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3 years ago

How many photons are produced in a laser pulse of 0.430j at 679nm.

Chemistry

2 answers:

Shkiper50 [21]3 years ago

8 0

Couldnt you have searched tabt up

Oliga [24]3 years ago

3 0

5.65 ⋅ 10 17 photons

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AnnyKZ [126]

Answer:

opposite

Explanation:

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3 years ago

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What stress would shift the equilibrium position of the following system to the right?

yanalaym [24]

Answer:

Decreasing the concentration of N2O3

Explanation:

This is because the products on the right of the reaction occupy more space. One (1) mole of NO and another mole of NO2 will occupy more space than the one (1) mole of N2O3. Therefore decreasing the concentration of N2O3 will shift the reaction to the right because the products will have more space to occupy – hence favoring equilibrium.

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How to tell if a reaction is exothermic or endothermic from an equation?

mart [117]

Hope this table might help!

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3 years ago

What happens to water when it warms above 4 C

xxMikexx [17]

At 4 °C, the clusters start forming. The molecules are still slowing down and coming closer together, but the formation of clusters makes the molecules be further apart. Thus, the density of water is a maximum at 4 °C.

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3 years ago

To indicate the pH of a substance, one can use a dye that is both an acid and that appears as different colors in its protonated

PIT_PIT [208]

Answer:

<em>The pH of the solution is 7.8</em>

Explanation:

The concentration of the solution is 0.001M and the dye could be in its protonated and deprotonated forms. If the concentration of the protonated form [HA] is 0.0002 M the concentration of the deprotonated form will be the subtraction between the concentration of the bye and the concentration of the protonated form:

[A-] = 0.001M - 0.0002M = 0.0008M

Also, the Henderson-Hasselbalch equation is

$pH = pKa + Log \frac{[A^{-}]}{[HA]}$

this equation shows the dependency between the pH of the solution, the pKa and the concentration of the protonated and deprotonated forms. Thus, replacing in the equation

$pH = 7.2 + Log \frac{0.0008M}{0.0002M} = 7.8$

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3 years ago