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Vilka [71]
3 years ago
11

Chose the statements that are TRUE from the list below Group of answer choices Ions exist alone in nature Lactate is created by

our muscles during anaerobic glycolysis, it reacts with water to form lactic acid. We add calcium carbonate to lakes after acid rain because the calcium ion is basic and will react with the acid. If Lake A has a limestone base and Lake B has a granite base, after each receive the same acid rain fall, Lake B will be more acidic than Lake A Fluorine anion is a weak base because hydrofluoric acid is a weak acid All salts are either acidic or basic after being dissolved in water.
Chemistry
1 answer:
hichkok12 [17]3 years ago
6 0

Answer:

Explanation:

1 ) Lactate is created by our muscles during anaerobic glycolysis, it reacts with water to form lactic acid  - True

2 ) We add calcium carbonate to lakes after acid rain because the calcium ion is basic and will react with the acid. True

3 )  If Lake A has a limestone base and Lake B has a granite base, after each receive the same acid rain fall, Lake B will be more acidic than Lake A : True

limestone is calcium carbonate which is basic but granite is not basic so it can not neutralise acid. So lake B remains more acidic .

4 ) Fluorine anion is a weak base because hydrofluoric acid is a weak acid False

A weak acid has strong anion . Hydrofluoric acid is weak but fluorine anion is strong.

5 ) All salts are either acidic or basic after being dissolved in water false .

Neutral salts are also found.

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At 20 ∘C the vapor pressure of benzene C6H6 is 75 torr and that of toluene C7H8 is 22 torr. Assume that benzene and toluene fo
Olegator [25]

Answer:

a) Xbenzene = 0.283

b) Xtoluene = 0.717

Explanation:

At T = 20°C:

⇒ vapor pressure of benzene (P*b) = 75 torr

⇒ vapor pressure toluene (P*t) = 22 torr

Raoult's law:

  • Pi = Xi.P*i

∴ Pi: partial pressure of i

∴ Xi: mole fraction

∴ P*i: vapor pressure at T

a) solution: benzene (b) + toluene (t)

∴ Psln = 37 torr;   at T=20°C

⇒ Psln = Pb + Pt

∴ Pb = (Xb)*(P*b)

∴ Pt = (Xt)*(P*t)

∴ Xb + Xt = 1

⇒ Psln = 37 torr = (Xb)(75 torr) + (1 - Xb)(22 torr)

⇒ 37 torr - 22 torr = (75 torr)Xb - (22 torr)Xb

⇒ 15 torr = 53 torrXb

⇒ Xb = 15 torr / 53 torr

⇒ Xb = 0.283

b) Xb + Xt = 1

⇒ Xt = 1 - Xb

⇒ Xt = 1 - 0.283

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6 0
3 years ago
A solution with a higher concentration of hydroxide ions (oh-) than hydrogen ions (h+)
Hoochie [10]
A solution with a higher concentration of hydroxide ions than hydrogen ions is basic solution.

This solution formed by Base dissolved in water and release hydroxide ions.

The PH of the solution is greater than 7
5 0
3 years ago
When collecting your solid, why should the filter paper in the Buchner funnel be wetted with some of the cold recrystallization
Mnenie [13.5K]

Answer:   It is important to wet the filter paper in the Buchner funnel first with cold re crystallization solvent before the re crystallization mixture being filtered to minimize gaps around the edges of the filter paper which can prevent mechanical impurities from passing through. This gives better filtration where most impurities can be filtered. Furthermore, it provides good vacuum.

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3 years ago
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andriy [413]

Answer:

50 g of S are needed

Explanation:

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S(s) + O₂ (g) →  SO₂ (g)

If we burn 1 mol of sulfur with 1 mol of oxygen, we can produce 1 mol of sulfur dioxide. In conclussion, ratio is 1:1.

According to stoichiometry, we can determine the moles of sulfur dioxide produced.

100 g. 1mol / 64.06g = 1.56 moles

This 1.56 moles were orginated by the same amount of S, according to stoichiometry.

Let's convert the moles to mass

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4 0
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Answer:

that is why co2 is in the power of 2ik

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