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3 years ago

5

When the liquid is poured through a filter...?

1 answer:

Colt1911 [192]3 years ago

4 0

It separates soluble and insoluble molecules.

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Which of the following would indicate that a chemical change might be occurring?

vitfil [10]

D. Is the best indicator for a chemical change.

4 0

3 years ago

Read 2 more answers

The phenolic indicator (In-OH)has approximately the same pKa as a carboxylic acid. Which H is the most acidic proton in In-OH? C

Sidana [21]

The –OH+ group is most acidic proton in ln-OH as shown in figure (a). The proton is circled in the figure.

The stabilisation of the conjugate base produced is stabilises due to resonance factor. The possible resonance structures are shown in figure (b).

The acidity of a protonated molecule depends upon the stabilisation of the conjugate base produced upon deprotonation. The conjugate base of ln-OH is shown in figure (a).

The possible resonance structures are shown in figure (b). As the number of resonance structures of the conjugate base increases the stabilisation increases. Here the unstable quinoid (unstable) form get benzenoid (highly stable) form due to the resonance which make the conjugate base highly stabilise.

Thus the most acidic proton is assigned in ln-OH and the stability of the conjugate base is explained.

4 0

3 years ago

The eagle has landed was said when man landed on mars or on the moon

nekit [7.7K]

The moon, man has not been to mars yet

7 0

3 years ago

copper sulphate solution turns the colour of litmus into red but litmus changes into blue with baking soda solution although bot

Bingel [31]

Answer:

Copper sulphate is an acidic salt: It is the product of the reaction between a weak copper base and a strong acid , H2SO4

Litmus has a red colour in acidic solutions:

Conclusion: Acidic copper sulphate solution turns blue litmus to red

Baking soda is a basic salt : It is the reaction product of a weak acid , CO2 and a strong base , NaOH

Litmus has a blue colour in basic solutions:

Conclusion: basic baking soda solution turns red litmus to blue

8 0

3 years ago

Hemoglobin, an iron-containing oxygen-transport protein, is 0.349% Fe by mass.

nirvana33 [79]

Answer : The molar mass of hemoglobin is, $6.40\times 10^4g/mol$

Explanation : Given,

Molar mass of iron = 55.85 g/mol

0.349 % Fe by mass that means 0.349 grams of Fe present in 100 grams of hemoglobin.

or,

$\text{Percent of Fe}=\frac{4\times \text{Molar mass of Fe}}{\text{molar mass of hemoglobin}}\times 100$

Now put all the given values in this formula, we get:

$0.349=\frac{4\times 55.85g/mol}{\text{molar mass of hemoglobin}}\times 100$

$\text{molar mass of hemoglobin}=64011.46g/mol=6.40\times 10^4g/mol$

Thus, the molar mass of hemoglobin is, $6.40\times 10^4g/mol$

3 0

4 years ago