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3 years ago

What causes a metal spoon in a pot of boiling soup to become hot? And why?

1 answer:

6 0

Conduction causes it to become hot, the molecules in the hot soup want to be on the cold spoon so they move to it, making the spoon hot.

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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:

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

8 0

3 years ago

One mole of carbon, sulfur, and aluminum, respectively. Which jar contains the most atoms?

forsale [732]

Answer:

sulphur cuz its weight is 32.065g

Explanation:

this is correct

plz mark me brainliest

7 0

3 years ago

Read 2 more answers

True or False: The atoms that make up the element oxygen are exactly the same as the atoms that make up the element hydrogen.

EleoNora [17]

TRUE i hope this helps let me know if you need more help

4 0

3 years ago

Read 2 more answers

Identify the tectonic plate boundaries.

Andreyy89

Divergent boundaries and convergent boundaries are the opposite processes that occurs in the tectonic plates.

<h3>Difference between Divergent and convergent boundaries </h3>

Divergent boundaries are the regions where new crust is formed when the plates pull away from each other while on the other hand, Convergent boundaries are the regions where crust is destroyed when one plate dives over another.

So we can conclude that Divergent boundaries and convergent boundaries are the opposite processes that occurs in the tectonic plates.

Learn more about tectonic plate here: brainly.com/question/1162125

7 0

3 years ago

What chemical process is responsible for the smell of vinegar in an old bottle of aspirin?

Oliga [24]

Chemical process is responsible for the smell of vinegar in an old bottle of aspirin is Hydrolysis of ester i.e. Aspirin.

Aspirin reacts with water leading to the formation of Acetic acid which is a Carboxylic acid derivative.

Aspirin on Hydrolysis forms Acetic acid and Salicylic acid.

The reaction shows up as a fizz when aspirin is added in water.

Aspirin is called Acetyl Salicylic acid and it helps to reduce:

Inflammation
Pain
Fever
Headache
Arthritis
Muscle pain
Tooth pain

Acetic acid or Ethanoic acid is a colorless liquid. It is an important carboxylic acid. It smells like vinegar.

Acetic acid is used for production of following:

Vinyl Acetate
Insecticides
Rubber
Acetic anhydride

Salicylic acid is a bitter compound which is colorless. It reduces acne and opens up the skin pores.

Learn more about Aspirin here, brainly.com/question/23878261

#SPJ4

5 0

2 years ago