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2 years ago

In the artice, "As Sticky as a Gecko...but Ten

Chemistry

2 answers:

ra1l [238]2 years ago

6 0

Answer:

The adhesive is made up of two different layers.

The lower layer is made up of vertically aligned nanotubes.

The upper layer is made up of curly, spaghetti-like, nanotubes.

romanna [79]2 years ago

5 0

Answer:

B,C,D

Explanation:

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Propose a mechanism to account for the formation of a cyclic acetal from 4-hydroxypentanal and one equivalent of methanol. If th

timofeeve [1]

Answer:

If carbonyl oxygen of 4-hydroxypentanal is enriched with $O^{18}$ , then the oxygen label appears in the water .

Explanation:

In the first step, -OH group at C-4 gives intramolecular nucleophilic addition reaction at carbonyl center to produce a cyclic hemiacetal.
Then, one equivalent of methanol gives nucleophilic substitiution reaction by substituting -OH group in cyclic hemiacetal to produce cyclic acetal.
If carbonyl oxygen of 4-hydroxypentanal is enriched with $O^{18}$ , then the oxygen label appears in the water produced at the end of reaction.
Full reaction mechanism has been shown below.

8 0

3 years ago

Can I please get help with this question ‍♂️?

guapka [62]

Answer:

1.50 moles of POH or Potassium Hydroxide.

Explanation:

First of all, find the substance formula

The substance formula of Potassium Hydroxide is

KOH

Second of all, if you want to convert from grams to moles, you use molar mass of KOH

Third of all, find the molar mass of KOH.

K = 39.1 amu

O = 16.0 amu

H= 1.0 amu

Potassium has 1 atom, oxygen has 1 atom, and hydrogen has 1 atom.

So do this:

39.1(1) + 16.0(1) + 1.0(1) = 56.1

The molar mass of KOH is 56.1 g/mol.

Fourth of all, use dimensional analysis to show your work.

84.20 grams of KOH * 1 mol/56.1 g/mol

The moles will cancel out.

84.20 divided by 56.1 = 1.500892166

But I have to round my answer to two digits after the decimal points instead of using sig figs.

So I round to the hundredths place

1.500892166 = 1.50

So the final answer is 1.50 moles(don't forget the units) of POH.

Hope it helped!

3 0

2 years ago

How many neutrons does be-14 have?

Andreyy89

It has 8 neutrons in it

4 0

3 years ago

Read 2 more answers

If we find that there is a linear correlation between the concentration of carbon dioxide in our atmosphere and the global temp

loris [4]

Answer:

Explanation:

A linear correlation means the increase in one variable cause an increase in the other variable. In a graph, the linear correlation can be demonstrated by a right-slanted straight diagonal line. Therefore if an increase in carbon dioxide causes a directly proportional increase in global temperatures then the two are correlated.

3 0

3 years ago

HELP ASAP

sergejj [24]

D- A molecule

Explanation:

(Apex)

3 0

3 years ago