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larisa [96]
3 years ago
10

Answers please :) i highly need them

Chemistry
1 answer:
Afina-wow [57]3 years ago
3 0

FOOD AND WATER AND CLOTHES


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' A compound has the same properties as the elements it is made from.' True or false.Why?
Vladimir [108]

Answer:

False

Explanation:

That's because elements in a compound combine and become an entirely different substance with its own unique properties.

8 0
3 years ago
"How much NH4Cl, when present in 2.00 liters of 0.200 M ammonia, will give a solution with pH = 8.20? For NH3, Kb = 1.8 x 10-5"
Andru [333]

Answer:

245.66g of NH₄Cl is the mass we need to add to obtain the desire pH

Explanation:

The mixture of NH3/NH4Cl produce a buffer. We can find the pH of a buffer using H-H equation:

pH = pKa + log [A⁻] / [HA]

<em>Where [A⁻] is the molar concentration of the base, NH₃, and [HA] molar concentration of the acid, NH₄⁺. This molar concentration can be taken as the moles of each chemical</em>

<em />

First, we need to find pKa of NH₃ using Kb. Then, the moles of NH₃ and finally replace these values in H-H equation to solve moles of NH₄Cl we need to obtain the desire pH.

  • <em>pKa NH₃/NH₄⁺</em>

pKb = - log Kb

pKb = -log 1.8x10⁻⁵ = <em>4.74</em>

pKa = 14 - pKb

pKa = 14 - 4.74

pKa = 9.26

  • <em>Moles NH₃</em>

<em>2.00L ₓ (0.200mol NH₃ / L) = 0.400 moles NH₃</em>

  • <em>H-H equation:</em>

pH = pKa + log [NH₃] / [NH₄Cl]

8.20 = 9.26 + log [0.400 moles] / [NH₄Cl]

-1.06 =  log [0.400 moles] / [NH₄Cl]

0.0087 =  [0.400 moles] / [NH₄Cl]

[NH₄Cl] = 0.400 moles / 0.0087

[NH₄Cl] = 4.59 moles of NH₄Cl we need to add to original solution to obtain a pH of 8.20. In grams (Using molar mass NH₄Cl=53.491g/mol):

4.59 moles NH₄Cl ₓ (53.491g / mol) =

<h3>245.66g of NH₄Cl is the mass we need to add to obtain the desire pH</h3>

<em />

3 0
4 years ago
What is the answer?
Dmitry_Shevchenko [17]

as a heterogeneous mixture

Explanation:

because I just know that it is

6 0
3 years ago
The dissociation of a/an ________ releases hydrogen ions and increases the concentration of hydrogen ions in a solution.
Crank
Acid...hope it helps
5 0
3 years ago
Molecular formula of a certain ionic compound is XY2 and X is a metal. State group to which elements X and Y belong to in the pe
emmasim [6.3K]

Answer: m Most likely Group2 metals and Group 17 non-ktta                                                                

Explanation:

A little more information is needed to be certain, but the likely answer is that X belongs to Group 2 and Y belongs to Group 17.  Group 2 metals (Be, Mg, Ca, Sr, Ba, etc.) are all divalent.  They gave rive up 2 electrons each to return to a full shell.  Group 17 elements (e,g, F, Cl, Br, I, etc.) all require 1 electron to reach a full valence shell.  That would make the proportion 1X to 2Y, or XY2.  It is possible that a metal outside of Group 2 would also have a valency of 2.  Iron(II) forms FeCl2, for example.

3 0
3 years ago
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