Mary Smith obtained a density of 2.226 g/mL for a metal sample. Using a different method, Joseph Henry obtained a value of 2.335 g/mL for the same metal sample. Which student’s value is more accurate? Use the definition of accuracy to explain your answer.

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26-02-2020
Chemistry

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Mary Smith obtained a density of 2.226 g/mL for a metal sample. Using a different method, Joseph Henry obtained a value of 2.335 g/mL for the same metal sample. Which student’s value is more accurate? Use the definition of accuracy to explain your answer.

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Answer: We need true value to find out who is more accurate.

Explanation:

Precision refers to the closeness of two or more measurements to each other.

Accuracy refers to the closeness of a measured value to a standard or known value.

For Example: If you weigh a given substance five times and you get 3.0 kg each time. Then the measurement is very precise.

For Example: If the mass of a substance is 3.0 kg and one person weighed 3.05 kg and another person weighed 3.2 kg. Then, the weight measured by first person is more accurate.

According to the question:

Density measured by Mary = 2.226 g /ml

Density measured by Joseph= 2.335 g /ml

As, the standard or known value is not given, we can not know which student’s value is more accurate