3 years ago

Lesson A.1 Key term crossword

Chemistry

1 answer:

Mrrafil [7]3 years ago

7 0

Answer:

agriculture

The raising of crops and animals for food, feed, fiber, fuel, or other useful products.

Explanation:

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Calculate the energy for vacancy formation in silver, given that the equilibrium number of vacancies at 800˚C (1073 K) is 3.6 ×

krek1111 [17]

Answer : The energy for vacancy formation in silver is, $1.762\times 10^{-19}J$

Explanation :

Formula used :

$N_v=N\times e^{(\frac{-E}{K\times T})}$

or,

$N=\frac{N_A\times \rho}{M}$

So,

$N_v=[\frac{N_A\times \rho}{M}]\times e^{(\frac{-E}{K\times T})}$

where,

$N_v$ = equilibrium number of vacancies = $3.6\times 10^{23}m^{-3}=3.6\times 10^{20}L^{-1}$

E = energy = ?

M = atomic weight = 107.9 g/mole

$N_A$ = Avogadro's number = $6.022\times 10^{23}mol^{-1}$

$\rho$ = density = $9.5g/cm^3=9.5g/ml=9500g/L$

T = temperature = $800^oC=273+800=1073K$

K = Boltzmann constant = $1.38\times 10^{-23}J/K$

Now put all the given values in the above formula, we get:

$3.6\times 10^{20}L^{-1}=[\frac{(6.022\times 10^{23}mol^{-1})\times 9500g/L}{107.9g/mol}]\times e^{[\frac{-E}{(1.38\times 10^{-23}J/K)\times 1073K}]}$

$E=1.762\times 10^{-19}J$

Therefore, the energy for vacancy formation in silver is, $1.762\times 10^{-19}J$

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Independent, dependent, and controlled variable?

Arlecino [84]

I would personally say a Controlled Variable because you are purposefully not spraying the other arm.

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Mona le supe te gustan

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Explanation:

its like 2 + 2=4

4+4=8

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there are 8 atoms of hydrogen

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