Determinar la molaridad de una solución que contiene 60 g. de NaOH en 500 ml. de solución
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In: Chemistry
what distills first in the 3 types of chromatography? Like do polar or non polar molecules go through first in Simple, fractional, and gas chromatography and what type of solvents (polar or nonpolar) are best for each type of chromatography? thanks
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Ammonia is produced industrially from the reaction of hydrogen with nitrogen under pressure in a sealed reactor. What is the percent decrease in pressure of a sealed reaction vessel during the reaction between 3.60 x 10^3 moles of H2 and 1.20 x 10^3 moles of N2 if half of the N2 is consumed? The correct answer is 25%.
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Burning sulfur-containing coal results in the redox reactions below:
HgS + O2 ----> Hg + SO2
Hg + O2 ----> HgO
Explain why burning coal may involve redox reaction?
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The data below was obtained for titration of 25.00mL of a weak acid with 0.150 M KOH. What volume of the KOH solution is required to reach the stoichiometric point? Answer: __ __ . __ mL
VKOH added (mL) pH
0.00 1.96
2.00 2.22
4.00 2.46
7.00 2.77
10.00 3.06
12.00 3.29
14.00 3.60
16.00 4.26
17.00 11.08
18.00 11.67
20.00 12.05
25.00 12.40
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What are differences in effects for a chemical and physical interference in an atomic emission spectrometry? (Explain??)
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Which of these polymers is NOT formed by a condensation reaction? Explain why.
A. polyester
B. polyethylene
C. nylon
D. polyamide
E. All of the above are formed by a condensation reaction.
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A biochemical engineer isolates a bacterial gene fragment and dissolves a 17.0 mg sample of the material in enough water to make 38.9 mL of solution. The osmotic pressure of the solution is 0.340 torr at 25
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In: Chemistry
13. A 15.0 mL NaOH solution is required to neutralize 10.0 mL of 0.100 M H2SO4(aq) solution.
What is the concentration of NaOH solution used?
2NaOH (aq) + H2SO4(aq) → Na2SO4(aq) + 2H2O(l)
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Answer the reason why the cellulose is resistance to chemical attack. ( i.e. chemical structure bonding and so on )
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the Log P value is 4.51 explain briefly how this value is determined and give an example of its significance related to the environmental behavior of the chemical?
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3. What drug groups are in LCMSMS method? Why is it important to analyze these drug groups in urines form patients of a pain management clinic?
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