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Answers.com > Wiki Answers > Categories > Science > Chemistry > What is the name of the compound whose formula is PbSO4?What is the name of the compound whose formula is PbSO4?First answer by ID1289804308.Last edit by Cokoro82.Contributor trust: 0 [recommend contributor recommended].Question popularity: 1 [recommend question].

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Answers.com > Wiki Answers > Categories > Science > Chemistry > Is PbSO4 a solid or an aqueous solution?
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Is PbSO4 a solid or an aqueous solution?PbSO4 is a solid that will not dissolve in water.
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First answer by Stormish.Last edit by Stormish.Contributor trust: 531 [recommend contributor recommended].
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Question popularity: 1 [recommend question].

Can you answer these Chemistry questions?What physical state of nitrogen has the highest entropy?GDC bishop r a vernon.
Why does water behave in an unusual fashion?Who discovered the water molecule?
Why is HI a stronger acid than HCl?What is the product of Sodium Hydroxide?
Is ClNH4 a solid or aqueous solution?It is a solid.it's a salt, called ammonium chloride: NH4Cl What do you get when you add solid to a aqueous solution?
That depends on what solid you add and what the solution is of.
Adding more of the same salt to a solution will just increase the concentration, unless it is saturated.
Adding a different salt will...When something is dissolving is it a solid or an aqueous solution?
When a solid such as table salt is placed in a liquid that dissolves it (a solvent) such as water, it dissolves and passes into solution.
When it is all dissolved there is no solid left, only the...
Is copperII oxide an solid or an aqueous solution?It is a dark grey solid.
Is a solid solid solution an acid?No.A solid-solid solution is called an alloy.
Does a hippo store water longer then a camel?Can you use a tablet PC for graphics designing?
Do people talk french in Greece?What logo have a moon and a people fishing?
Answers.com > Wiki Answers > Categories > Science > Chemistry > What type of reaction is PbSO4 plus Fe?
What type of reaction is PbSO4 plus Fe?FeSO4 + Pb.This reaction can be called "displacement", "single displacement", or "electromotive displacement", and in all of the names previously given, "displacement" could be replaced by "replacement".
First answer by Norvellwisdom.Last edit by Norvellwisdom.
Contributor trust: 118 [recommend contributor recommended].Question popularity: 119 [recommend question].
Can you answer these Chemistry questions?What physical state of nitrogen has the highest entropy?
Why does water behave in an unusual fashion?Who discovered the water molecule?
Why is HI a stronger acid than HCl?What is the product of Sodium Hydroxide?
What type of a reaction is this Fe CuSO4?What is the reaction of Fe plus MgCl2?
What type of reaction is FeS plus 2 HCl FeCl2 plus H2S?What type of reaction is C3H8 plus 5O2?
What type of reaction is Zn plus HCl?How are lions teeth strong enough to get their prey?
Does a hippo store water longer then a camel?Can you use a tablet PC for graphics designing?
Do people talk french in Greece?Molar mass of PbSO4 = 303.
2626 g/mol This compound is also known as Lead(II) Sulfate.
Molecular weight calculation: 207.2 + 32.065 + 15.9994*4 Note that all formulas are case-sensitive.
Did you mean to find the molecular weight of one of these similar formulas?
PBSO4 PbSO4 I'm feeling lucky, show me a random compound.You can also browse the list of common chemical compounds.
In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.
Finding molar mass starts with units of grams per mole (g/mol).
When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance.
The formula weight is simply the weight in atomic mass units of all the atoms in a given formula.
Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction.
These relative weights computed from the chemical equation are sometimes called equation weights.
If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight.
The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.
Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.
A common request on this site is to convert grams to moles.
To complete this calculation, you have to know what substance you are trying to convert.
The reason is that the molar mass of the substance affects the conversion.
This site explains how to find molar mass.The atomic weights used on this site come from NIST, the National Institute of Standards and Technology.
We use the most common isotopes.This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages.
This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes.
For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass.
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0.032 g/100 mL (15 °C) 0.0425 g/100 mL (25 °C) Repr.Cat.1/3 Toxic (T) Harmful (Xn) Dangerous for the environment (N) N?
) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Lead(II) sulfate (British English sulphate) (PbSO4) is a white crystal or powder.
It is also known as fast white, milk white, sulfuric acid lead salt or anglesite.
It is often seen in the plates/electrodes of car batteries, as it is formed when the battery is discharged (when the battery is recharged, then the lead sulfate is transformed back to metallic lead and sulfuric acid on the negative terminal or lead dioxide and sulfuric acid on the positive terminal).
Lead sulfate is poorly soluble in water.Lead(II) sulfate is prepared by treating lead oxide, hydroxide or carbonate with warm sulfuric acid, or by treating a soluble lead salt with sulfuric acid.
Alternatively, it may be created by the interaction of solutions of lead nitrate and sodium sulfate.
Lead sulfate is toxic by inhalation, ingestion and skin contact.It is a cumulative poison, and repeated exposure may lead to anemia, kidney damage, eyesight damage or damage to the central nervous system (especially in children).
Some lead salts may cause reproductive defects and cardiovascular disturbances.
It is also corrosive - contact with the eyes can lead to severe irritation or burns.
Typical threshold limit value (above which the substance is harmful) is 0.
15 mg/m³.The naturally occurring mineral anglesite, PbSO4, occurs as an oxidation product of primary lead sulfide ore, galena.
A number of lead basic sulfates are known: PbSO4·PbO; PbSO4·2PbO; PbSO4·3PbO; PbSO4·4PbO.
They are used in manufacturing of active paste for lead acid batteries.
A related mineral is leadhillite, 2PbCO3·PbSO4·Pb(OH)2.
At high concentration of sulfuric acid (>80%), hydrogen lead sulfate, Pb(HSO4)2, forms.
[3] ^ "CRC Handbook of Chemistry and Physics", 83rd Edition, CRC Press, 2002.
^ a b Zumdahl, Steven S.(2009).Chemical Principles 6th Ed..
Houghton Mifflin Company.p. A22.ISBN 0-618-94690-X.
  ^ Министерство образования и науки РФ, Реферат "Свинец и его свойства", 2007, http://revolution.
allbest.ru/chemistry/00011389_0.html This page was last modified on 16 May 2012 at 03:16.
Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply.
See Terms of use for details.Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc.
, a non-profit organization.Lead sulfate (PbSO4) is created at both the positive and negative electrode plates during a discharge.
In principle, during the charging period, 100% of the lead sulfate transforms to the positive plate (lead dioxide), the negative plate (lead) and sulfuric acid.
However, in real life, when PbSO4 (lead sulfate) is left in the battery for a period of time, it crystallizes and becomes a hard sulfate that coats the surface of the electrode plates.
This phenomenon is called sulfation.Because hard lead sulfate is a non-conductive material, when it coats the electrode plates, it causes a reduction in the area needed for the electro-chemical reactions.
It also reduces the batteries' active materials needed to maintain a high capacity.
Lead sulfate covers surface of electrode plates limiting the area for electro-chemical reaction.
Lead sulfate is also made of useful component materials that are needed for maintaining a high capacity.
Lead sulfate that exists when a battery is not fully charged crystallizes to become a hard lead sulfate when left in a battery for a period of time.
(2~3 days is said to be enough.) In theory, there are three types of lead sulfate.
One is soft lead sulfate that decomposes with a regular charge.
The second is hard lead sulfate that only decomposes during an equalization charge (controlled over-charge done in industrial battery maintenance).
The last is a very hard lead sulfate that fails to decompose even equalization charging.
**Notes to help understand batteries** The worst sulfated battery can be created by just leaving a battery unattended for a long period of time.
A battery is like a bucket with a tiny hole.Electricity leaks little by little through what is called "natural discharge".
It may take three to six months to drain a battery completely, and sulfation created in this process is quite possibly the worst kind.
* For deep cycle batteries used in Renewable Energy, Marine and RV applications, sulfation buildup is a real problem because these batteries are not regularly charged to their full capacity.
Conditioning the battery with Nanopulser makes good sense to maximize the life span of these batteries.
(Nanopulser works on flooded, gel and AGM batteries.) -- IT IS COMMON SENSE TO CONDITION BATTERIES WITH NANOPULSER.
