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Novosadov [1.4K]
3 years ago
11

Coal is a naturally forming rock. It is formed millions of years ago from the remains of plants. Coal is mined from the earth an

d then burned for energy. Which sentence from the passage describes how people change the earth’s surface?
Coal is a naturally forming rock.

It is formed millions of years ago from the remains of plants.

Coal is mined from the earth and then burned for energy.​
Chemistry
1 answer:
Feliz [49]3 years ago
4 0

Answer:

Coal is mined from the earth and then burned for energy

Explanation:

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The principal quantum number (n): specifies the principal shell of the orbital.

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The numerals, called essential quantum numbers, imply strength degrees as well as the relative distance from the nucleus. A 1s electron occupies the energy stage nearest the nucleus.

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Hydrobromic acid, HBr, is a strong acid. Hydrofluoric acid, HF, is a weak acid. If you prepared equal
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In this case, HBr, being a strong acid, would ionize completely in water to yield H+ and Br- ions. However, HF, being a weak acid, would ionize only to a limited extent: some of the HF molecules will ionize into H+ and F- ions, but most of the HF will remain undissociated.

pH is, by definition, a measurement of the concentration of hydrogen ions in solution (pH = -log[H+]). A higher concentration of hydrogen ions gives a lower pH, while a lower concentration of hydrogen ions gives a higher pH. At 25 °C, a pH of 7 indicates a neutral solution; a pH less than 7 indicates an acidic solution; and a pH greater than 7 indicates a basic solution.

If we have equal concentrations of HBr and HF, then the HBr solution will have a greater concentration of hydrogen ions in solution than the HF solution. Consequently, the pH of the HBr solution will be less than the pH of the HF solution.

Choice A is incorrect: Strong acids like HBr dissociate completely, not partially.

Choice B is incorrect: While the initial concentration of HBr and HF are the same, the H+ concentration in the HBr solution is greater. Since pH is a function of H+ concentration, the pH of the two solutions cannot be the same.

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