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steposvetlana [31]
3 years ago
11

Please help!! Question on the picture

Chemistry
1 answer:
garik1379 [7]3 years ago
5 0

D) You need more information to figure this out.

The atom has three protons, so you know from the Periodic Table that the atom is lithium, Li.

However, there are two stable isotopes of Li.

The most common isotope has <em>four</em> neutrons, and the other one has three.

You have <em>no way of knowing</em> which isotope the diagram represents.

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PLS HELP! 50 PTS!
ioda

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The average kinetic energy of the gas particles is greater in container B because it has a higher temperature.

Explanation:

<em>The correct option would be that the average kinetic energy of the gas particles is greater in container B because it has a higher temperature.</em>

<u>According to the kinetic theory of matter, the temperate of a substance is a measure of the average kinetic energy of the molecules of substance. In other words, the higher the temperature of a substance, the higher the average kinetic energy of the molecules of the substance.</u>

In the illustration, the gas in container B showed a higher temperature than that of container A as indicated on the thermometer, it thus means that the average kinetic energy of the molecules of gas B is higher than those of gas A.

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3. What kind of mixture does each mixture have?​
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Answer:

heterogeneous and homogeneous

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4 years ago
A laser pulse with wavelength 545 nm contains 4.85 mJ of energy. How many photons are in the laser pulse?
dusya [7]

<u>Given</u>:

Wavelength (λ) of the laser pulse = 545 nm = 5.45 * 10⁻⁹ m

Total energy of pulse = 4.85 mJ

<u>To determine:</u>

The number of photons in the laser of a given energy

<u>Explanation:</u>

Energy per photon (E) = hc/λ

where h = planck's constant = 6.626 *10⁻³⁴ Js

C = speed of light = 3*10⁸ m/s

λ = wavelength

E = 6.626 *10⁻³⁴ Js* 3*10⁸ms-1 /5.45 * 10⁻⁹ m = 3.65 * 10⁻¹⁹ J

Now,

# photons = total energy/Energy per photon

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Ans: the laser pulse contains 1.32 * 10¹⁶ photons

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