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3 years ago

Which intermolecular force would affect the boiling point the least?

Chemistry

2 answers:

Maksim231197 [3]3 years ago

4 0

Answer:

I'm pretty sure its h bonding. however I could very welp see it being Van der Waals

sesenic [268]3 years ago

4 0

Answer: Van der Waals forces

Explanation: trust me i tried the other dudes answer and I got it wrong.

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I need help with this please

ELEN [110]

Answer:

I thinkk its B. that its greater. Sry if im wrong

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Which group is in the leftmost column on the periodic table?

Gelneren [198K]

Answer: alkali metals

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3 years ago

Hydrogen atoms absorb energy so that the electrons are excited to n=4. Calculate the wavelength, in

FromTheMoon [43]

Answer:

the wavelength, in nm, of the photon is 487.5 nm

Explanation:

Given:

n = 4 (excited)

n = 2 (relaxes)

Question: Calculate the wavelength, in nm, λ = ?

First, it is important to calculate the energy of the electron when it excited and then when it relaxes.

$E_{1} =\frac{-13.6}{n^{2} } =\frac{-13.6}{4^{2} } =-0.85eV$ (excited)

$E_{2} =\frac{-13.6}{2^{2} } =-3.4eV$ (relaxes)

The change of energy

ΔE = E₁ - E₂=-0.85 - (-3.4) = 2.55 eV = 4.08x10⁻¹⁹J

For a photon, the wavelength emitted

$\lambda =\frac{hc}{delta(E)}$

Here

h = Planck's constant = 6.63x10⁻³⁴J s

c = speed of light = 3x10⁸m/s

Substituting values:

$\lambda =\frac{6.63x10^{-34}*3x10^{8} }{4.08x10^{-19} } =4.875x10^{-7} m=487.5nm$

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3 years ago

Which arrow or arrows represent reactions that demonstrate a conservation of mass and energy? Explain your answer

rewona [7]

I think it would be the sun because it’s the one giving energy to most things, and if you haven’t answered it yet you can put the sun because it’s giving energy to the plans and the environment and it’s the the sun was the effect of the whole thing, sorry if I didn’t help

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A person has a mass of 70.0 kg on Earth,

Sever21 [200]

I would probably be B

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