(In general, the average life of a car battery is approximately 48 months.
The average life of a marine cranking battery in recreational marine use is only 22 months.
) * An automobile starter battery is constantly charged while the automobile is running leading one to believe that there might not be a sulfation problem, but in reality, automobile batteries sulfate.
There are many conditions for car batteries to become sulfated.
If a car is not in use and the battery is naturally discharged, the battery sulfates.
Also, in regular starter usage, it takes about 4% of the battery capacity to start a car.
If a car is taken on many short trips requiring the engine to be started many times without getting fully recharged, the battery sulfates.
If a car is equipped with many electrical devices, it is more likely that the battery will sulfate.
Then, when hard lead sulfate crystals form, charging via the alternator would not be sufficient to decompose the hard sulfation crystals completely.
The starter battery begins to loose capacity.Nanopulser will help decompose the hard sulfation crystals so your car battery will last for its maximum life with a constant high capacity.
* In the case of industrial batteries, such as a forklift batteries, where the recommendation is to perform equalization charges* every 4 to 6 cycles, Nanopulser will help ensure the batteries last their maximum possible lifespan.
As a case study, in a warehouse situation, a 12 year old battery was conditioned with Nanopulser and the result was a rise in specific gravity (SG).
It rose from 1.205 to 1.232 SG in 6 weeks.(This battery was a high acid-concentration battery and the SG specification at full charge was 1.
310.The SG specification at full charge for common batteries is 1.
280.Also, when crystallized lead sulfate grows to a large size on the plates, it precipitates from the plates when it is large enough and accumulates at the bottom of the battery case.
When this accumulation touches the plates, it shorts out the battery.
) The treatment with Nanopulser decomposed the hard lead sulfate on the plates that equalization charging could not dissolve.
This 12 year old battery did not recover completely.
We concluded that lead sulfate crystals already precipitated at the bottom of the battery case may not decompose.
However, the increase in SG shows the desulfation effect of the lead sulfate on the plates.
Also, in other cases, 4 ~ 6 year old batteries recovered SG up to 1.
283.The best way to use Nanopulser in material handling is to install it on a brand new battery and avoid hard sulfation buildup from the very beginning even in a situation where batteries are well maintained.
And of course, Nanopulser is highly recommended for those who tend to leave batteries discharged for a period of time**.
---* Equalization charge is a controlled over-charge to equalize the specific gravity among all of the cells.
It is a controlled high-voltage charge lasting for a duration of 5 to 7 hours.During this charge, the battery gases out hydrogen and oxygen and creates heat.
By performing this charge it is possible to damage the battery plates by excessive gassing and heat.
The benefit of an equalization charge is removal of some sulfation buildup and correction the stratification of the acid density by stirring the electrolyte using the rising gas bubbles.
Stirring is necessary to avoid high acid concentrations that can corrode the lower portion of the plate faster than the upper portion where the acid density is lower.
---** In industrial usage batteries the recommendation is to avoid discharging batteries no more than 80% of their capacity and then charging them to 100% immediately after the discharge.
If drained lower than 80%, a quantity of lead sulfate will be created more than desired.
Also, hard lead sulfate will start forming within 2 days if batteries are left discharged.
To avoid sulfation buildup, the battery must be charged back to 100% right after discharge.
Equalization charge should take care of the hard sulfation, but there will be some sulfation left over that the equalization charging misses.
Sulfation is a crystallized lead sulfate (PbSO4) which coats the electrode plates and eventually causes premature battery failure.
♦Sulfated electrode plate (picture on the left) White sulfation (hard lead sulfate, the crystallized PbSO4) is covering the electrode plate.
Lead sulfate is a non-conductive material.Coating an electrode plate with this non-conductive material causes a reduction in the surface area which is needed for the electro-chemical reactions.
Sulfation also causes loss of component materials of the battery.♦Condition of a new electrode plate (picture on the right) The surface of new electrode plate is spongy.
This porous condition increases the surface area for the electro-chemical reaction.
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When an electrode plate is new and not coated by hard lead sulfate buildup, it has more area for electro-chemical reactions and more component materials to produce electricity.
