The Protective Equipment is a Face Shield.
Hydrochloric acid is a dangerous chemical, it can be handled with proper care. As we know Hydrochloric acid is corrosive. If acid touches the skin, eyes, and internal organs then the damage can not be treated, or even in some cases it is fatal.
If hydrochloric acid is used in the workplace, then there is a need for access to an eye-flush station.
If acid is used at home, then need to follow some safety instructions. If acid is diluted with water, still there is a need for protection. For example: wear protective clothes and gloves.
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The mass percentage of pencils in a collection of keys that weigh
132.456 g and a pencil that weighs 9.540 g is
%?
Answer:
Mass Percent of Pencils = 7.20%
Explanation:
The mass percent can be calculated using the following equation. In this case, the "solute" is the pencil and the "solution" is the collection of pencils.
mass solute
Mass Percent = ------------------------ x 100%
mass solution
9.540 g (pencil)
Mass Percent = -------------------------------------------- x 100%
132.456 g (pencil collection)
Mass Percent = 7.20%
A 684.6 mL sample of carbon dioxide was heated to 387 K. If the volume of the carbon dioxide sample at 387 K is 933.9 mL, what was its temperature at 684.6 mL
According to Charle's law equation, the volume of a sample of carbon dioxide will be 684.6 mL and the temperature will be 283.60 K.
Charle's law equationAccording to Charles' Law, the volume of a gas container with a certain amount of gas within is precisely proportional to the temperature when the pressure is constant.
Calculation:[tex]V_{1}[/tex] = 684.6 mL
[tex]V_{2}[/tex] = 933.9 mL
[tex]T_{1}[/tex] = ?
[tex]T_{2}[/tex] = 387 K
Using Charle's law equation
[tex]\frac{684.6}{T_{1} } = \frac{933.9}{387}[/tex]
[tex]T_{1} = \frac{2,64,862.8}{933.9}[/tex]
[tex]T_{1} = 283.60 K[/tex]
According to Charle's law equation, the temperature at 684.6 mL volume was 283.60 K.
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What is δs° for the reaction so2(s) no2(g) → so3(g) no(g)? substance s°(j/k • mol) so2(g) 248.5 so3(g) 256.2 no(g) 210.6 no2(g) 240.5
The value of ΔS° for reaction is - 22.2 J/K.mol
[tex]SO_{2}(s)+NO_{2} (g)[/tex] → [tex]SO_{3}(g)+NO(g)[/tex]
Calculation,
Given value of S°(J/K.mol) for
[tex]SO_{2}(s)[/tex] = 248.5
[tex]NO_{2} (g)[/tex] = 240.5
[tex]NO(g)[/tex] = 210.6
[tex]SO_{3}(g)[/tex] = 256.2
Formula used:
ΔS° (Reaction) = ∑S°(Product) - ∑S°(Reactant)
ΔS° = (256.2 + 210.6 ) - ( 248.5 + 240.5) = 466.8 - 489 = - 22.2 J/K.mol
The change in stander entropy of reaction is - 22.2 J/K.mol. The negative sign indicates the that entropy of reaction is decreases when reactant converted into product.
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He nitrogen cycle is one of the most important (and complex!) of the biogeochemical cycles. Why is nitrogen important?
Nitrogen is an essential part of proteins and nucleic acids (DNA).
Why is nitrogen important?All living things require nitrogen. It is a part of proteins, ATP, chlorophyll, DNA, and RNA. Given that it makes up a significant portion of the structures of biomolecules in living organisms, its synthesis and consumption in the biogeochemical cycle are of highest importance. Proteins are made up of amino acids (NH2 group).
The structural development of living species' genetic material (DNA, RNA) also involves nitrogen. It is a part of the nitrogenous bases, which together with other nucleotides create RNA and DNA.
Therefore, a nitrogen deficit can cause major structural issues for such an organism.
