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2 years ago

Which list represents the

Chemistry

1 answer:

eduard2 years ago

4 0

The list which represents the

components of the human skeleton is; Bones, tendons, ligaments, cartilage.

<h3>Skeleton</h3>

The human skeleton is defined as the internal framework of the human body. It is made up of 206 bones at adulthood stage and the bone mass in the skeleton makes up about 14%

The skeleton is divided into 2 parts:

The axial skeleton: The axial skeleton is the central unit, consisting of the skull, vertebrae, ribs.

The appendicular skeleton: It comprise the bones of the extremities

Learn more about skeleton:

brainly.com/question/9332468

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A standard solution of FeSCN2+ is prepared by combining 9.0 mL of 0.20 M Fe(NO3)3 with 1.0 mL of 0.0020 M KSCN . The standard so

Xelga [282]

Answer : The equilibrium concentration of $SCN^-$ in the trial solution is $4.58\times 10^{-8}M$

Explanation :

First we have to calculate the initial moles of $Fe^{3+}$ and $SCN^-$ .

$\text{Moles of }Fe^{3+}=\text{Concentration of }Fe^{3+}\times \text{Volume of solution}$

$\text{Moles of }Fe^{3+}=0.20M\times 9.0mL=1.8mmol$

and,

$\text{Moles of }SCN^-=\text{Concentration of }SCN^-\times \text{Volume of solution}$

$\text{Moles of }SCN^-=0.0020M\times 1.0mL=0.0020mmol$

The given balanced chemical reaction is,

$Fe^{3+}(aq)+SCN^-(aq)\rightleftharpoons FeSCN^{2+}(aq)$

Since 1 mole of $Fe^{3+}$ reacts with 1 mole of $SCN^-$ to give 1 mole of $FeSCN^{2+}$

The limiting reagent is, $SCN^-$

So, the number of moles of $FeSCN^{2+}$ = 0.0020 mmole

Now we have to calculate the concentration of $FeSCN^{2+}$ .

$\text{Concentration of }FeSCN^{2+}=\frac{0.0020mmol}{9.0mL+1.0mL}=0.00020M$

Using Beer-Lambert's law :

$A=\epsilon \times C\times l$

where,

A = absorbance of solution

C = concentration of solution

l = path length

$\epsilon$ = molar absorptivity coefficient

$\epsilon$ and l are same for stock solution and dilute solution. So,

$\epsilon l=\frac{A}{C}=\frac{0.480}{0.00020M}=2400M^{-1}$

For trial solution:

The equilibrium concentration of $SCN^-$ is,

$[SCN^-]_{eqm}=[SCN^-]_{initial}-[FeSCN^{2+}]$

$[SCN^-]_{initial}$ = 0.00050 M

Now calculate the $[FeSCN^{2+}]$ .

$C=\frac{A}{\epsilon l}=\frac{0.220}{2400M^{-1}}=9.17\times 10^{-5}M$

Now calculate the concentration of $SCN^-$ .

$[SCN^-]_{eqm}=[SCN^-]_{initial}-[FeSCN^{2+}]$

$[SCN^-]_{eqm}=(0.00050M)-(9.17\times 10^{-5}M)$

$[SCN^-]_{eqm}=4.58\times 10^{-8}M$

Therefore, the equilibrium concentration of $SCN^-$ in the trial solution is $4.58\times 10^{-8}M$

5 0

3 years ago

How many molecules are in 92.9 g of NaOH?

kirza4 [7]

2.3226678127494718

this number you could probably simplify to your own standards on your own.

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3 years ago

Identify the atomic orbitals in the C-C sigma bond in ethyne (acetylene HC-triplebond-CH)

aleksley [76]

Answer:

Explanation:

A sigma bond is formed when a hybrid orbital sp overlaps with another hybrid orbital or with s- or p- orbital

Ethylene has a structural formula of H - C≡ C- H

At the ground state; we have :

C | ⇅ | |↑ | ↑

2s 2p

At the excited state, we have:

C | ↑ | |↑ | ↑ | ↑

the hybrid orbital

C = | ↑ | ↑ |

2sp

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4 years ago

Leah is trying to determine how music affects the growth of plants. She hypothesizes that classical music will cause a plant to

Pani-rosa [81]

Leah's experiment:
A. Takes careful and regular measurements (she measures the growth every day)
B. Has a specific hypothesis and a controlled experiment (the music is the only changing variable, the growth conditions are identical, and this is what she wants to test in her hypothesis)
C. Experimental data that can be recorded and analyzed (measuring the growth of plant fits this)

So the answer must be D, since there is no mention of past research that scientists have found on this topic.

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Chromium-51 is a radioactive isotope used to label red blood cells to identify if they remain intact in the body. It has a half-

agasfer [191]

$\left[\begin{array}{cccc}0 \ days&27,7days&55,4days&\textbf{83,1days}\\&&&\\0,25mg&0,125mg&0,0625mg&\textbf{0,03125mg}\end{array}\right]$

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3 years ago

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