The formatting of the question is a bit scrambled: I'm not sure if there are separate steps that have been unintentionally consolidated into a seemingly discrete step, nor am I sure which letters actually correspond with which step(s). So, for clarity's sake, I treated every sentence as its own step and arranged all of them accordingly. Hopefully, you can then reorganize them according to the labeled steps as you have been provided.
Suspend a separatory funnel using an iron ring and ring stand. Make sure the stopcock is closed. Transfer the organic (dichloromethane) layer to the funnel. Add an equivalent volume of aqueous acid to the dichloromethane layer in the separatory funnel. Cap the separatory funnel with a glass or Teflon stopper. Remove the funnel from the iron ring and shake vigorously to mix the layers, periodically venting to release pressure. Place the separatory funnel back in the Iron ring. Allow the layers to physically separate in the funnel. Remove the cap.Drain the bottom layer into a labeled beaker. Label the beaker "Organic Layer". Drain the remaining liquid into a labeled beaker. Label this beaker "Aqueous Layer". Transfer the "Organic Layer" back to the empty separatory funnel. Repeat all steps.Notes:
The letters have been replaced with numbers only to clarify the order of the steps. No changes were made to the steps themselves, including any stylistic errors.A very few set of sequential steps might be interchangeable, but the steps as separated and organized above is in accordance with standard liquid-liquid extraction protocol.Determining which layers are the "organic" and "aqueous" layers (i.e., whether the organic/aqueous layer, or vice-versa, is on the bottom/top ) is a nontrivial step; for this reason, when actually doing such extractions, the beakers (or whatever vessel) into which the layers are drained at any step are sometimes labeled "top layer" and "bottom layer" in case you misidentify which layers are, in fact, the organic and aqueous layers. Oftentimes, the organic layer is on top of the aqueous layer as many common organic solvents are less dense than water. Halogenated organic solvents, like dichloromethane, are one of the exceptions, and so will generally comprise the bottom layer.U
Question 13
4 pts
Using the formula Na + Cl2 --> NaCl, if 3.93 moles of chlorine are combined
with excess* sodium, how many moles of sodium chloride will be made? Note
that in this question, excess means extra or as much as you need.
Answer:
7.86 moles of sodium chloride are produced.
Explanation:
Given data:
Moles of chlorine = 3.93 mol
Amount of sodium = excess
Moles of sodium chloride formed = ?
Solution:
Chemical equation:
2Na + Cl₂ → 2NaCl
Now we will compare the moles of sodium chloride with chlorine.
Cl₂ : NaCl
1 : 2
3.93 : 2×3.93 = 7.86
Chlorine is limiting reactant that's why we compare the NaCl with only number of mole of chlorine.
Thus, 7.86 moles of sodium chloride are produced.
Use the solubility rules from the Lab 4 introduction and your knowledge of qualitative separation schemes from the lab to answer the following questions.
The qualitative analysis experiment you did is actually an abbreviated version of a much larger analysis scheme in which many different cations are separated and identified. Suppose a mixture contains Ag+, K+, NH4+, Hg22+, Pb2+, Mg2+, Sr2+, Ba2+, Cu2+, Al3+ and Fe3+.
(a) Which of the following ions could you separate, by causing them to precipitate, with the addition of HCl? (Hint: HCl is a source of chloride ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(b) After the addition of HCl, the above sample is centrifuged and decanted. Which of the following cations remaining in the supernatant could you separate, by causing them to precipitate, with the addition of H2SO4? (Hint: H2SO4 is a source of sulfate ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(c) After the addition of H2SO4, the above sample is centrifuged and decanted. Which of the following cations remaining in the supernatant could you separate, by causing them to precipitate, with the addition of H2CO3? (Hint: H2CO3 is a source of HCO3− and carbonate ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(d) Choose one of the cations above and write the net precipitation reaction that occurs. (Use the lowest possible coefficients. Include states-of-matter under the given conditions in your answer.)
Cu2+(aq) + (CO3)2-(aq) → CuCO3(s)
Your answer contains an improperly or incompletely formatted chemical formula. Your answer contains improper superscript or subscript
Answer:
Explanation:
a ) silver chloride AgCl and lead chloride PbCl₂ Hg₂Cl₂ , are not dissolved in ware
so Ag⁺ and Pb⁺² Hg₂ ⁺² will precipitate out .
b ) BaSO₄ , SrSO₄ are insoluble
Ba⁺² and Sr⁺² will precipitate out .
c )
Al₂( CO₃)₃ , Fe₂(CO₃)₃ , CuCO₃ insoluble .