What happens if nitrogen cycle is disrupted?A number of undesirable consequences can result from the nitrogen cycle being disrupted. For instance, an abundance of nitrogen in aquatic systems leads to eutrophication. Acid rain can be caused by a rise in atmospheric nitrogen.
The majority of ecosystems can tolerate low nitrogen levels since the majority of nitrogen is not biologically accessible in nature. Ecosystems become out of balance when humans significantly increase the quantity of nitrogen that is accessible through fertilizers, fertilizer use, and other means.
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Use the following, balanced equation for the question below:
2Al(s) + 3CuCl₂(aq) → 3Cu(s) + 2AlCl3(aq)
How many moles of aluminum are needed to produce 50.0 grams of aluminum chloride?
Answer:
0.375 moles Al
Explanation:
To find the moles Al, you need to (1) convert grams AlCl₃ to moles AlCl₃ (via molar mass) and then (2) convert moles AlCl₃ to moles Al (via mole-to-mole ratio from equation coefficients). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value (50.0 g).
Molar Mass (AlCl₃): 26.982 g/mol + 3(35.453 g/mol)
Molar Mass (AlCl₃): 133.341 g/mol
2 Al(s) + 3 CuCl₂(aq) -----> 3 Cu(s) + 2 AlCl₃(aq)
50.0 g AlCl₃ 1 mole 2 moles Al
-------------------- x ------------------ x ----------------------- = 0.375 moles Al
133.341 g 2 moles AlCl₃
The book value of a machine, as shown on the balance sheet, is not relevant in a decision concerning the replacement of that machine by another machine. (Ignore taxes.) Group starts
The book value of a machine, as shown on the balance sheet, is not relevant in a decision concerning the replacement of that machine by another machine: TRUE
What is the book value?Book value is the worth of an asset based on its balance sheet account balance in accounting. The value of an asset is determined by subtracting the asset's original cost from any depreciation, amortization, or impairment expenses. Traditionally, a company's book value is equal to its total assets minus intangible assets and liabilities. In practice, however, depending on the source of the computation, book value may include either goodwill or intangible assets, or both. The value inherent in its employees, which is part of a company's intellectual capital, is always overlooked. When intangible assets and goodwill are specifically omitted, the indicator is frequently defined as "tangible book value."Therefore, the statement "the book value of a machine, as shown on the balance sheet, is not relevant in a decision concerning the replacement of that machine by another machine" is TRUE.
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Complete question:
The book value of a machine, as shown on the balance sheet, is not relevant in a decision concerning the replacement of that machine by another machine. (Ignore taxes.) TRUE or FALSE
one model that shows how energy passes from organism to organism is called? 1. an energy link 2. a food chain 3. a phytoplankton cycle
A sample of air at room temperature in a 4.00 L container holds approximately 0.562 moles of O2and 2.11 moles of N2 along with other trace elements to total 2.67 moles. What is the mole fraction of N2 in the mixture
Taking into account the definition of mole or molar fraction, the mole fraction of N₂ in the mixture is 0.79.
Molar fractionThe molar fraction is used to express the concentration of a solute in a solution and expresses the proportion in which a substance is found with respect to the total moles of the solution, which are calculated by adding the moles of solute(s) and solvent.
The mole fraction "x" of the elements in a compound is defined as a ratio between the number of moles of each of the different elements present in the compound and the total number of moles of them:
x=number of moles of the solute÷ total number of moles
Mole fraction of N₂ in the mixtureIn this case, you know that:
number of moles of N₂: 2.11 molestotal number of moles: 2.67 molesReplacing in the definition of mole fraction:
x=2.11 moles÷ 2.67 moles
Solving:
x= 0.79
Finally, the mole fraction of N₂ in the mixture is 0.79.
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A compound has an empirical formula of CH₂O. What is its molecular formula, if its molecular mass is 90 g/mol?
