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8090 [49]
3 years ago
6

Explain what will happen to the crystal when cations are pushed they face each other and the movement is simulating an applied f

orce
Chemistry
1 answer:
Mademuasel [1]3 years ago
6 0

Answer:

When an ionic crystal breaks, it tends to do so along smooth planes because ... ions are forced near each other and the repulsive force causes the crystal to shatter. ... Cations move to one electrode, while anions move to the other, ... Diagram of ions in an ionic solution when an electrical current is applied.

Explanation:

Hope this helped

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Answer:

it's either b or d

Explanation:

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What is the value of freezing point depression of a solution of 15.0g of NaCl in 250g of water?
kobusy [5.1K]

Answer:

-3.82ºC is the freezing point of solution

Explanation:

We work with the Freezing point depression to solve the problem

ΔT = m . Kf . i

ΔT = Freezing point of pure solvent - freezing point of solution

Let's find out m, molality (moles of solute in 1kg of solvent)

15 g / 58.45 g/mol = 0.257 moles of NaCl

NaCl(s) → Na⁺ (aq) + Cl⁻(aq)

i = 2 (Van't Hoff factor, numbers of ions dissolved)

m = mol /kg → 0.257 mol / 0.250kg = 1.03 m

Kf = Cryoscopic constant → 1.86 ºC/m (pure, for water)

0ºC - Tºf = 1.03m . 1.86ºC/m . 2

Tºf  = -3.82ºC

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Why must living things rely on thousands of catalysts for chemical reactions necessary for life?
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If a plant is slow to photosynthesize and grow in a habitat high in competition for sunlight real estate, other autotrophs will surely take over.
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When metallic sodium is dissolved in liquid sodium chloride, electrons are released into the liquid. These dissolved electrons a
qaws [65]

Answer:

The edge of the length is \mathbf{L = 8.54 \times 10^{-10} \ m}

Explanation:

From the given information:

The associated energy for a particle in three - dimensional box can be expressed as:

E_n = \dfrac{h^2}{8mL^2}(n_x^2+n_y^2+n_z^2)

here;

h = planck's constant = 6.626 \times 10^{-34} \ Js

n_i = the quantum no in a specified direction

m = mass (of particle)

L = length of the box

At the ground state n_x = n_y = n_z=1

The energy at the ground state can be calculated by using the formula:

E_1 =\dfrac{3h^2}{8mL^2}

At first excited energy level, one of the quantum values will be 2 and the others will be 1.

Thus, the first excited energy will be: 2,1,1

∴

E_2 =\dfrac{(2^2+1^2+1^2)h^2}{8mL^2}

E_2 =\dfrac{(4+1+1)h^2}{8mL^2}

E_2 =\dfrac{(6)h^2}{8mL^2}

The transition energy needed to move from the ground to the excited state is:

\Delta E= E_2 - E_1

\Delta E= \dfrac{6h^2}{8mL^2}-  \dfrac{3h^2}{8mL^2}

\Delta E= \dfrac{3h^2}{8mL^2}} ----- (1)

Recall that:

the  wavelength identified with the electronic transition is: 800 nm

800 nm = 8.0  × 10⁻⁷ m

However, the energy-related with the electronic transition is:

\Delta E =\dfrac{hc}{\lambda}

\Delta E =\dfrac{6.626 \times 10^{-34} \times 2.99 \times 10^8}{8.0 \times 10^{-7} }

\Delta E =2.48 \times 10^{-19}  \ J

Replacing the value of \Delta E in (1); then:

2.48 \times 10^{-19}= \dfrac{3h^2}{8mL^2}}

Making the edge length L the subject of the formula; we have:

L = \sqrt{\dfrac{3h^2}{8m \times2.48 \times 10^{-19}} }

L = \sqrt{\dfrac{3\times (6.626 \times 10^{-34})^2}{8(9.1 \times 10^{-31} ) \times2.48 \times 10^{-19}} }

\mathbf{L = 8.54 \times 10^{-10} \ m}

Thus, the edge of the length is \mathbf{L = 8.54 \times 10^{-10} \ m}

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