Which type of silk is the strongest? (1 po o nonbiodegradable

Nvm i dont have any questions

gregori [183]

Answer:

well if you ever do neeed help im here

Explanation:

5 0

2 years ago

1. Calculate the average atomic mass of iron if its abundance in nature is 15%-iron-55 and

blsea [12.9K]

The average atomic mass of iron : 55.85 amu

<h3>Further explanation </h3>

The elements in nature have several types of isotopes

Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.

An atomic mass unit = amu is a r<em>elative atomic mass of 1/12 the mass of an atom of carbon-12. </em>

The 'amu' unit has now been replaced with a unit of 'u' only

Atomic mass is the average atomic mass of all its isotopes

atomic mass X = mass isotope 1 . % + mass isotope 2.% ...

The average atomic mass of iron

$\tt =0.15\times 55+0.85\times 56\\\\=\boxed{\bold{55.85~amu}}$

8 0

3 years ago

Which of the following biological macromolecule is correctly paired with its main function in the body?

daser333 [38]

Answer is: Proteins-growth and repair of cellular structures.
Proteins are macromolecules made of amino acids (usually 20 amino acids) and they are main structure molecules of all living cells.
Lipids and sugars (glucose) are main source of energy in every living organism and they are used as the cell's energy reserves.

6 0

3 years ago

Read 2 more answers

Which of the following events of the water cycle involves the biosphere:heavy rain causing a landslide , or leaves releasing wat

Stells [14]

Answer:

Explanation: Water cycles through the biosphere as part of the water cycle. ... For example, gravity also pulls water from higher elevations in mountains and hills to low lying areas, whether these areas are oceans, lakes, or simply land (in which case the water is likely absorbed by plants or evaporates).

Explanation:

Hope it helped :))

6 0

2 years ago

Calculate the concentration of H3O⁺ in a solution that contains 5.5 × 10-5 M OH⁻ at 25°C. Identify the solution as acidic, basic

harina [27]

Answer : The correct option is, (A) $1.8\times 10^{-10}M$ , basic.

Explanation : Given,

Concentration of $OH^-$ ion = $5.5\times 10^{-5}M$

First we have to calculate the pOH.

$pOH=-\log [OH^-]$

$pOH=-\log (5.5\times 10^{-5})$

$pOH=4.26$

Now we have to calculate the pH.

$pH+pOH=14\\\\pH=14-pOH\\\\pH=14-4.26=9.74$

Now we have to calculate the $H_3O^+$ concentration.

$pH=-\log [H_3O^+]$

$9.74=-\log [H_3O^+]$

$[H_3O^+]=1.8\times 10^{-10}M$

As we know that, when the pH value is less than 7 then the solution acidic in nature and when the pH value is more than 7 then the solution basic in nature.

From the pH value, 9.74 we conclude that the solution is basic in nature because the value of pH is greater than 7.

Therefore, the $H_3O^+$ concentration is, $1.8\times 10^{-10}M$ , basic.

3 0

4 years ago