(C=12.01 amu, H=1.008 amu, O=16.00 amu)
A: C3H6O3
B: C9H1809
i need help asap, will give brainliest and 50 points, as this is on my final :)
Empirical formula mass
[tex]\\ \tt{:}\dashrightarrow 12+2+16[/tex]
[tex]\\ \tt{:}\dashrightarrow 30g/mol[/tex]
n:-
[tex]\\ \tt{:}\dashrightarrow \dfrac{Molecular\:mass}{Empirical\:mass}[/tex]
[tex]\\ \tt{:}\dashrightarrow \dfrac{90}{30}[/tex]
[tex]\\ \tt{:}\dashrightarrow 3[/tex]
Molecular formula
[tex]\\ \tt{:}\dashrightarrow n\times Empirical\: formula [/tex]
[tex]\\ \tt{:}\dashrightarrow 3(CH_2O)[/tex]
[tex]\\ \tt{:}\dashrightarrow C_3H_6O_3[/tex]
Please help me i really need it!
The average atomic mass of sulfur = 32.33 u
What is the average atomic mass of sulfur?The average atomic mass of sulfur is determined as follows:
Average atomic mass = (31.977 × 0.818) + (32.97 × 0.008) + (33.97 × 0.174)
Average atomic mass = 32.33
In conclusion, the average atomic mass of sulfur is determined from the sum of the isotopic masses and their relative abundance.
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N analyst prepared a sucrose solution by weighing 1kg of water and add 1.5kg sucrose.estimate the concentration of the resultant solution in (i) mass percent (ii) degree brix
The concentration of the solution in mass percent is 60%.
What is the mass percent?The concentration of a substance can be expressed in mass percent. This refers to the percentage of the solute that is contained in the solution.
Thus we can write;
Mass percent = Mass of solute/ Mass of solution * 100/1
Mass percent = 1.5kg/1.5kg + 1 Kg * 100/1
Mass percent = 60%
Hence, the concentration of the solution in mass percent is 60%.
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Which equation agrees with the ideal gas law?
StartFraction V subscript 1 over T subscript 1 EndFraction equals StartFraction V subscript 2 over T subscript 2 EndFraction.
V subscript 1 n subscript 1 equals V subscript 2 n subscript 2.
P subscript 1 n subscript 1 equals P subscript 2 n subscript 2.
StartFraction P subscript 1 over P subscript 2 EndFraction equals StartFraction T subscript 2 over T subscript 1.
The equation for ideal gas law is written as PV = nRT.
What is Ideal gas law?Ideal gas law states that, the volume of a given amount of gas is directly proportional to the number on moles of gas, directly proportional to the temperature and inversely proportional to the pressure.
PV = nRT
where;
P is pressure of the gasV is volume of the gasn is number of molesR is ideal gas constantT is temperatureThus, the equation for ideal gas law is written as PV = nRT.
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Answer:
A edg
Explanation:
A weather balloon calibrated at 0.00 °c to have a volume of 12.0 l has what volume at -22.8 °c assuming pressure is held constant?
Considering the Charles's law, the volume at 22.8 °C is 10.9978 L.
Charles's lawCharles's law establishes the relationship between the temperature and the volume of a gas when the pressure is constant.
Charles's law says that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases, and as the temperature decreases, the volume of the gas decreases. That is, the volume is directly proportional to the temperature of the gas.
Mathematically, Charles' law is a law that says that when the amount of gas and pressure remain constant, the ratio between volume and temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Considering an initial state 1 and a final state 2, it is fulfilled:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
Volume at -22.8 °CIn this case, you know that:
V1= 12 LT1= 0 °C= 273 KV2= ?T2= -22.8 °C= 250.2 KReplacing in Charles's law:
[tex]\frac{12 L}{273 K} =\frac{V2}{250.2 K}[/tex]
Solving:
V2= [tex]250.2 K x\frac{12 L}{273 K}[/tex]
V2= 10.9978 L
Finally, the volume at 22.8 °C is 10.9978 L.
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What part of the autonomic
nervous system calms you down
after an exciting event?
