Adding buffering compounds to neutralize acids is used to address acid mine drainage.
Therefore, the correct option is C.
Adding lime or other alkaline materials to neutralize the acidity of the soil, as well as adding uncontaminated topsoil, planting vegetation, and modifying slopes to stabilize the soil and reduce surface water infiltration into the underlying contaminated material, are some of the common methods for cleaning up contaminated land. The most commonly used technique for treating AMD contamination is the use of alkaline reagents like lime, limestone, sodium carbonate, or sodium hydroxide. The purpose of this process is to neutralize acidic water and prevent the precipitation of heavy metals.
Acid mine drainage (AMD) is a global problem that has negative effects on the ecosystem. Because of its high acidity and high concentration of heavy metals and metalloids, AMD is harmful to both plants and animals as well as to people. Traditional AMD therapies have been in use for a very long time.
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- Lead acid batteries used in cars contain a concentrated
solution of sulfuric acid. When these batteries are
recycled, their sulfuric acid is drained and neutralized to
produce water and sodium sulfate. Suggest a compound
that could be used to neutralize sulfuric acid and produce
sodium sulfate. Justify your choice by writing the chemical
equation for the reaction.
As per the chemical reaction ,sodium hydroxide can be used for neutralization of sulfuric acid as,2 NaOH+H₂SO₄[tex]\rightarrow[/tex]Na₂SO₄ +2 H₂O.
What are chemical reactions?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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What do all waves have in common?
you can always see them
They carry energy
They absorb light
They do not carry energy
Answer:
I think it's carry energy, but I'm not sure
a stock solution of silver nitrate (agno3) is prepared by adding 97.364 g of silver nitrate to a 1000.00 ml volumetric flask and it is filled to the line with water. a 79.763 ml aliquote of the stock solution is added to a 200.00 ml volumetric flask and it is filled to the line with water. what is the molarity of the solution in the 200.00 ml flask?
The molarity of the silver nitrate solution in the 200.00 mL flask is 0.22856 M.
To calculate the molarity of the solution in the 200.00 mL flask, we must need the number of moles present and the volume (200.00 mL = 0.20000 L).
To obtain the number of moles present, we can calculate the mass of AgNO₃ in the 200.00 mL sample and then use the molar mass of silver nitrate (M = 169.87 g/mol) to calculate the number of moles.
So, if there's 97.364 g of silver nitrate in the 1000.00 mL flask, we can use a simple proportion to calculate the mass present in 79.763 mL:
97.364 g : 1000.00 mL = X : 79.763 mL
X = 97.364 g * 79.763 mL / 1000.00 mL = 7.7660 g
This same mass is present in the final 200.00 mL solution, as it is merely diluted. So, we can now calculate the number of moles (n) of silver nitrate:
n = m/M
n = 7.7660 g / 169.86 g/mol
n = 0.045712 mol
Finally, we can use this to calculate the molarity (c) of the final solution:
c = n/V
c = 0.045712 mol / 0.20000 L = 0.22856 M
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which statements correctly describe a polar covalent bond? i. electrons are shared but not equally by the two atoms. ii. one atom has a small negative charge, and the other atom has a small positive charge. iii. the bond dipole is zero. iv. one or more electrons are transferred from one atom to a second atom.
A covalent bond bond is appropriately described as occurring when one or even more electrons move of one atom to another.
what is covalent polar bond?a bond in which the two bound atoms' electron densities are unequally distributed as a result of either a difference in the electronegativity or the effects of induction.
A covalently bonded bond is represented by the water molecule, written as H2O. The oxygen atom is given more time with the electrons than for hydrogen atoms due to the unequal distribution of the electrons.
what is electron?The electron is an unit of matter with a negative zero elementary charge electric charge. Due to their lack of known components, electrons, which are part of the first generation of lepton particles family, are typically regarded to be elementary particles or substructure
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9. running a strong enough electric current through water will cause it to decompose into hydrogen and oxygen gas. write the balanced chemical equation for this process. what is being oxidized, and what is being reduced?
Answer:
Explanation: when electric current is passed through water, water dissociates into hydrogen and oxygen. Hydrogen is deposited over negative pole and oxygen is deposited over positive pole. Deposition of hydrogen and oxygen at different poles is visible in the form of bubbles.
Consider the hydrate calcium chloride dihydrate: cacl2 · 2h2o. how many hydrogen atoms are in the compound?
Consider the hydrate calcium chloride dihydrate hydrogen atoms are in the compound are four
Hydrate calcium chloride dihydrate is the excellent water soluble crystalline calcium sources used compatible with chloride and chloride compounds can conduct electricity when fused or dissolved in water and here given compound is CaCl₂ × 2H₂O
So in that compound the hydrogen atom are four because this compound or this equation is balanced so in that compound four hydrogen atom are present
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Answer:
4
Explanation:
how many atoms are in 2.5 moles of c4h802
Answer:
1.505 × 10²⁴ atomsExplanation:
To find the number of entities in a given substance we use the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
n = 2.5 moles
We have
N = 2.5 × 6.02 × 10²³ = 1.505 × 10²⁴
We have the final answer as
1.505 × 10²⁴ atomsHope this helps you
if you take a square tlc plate and develop a compound mixture with one solvent mixture, dry the plate, and later develop it with a different solvent mixture; you can separate one set of compounds well and then separate another set of compounds well. in which directions should you develop the tlc plate with the two different solvent mixtures? this technique is often used to separate molecules of biological interest.
