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nlexa [21]
3 years ago
15

A researcher measures the equilibrium separation between two flat hydrophilic mica plates in a solution of non-ionic surfactant.

When the surfactant concentration is below CMC the surfaces touch at 0 nm distance without any separation (i.e., there is no surfactant adsorption and repulsion)
a) The researcher increases the surfactant concentration much above CMC and finds out that the system has equilibrium separations at 0 nm, 4 nm, 8 nm, 12 nm and some at larger distances. Draw schematics and explain the reason for this effect.
b) The researcher hydrophobizes the mica surfaces and again dips them in the first solution with surfactant concentration below CMC. When these surfaces are brought in contact, they remain separated at a distance of 4 nm (no equilibria at larger separations). Draw a schematic and explain the reason for this observation with hydrophobic surfaces.

Chemistry
1 answer:
svet-max [94.6K]3 years ago
3 0

Answer:

See explaination and attachment

Explanation:

please kindly see attachment for the step by step solution of the given problem.

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How many grams of water are made from the reaction of 4.0 grams of hydrogen gas with the given reaction 2H2+O2--->2H2O
Sergeeva-Olga [200]

Answer:

The mass of water is 36 g.

Explanation:

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Solution:

First of all we will write the balance chemical equation:

2H₂ + O₂  →  2H₂O

Number of moles of hydrogen = mass / molar mass

Number of moles of hydrogen = 4 g/ 2 g/mol

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Now we compare the moles of water with hydrogen from balance chemical equation.

                               H₂     :     H₂O

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Mass of water =  36 g

If the water oxygen is in excess than mass of water would be 36 g.

4 0
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Which of the following is not a possible termination step in the free radical chlorination of methane? Group of answer choices ∙
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The age of the oldest stars

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The Astronomers used the techniques like the age of oldest stars, how fast the distant galaxies are moving away from us, patterns of background radiation and along with the Big Bang as reference point, they estimate that the universe may be approximately 12 billion years old.

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