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3 years ago

A hypothesis must be testable and falsifiable to be considered scientific

Chemistry

2 answers:

Zarrin [17]3 years ago

7 0

Its TRUE because the hypothesis is only true when you have facts behind it has to be testable

ankoles [38]3 years ago

6 0

Answer:

A. True

Explanation:

When a scientific hypothesis is formulated, it must be testable. Testable means that we can conduct a scientific experiment and observe if the results agree or disagree with the proposed hypothesis. Also a scientific hypothesis is falsifiable meaning that if the observation proves that the hypothesis is false then we adhere t that data, we cannot manipulate the data to prove that a hypothesis is always true.

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3 years ago

Suppose you are working with a NaOH stock solution but you need a solution with a lower concentration for your experiment. Calcu

Monica [59]

Answer: The volume of the 1.224 M NaOH solution needed is 26.16 mL

Explanation:

In order to prepare the dilute NaOH solution, solvent is added to a given amount of the NaOH stock solution up to a final volume of 250.0 mL.

Since only solvent is added, the amount of the solute, NaOH, in the dilute solution is the same as in the volume taken from the stock solution.

Molarity (M) is calculated from the following equation:

M = n ÷ V

where n is the number of moles of the solute in the solution, and V is the volume of the solution.

Accordingly, the number of moles of the solute is given by

n = M x V

Now, let's designate the stock NaOH solution and the dilute solution as (1) and (2), respectively . The number of moles of NaOH in each of these solutions is:

n (1) = M (1) x V (1)

n (2) = M (2) x V (2)

As the amount of NaOH in the dilute solution is the same as in the volume taken from the stock solution,

n (1) = n (2)

and

M (1) x V (1) = M (2) x V (2)

For the stock solution, M (1) = 1.244 M, and V (1) is the volume needed. For the dilute solution, M (2) = 0,1281 M, and V (2) = 250.0 mL.

The volume of the stock solution needed, V (1), is calculated as follows:

V (1) = M (2) x V (2) ÷ M (1)

V (1) = 0.1281 M x 250.0 mL ÷ 1.224 M

V (1) = 26.16 mL

The volume of the 1.224 M NaOH solution needed is 26.16 mL.

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Answer:

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Explanation:

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