How Science Works - Revision

How Science Works - Revision

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Multiple Choice

What is the name of this apparatus?

• Beaker

• Conical Flask

• Measuring Cylinder

Multiple Choice

What is the name of this apparatus?

• Beaker

• Conical Flask

• Measuring Cylinder

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Multiple Select

Match the unit of measurement to the apparatus

• centimeters (cm)

• mililitres (ml)

• degrees Celcius

• grams (g)

Multiple Select

Match the unit of measurement to the apparatus

• centimeters (cm)

• mililitres (ml)

• degrees Celcius

• grams (g)

Multiple Select

Match the unit of measurement to the apparatus

• centimeters (cm)

• mililitres (ml)

• degrees Celcius

• grams (g)

Multiple Select

Match the unit of measurement to the apparatus

• centimeters (cm)

• mililitres (ml)

• degrees Celcius

• grams (g)

Recording Data

• The independent variable is the thing you are investigating and changing

• The dependent variable is the thing you are recording

• Ensure you put units in your headings

• Plan repeats into your table!

Multiple Choice

An independent variable is...

• the variable that you change or select the values for

• a variable that must remain the same throughout an investigation

• the variable that you measure or observe to get your results

Multiple Choice

What is the dependent variable?

• the variable that you change or select the values for

• a variable that must remain the same throughout an investigation

• the variable that you measure or observe to get your results

Multiple Choice

In this investigation, the independent variable is temperature of water and the dependent variable is mass of sugar dissolved. Which variable should you record in the left-hand column?

• mass of sugar dissolved (g)

• temperature of water (

  $\degree$ C)

Multiple Choice

In this investigation, the independent variable is the distance from the lamp and the dependent variable is the number of bubbles of oxygen produced in 2 minutes. Which variable should you record in the left-hand column?

• number of bubbles of oxygen produced in 2 minutes

• distance from the lamp

Calculating the Mean Average

• In science we always calculate the MEAN average

• You do this by dividing the sum of total values by the total number of values

• 
  

• 
  

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Reading Values from Graphs

• Graphs are a common method to visually illustrate relationships in the data

• They allow the investigator to get a visual image of the observations, which simplifies interpretation and drawing conclusions

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Line of Best Fit

After you plot your data, you can draw a line of best fit. This DOES NOT join up all the data, but expresses the relationship between the data.

Drawing Conclusions

• You can look at a line graph and describe the relationship between two variables

• A straight line means there is a linear relationship

• If the line goes up, the relationship is positive

• If the data is scattered everywhere, there is no correlation

Drawing Conclusions

• If there is a change in relationship, one variable changes the other - this is known as a correlation

• An upward slope shows a positive correlation

• A downward slop shows a negative correlation

• 
  

Multiple Choice

What phase describes the relationship between two variables when the line of best fit is straight?

• Linear relationship

• Non-linear relationship

• No correlation

Multiple Choice

What type of relationship is there between the two variables on the graph?

• No relationship

• Linear relationship

• Non-linear correlation

Multiple Choice

What type of relationship is there between the two variables on the graph?

• No relationship

• Linear relationship

• Non-linear correlation

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Multiple Choice

What conclusion can you draw from this graph?

• As the radius of the parachute increased, the time taken for the parachute to fall decreased

• As the radius of the parachute increased, the time taken for the parachute to fall increased initially, but then it stayed the same

• As the radius of the parachute increased, the time taken for the parachute to fall also increased

Revise

Your How Science Works test is tomorrow!