Al⁺³ and Fe⁺³ and Cu⁺² will be insoluble .
d )
2Fe⁺³(aq) + 3CO₃⁻²(aq) = Fe₂(CO₃)₃ (s)
Determine a piece of copper with a volume of 100 cm power 3 has a mass of 890 g. Explain how you could use this information to find out how much mass would be in 13 cm power 3 of copper
Explain the difference between the organism, population, and community levels of ecological organization
Answer:
A population is a group of organisms belonging to the same species that live in the same area and interact with one another.
Explanation:
Levels of Ecological Organization
Level # 2. Population:
Level # 3. Community:
Level # 4. Ecosystem:
Level # 5. Biome:
Level # 6. Biosphere:
What is the definition of the word: Property (the scientific definition A makes up matter; makes up the world around us B an object or diagram C something that can be observed about a substance D to change the position of something HEalPPPPPPpPP
Answer:
i feel like the answer is A
ARE MINERALS man-made?
Answer:
no
their made from the earth
What is the most likely reason a computer model is used for a black hole?
Answer:
Black holes are merely the most exotic example of the general principle that ... quantum computer stores bits on protons and uses magnetic fields to flip them. ... Powered by Standard Model software, the universe computes
Explanation:because they are mostly exotic
Eukaryotes share which characteristic with prokaryotes?
•lysosomes
•vacuole
•mitochondria
•cell membrane
Answer:
cell membrane is the answer
Answer: cell membrane
Explanation:
What happens when water turn’s into gas
Answer:
The process of turning water into gas is called evaporation. When water is heated, it changes state from a liquid to a solid. No mass is destroyed during the process, but rather, it is converted into gas.
Explanation:
Brainliest Plzzz!!!
15) What is the hydronium ion concentration [H3O + ] of a 0.125 M hydrocyanic acid solution with Ka = 4.9 × 10-10? The equation for the dissociation of hydrocyanic acid is: HCN(aq) + H2O(l) ⇌ H3O+(aq) + CN- (aq)
The hydronium ion concentration [H₃O⁺]=7.826 x 10⁻⁶
Further explanationIn general, the weak acid ionization reaction
HA (aq) ---> H⁺ (aq) + A⁻ (aq)
Ka's value
[tex]\large {\boxed {\bold {Ka \: = \: \frac {[H ^ +] [A ^ -]} {[HA]}}}}[/tex]
Reaction
HCN(aq) + H₂O(l) ⇌ H₃O⁺(aq) + CN⁻ (aq)
0.125
x x x
0.125-x x x
[tex]\tt Ka=\dfrac{[H_3O^+][CN^-]}{[HCN^-]}[/tex]
[tex]\tt 4.9\times 10^{-10}=\dfrac{x^2}{0.125-x}\approx \dfrac{x^2}{0.125}\\\\x^2=6.125\times 10^{-11}\\\\x=7.826\times 10^{-6}[/tex]
can someone please help me
which factor is unable to determine the climate of an area
Answer:
The climate of any particular place is influenced by a host of interacting factors. These include latitude, elevation, nearby water, ocean currents, topography, vegetation, and prevailing winds.
Explanation:
those are what does not affect climate
Which characteristic BEST identifies a pure substance?
a. shape
b. texture
c. melting point
d. state of matter
Whoever helps I will give BRAINLIEST
30 points!! please help chem question
the state of y at room temperature is gas, good luck!
The volume of an ideally behaving gas is 300 L at 227°C. What volume will the gas occupy at 27°C when pressure remains constant?
Answer:
[tex]V_2=35.68\ L[/tex]
Explanation:
Initial volume, V₁ = 300 L
Temperature, T₁ = 227°C
New temperature, T₂ = 27°C
We need to find the volume of gas occupied when the temperature is 27°C.
It is based on Charle's law. A/c to Charle's law,
[tex]V\propto T[/tex] (at constant pressure)
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\\\\V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{300\times 27}{227}\\\\V_2=35.68\ L[/tex]
Hence, the new volume is 35.68 L.
Stomach acid is predominately hydrochloric acid. Write the balanced chemical equation for the neutralization reaction between HCI and the active ingredient.
Express your answer as a chemical equation. Identify all of the phases in your answer
Answer:
HCl + Mg(OH2) ---> MgCl2 + H2O
Explanation:
hydrochloric acid + magnesium hydroxides ==> magnesium Chloride (a salt) + Water
HCl + Mg(OH2) ---> MgCl2 + H2O
Please help, I will give brainliest
What two particles are found in the nucleus of an atom?
