Friday 2/7/14Objectives: IWBA to show mastery on gas law unitAgenda:Catalyst -----5 minSubmit homeworkReview gas laws----- 10 minTest on Gas LawsScience Fair Conclusion Acids and baseVideo clipsCatalystTrue of FalsePressure and temperature have inverse relationship.Volume and temperature have direct relationship. Pressure and volume have inverse relation ship. Homework:Book log for science fair

Identifying Variables&Designing Investigations

3 Kinds of VariablesIndependent Variable something that is changed by the scientistWhat is testedWhat is manipulated

3 Kinds of VariablesDependent Variable something that might be affected by the change in the independent variableWhat is observedWhat is measuredThe data collected during the investigation

3 Kinds of VariablesControlled Variable a variable that is not changedAlso called constantsAllow for a fair test

For Example:

Students of different ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle.

Lets Practice!A students grade depends on how much she studies.Independent variable:__________Dependent variable:___________2. The height of a plant and the amount you water it.Independent variable: ___________Dependent variable: _____________Time studyinggradeAmount wateredheight

3. The amount of money you make and the number of hours you work.Independent variable: _____________Dependent variable:_____________4. The number of sodas you buy and the total money spent.Independent variable:______________Dependent variable:_______________5. The number of houses you can paint depends on how much time you have.Independent variable:______________Dependent variable:_______________

Hours workedAmount of moneyNumber of sodasTotal moneyAmount of timeNumber of houses

Identify the variables in this investigation.

What was the independent variable?Ages of the studentsDifferent ages were tested by the scientist

What was the dependent variable?The time it to put the puzzle togetherThe time was observed and measured by the scientist

What was a controlled variable?Same puzzleAll of the participants were tested with the same puzzle.It would not have been a fair test if some had an easy 30 piece puzzle and some had a harder 500 piece puzzle.

Another example:

An investigation was done with an electromagnetic system made from a battery and wire wrapped around a nail. Different sizes of nails were used. The number of paper clips the electromagnet could pick up was measured.

What are the variables in this investigation?

Independent variable:Sizes of nailsThese were changed by the scientist

Dependent variable:Number of paper clips picked upThe number of paper clips observed and counted (measured)

Controlled variables:Battery, wire, type of nailNone of these items were changed

One more:

The higher the temperature of water, the faster an egg will boil.

Independent variable temperature of waterDependent variable time to cook an eggControlled variable type of egg

Last one:

The temperature of water was measured at different depths of a pond.

Independent variable depth of the waterDependent variable temperatureControlled variable thermometer

Designing Investigations

The greater the amount of soap in a soap and water mixture, the bigger a soap bubble can be blown.Design an investigation to test this hypothesis.Identify the variablesWhat exactly will be changed? How will it be changed?What exactly will be measured? How will it be measured?

The farther a ball drops, the higher it will bounce.Design an investigation to test this hypothesis.Identify the variablesWhat exactly will be changed? How will it be changed?What exactly will be measured? How will it be measured?

Our conclusion outlineT= Restate ProblemRestate your hypothesis (It was predicted that)Accept or reject your hypothesisProvide evidenceActual data from the experimentWhat did the data say? Relationships or trends in the dataProvide evidenceIssues or problems with the investigationProvide evidenceW=Wrap it up! Concluding sentence with transition word, rephrased problem, and explain why the experiment was important.

Future ConsiderationsTell what variable you would change if you could do the experiment again.Tell how you might take your experiment to the next step.

Future ConsiderationsExampleIf I could do this experiment again , the variable I would change would be the amount of caffeine I would place in each plant group. I would use 50ml for plant group #1, 100ml for plant group #2, and 150ml for plant group #3. I would also have three control groups of plants. One would get 50ml of water. One would get 100ml of water. And one would get 150ml of water. I want to see which amount of caffeine helps plants grow the tallest.

Make Your BoardStart your information on the top left panel of the board, move down the left panel, across the middle panel, and from the top down on the right panel.Place pictures of your experiment on your board.

Make your Board

Make your Board

Bringing It TogetherKeys for success:Make a time-line and stick to it.Parental supportOrganization

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