Bell Work

• Pick up sheet by the Door
• Cut out the squares on the bottom and glue them into the appropriate boxes above.
• Skip 4 pages (these will be your TOC)
• Then glue the sheet into your Composition Book.
• Make sure you date it and Put it in your TOC

Bell Work

In Basket by the door.

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Don’t forget to use hand Sanitizer

Bell Work

Not So Current, Current Event

• Grab a National Geographic, flip through and find an article that you like.

• You will need to read the article and then write a summary of the article.

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• It should be about a ½ a page.
• The last paragraph(4 to 5 senticenes) should be your opinion of the article.

Science Begins with OBSERVATIONS

**Try an exercise in observation.  How good are your observing skills?

Observing- gathering information with the senses (like sight)

Inferences

Inference is an explanation based on both observation AND reasoning.

Inferences depend on previous knowledge

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Observation are concrete

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Inference are variable

INFERENCE - a logical interpretation based on observations and prior knowledge

What conclusions can you draw from the photo?

Data = information gathered from observations

Quantitative = a quantity, a number or measure

Qualitative = a quality, description

Consider the dubia roach:

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What quantitative data could you gather

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Qualitative data?

Quantitative or Qualitative?

Scientific Method

Scientific Method

• Observation
• Hypothesis
• Experiment
• Experimental group
• Control group
• Results
• Scientific Theory

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Variables

• Independent Variable
• Manipulated Variable
• Fertilizer
• X axis

• Dependent Variable
• Responding Variable
• Plant Growth
• Y axis

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Variables cont…

• Control variable

• Types of control variables
• Sunlight
• Temperature
• Water
• What are some others?

Scientific Method�SpongBob Variables

• Mr. Krabbs wants to make Bikini Bottoms a nicer place to live.
• He created a sauce that he thinks will reduce body gas associated with eating crabby patties.
• He recruits 100 customers.
• 50 eat crabby patties with the new sauce. Group A
• 50 with old sauce Group B
• 40 of group A reports less gas
• 6 of group B reports less gas

• What is the:
• Independent variable

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• Dependent variable

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• Control group

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• What should Mr Krabs’ conclusion be

Sauce

Gas

Group B

The Simpson's Variables

• Bart believes that mice exposed to microwaves will become extra strong.
• He decides to perform this experiment by placing 10 mice in a microwave for 10 seconds – group A
• He compared these to 10 mice that are not exposed – group B
• The mice have to push a heavy block of wood.
• In Group A 8 mice push the wood
• In Group B 7 mice push the wood

• What is the:

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• Independent Variable

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• Dependent Variable

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• Control Group

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• What should Bart’s conclusion be?

Microwaves

Extra strength

Group B

A. INDEPENDENT VARIABLE:

..condition which is manipulated

…X axis

B. DEPENDENT VARIABLE:

…any change that results from

the independent variable

…Y axis

http://www.visualmining.com/examples/styles/line.html?source=ChartTypesCampaign

GRAPHS

• What is a graph?
• Graphs help us visualize numerical data.
• There are three main types of graphs:
• Line
• Bar
• Pie

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Line Graphs

Line Graphs are used to show the relationship between variables

Bar Graph

Bar Graphs are used to show a comparison of multiple objects

PIE GRAPH

Pie graphs are used to show the parts of a whole

http://www.mcwdn.org/Graphs/CircleGraph.html

Types of Relationships (between variables

Direct: as x increases

y increases

Indirect: as x increases

y decreases

Constant: as x increases

y remains the same

What’s wrong with this recipe

a decimal system of measurement based on units of 10

SI System - The international system of measurement and units

Bell Work

• Remember to date your bell work
• What are the four Spheres of Earth Science?
• Give an example of each.
• Convert the following:
• 1500mg = ____ g
• 120m = _____ km
• 500ml = _____ L

Density

• Remember
• Mass is the amount of matter in an object
• Volume is the amount of space an object takes up

If both boxes have the same volume and all the balls have the same mass. Which has the greater DENSITY?

(D=m/v).

The unit for density is : g/ml or g/cm³

Remember: 1ml = 1cm³

Density

Which has a greater density a Styrofoam cup or ceramic cup

vs.

Density

• To find the density of an object
• 1^st find the mass (g)

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Density cont…

• To find the density of an object
• 2^nd find the volume
• If it is a liquid use a graduated cylinder read the bottom of the meniscus (ml)
• If it is a regular shaped object – L x W x H (cm³)
• If it is an irregular shaped object – Water Displacement (ml)

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Density cont…

• D = mass / volume ( D=g/ml )
• Divide the mass by the volume
• grams / ml

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• Example: mass = 6 g and volume = 2 ml

6 g / 2 ml = 3 g/ml

Density cont….

• 2^nd find the volume cont….
• If it is a regular shaped object (like a block of wood) use l*w*h

h

w

l

Measured in cm units cm x cm x cm = cm³

cm³ = ml

Thus cm³ is a unit of volume

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Density cont….�2^nd find the volume cont….�

• If the object is irregularly shaped use the Water Displacement method
• Measure an amount of water in a graduated cylinder – record
• Place object in cylinder (the water will raise) read the change – record
• Subject the two – the difference is the volume of the object

The density of water is 1.0 g/mL

• If an object’s density is greater than 1.0 g/mL will it sink or float?

http://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=17

Will a Diet Pepsi float or sink?

Regular Pepsi float or sink?

Form a hypothesis.

Write it down in your notes.

Let’s see what happens!

Were you correct in your predictions?

Why or why not?