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Andrew [12]
3 years ago
6

Which method is the typical first step when scientists communicate their scientific results?

Chemistry
2 answers:
hodyreva [135]3 years ago
5 0
Purpose
prediction
procedure
data
calculation
conclusion - results etc.
Maksim231197 [3]3 years ago
5 0

Answer:

The correct answer is submission of the results to a scientific journal for  a peer review.

Explanation:

It is the responsibility of the scientists to submit their results to the scientific peer review journals after attaining the results from the experiments. This is very essential as it is the duty of the scientists to handle the journals in order to completely scrutinize the set of the experiments and the outcomes attained in order to make sure that they all are devoid of any kind of mistakes and there is validity in the results obtained.

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Choose one metal from the reactivity series that will react safely with dilute sulphuric acid
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Answer:

Zinc (Zn) will safely react with dilute sulphuric acid.

Explanation:

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7 0
2 years ago
β‑Galactosidase (β‑gal) is a hydrolase enzyme that catalyzes the hydrolysis of β‑galactosides into monosaccharides. A 0.387 g sa
gtnhenbr [62]

Answer:

The molar mass of unknown β‑Galactosidaseis 116,352.97 g/mol.

Explanation:

To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

\pi=icRT

where,

\pi = osmotic pressure of the solution = 0.602 mbar = 0.000602 bar

0.000602 bar = 0.000594 atm

(1 atm = 1.01325 bar)

i = Van't hoff factor = 1 (for non-electrolytes)

c = concentration of solute = ?

R = Gas constant = 0.0820\text{ L atm }mol^{-1}K^{-1}

T = temperature of the solution = 25^oC=[273.15 +25]=298.15 K

Putting values in above equation, we get:

0.000594 atm=1\times c\times 0.0821\text{ L.atm }mol^{-1}K^{-1}\times 298.15 K\\\\c=2.4278\times 10^{-5} mol/L

The concentration of solute is 2.4278\times 10^{-5} mol/L

Volume of the solution = V =0.137 L

Moles of β‑Galactosidase = n

C=\frac{n}{V(L)}

n=2.4278\times 10^{-5} mol/L\times 0.137 L

n=3.3261\times 10^{-6} mol

To calculate the molecular mass of solute, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Moles of β‑Galactosidase = 3.3261\times 10^{-6} mol

Given mass of β‑Galactosidase= 0.387 g

Putting values in above equation, we get:

3.3261\times 10^{-6} mol =\frac{0.387 g}{\text{Molar mass of solute}}\\\\\text{Molar mass of solute}=116,352.97 g/mol

Hence, the molar mass of unknown β‑Galactosidaseis 116,352.97 g/mol.

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