A. Somatic
B. Temporal lobe
C. Parasympathetic
Answer:
C. Parasympathetic
Explanation:
Menthol, the substance we can smell in mentholated cough drops, is composed of C, H, and O. A 0.1005g sample of menthol is combusted, producing 0.2829g of CO2 and 0.1159g of H2O.
What is the empirical formula of menthol?
If the compound has a molar mass of 156 g/mol, what is its molecular formula?
The Empirical formula of compound is C₁₀H₂₀O₁. The Molecular Formula of compound is C₁₀H₂₀O₁.
What is Empirical Formula ?Empirical formula is the simplest whole number ratio of atoms present in given compound.
[tex]\text{Mass of C} = 0.2829\ g\ CO_2 \times \frac{12\ g\ C}{44\ g\ CO_2}[/tex]
= 0.07720 g C
[tex]\text{Mass of H} = 0.1159\ g\ H_2O \times \frac{2\ g\ H}{18\ g\ H_2O}[/tex]
= 0.01297 g H
Mass of O = Mass of methanol - mass of C - mass of O
= 0.1005 g - 0.07720 g - 0.01297 g
= 0.01033 g
Element Mass/g Moles Ratio Integers
C 0.07720 0.006428 9.956 10
H 0.01297 0.01287 19.93 20
O 0.01033 0.0006456 1 1
The Empirical formula of compound is C₁₀H₂₀O₁.
How to find the Molecular formula of compound ?Molecular formula = Empirical formula × n
[tex]n = \frac{\text{Molar Mass}}{\text{Empirical formula weight}}[/tex]
[tex]= \frac{156}{156}[/tex]
= 1
Molecular formula = n × Empirical formula
= 1 (C₁₀H₂₀O₁)
= C₁₀H₂₀O₁
Thus from the above conclusion we can say that The Empirical formula of compound is C₁₀H₂₀O₁. The Molecular Formula of compound is C₁₀H₂₀O₁.
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The combining power of an element is called ?
A. coefficient
B.subscript
C.periodicity
D.valence number
Answer:
D
Explanation:
Valency is the combining power of an element
How many molecules of H₂O are
equivalent to 97.2 g H₂O?
(H = 1.008 g/mol, O = 16.00 g/mol)
[?]
[?]x10 molecules
Enter your answer with the correct number of
significant figures and be sure the prefix is a number
between 1 and 10!
dro's Number = 6.02 x 1023 molecules/mole
Answer:
3.25 x 10²⁴ molecules H₂O
Explanation:
To find the number of H₂O molecules, you need to (1) convert grams to moles (via molar mass) and then (2) convert moles to molecules (via Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the amount of sig figs in the given value.
Atomic Mass (H): 1.008 g/mol
Atomic Mass (O): 16.00 g/mol
Molar Mass (H₂O): 2(1.008 g/mol) + 16.00 g/mol
Molar Mass (H₂O): 18.016 g/mol
Avogadro's Number:
6.02 x 10²³ molecules = 1 mole
97.2 g H₂O 1 mole 6.02 x 10²³ molecules
------------------ x ------------------- x ------------------------------------ =
18.016 g 1 mole
= 3.25 x 10²⁴ molecules H₂O
what discovery was found by Nels Bohr model of atom ?
Answer:
What was Niels Bohr's most important discovery? Niels Bohr proposed a model of the atom in which the electron was able to occupy only certain orbits around the nucleus. This atomic model was the first to use quantum theory, in that the electrons were limited to specific orbits around the nucleus.
Explanation:
Subjects Of Study: atomic model
Sulfur has an oxidation number of +6 in which two formulas?
A. SO₂ and SO4²-
B. H₂SO4 and SO₂
C. SO3 and SO4²-
D. HSO4- and S₂03²-
[tex] \sf \blue{B. H_{2}SO4 \: and \: SO_{2}}[/tex]
Explanation:As we know in oxidation, oxygen is added and hydrogen is reduced. And in option B, we can observe that is oxygen added +6. So, we conclude that option B is valid.
