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CIE Chemistry A-Level 4.2.2 - Practical Skills for Paper 3 - PowerPoint PPT Presentation

Jan 26, 2024 •136 likes •415 views

CIE Chemistry A-Level 4.2.2 - Practical Skills for Paper 3 Presentation of Data and Observations Flashcards www.pmt.education www.pmt.education What is the most common form of recording observations in chemistry? www.pmt.education

  1. CIE Chemistry A-Level 4.2.2 - Practical Skills for Paper 3 Presentation of Data and Observations Flashcards www.pmt.education www.pmt.education

  2. What is the most common form of recording observations in chemistry? www.pmt.education www.pmt.education

  3. What is the most common form of recording observations in chemistry? Data tables www.pmt.education www.pmt.education

  4. Where should the units of measurement be placed in the data table? www.pmt.education www.pmt.education

  5. Where should the units of measurement be placed in the data table? In the column headings. www.pmt.education www.pmt.education

  6. How are the independent and dependent variables set up in the table? www.pmt.education www.pmt.education

  7. How are the independent and dependent variables set up in the table? The independent variable is always in the first column of the table and the dependent variable is in the next column(s). www.pmt.education www.pmt.education

  8. Why are tables a good method of displaying qualitative data? www.pmt.education www.pmt.education

  9. Why are tables a good method of displaying qualitative data? They allow all the observations to be easily recorded and analysed. www.pmt.education www.pmt.education

  10. What degree of precision should results be given to? www.pmt.education www.pmt.education

  11. What degree of precision should results be given to? The degree of precision should reflect the measuring apparatus’ resolution. E.g. If a measuring cylinder has a resolution of 1.0 cm 3 , volumes should be recorded to the nearest 0.5 cm 3 . www.pmt.education www.pmt.education

  12. How many significant figures should calculated results be given to? www.pmt.education www.pmt.education

  13. How many significant figures should calculated results be given to? The same number of significant figures as (or one more than) the least accurate measured quantity. www.pmt.education www.pmt.education

  14. What type of data is suitable for displaying on a graph? www.pmt.education www.pmt.education

  15. What type of data is suitable for displaying on a graph? Quantitative data www.pmt.education www.pmt.education

  16. Why are graphs often used to display data? www.pmt.education www.pmt.education

  17. Why are graphs often used to display data? They clearly show patterns and trends in the data and make anomalous results easy to identify. www.pmt.education www.pmt.education

  18. How can an anomalous result be identified from a scatter diagram? www.pmt.education www.pmt.education

  19. How can an anomalous result be identified from a scatter diagram? The anomalous data value will fall outside the trend of all the other data values and will not lie on/near the line of best fit. www.pmt.education www.pmt.education

  20. For a graph of results, which axis do the independent and dependent variables go on? www.pmt.education www.pmt.education

  21. For a graph of results, which axis do the independent and dependent variables go on? Dependent variable - vertical y axis Independent variable - horizontal x axis www.pmt.education www.pmt.education

  22. When plotting a graph, what key points should be remembered? www.pmt.education www.pmt.education

  23. When plotting a graph, what key points should be remembered? - Draw in pencil and use a ruler - Must fill at least half the available space - Appropriate scale must be used - Label axes (including units) - Plot each point as a cross - Draw a ring around outliers - Draw a line/curve of best fit www.pmt.education www.pmt.education

  24. How can the gradient of a straight line graph be calculated? www.pmt.education www.pmt.education

  25. How can the gradient of a straight line graph be calculated? Gradient = change in y ÷ change in x www.pmt.education www.pmt.education

  26. How must a line of best fit be drawn? www.pmt.education www.pmt.education

  27. How must a line of best fit be drawn? A sharp pencil must be used. If the trend is a straight line, a ruler must be used to draw a continuous straight line through the values. If the trend is a curve, a continuous freehand curve must be drawn, connecting all the data values. www.pmt.education www.pmt.education

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