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katrin2010 [14]
3 years ago
10

In everyday speech, the words precision and accuracy are often used interchangeably. When these terms are used in science, are t

heir meanings the same as their everyday meanings?
Chemistry
1 answer:
zvonat [6]3 years ago
8 0

Answer:

            No, in science their meanings are not the same as their everyday meanings.

Explanation:

                   In Science, Precision and Accuracy are defined as,

Accuracy:

               Accuracy is the value which is closest to the known or standard value.

Precision:

                While, Precision is the value of closeness of two measured values to each other.

Example:

             Let suppose in Chemistry Lab you weight an object as 50 g. While the actual weight of that object is 30 g. It means your reading is not accurate.

             On second measurement you find that the object weight is 31 g. This time your reading is not precise.

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The compound methylamine, CH3NH2, is a weak base when dissolved in water. Write the Kb expression for the weak base equilibrium
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Answer:

Kb = [CH₃NH₃⁺] × [OH⁻] / [CH₃NH₂]

Explanation:

According to Brönsted-Lowry acid-base theory:

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When methylamine reacts with water, it behaves as a Brönsted-Lowry base, according to the following reaction.

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The basic equilibrium constant (Kb) is:

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