How Science Works - Revision

How Science Works - Revision

Fill in the Blanks

The apparatus shown in the photograph is a pair of

goggles

Fill in the Blanks

What is the name of the apparatus shown in the photograph?

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

Fill in the Blanks

What would you use this apparatus to measure?

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

• 
  

• 
  

Fill in the Blanks

What is the mean value of the following data set?

3, 5, 7

Fill in the Blanks

What is the mean value of the following data set?

2, 2, 3, 5, 8

Fill in the Blanks

What is the mean value of the following data set?

6, 4, 6, 5, 3

Give your answer to one decimal place

Fill in the Blanks

Calculate the mean result for the low resistance setting.

Don't include the units in your answer. Round to a whole number

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

Fill in the Blanks

At what temperature was time taken for the reaction to complete 95s?

Don't include units in your answer

Fill in the Blanks

What was the time taken for the reaction to complete when the temperature was 37
Don't include units in your answer

 $\degree$  C

Fill in the Blanks

How many bubbles were produced in 2 minutes when the distance from the lamp was 25cm?
Don't include units in your answer

Fill in the Blanks

At what distance from the lamp will pondweed produce 48 bubbles of oxygen in 2 minutes?
Give your answer in centimeters. Don't include units in your answer

Fill in the Blanks

At what force was the extension of the spring 100mm. Don't include units in your answer

Fill in the Blanks

What was the extension on the spring when the force was 7N. Don't include units in your answer

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

Fill in the Blanks

What word completed the sentence?

When the time taken for the reaction to complete is shorter, it means that the reaction happens at a

rate.

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!