Base units

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# Base units - PowerPoint PPT Presentation

Base units. Mass – gram Temperature- ° Celsius Time –seconds, minutes Length – meter Area – meters 2 Volume – meters 3 , liter. Warm up/practice. 78 g = __________ mg 25 g = __________kg 578cm = _________m 456 m = __________km 500 mL = ________L.

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## PowerPoint Slideshow about 'Base units' - kevyn

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Presentation Transcript
Base units
• Mass – gram
• Temperature- ° Celsius
• Time –seconds, minutes
• Length – meter
• Area – meters2
• Volume – meters3, liter
Warm up/practice
• 78 g = __________ mg
• 25 g = __________kg
• 578cm = _________m
• 456 m = __________km
• 500 mL = ________L
What characteristics do most scientists share?
• Why is measurement important in science?
Warm up
• What is “scientific inquiry?”
Myth busters
• {They provide an example of doing science.}
• They choose a myth
• Background information
• Hypothesis
• Design test, observe, collect data share
Warm up
• When do you use scientific inquiry in your life? (Outside of science class)
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
design
• Does temperature affect yeast behavior?
• Hot – 85°C
• Warm - 27°C
• Cold – 16 °
• 150 mL water
• 10 mL sugar
• 15 mL yeast
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
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
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
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
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
Warm up?
• What scientific and technological advances have occurred since you were born?
Sunscreen experiment
• What were the controls?
• What was the variable?
• Why did we have one sample without sunscreen?
Mass
• Grams, kg
• Measure the amount of matter an object has
• Different from weight which is attraction of the gravity on an object
volume
• Liters, mL or cm3
• The amount of space an object occupies
• 1 L of water
• 5 mL of medicine
• 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

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

Law?

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
test
• Scientific method (3)
• Multiple choice (15)
• Measure line (5)
• Rank distances (5)
• Calculate the volume (1)
• Open response (choose 1)
practice
• Find the length, width, area, & perimeter of note card in cm & mm
Sample
• Design an experiment to find out what color surface heats up fastest in the Sun.