3 years ago

3. the closeness of a measurment to its true value is a measure of its ____ ?

Chemistry

1 answer:

valkas [14]3 years ago

4 0

The closeness of a measurement to its true value is a measure of its Accuracy.

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What is the importance of standardization in chemistry

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Standardisation is used to determine the concentration of a volumetric solution in order to achieve accurate and reliable titration results

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1. NaOH mass of a solution of 200g in which its percentage is 25%. What mass of sulfuric acid solution is needed to completely n

Ede4ka [16]

Answer:

$m_{H2SO4$ = 61.25 g

$m_{Na2SO4}$ = 88.75 g

Explanation:

$m_{NaOH}$ = $\frac{200 . 25 }{100}$ = 50 g

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2NaOH + H2SO4 ⇒ Na2SO4 + 2H2O

2 : 1 : 1 : 2

1.25 (moles)

⇒ $n_{H2SO4}$ = 1.25 × 1 ÷ 2 = 0.625 (moles) ⇒ $m_{H2SO4}$ = 0.625 × 98 = 61.25 g

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3 years ago

Which structural formula represents an unsaturated hydrocarbon?

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Answer:

Explanation:

your chosen answer is right as unsaturated mean contains double bond and 1st and 3rd is Wrong as Carbon only can have 4 bonds and 2nd is Wrong as it is saturated.

hope this helps :)

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2 years ago