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प्रश्न
Why is accurate measurement crucial in science?
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उत्तर
- The accuracy of measurement is of great concern in analytical chemistry. This is because faulty equipment, poor data processing, or human error can lead to inaccurate measurements. Also, there can be intrinsic errors in analytical measurement.
- When measurements are not accurate, this provides incorrect data that can lead to wrong conclusions. For example, if a laboratory experiment requires a specific amount of a chemical, then measuring the wrong amount may result in an unsafe or unexpected outcome.
- Hence, the numerical data obtained experimentally are treated mathematically to reach some quantitative conclusion.
- Also, an analytical chemist has to know how to report the quantitative analytical data, indicating the extent of the accuracy of measurement, perform the mathematical operation, and properly express the quantitative error in the result.
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संबंधित प्रश्न
Choose the correct option:
The number of significant figures in 1.50 × 104 g is __________
Choose the correct option:
In Avogadro’s constant 6.022 × 1023 mol-1, the number of significant figures is ________
What do you mean by significant figures?
Distinguish between accuracy and precision.
Solve the following question:
Round off the following quantity to two significant figures:
25.55 mL
Solve the following question:
Round off the following quantity to two significant figures:
0.00254 m
Solve the following question:
Round off the following quantity to two significant figures:
199 g
Solve the following question:
Round off the following quantity to three significant figures:
6.398 × 10-3 km
Solve the following question:
Round off the following quantity to three significant figures:
79,000 m
Solve the following question:
Round off the following quantity to three significant figures:
42,150
Solve the following question:
Round off the following quantity to three significant figures:
649.85
Solve the following question:
Express the following sum to the appropriate number of significant figures:
319.5 g − 20460 g − 0.0639 g − 45.642 g − 4.173 g
Solve the following problem:
Express the following quantity in exponential terms.
0.0003498
Solve the following problem:
Give the number of significant figures for the following.
1.230 × 104
Solve the following problem:
Give the number of significant figures for the following.
1.23 × 104
Solve the following problem:
Give the number of significant figures for the following.
1.89 × 10-4
Solve the following problem:
Write the following in exponential notation:
3,672,199
Solve the following problem:
Write the following in exponential notation:
0.00461
Solve the following problem:
Write the following in exponential notation:
198.75
Solve the following problem:
Perform the following operation:
2.12 × 106 − 3.5 × 105
Define: Least count
Define : Least count
Define Least count.
Define: Least count
Define Least count.