Hope it help youWhich battery terminal should be connected to the anode and what reaction will occur at the anode?
A) The negative terminal of the battery. Cu2+(aq) + 2e- → Cu(s)
B) The positive terminal of the battery. Cu2+(aq) + 2e- → Cu(s)
C) The negative terminal of the battery. Cu(s) → Cu2+(aq) + 2e-
D) The positive terminal of the battery. Cu(s) → Cu2+(aq) + 2e-
E) The negative terminal of the battery where the brass will be oxidized.
F) The positive terminal of the battery where the brass will be oxidized.
The positive terminal of the battery should be connected to the anode .and Cu(s) → [tex]Cu^{+2} (aq)[/tex] + [tex]2e^{-}[/tex] reaction will occur at the anode.
In electrolysis, the two wires or plates dipping into the electrolytic solution is called electrodes.
The battery is galvanic cell which produce electric current. An electrode connected to positive terminal of the battery is called anode. At anode, oxidation ( loss of electrons) is takes place.
Cu(s) → [tex]Cu^{+2} (aq)[/tex] + [tex]2e^{-}[/tex]
An electrode connected to negative terminal of the battery is called cathode. At cathode, reduction ( gain of electrons) is takes place.
[tex]Zn^{+2} + 2e^{-}[/tex] → [tex]Zn(s)[/tex]
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How does the appearance of
the protist differ from that of the onion sample?
The appearance of the protist differ from that of the onion sample due to the presence of motile structures.
What is a Protist?This is an eukaryote which could be unicellular or multicellular and examples include protozoa etc.
The major difference between a protist and onion sample is that protists have motile structures such as flagella, cilia etc while plant cells such as onions don't have.
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How many chlorine molecules are in 6.5 moles of chlorine?
Answer:
the number of chlorine molecules in 6.5 moles of chlorine is calculated as follows
by use of Avogadro constant that is 1mole = 6.02 x10^23 molecules
what about 6.5 moles
6.5 x ( 6.02x 10^23)= 3.913 x10^24
What is the purpose of a signal phrase?
6.01 formation of the solar system
Answer: The purpose is to analyze the speed of planets around a central star.
Explanation: using variables
If a reaction occurs, what will be the products of the unbalanced reaction below?Zn(s) + HCl(aq) -->
A. No reaction will occur
B. ZnH(s) + Cl2(g)
C. ZnCl2(s) + H2(g)
D. HZnCl(s)
The products will be [tex]ZnCl_2(s) + H_2(g)[/tex]
Chemical reactionsZn is higher than hydrogen in the reactivity series. Thus, it will be able to displace hydrogen from the acid.
The equation of the reaction becomes: [tex]Zn(s) + HCl(aq) -- > ZnCl_2 (s) + H_2 (g)[/tex]
Hydrogen gas is released as a result. In fact, it is one of the ways of preparing hydrogen gas in the laboratory.
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Predict the mass (in grams) of precipitate that will form if a solution containing 2. 34 g of cesium hydroxide is added to a solution containing a large excess of tiso4?
The mass (in grams) of precipitate is 0.6386 gram.
Calculation,
To find the mass of precipitate, first we have to find the precipitate. So, the chemical reaction when cesium hydroxide react to large excess of [tex]TiSO_{4}[/tex].
Mole of cesium hydroxide = given mass/molar mass = 2.34 gm/ 149.912 g/mol= 0.0156 moles
[tex]2CsOH+TiSO_{4}[/tex]→[tex]Ti(OH)_{2} +Cs_{2} SO_{4}[/tex]
So, mole ratio 2: 1
It means two moles of cesium hydroxide required to form one mole of titanium hydroxide.
