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3 years ago

Write each number in standard notation

Chemistry

2 answers:

Agata [3.3K]3 years ago

8 0

21. 26600
22. .015
23. .775
24. 83000000
25. 95000000
26. 171000000
27. 0009
just move the decimal points and add zeros its pretty simple and remember google exists and so does a calculator!! :)

alexandr402 [8]3 years ago

5 0

21. 26,600
22. 0.015
23. 0.775
24. 83,000,000
25. 95,000,000
26. 17,100,000
27. 0.0009
28. 3,800
29. 0.000075
30. 4

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Answer:

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Bases → Water from equilibrium 1 and ammonia from equilibrium 2.

In 1st equilibrium, H₃O⁺ is the conjugate acid and HCO₃⁻ the conjugate base.

In 2nd equilibrium, NH₄⁺ is the conjugate acid, and OH⁻, the conjugate base.

Explanation:

By the Bronsted-Lowry you know that acids are the one that release protons and base are the ones that catch them.

For the first equilibrium:

H₂CO₃(aq) + H₂O(l) ⇄ H₃O⁺(aq) + HCO₃⁻(aq)

Carbonic acid is the acid → It donates the proton to water, so the water becomes the base. As H₂CO₃ is the acid, the bicarbonate is the conjugate base (it can accept the proton from water to become carbonic acid, again) and the hydronium is the conjugate acid (it would release the proton to become water).

For the second equilibrium:

NH₃(aq) + H₂O(l) ⇄ NH₄⁺ (aq) + OH⁻(aq)

This is the opposite situation → Water relase the proton to ammonia, that's why water is the acid and NH₃, the base (it accepted to become ammonium). The NH₄⁺ is the conjugate acid (it can release the H⁺ to become ammonia) and the OH⁻ is the conjugate base (It can accept the proton to become water, again).

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Answer:

See attached picture.

Explanation:

Hello.

In this case, since butane has two common occurring structures, n-butane and isobutane, there is a way in which the tert-butyl radical can be formed upon the removal of a hydrogen from the isobutane form of butane as shown on the attached picture, wherein you can see that the radical is named by "tert" since the central carbon is bonded to three carbon atoms, that is why we classify it as tertiary. Moreover, it is a radical due to the presence of the bolded dot next to the tertiary carbon suggesting that it is very likely to bond with an other atom.

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3 years ago

How much energy would be absorbed as heat by 25 g of iron when heated from 295 K to 306 K?

defon

Answer:

1.2 × 10² J

Explanation:

Given data

Mass of iron (m): 25 g

Initial temperature: 295 K

Final temperature: 306 K

The amount of heat (Q) that a substance absorbs depends on its specific heat capacity (c), which is the amount of heat energy required to raise the temperature of a substance per unit of mass. It can be calculated through the following expression. <em>(cFe = 0.444 J/g.K)</em>

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