Answer: it has one proton and electron
Explanation:
Earth is a single interconnected system. True False
Answer:
True
Explanation:
Earth is a single interconnected system but it can be subdivided into smaller systems.
What is one way the lack of gravity in space affects the human body?
Please help ASAP
Answer:
Loss of muscle mass because there is no weight on the back and legs.
Explanation:
How many moles of hydrogen atoms are there in 1.25 x 1025 molecules of ethane? (C2H6)
Answer:
124.56 moles of Hydrogen atoms.
Explanation:
We'll begin by calculating the number of moles of ethane that contains 1.25×10²⁵ molecules. This can be obtained as follow:
From Avogadro's hypothesis, 1 mole of any substance contains 6.02x10²³ molecules. This implies that 1 mole of ethane also contains 6.02x10²³ molecules.
Thus, 6.02x10²³ molecules are present in 1 mole of ethane.
Therefore, 1.25×10²⁵ molecules are present in = 1.25×10²⁵/6.02x10²³ = 20.76
Therefore, 20.76 moles of ethane contains 1.25×10²⁵ molecules.
Finally, we shall determine the number of mole of Hydrogen in 20.76 moles of ethane. This can be obtained as follow:
Ethane has formula as C2H6.
From the formula, 1 mole of ethane, C2H6 contains 6 moles of Hydrogen atoms.
Therefore, 20.76 moles of ethane will contain = 20.76 × 6 = 124.56 moles of Hydrogen atoms.
Therefore, 1.25×10²⁵ molecules of ethane contains 124.56 moles of Hydrogen atoms.
HELPPPP . what is this
I'll be honest I'm guessing,
but maybe D
Which statement about Earth's core helps explain Earth's magnetic field?
-Earth's core is composed of magnets.
-Earth's core is composed of iron and nickel.
-The outer core is solid,
-The inner core is liquid and moving
Answer:
it should be B. earths core is composed of iron and nickel, if not let me know.
Answer: B. Earth's core is composed of iron and nickel.
Explanation: The inner core is solid so C and D are incorrect and A is incorrect because the core isn't made of magnets so it has to be B.
Calculate the minimum volume of oxygen
that is required for the complete combustion
of a mixture of 20cm3 of CO and 25cm3 of
hydrogen.
A. 45 cm3
B. 22.5cm3
C. 20 cm3
D. 10 cm3
if you know any answer to this pls help out I'll give brainiest plus a lot of points
Answer:
I cant see it clearly
Explanation:
:(
PLEASE HELP!!
The scientific method is a process that scientists use to investigate something in the natural world. Which of these best describes the difference between a scientist collecting data and analyzing data?
A -When a scientist collects data the hypothesis is compared to the data. When a scientist analyzes data, data are analyzed, scientists predict future experiments.
B - When a scientist collects data, the scientist develops new ideas for experiments. When a scientist analyzes the data, he or she looks at what could be improved in the investigation.
C - When a scientist collects data, the data include the observations made during the experiment. When a scientist analyzes the data, the scientist communicates his observations to other scientists.
D - When a scientist collects data, he or she record the data from an experiment. When a scientist analyzes the data, he or she decides whether or not the data support the hypothesis.
Answer:
I believe D is the best answer choice.
Explanation:
C is also a good answer but I feel like D most accurately describes the scientific method.
Answer:
C
Explanation:
its true and contains more academic words and i got it right
A compound has the following composition by mass:
32% carbon, 6.7% hydrogen, 42.6% oxygen and 18.7% nitrogen
What is the empirical formula of the compound?
Answer:
i cry when im alone
Explanation:
Which of the following is an example of a reaction that you've seen in your everyday life?
Question 5 options:
Ice melting
Salt dissolving
Water freezing
Fire burning
Answer:
water freezing
Explanation:
i think so
SOMEONE ANSWER NOW
Which statement best explains why light can travel with or without a medium?
A medium is necessary for light waves to travel.
Light waves cannot travel in a vacuum.
Light waves are longitudinal waves that do not require a medium to travel.
Transverse waves do not require a medium to travel.
Explanation:
its light waves cannot travel through vaccum
hope it helps
Answer:
Transverse waves do not require a medium to travel.
Explanation:
The forces that hold atoms together in an element determine its
F. conductivity
G.melting temperature only
H.hardness only
J.melting temperature and hardness
