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Readme [11.4K]
3 years ago
7

Do the molecules in a desk have energy?

Chemistry
1 answer:
Harrizon [31]3 years ago
6 0
Everything requires energy to move. If the desk is moving, then it has energy. 
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What did Niels Bohr describe electrons in his atomic model
Bess [88]

Neils bohar proposed his atomic model in 1913.

He describe that's electron travel in a circular orbit surrounds the neuclus of an atom.each orbit has quantized energy and size. Energy is transmitted when an electron jumps from one to other orbit near to nucleus.and it absorb energy when it jumbs away from nucleus.he also said that these electrons are restricted to fixed orbits. In excited state of electron, they absorb or emitt photon with specific wavelength.

4 0
2 years ago
Sam investigates the reactivity of metals in air. His observations are shown below.
viva [34]

Answer:5

Explanation:

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2 years ago
Read 2 more answers
How many moles are in 5.96g of MgCO,?
nikdorinn [45]

Answer:

201.1046

hope that helped :)

6 0
2 years ago
Now you will solve the same problem as above, but using the quadratic formula instead of iterations, to show that the same value
Dafna1 [17]

Answer:

a: 1

b: 4.5x10⁻⁴

c: 1.125x10⁻⁶

[H₃O⁺] = 0.000859M

Explanation:

As HNO₂ is a weak acid, its equilibrium in water is:

HNO₂(aq) + H₂O(l) ⇄ H₃O⁺(aq) + NO₂⁻(aq)

Equilibrium constant, ka, is defined as:

ka = 4.5x10⁻⁴ = [H₃O⁺] [NO₂⁻] / [HNO₂] <em>(1)</em>

Equilibrium concentration of each specie are:

[HNO₂] = 0.00250M - x

[H₃O⁺] = x

[NO₂⁻] = x

Replacing in (1):

4.5x10⁻⁴ = x × x / 0.00250M - x

1.125x10⁻⁶ - 4.5x10⁻⁴x = x²

0 = x² + 4.5x10⁻⁴x - 1.125x10⁻⁶

As the quadratic equation is ax² + bx + c = 0

Coefficients are:

a: 1

b: 4.5x10⁻⁴

c: 1.125x10⁻⁶

Now, solving quadratic equation:

x = -0.0013 → False answer, there is no negative concentrations.

<em>x = 0.000859</em>

As [H₃O⁺] = x; <em>[H₃O⁺] = 0.000859M</em>

I hope it helps!

6 0
2 years ago
4. Think of the solids and liquids that you encounter every day. In what ways are solids and liquids similar? In what ways are t
Taya2010 [7]

Answer:

They both are the same thing which is water but they are just in different forms.

Explanation:

A solid is water that is frozen and a liquid is just water.

3 0
2 years ago
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