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Delvig [45]
3 years ago
15

Select the statement about mixtures that is correct. Select one: a. Suspensions are homogeneous mixtures of two or more componen

ts. b. Solutions contain particles that settle out in time. c. Suspensions can change reversibly from liquid to solid. d. A solution contains solvent in large amounts and solute in smaller quantities.
Chemistry
1 answer:
andreev551 [17]3 years ago
5 0

Answer:option d. A solution contains solvent in large amounts and solute in smaller quantities.

Explanation:

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A student dissolves 0.0688 mol of sodium hydroxide in water to make a 0.250 L solution. What is the molarity of the solution?
den301095 [7]
Number of moles = 0.0688 moles of NaoH

volume = 0.250 L

Molarity = moles of solute / volume ( L )

M = 0.0688 / 0.250

M = 0.28 M

Answer B
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3 years ago
What is the half life of this element?<br> A. 80 days B. 40 days C. 5 days D. 10 days
masha68 [24]

Answer:

c. 5days

Explanation:

there is no question but if it's a graph

the answer is 5days

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3 years ago
The dashed line in the represent?
Alchen [17]

Answer:

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Explanation:

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8 0
3 years ago
Which of the following would have the largest pKa?
garri49 [273]

Answer:

CH3CH2NH3+/CH3CH2NH2 would have the largest pKa

Explanation:

To answer this question we must know Kb of CH3CH2NH2 is 5.6x10⁻⁴, and for C6H5NH2 is 4.0x10⁻¹⁰. And the CH3CH2NH3+ and C6H5NH3+ are related with these substances because are their conjugate base. That means:

pKa of  CH3CH2NH3+ =  CH3CH2NH2;  C6H5NH3+ =  C6H5NH2

Also, Kw / Kb = Ka

Thus:

pKa of CH3CH2NH3+/CH3CH2NH2 is:

Kw / kb = Ka = 1.79x10⁻¹¹

-log Ka = pKa

pKa = 10.75

pKa of C6H5NH3+/ C6H5NH2 is:

Kw / kb = Ka = 2.5x10⁻⁵

-log Ka = pKa

pKa = 4.6

That means CH3CH2NH3+/CH3CH2NH2 would have the largest pKa

5 0
3 years ago
Which period does this atom belong to?
GrogVix [38]
I think it’s to long to fit in a period??
7 0
3 years ago
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