Difference Between Terms
Summary:
This comprehensive Difference Between Terms text delves into various chemistry concepts, including differences between precision and accuracy, systematic and random errors, atomic and molecular masses, molecular and formula masses, empirical and molecular formulas, as well as atom, molecule, and molecular ion distinctions. The text explores diverse types of bonds, such as ionic, covalent, and dative bonds, along with molecular orbitals, hybrid orbitals, valence bond theory and molecular orbital theory. Additionally, it covers ground and excited states, open, closed, and isolated systems, and the distinctions between exothermic and endothermic reactions, intensive and extensive properties, hydration and hydrolysis, and oxidation and reduction processes.
Furthermore, the text delves into topics like molarity and molality, oxidation numbers and valency, electrolytes and non-electrolytes, strong and weak electrolytes, electrolytic and galvanic cells, slow and fast reactions, and the rate of reaction and rate constants.
Excerpt:
Difference Between Terms
2.1 Difference between Precision and Accuracy
| Precision | Accuracy | |
| 1. | It is the close reproducibility of several results of measurement. i.e. Precision is the close agreement of several results of measurements. | It is the close reproducibility of measured results with true or accepted results. i.e. Accuracy is the close agreement of measured results with universally accepted results. |
| 2. | Precision is the concordance of a series of measurements of the same quantity | Accuracy is the concordance of a measured result with a universally accepted result. |
| 3. | If the measured results are close to each other, then precision is high and vice versa. | If measured results are close to a true value, then accuracy is high and vice versa. |
| 4. | It shows the degree of refinement in the performance of a measurement. | It expresses the degree of correctness or exactness of a measurement. |
| 5. | It is checked by repeating measurements. | It is checked by using a different method. |
| 6. | Poor precision results from poor technique. | Poor accuracy results from procedural or equipment flaws. |
| 7. | Poor precision is associated with random errors | Poor accuracy is associated with systematic errors. |
| 8. | Good precision is usually a sign of good accuracy, but precision does not guarantee accuracy. | It is a common misconception that good precision means good accuracy, but it is not always true. Thus accuracy requires precision, but precise work may also be inaccurate due to faulty apparatus. |
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