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d1i1m1o1n [39]
2 years ago
8

Which MOST CLOSELY identifies a theme in this passage?

Chemistry
1 answer:
Delicious77 [7]2 years ago
8 0

Answer:

B)

Explanation:

It is the theme of the passage.

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why is it less effective to wash an insoluble precipitate with 15 ml of water once than it is to wash the precipitate with 3 ml
MArishka [77]

It is less effective to wash an insoluble precipitate with 15 ml of water once than it is to wash the precipitate with 3 ml of water 5 times because commonly, when you clean an <span>indissoluble precipitate with water, the water will not be completely saturated with contaminates. Therefore, the absorption of the contaminates would lower with each wash, since if you only washed it once with a bigger amount or volume of water, it’d become less contaminated with the wash water but it wouldn’t get rinsed numerous times.</span>

6 0
2 years ago
2.1. The lithium ion in a 250,00 mL sample of mineral water was
juin [17]

Answer:

11482 ppt of Li

Explanation:

The lithium is extracted by precipitation with B(C₆H₄)₄. That means moles of Lithium = Moles B(C₆H₄)₄. Now, 1 mole of B(C₆H₄)₄ produce the liberation of 4 moles of EDTA. The reaction of EDTA with Mg²⁺ is 1:1. Thus, mass of lithium ion is:

<em>Moles Mg²⁺:</em>

0.02964L * (0.05581mol / L) = 0.00165 moles Mg²⁺ = moles EDTA

<em>Moles B(C₆H₄)₄ = Moles Lithium:</em>

0.00165 moles EDTA * (1mol B(C₆H₄)₄ / 4mol EDTA) = 4.1355x10⁻⁴ mol B(C₆H₄)₄ = Moles Lithium

That means mass of lithium is (Molar mass Li=6.941g/mol):

4.1355x10⁻⁴ moles Lithium * (6.941g/mol) = 0.00287g. In μg:

0.00287g * (1000000μg / g) = 2870μg of Li

As ppt is μg of solute / Liter of solution, ppt of the solution is:

2870μg of Li / 0.250L =

<h3>11482 ppt of Li</h3>

4 0
2 years ago
On a separate sheet of paper, write the formulas for the missing components of these neutralization reactions.
Fofino [41]
The  formula  of  the  missing  component  are  a   follows

HBr  +  KOH  ------>  KBr  +  H2O

H2SO4  +  2NH4OH--------> (NH4)2SO4  +  2H2O

2HNO3     +  Mg(OH)2  --------->  Mg(NO3)2  +  2  H2O
4 0
2 years ago
Read 2 more answers
Determine the equilibrium constant, keq, at 25°c for the reaction 2br– (aq) + i2(s) br2(l) + 2i– (aq).
Travka [436]
Electrochemical cell representation for above reaction is,

Br-/Br2//I2/I-

Reaction at Anode: Br2 + 2e-   →    2Br-               (1)
Reaction at Cathode: 2I-            →  I2   + 2e-          (2)

Standard reduction potential for Reaction 1 =  Ered(anode) = 1.066 v
Standard reduction potential for Reaction 2 = Ered(cathode) = 0.535 v

Eo cell = Ered(cathode)  -  Ered(anode)
            = 0.535 - 1.066
            = -0.531v

Now, we know that ΔGo = -nF (Eo cell)        ..............(3)
Also, ΔGo = RTln(K)         ..........(4)

Equation 3 and 4 we get,

ln (K)   = nF (Eo cell)  / RT
           = 2 X 96500 X (-0.531)/ (8.314 X 298)

∴ K = 1.085 X 10^-18.


5 0
2 years ago
Annie is trying to attract her metal pencil box with a magnet from the other side of her desk. The pencil box does not move. Wha
elena55 [62]

Answer:D

Explanation:because The farther an object is from a magnet are apart from each other, the weaker the repulsion force will be.

8 0
2 years ago
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