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julsineya [31]
3 years ago
12

Machines are never 100 percent efficient because some work is used to overcome friction and inertia. True False

Chemistry
2 answers:
ElenaW [278]3 years ago
7 0
False,
machines constantly mess up
Y_Kistochka [10]3 years ago
3 0
This is wrong because machines can make mistakes that why we fix it
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Solid solutions that are mixtures of elements with metallic properties are known as_____
marshall27 [118]
Alloys. hope this helps.
4 0
3 years ago
How many atoms are in 5 grams of H2O?
mojhsa [17]

Hello!

We know that by the Law of Avogrado, for each mole of substance we have 6.02 * 10²³ atoms, if:

The molar mass of water (H2O)

H = 2 * (1u) = 2u

O = 1 * (16u) = 16u

---------------------------

The molar mass of H2O = 2 + 16 = 18 g / mol

If:

1 mol we have 6.02 * 10²³ atoms

1 mole of H2O we have 18 g

Then we have:

18 g ------------- 6.02 * 10²³ atoms

5 g -------------- x

\dfrac{18}{5} = \dfrac{6.02*10^{23}}{x}

18*x = 5*6.02*10^{23}

18\:x = 3.01*10^{24}

x = \dfrac{3.01*10^{24}}{18}

\boxed{\boxed{x \approx 1.672*10^{23}\:atoms}}\end{array}}\qquad\checkmark

I Hope this helps, greetings ... DexteR! =)

6 0
3 years ago
Read 2 more answers
What particle has the most energy
Katyanochek1 [597]

Answer:

electrons

Explanation:

By particles im assuming you mean subatomic. The particle with the most energy in this case would be electrons.

5 0
3 years ago
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Cathode-electrolyte interphase in lithium batteries revealed by cryogenic electron microscopy. matte
Ksju [112]

Cryo-EM is used to preserve and characterize cycled positive electrodes. Under regular cycling conditions, there isn't an intimate coating layer like CEI.A small electrical short can cause a stable conformal CEI to form in place. The conformal CEI's chemistry is revealed by EELS and cryo-(S)TEM.

It has been assumed that the intimate coating layer generated on the positive electrode, known as cathode electrolyte interphase (CEI), is crucial. However, there are still numerous questions about CEI. This results from the absence of useful instruments to evaluate the chemical and structural characteristics of these delicate interphases at the nanoscale. Here, using cryogenic electron microscopy, we establish a methodology to maintain the natural condition and directly see the interface on the positive electrode.

Learn more about Cathode electrolyte interphase here:

brainly.com/question/861659

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4 0
1 year ago
If the a of a monoprotic weak acid is 2. 6×10−6, what is the ph of a 0. 33 m solution of this acid?
yawa3891 [41]

The pH of the monoprotic weak acid is 2.79.

<h3>What are weak acids?</h3>

The weak acids are the acids that do not fully dissociate into ions in the solution. Strong acids fully dissociate into ions.

The chemical reaction is HA(aq) ⇄ A⁻(aq) + H⁺(aq).

c (monoprotic acid) = 0.33 M.

Ka = 1.2·10⁻⁶

[A⁻] = [H⁺] = x

[HA] = 0.33 M - x

Ka = [A⁻]·[H⁺] / [HA]

2. 6 × 10⁻⁶ = x² / (0.33 M - x)

Solve quadratic equation: [H⁺] = 0.000524 M.

pH = -log[H⁺]

pH = -log(0.000524 M)

pH = 2.79

Thus,  the pH of the monoprotic weak acid is 2.79

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5 0
2 years ago
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