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3 years ago

An electron in a hydrogen atom relaxes to the n=4 level, emitting light of 74 THz.

1 answer:

6 0

Delta E = Ef - Ei
E = energy , h = plank constant , v = frequency
h= 6.626 * 10 ^-34 j*s , T = 10 ^ 12 , v = 74 * 10 ^12 Hz , Hz = s^-1

E = ( 6.626 * 10^ -34 j*s) ( 74 * 10 ^ 12 s^ -1 ) = 4.90 * 10 ^ -20 J
Delta E = Ef - Ei
-4.90 * 10 ^ -20 J = -2.18 * 10 ^ -18J ( 1/4 ^2 - 1/x ^2)
0.0225 = 0.0625 - ( 1/x ^ 2)
0.225 - 0.0625 = - 1/ x ^ 2

- 0.0400 = - 1/x ^2 = -1 / - 0.0400 = x^2
25 = x^2
x = 5

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Balance the following skeleton reaction and identify the oxidizing and reducing agents: Include the states of all reactants and

N76 [4]

Answer:

Oxidizing agent - CrO4^2-

Reducing agent- N2O

Explanation:

Let us look at the equation closely;

CrO4^2- (aq) + 3N2O(g) ------------> Cr^3+ (aq) + 3NO(g) [acidic]

The reduction half equation is;

CrO4^2- (aq) + 3e -------->Cr^3+ (aq)

Oxidation half equation is;

3N2O(g) ------>3 NO(g) +3 e

Note that the oxidizing agent participates in the reduction half equation while the reducing agent participates in the oxidation half equation as seen above.

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2 years ago

All of the following are agents of mechanical weathering EXCEPT ___________. wind temperature water gravity

Iteru [2.4K]

Gravity: that's a force.

3 0

3 years ago

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EastWind [94]

Explanation:

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3 0

2 years ago

Find the percent composition for SF6<br> S =? %<br> F =? %

goldenfox [79]

Answer:

S = 21.92 %

F = 78.08 %

Explanation:

To find the percent composition of each element in SF6, we must find the molar mass of SF6 first.

Molar mass of SF6 = 32 + 19(6)

= 32 + 114

= 146g/mol

mass of Sulphur (S) in SF6 = 32g

mass of Fluorine (F) in SF6 = 114g

Percent composition = mass of element/molar mass of compound × 100

- % composition of S = 32/146 × 100 = 21.92%.

- % composition of F = 114/146 × 100 = 78.08%.

6 0

2 years ago

The substances below are listed by increasing specific heat capacity value. Starting at 30.0 °C, they each absorb 100 kJ of ther

timama [110]

Answer:

Silver, 0.239 J/(g °C)

Explanation:

The heat change is related to specific heat as given by the formula;

Heat change = mass of substance × specific heat × change in temperature

Therefore; considering same amount of substance or equal masses and have the same initial temperature.

The change in temperature will be inversely proportional to the specific heat.
Therefore; the higher the specific heat lower the temperature change.
Hence, the change in temperature will be highest for the substance with the lowest specific heat.

Therefore; the one that will increase in temperature the most is Silver

7 0

3 years ago