Scientific Process Experimental Error

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Presentation transcript:

Scientific Process Experimental Error Foothill Chemistry

Nobody’s Perfect There are always errors in measurement By repeated experimentation, we gain confidence that our measurements represent the “true” value.

Types of Errors Systematic Errors Random Errors Your process is wrong No matter how many times you perform the experiment correctly, you cannot get the “true” or accurate values Something’s wrong with the equipment Random Errors Inability to read instruments with complete accuracy Repeating brings gets closer to the true values

Accuracy and Precision

Accurate or Precise?

Accurate or Precise?

Percent Error How far off from the “true” value is the experimental result? |(YV – AV)| / AV *100 = Percent Error YV = Your Value (the experiment trial) AV = Accepted Value (the standard it’s measured against)

Qualitative vs. Quantitative Descriptions Observed, not measured Color, texture, smell, taste, appearance, beauty Ordinal – 1st, 2nd, 3rd, etc. Quantitative Deals with numbers Data which can be measured Length, height, area, volume, weight, speed, time, temperature, humidity, sound levels, cost, members, ages