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suter [353]
3 years ago
13

A pattern that has been established based on verified experimental data that describes an observation but does not provide an ex

planation as to the reason why said observation occurs is a _________.
Chemistry
2 answers:
SSSSS [86.1K]3 years ago
8 0

Answer:

Hypothesis

Explanation:

This is a hypothesis. A hypothesis is simply a scientific guess to explain a particular phenomenon. It provides different approaches to which an observation can be verified and properly ascertained.

If we can deduce a pattern from a set of experimental data that we have but we have not explained why the observations occur, this is still within the phase of the scientific method called hypothesis.

Paraphin [41]3 years ago
5 0

Answer:

The correct answer will be-scientific law

Explanation:

The experiment is performed to test a tentative explanation or hypothesis which explains the process to a limited extent. The hypothesis when proved through repeated experiments gets transformed either in the scientific law or the scientific theory depending on the quantitative measurement.

The scientific law represents the description of any natural phenomenon by providing the mathematical expressions but it does not provide an explanation to the natural process as provided by the scientific theory.

Since the statement does not provide the explanation but only the description of the natural events therefore, a scientific law is the correct answer.

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If the reaction of 3.50 moles of lithium with excess hydrofluoric acid produced a 75.5% yield of hydrogen gas, what was the actu
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<u>Answer: </u>The correct answer is 1.32 mol H_2

<u>Explanation:</u>

For the reaction of lithium and hydrofluoric acid, the equation follows:

2Li+2HF\rightarrow 2LiF+H_2

By Stoichiometry of the reaction:

if 2 moles of lithium is producing 1 mole of hydrogen gas,

Then, 3.50 moles of lithium will produce = \frac{1}{2}\times 3.5=1.75mol of hydrogen gas.

  • Now, to know the theoretical yield of hydrogen gas, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}   ...(1)

Moles of hydrogen gas = 1.75 mol

Molar mass of hydrogen gas = 2 g/mol

Putting values in above equation, we get:

1.75mol=\frac{\text{Mass of hydrogen gas}}{2g/mol}\\\\\text{Given mass of hydrogen gas}=3.5gl

  • To calculate the percentage yield, we use the equation:

\%\text{ yield}=\frac{\text{Actual yield}}{\text{Theoretical yield}}\times 100

Percentage yield = 75.5 %

Theoretical yield = 3.5 g

Putting values in above equation, we get:

75.5=\frac{\text{actual yield}}{3.5g}\times 100\\\\\text{Actual yield}=2.64g

  • Now, calculating the moles of hydrogen gas, we put the value in equation 1, we get:

\text{Moles of hydrogen gas produced}=\frac{2.64g}{2g/mol}=1.32mol

Hence, the correct answer is 1.32 mol H_2

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3 years ago
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Explanation:

i think its B but i'm not fully sure (Correct)

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