Prac Skills

Descripción

Grade 12 Life Sciences Mapa Mental sobre Prac Skills, creado por Amira Cohen el 13/09/2020.
Amira Cohen
Mapa Mental por Amira Cohen, actualizado hace más de 1 año
Amira Cohen
Creado por Amira Cohen hace casi 4 años
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Resumen del Recurso

Prac Skills
  1. Terms to know:
    1. Theory: Statement designed to explain a large set of related observations that has been confirmed by experimentation. Theories are NOT WRONG
      1. Variable: anything that can change or does change during experiment.
        1. Qualitative Data: observations made without any measurements (color)
          1. Quantitative Data: observations made more precise with measurements (numbers)
            1. Double blinding: investigators do not know which treatment effect they are observing, nor do the subjects know what treatment they are getting.
              1. Control: variables whose values are prevented from changing. Its function is to verify that the results are caused by the independent variable and no other factor.
                1. Control experiment: an experiment in which all the variables are the same except for one (the value of the independent variable
                2. Common Questions
                  1. How to improve the reliability: what METHOD was wrong? Never say the equipment, and if there was a problem with the equipment, find a practical solution
                    1. Improving reliability
                      1. Repeat the experiment two or three times more and get an average which is more reliable
                        1. - Conduct the experiment over a wider range of independent values and get a wider range of answers
                          1. - DO. NOT. BLAME. YOUR. EQUIPMENT.
                        2. If you are asked to state your results, always state the trend in data then back this up by quoting data from the table or graph.
                          1. Give full, detailed description of your observation
                            1. List the controlled variables – THEN say how each was controlled
                            2. Avoiding errors:
                              1. prevent cross contamination by washing apparatus between uses
                                1. - Bending down to eye level so that apparatus is precise
                                  1. - Keeping measurements constant by ensuring that the water level in the syringe was the same each time by measuring at eye level or ensuring the temperature was always constant by using a thermometer.
                                  2. Designing your own experiment
                                    1. Only change one variable at a time (independent variable).
                                      1. Mention the quantity of substance and the control.
                                        1. Always mention that you are going to measure and how you are going to measure.
                                          1. Make sure you mention ever single apparatus (tick off if need be). Be. Very. Specific.
                                            1. Include “Draw a table to show your results”
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