To produce 0.0156 moles of cesium hydroxide = 0.0156 moles×1 mole/2
Mole of titanium hydroxide = 0.0078 mole
Mole of titanium hydroxide = given mass/molar mass of titanium hydroxide
Mole of titanium hydroxide = given mass/81.82 g/mol = 0.0078 mole
Mass of titanium hydroxide = 0.0078 mole ×81.88 g/mol = 0.6387 gm
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Phosphorus reacts with oxygen gas to produce solid diphosphorus pentoxide. What type of reaction is represented
It is a combination reaction.
P + O₂ → P₂O₅
What is a combination reaction?Combination reactions are those in which two or more reactants combine to create a single product.
A synthesis reaction is another name for a combination reaction. The overall form of the reaction is as follows:
X + Y → XY
There can be a combination reaction between two elements, two compounds, or a compound and an element.
Examples:
H₂ + Cl₂ → 2HCl
P + O₂ → P₂O₅
C + O₂ → CO₂
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The table shows the amount of radioactive element remaining in a sample over a period of time. radioactive decay rate amount of radioactive sample (grams) time (years) 56.0 0 47.1 400 39.6 800 33.3 1,200 28 1,600 part 1: what is the half-life of the element? explain how you determined this. part 2: how long would it take 312 g of the sample to decay to 9.75 grams? show your work or explain your answer.
1. The half life of the element, given the data from the question is 1600 years
2. The time taken for 312 g of the sample to decay to 9.75 grams is 8000 years
1. How to determine the half life of the elementHalf-life is the time taken for half a material to decay.
To determine the half life of the given element, do the following:
Original amount = 56 gHalf the original amount = 56 / 2 = 28 gTime for 28 g = 1600 yearHalf life of element = 1600 yearsHow to determine the timeWe'll begin by determining the number of half-lives that has elapsed. This can be obtained as follow:
Original amount (N₀) = 312 gAmount remaining (N) = 9.75 gNumber of half-lives (n) =?2ⁿ = N₀ / N
2ⁿ = 312 / 9.75
2ⁿ = 32
2ⁿ = 2⁵
n = 5
Finally, we shall determine the time. This can be obtained as follow:
Half-life (t½) = 1600 yearsNumber of half-lives (n) = 5Time (t) =?t = n × t½
t = 5 × 1600
t = 8000 years
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In a mining community, groups of dead fish appear in a local river every few weeks. These fish kills coincide with incidents of mining waste dumped into the river. Which of the following components is an abiotic factor causing these fish kills?
Human activities
Biodiversity in the river
Water pollution
Overfishing
In a mining community, water pollution kills the fish in local river.
How does mining affect the rivers?Large amounts of water are frequently used in mining, which has the potential to contaminate local groundwater, rivers, streams, and other water sources. A community's ability to grow its own food may be hampered by mining since it consumes grazing or agricultural land and pollutes the soil and the environment.
Metals that leach from the rock also contaminate nearby water sources when they do so. chemical processing pollution: When minerals are extracted from their ores using cyanide or sulfuric acid and water, the runoff pollutes the rivers in the area.
Through erosion and sedimentation, dewatering of wetlands, diverting and channelizing streams, and poisoning surface water and aquifers with harmful chemicals, surface mining can have an impact on fish and aquatic resources.
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Answer:
a
Explanation:
A solution with a pH = 13 has approximately how many moles of OH– ions per liter?
Answer:
1 × 10-¹ moldm-³
Explanation:
Pkw = PH + POH
14 = 13 + POH
POH = 1
so , [OH-] = 1 × 10-¹ moldm-³
What is one off the differences in how the leading and lagging strands of dna molecules synthesize?
The basis of the difference between the leading and lagging strand is that DNA polymerase can join new nucleotides only to the 3' end of the growing strand.
The leading strand is the new DNA strand that continually extends from 5' to 3'. On the lagging strand, Okazaki fragments develop and are linked by DNA ligase activity. DNA polymerase can only attach new nucleotides to the 3' end of the developing strand, which forms the basis of the distinction between the leading and lagging strands.
Therefore, "DNA polymerase can link additional nucleotides exclusively to the 3' end of the developing strand" is the appropriate response.
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