? • Why is measurement important in science?

4. Warm up • What is “scientific inquiry?”

5. Myth busters • {They provide an example of doing science.} • They choose a myth • Background information • Hypothesis • Design test, observe, collect data share

6. Warm up • When do you use scientific inquiry in your life? (Outside of science class)

7. experiment • Orange – 27°C, vita water • Purple - 17°C, cranrasberry • Water - 22°C, water • Hypothesis – cranrasberry will have the most “food” for the yeast – yeast disappears, most inflated balloon

8. design • Does temperature affect yeast behavior? • Hot – 85°C • Warm - 27°C • Cold – 16 ° • 150 mL water • 10 mL sugar • 15 mL yeast

9. Design HR 227 • Hypothesis is warm with lots of sugar will show the most yeast growth. • 65°C, 150 mL water, 9 mL of yeast, 1 spoon of sugar • 65°C, 150 mL water, 9 mL of yeast, 2 spoons of sugar • 65°C, 150 mL water, 9 mL of yeast, 4 spoons of sugar

10. Hr 228 - Design • Which sweetener will yeast grow best in? • 150 mL water, 10 mL yeast, nothing • 150 mL water, 10 mL yeast, sugar • 150 mL water, 10 mL yeast, sweet’n low • All at 30°C

11. Design HR229 • Hypothesis - Krazy Kiwi will rise the most • 150 mL krazy Kiwi, 5mL yeast • 150 mL water, heaping spoon of sugar, 5mL yeast • 150 mL water, 5mL yeast • Unknown temperatures

12. Design • Testing hypothesis – yeast grows best with greatest amount of sugar • Control – 1)all the things held constant 2)compare against • Variable – thing you are testing • CONTROLS: amt. of liquid, amt., of yeast, • VARIABLE: TYPE OF SWEETNESS

13. Scientific Inquiry/Scientific Method/ • Problem Solving • Identify a problem – What are the best conditions for yeast growth? • Gather data • State a hypothesis • Test the hypothesis • Draw conclusions • Report results

14. Warm up? • What scientific and technological advances have occurred since you were born?

15. Sunscreen experiment • What were the controls? • What was the variable? • Why did we have one sample without sunscreen?

16. Possible graph

17. Possible bar graph

18. Mass • Grams, kg • Measure the amount of matter an object has • Different from weight which is attraction of the gravity on an object

19. volume • Liters, mL or cm3 • The amount of space an object occupies • 1 L of water • 5 mL of medicine

20. Observation – info that can be gathered and confirmed with the senses. • Example – the coke can is red Inference – a deduction based on observation. Example: the person drinking diet coke must be on a diet. Hypothesis – tentative explanation of an observation that will be tested; an educated guess

21. Theory – explanation of events/behaviors based on “repeated” testing; withstands the test of time. Law?

22. Why do scientists need evidence? • To prove their theory • To not lead people astray • So others don’t do dangerous things • To come up with new theories • So others can build on your work • To fund new projects

23. test • Scientific method (3) • Multiple choice (15) • Measure line (5) • Rank distances (5) • Calculate the volume (1) • Open response (choose 1)

24. How many drops of water fit on the “head” of a penny”? • Background info – • Hypothesis? • Data?

25. practice • Find the length, width, area, & perimeter of note card in cm & mm

26. Sample • Design an experiment to find out what color surface heats up fastest in the Sun.