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4 years ago

Do you expect potassium iodide to be soluble in cyclohexane

2 answers:

8 0

Answer is: no, <span>potassium iodide has low solubility in cyclohexane.
</span>Potassium iodide (KI) is ionic compound, salt, that dissolve good in polar solvents (for example water), but it is very low soluble in non-polar solvents (in this example cyclohexane C₆H₁₂).
<span>Cyclohexane has zero net polarity, because it is a symmetric molecule, with sp2 hybridization of carbon.</span>

vekshin14 years ago

6 0

Answer:

KI is not expected to be soluble in cyclohexane

Explanation:

KI is an ionic solid. In crystal of KI, $K^{+}$ and $I^{-}$ ions are held together through coloumbic attraction force.
Cyclohexane is a non-polar solvent. Only van der waal force exists between cyclohexane molecules.
During dissolution of KI in cyclohexane, cyclohexane molecules exerts only van der waal force to KI molecules.
But this weak van der waal force cannot overcome the coloumbic attraction force exists between KI molecules during dissolution.
Hence KI is not expected to be soluble in cyclohexane.

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A 1.00 L flask was filled with 2.00 mol gaseous SO2 and 2.00 mol gaseous NO2 and heated. After equilibrium was reached, it was f

Nataly_w [17]

Answer:

Explanation:

SO3 (g) + NO (g) U SO2 (g) + NO2 (g)

occurs under these conditions. Calculate the value of the equilibrium constant, Kc, for the above reaction.

SO3 (g) + NO (g) U SO2 (g) + NO2 (g)

Initial (M) 2.00 2.00 0 0

Change (M) −x −x +x +x

Equil (M) 2.00 − x 2.00 − x x x

2 2 c 3

c 2

[SO ][NO ]

[SO ][NO]

(2.00 )

= −

x K

Since the problem asks you to solve for Kc, it must indicate in the problem what the value of x is. The concentration of

NO at equilibrium is given to be 1.30 M. In the table above, we have the concentration of NO set equal to 2.00 − x.

2.00 − x = 1.30

x = 0.70

Substituting back into the equilibrium constant expression:

2c 2 2c 2

(2.00 )

(0.70)

(2.00 0.70)

= − = −

x KxK

Kc = 0.290

6 0

4 years ago

In this experiment, a calibration curve, often called a Beer's Law plot, will be made. A calibration curve should have which of

mr_godi [17]

Answer:

B, C and F are true, see explanation below.

Explanation:

Beer´s law is given by the formula:

A = εcl, where A = Absorbance,

ε = molar extinction coefficient,

c = concentration in mol/L (M), and

l = path length of the cuvette containing the sample,

Now the usefulness of this relation is that if we plot the Absorbance vs concentration, we get a straight line since the Beer equation has the form y = mx + b.After the slope and y intercept have been determined, we can determine an unknow concentration of the substance by measuring its absorbance.

This relation is valid for low concentration, and there are deviations from it.

We are now ready to answer this question with this brief introduction:

A. Absorbance is plotted on the x-axis

False, we plot the absorbance in the y-axis.

B. Concentration is plotted on the x-axis.

True, we vary the concentration and read the absorbance so the plot is Absorbance vs Concentration.

C. The x- and y-axes should be labeled with units as well as quantities

This is true for our plot to be useful and correct.

D. Concentration is plotted on the y-axis

False, for all the reasons stated above.

E. In a hand-plotted graph, individual lines should be drawn between adjacent points

False, in a hand plotted graph we will pass the line between all the points determined as close as to produce the best line where we can read values for the absorbance for a given concentration.

F. Absorbance is plotted on the y-axis

True

G. The command for getting an equation is "Add Trendline" in Microsoft Excel.

False, the command adds only the line of the best fit to our data, to get the equation of the line we have to specify it by choosing it in the options for the format of trendline.

6 0

3 years ago

Which have the most gravitational potential energy?

Free_Kalibri [48]

I believe D because since it is up so high when the lady begins to fall she will have a greater force bringing her back to her original starting point

4 0

3 years ago

Magnesium oxide does not readily decompose into magnesium and oxygen. The reaction is shown below. MgO(s) + 601.7 kJ mc017-1.jpg

galben [10]

TEMPERATURE IS THE ANSWER

5 0

3 years ago

Read 2 more answers

What molarity is prepared when a solution contains 0.277 moles of calcium bromide in 500 mL of solution (must change mL to Liter

Vladimir79 [104]

Answer:

0.554M of Calcium Bromide

Explanation:

Molarity by defintion is #of moles of something/litres of solution.

Therefore, here, we have 0.277 moles of calcium bromide and 500mL (divide 500ml by 1000 to go from mL to L because for every 1L there's 1000mL) or 0.5L.

Molarity= 0.277/0.5 = 0.554M of Calcium Bromide

5 0

3 years ago