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OAT Gen Chem Day Two

QuestionAnswer
What are beakers used for? Heating, mixing, and stirring (NOT accurate for measuring volume)
What are test tubes used for? Hold small volumes, can be heated/cooled or store solutions over time (NOT for measuring volume)
What's the most precise way to measure liquid volume? Pipettes
What are graduated cylinders used for? Measuring volume (narrower and taller than beakers with volume markings)
What equipment is used in titrations? Burette and Erlenmeyer Flask
Order glassware from least to most precise Beaker < Graduated Cylinder < Burette < Pipette
How do you read liquid volume correctly? Read at the meniscus's lowest point with eyes level to the glassware
How do you measure mass properly? Use digital balance, tare it first with weighing paper on it, never place substance directly on balance
What's the difference between accuracy and precision? Accuracy = how close to true value; Precision = how close measurements are to each other
What is systematic error? Consistent shifts in one direction every time (e.g., forgetting to tare balance, faulty equipment)
What is random error? Errors in both directions by different amounts (e.g., inconsistent meniscus reading, human error)
Percent error formula? |Experimental - Actual| / Actual × 100
Which zeros are significant? Zeros between non-zero numbers and trailing zeros after decimals (NOT leading zeros or trailing zeros without decimals)
Fume hood: provides proper ventilation in an enclosed space such that one’s exposure to harmful vapors or fumes from any volatile substances is minimized.
Created by: smurtab
 

 



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