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3 years ago

Help I have no idea what I'm doing!!

Chemistry

2 answers:

harkovskaia [24]3 years ago

3 0

You have to solve it and color in the numbers i guess? It doesnt show all of the work

lyudmila [28]3 years ago

3 0

1. 605.952 g
2.
3.1.36 molecules
4.0.29 mols
5.0.955 mols
6.5.336 molecules

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Match the compounds as organic (O) or inorganic (I)..

zloy xaker [14]

Inorganic = H2O, NO2

Organic = C3H6, C22H24, CH4

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3 years ago

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Nickel has an FCC structure and an atomic radius of 0.124 nm. (12 points) a. What is the coordination number? b. Calculate the A

LekaFEV [45]

Answer:

a)CN=12

b)APF=74 %

c)a=0.35 nm

d)ρ=9090.9 $Kg/m^3$

Explanation:

Given that

Nickel have FCC structure

We know that in FCC structure ,in FCC 8 atoms at corner with 1/8 th part in one unit cell and 6 atoms at faces with 1/2 part in one unit cell .

Z=8 x 1/8 + 1/2 x 6 =4

Z=4

Coordination number (CN)

The number of atoms which touch the second atoms is known as coordination number.In other word the number of nearest atoms.

CN=12

Coordination number of FCC structure is 12.These 12 atoms are 4 atoms at the at corner ,4 atoms at 4 faces and 4 atoms of next unit cell.

APF

$APF=\dfrac{Z\times \dfrac{4}{3}\pi R^3}{a^3}$

We know that for FCC

$4R=\sqrt{2}\ a$

Now by putting the values

$APF=\dfrac{4\times \dfrac{4}{3}\pi R^3}{\left(\dfrac{4R}{\sqrt2}\right)^3}$

APF=0.74

APF=74 %

$4R=\sqrt{2}\ a$

$4\times 0.124=\sqrt{2}\ a$

a=0.35 nm

Density

$\rho=\dfrac{Z\times M}{N_A\times a^3}$

We know that M for Ni

M=58.69 g/mol

a=0.35 nm

$N_A=6.023\times 10^{23}\ atom/mol$

$\rho=\dfrac{Z\times M}{N_A\times a^3}$

$\rho=\dfrac{4\times 58.69}{6.023\times 10^{23}\times( 0.35\times 10^{-9})^3}\ g/m^3$

ρ=9090.9 $Kg/m^3$

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3 years ago

1. Which liquid sample is a pure substance?

IRISSAK [1]

The whole Activity , poem and paragraph is missing in the question.

Answer:

(1) Liquid A

(2) Solid A

Explanation:

Using this part of the given poem

Substances and mixtures behave differently,

During boiling and melting most especially

Boiling point of substance is fixed while mixture is not

Substance melts completely but mixture does not

The boiling point of the Pure substance remain fixed after reaching its boiling point this is shown by Liquid A

Solid A is melting completely so Solid A is a pure substance.

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If a sound wave speeds up and its frequency does not change, what happens to the wavelength?

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Answer: No, the speed of propagation is constant in a given medium; only the wavelength changes as the frequency changes.

Explanation:

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The chemical formula for carbon tetrafluoride is CF4

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