  Boat Electric Co., Inc.The following problems are taken from T.
L.Brown, H.E.Lemay, B.E.Bursten, & J.R.Burdge, Chemistry: The Central Science, Ninth Edition, Chapter 20.
Au(s) + 4Br-(aq)                    E°red = -0.
858 V Eu2+(aq)                                       E°red = -0.
43 V                     IO-(aq) + H2O(l) + 2e- I-(aq) + 2OH-(aq)          E°red = +0.
49 V Sn(s)                                            E°red = -0.
14 V       (a) Write the cell reaction for the combination of these half-cell reactions that leads to the largest positive cell emf, and calculate the value.
      (b) Write the cell reaction for the combination of half-cell reactions that leads to the smallest positive cell emf, and calculate that value.
44) For each of the following reactions, write a balanced equation, calculate the emf, and calculate ΔG° at 298 K.
          (a) Aqueous iodide ion is oxidized to I2(s) by Hg22+(aq).
            (b) In acidic solution, copper(I) ion is oxidized to copper(II) ion by nitrate ion.
      (c) In basic solution, Cr(OH)3(s) is oxidized to CrO42-(aq) by ClO-(aq).
      (a) If the concentration of Sn2+ in the cathode compartment is 1.
00 M and the cell generates an emf of +0.22 V, what is the concentration of Pb2+ in the anode compartment?
      (b) If the anode compartment contains [SO42-] = 1.
00 M in equilibrium with PbSO4(s), what is the Ksp of PbSO4?80) Metallic magnesium can be made by the electrolysis of molten MgCl2.
      (a) What mass of Mg is formed by passing a current of 5.
25 A through molten MgCl2 for 2.50 days?      (b) How many minutes are needed to plate out 10.
00 g Mg from molten MgCl2 using 3.50 A current?      The cell is operated at 298 K with [Cu+] = 2.
5 M and [I -] = 3.5 M.      (a) Determine E for the cell at these concentrations.
          (b) Which electrode is the anode of the cell?
      (c) Is the answer to part (b) the same as it would be if the cell were operated under standard conditions?
      (d) If [Cu+] were equal to 1.
4 M, at what concentration of I - would the cell have zero potential?
The Medical College Admission Test (MCAT), administered 25 times per year by the Association of American Medical Colleges, is the examination required by almost all accredited medical school programs in the United States and Canada.
The MCAT tests understanding of physical and biological sciences, as well as verbal reasoning and writing skills.
Once a paper-based exam, the MCAT is now administered only in a computer format; the questions remain the same.
All but two essay portions of the MCAT are scored on a 1–15 point scale.The lowest score possible is 3, and the highest score possible is 45.
Most competitive programs require a combined MCAT score of 30 for consideration.
The following are actual questions taken from previously administered MCAT exams.
Verbal Reasoning Read the passage carefully and choose the best answer to each question.
The questions are to be answered on the basis of what is stated or implied in the passage.
But man is not destined to vanish.He can be killed, but he cannot be destroyed, because his soul is deathless and his spirit is irrepressible.
Therefore, though the situation seems dark in the context of the confrontation between the superpowers, the silver lining is provided by the amazing phenomenon that the very nations which have spent incalculable resources and energy for the production of deadly weapons are desperately trying to find out how they might never be used.
They threaten each other, intimidate each other, and go to the brink, but before the total hour arrives they withdraw from the brink.
1.The main point from the author's view is that Man's soul and spirit cannot be destroyed by superpowers.
Man's destiny is not fully clear or visible.Man's soul and spirit are immortal.
Man's safety is assured by the delicate balance of power in terms of nuclear weapons.
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Human society will survive despite the serious threat of total annihilation.2.The phrase 'Go to the brink' in the passage means Declare war on each other.Advancing to the stage of war but not engaging in it.3.In the author's opinion Huge stockpiles of destructive weapons have so far saved mankind from a catastrophe.Superpowers have at last realized the need for abandoning the production of lethal weapons.Mankind is heading towards complete destruction.Nations in possession of huge stockpiles of lethal weapons are trying hard to avoid actual conflict.

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