Ocean Density Three Investigations. Investigation 1 – Which is denser: fresh water or salt water? Read the question carefully. – What is the independent

Ocean Density

Three Investigations

Investigation 1 – Which is denser: fresh water or salt water?

• Read the question carefully.– What is the independent variable?– What is the dependent variable?– What are some controlled variables?


• Write a hypothesis– If the independent variable changes (how does it

change?)– Then the dependent variable changes (how does it

change?)


• You have these materials to work with– Triple beam balance– Beaker– Plastic cup– Pipette – Graduated cylinder– Spoon – Salt


• Write a procedure– What do you need to do first?– What are you testing? – How are you testing it?– What are you measuring?– How are you measuring it?– How many times are you repeating the test?– What calculations do you need?


• Make a chart– What needs to be in your chart?– Where do you put the independent variable?– How do you show the number of trials?– How are you going to title the chart?


• Conduct your investigation• Collect your data


• Make a graph– What are you going to put on the X-axis?– How will you label the X-axis?– What are you going to put on the Y-axis?– How will you label the Y-axis?– What kind of scale do you need?– What is an appropriate title for your graph?


• Write a conclusion– Answer the research question – which water was

densest?– Do you accept or reject your hypothesis?– Why? Explain your data.– Where might errors have been made?

Investigation 2 – How does the amount of salt in water affect density?



• Write a hypothesis– If the independent variable changes – Then the dependent variable changes



• Write a procedure– What do you need to do first?– What are you testing? – How are you testing it?– What are you measuring?– How are you measuring it?– How many times are you repeating the test?– What calculations do you need?


• Make a chart– What needs to be in your chart?




• Make a graph– What are you going to put on the X-axis?– What are you going to put on the Y-axis?– What kind of scale do you need?– What is an appropriate title for your graph?


• Write a conclusion– Answer the research question– Explain your data– Where might errors have been made?


Investigation 3 – How does the temperature of saltwater affect density?


• Write a hypothesis– If the independent variable …...Then the

dependent variable changes……




• Write a procedure– What are you testing? – How are you testing it?


• Make a chart– What needs to be in your chart?




• Make a graph


• Write a conclusion


Documents

Ocean Density Three Investigations. Investigation 1 – Which is denser: fresh water or salt water? Read the question carefully. – What is the independent