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JulijaS [17]
2 years ago
14

Sea stack sea arch an sea caves are all examples of land features created by

Chemistry
1 answer:
Darya [45]2 years ago
4 0

The correct answer is - wave erosion.

The sea stack, sea arch, and the sea caves, are all land features that have gradually been formed by the influence of the waves, or rather by the erosion that the waves have caused on them.

The sea stack is a land form very close to the coast, and it is manifested by solitary very steep rocks, or as group of very steep rocks, and they have formed because of the wave and wind erosion.

The sea arch is land form that appears as an opening in a cliff, being formed by the the wave refraction where the focus of waves goes on the sides of a headland.

The sea caves are openings deeper into the crust, where the waves managed to erode the softer rocks, and the water to penetrate deeper inside.

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If 200 g of benzoyl peroxide are used with 38 Kg of PTFE monomer, calculate the expected molecular weight of the polymer if (i)
den301095 [7]

Explanation:

The molecular weight of benzoyl peroxide is 242.23 g/mol.

Therefore, number of moles present in 200 g of benzoyl peroxide are as follows.

            No. of moles = \frac{mass}{\text{molar mass}}

                                  = \frac{200 g}{242.23 g/mol}

                                  = 0.825 mol

Molecular weight of PTFE is 100 g/mol.Hence, calculate the number of moles of PTFE in 38 kg as follows.

As 1 kg = 1000 g. So, 38 kg = 38000 g.

             No. of moles = \frac{mass}{\text{molar mass}}

                                  = \frac{38000 g}{100 g/mol}

                                  = 380 mol

As it is given that the initiator is 15% active. So, actual number of moles of benzoyl peroxide are as follows.

                        0.15 \times 0.826

                           = 0.124 mol

For combination, 1 mol of benzoyl peroxide produces 1 chain. Therefore, degree of polymerization will be calculated as follows.

                    DP = \frac{380 mol}{0.124 mol}    

                          = 3065.33 mol

Average molecular weight of monomer is as follows.

       \frac{0.124}{0.124 + 380} \times MW_{benzoyl} + \frac{380}{0.124 + 380} \times MW_{PTFE}

       = 100.05 g/mol

Therefore, calculate the expected molecular weight of polymer as follows.

                   3065.33 \times 100.05 g/mol

                     = 306675.23 g/mol

Hence, for disproportion 1 mole benzoyl peroxide produces 2 chains.

                     DP = \frac{2 \times 380}{0.124}

                           = 6129.03

Therefore, calculate the expected polymer weight as follows.

                     6129.03 \times 100.05

                   = 613209.68 g/mol

Thus, we can conclude that the the expected polymer weight is 613209.68 g/mol.

6 0
3 years ago
How many atoms of lead are contained in 0.532mol?​
Colt1911 [192]

Answer:

3.2043 x 10²³

Explanation:

No. of Mole of lead (Pb) = 0.532 mol

No. of atoms of lead = ?

Solution:

Formula Used to calculate

no. of moles = numbers of particles (ions, molecules, atoms) /Avogadro's number

Avogadro's no. = 6.023 x10²³

So,

The formula could be written as

no. of atoms of lead Pb = no. of moles x 6.023 x10²³

Put the values in above formula

no. of atoms of lead Pb = 0.532 mol x 6.023 x10²³

no. of atoms of lead Pb = 3.2043 x 10²³

so 3.2043 x 10²³ atoms of lead are contained in 0.532 mole.

6 0
3 years ago
What types of compounds do not dissolve in water?
Nataliya [291]
Oil doesn't dissolve in water, which could be your answer.
8 0
3 years ago
What does ClF3 stand for
Nostrana [21]

Answer:

CHLORINE TRIFLUORIDE

Explanation:

3 0
3 years ago
How do you explain the relatively high conductivity of tap water compared to a low or zero conductivity for distilled water?
gladu [14]
Tap water contains many dissolved ions that are required to carry an electric current, whilst distilled water contains no or relatively low amounts of dissolved ions. the absence of ions in the distilled water accounts for the low to zero conductivity of the water

hope that helps!
4 0
2 years ago
Read 2 more answers
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