You should develop the TLC (thin layer chromatography) plate orthogonally (under a 90-degree angle) to the original direction of development (along its width, while the original development was along the length of the TLC plate).
This technique is called 2D TLC (two-dimensional thin layer chromatography) and is usually employed to analyze and preparatively separate very complex mixtures that cannot be separated using only one solvent system. The initial development (along the length of the TLC plate) enables crude separation into groups of compounds with similar retention factor (Rf). These groups can then be further separated using a different solvent system by developing the same TLC plate along its width.
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3. An object that has a volume of 2500 cm³ is dropped into a vat of corn syrup. What is the buoyant force on the object? (The density of corn syrup is 1.38 g/cm³.)
Answer:3.381 X 10^(-11)
Explanation:
The formula for buoyant force is F = -Volume*density*gravitational acceleration. Convert volume and density to SI units and then apply them in the formula where gravitational acceleration is 9.8m/s^2. Done
the molar mass of the metal hydroxide m(oh)4 is 118.97 g/mol. what is the molar mass of the sulfide of this metal? provide your answer in decimal notation, rounded to 2 decimal digits (i.e. to the hundredths place).
The molar mass of the metal Sulfide is 83.02g/mol.
The molar mass of Sulfide is the addition of molar mass of Sulphur with molar mass of given metal which is given by subtract the molar mass of hydroxide from total molar mass of metal hydroxide.
The molar mass of the [tex]M(OH)_{4}[/tex] =118.97g/mol
Molar mass of Oxygen = 15.999g/mol
Molar mass of Hydrogen= 1.008g/mol
Therefore:
molar mass of [tex]M(OH)_{4}[/tex]= (molar mass of M) +4(molar mass of oxygen + molar mass of hydrogen)
118.97=(molar mass of M)+(15.999 x4)+(1.008x4)
118.97=(molar mass of M)+(63.996+4.032)
118.97-68.028=molar mass of metal(M)
molar mass of Metal=50.942 g/mol (that is Vanadium)
Molar mass of metal + molar mass of Sulphur to give metal sulfide.
50.942+32.06=83.02g/mol
Hence, the molar mass of Vanadium Sulfide([tex]V_{2} S_{5}[/tex] ) is 83.02g/mol.
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according to laplace's law: group of answer choices should remain inflated because the pressure inside of the alveoli is greater than atmospheric pressure should remain in a stable state should increase gas exchange during inhalation
According to Laplace's law lungs should remain inflated because the pressure inside of the alveoli is greater than atmospheric pressure.
According to this law of Laplace, if the radius of the blood vessel is larger than the wall tension required will be larger in order to withstand or overcome the pressure which is exerted by internal fluids or gases.
The alveoli are to remain inflated as the gaseous pressure which is developed inside the alveoli is greater than the pressure of atmosphere.
When the blood vessel thickens or its thickness increases, it will result in the reduction of the tension developed by the gas at a given constant pressure.
It was published in a research paper that according to law of Laplace, lung should remain inflated because air pressure in alveoli is more than the pressure of the atmosphere.
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if use a sepratory funnel containing a phenol with methylene chloride and an nahco3, where will the phenol be located? the answer is organic and bottom layer, but why is that and how do we answer similar questions?
phenol does not react with NaHCO3 , phenol solubility in water is very less about 8g in 100mL of water , so it will be present in organic layer (methylene chloride) , methylene chloride has a density of 1.33g/mL greater than water so it will be below layer in which phenol is present.
What is the function of separatory funnel?Immiscible liquids are separated using a separatory funnel, or sep funnel. Two layers appear in a separatory funnel when two immiscible liquids are added. The lower layer will be made up of the denser solvent. Most halogenated solvents are less dense than water, but most non-halogenated solvents are.
A separating funnel is used by adding the two phases and the mixture to be separated via the top while keeping the stopcock at the bottom closed. After then, the funnel is shut and gently shaken by being inverted several times. If the two solutions are combined too vigorously, emulsions will form.
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you add 13.90 ml of 0.370 m ba(oh)2(aq) to 45.00 ml of 0.300 m hydrochloric acid, hcl(aq). if necessary use ka and kb values from the equation sheet provided chem iii eqn sheet a. enter the formula of the chemical species predominantly present in solution that will determine the ph. formula h3o preview: h3o (aq) b. what is the ph? 0.848
The predominant chemical species affecting the pH is H₃O⁺, but the pH value of the resulting solution is actually 1.26.
To calculate the pH value of the resulting solution we need the number of moles of H⁺ ions (n) and the volume of the solution (V). The volume is easy - it is the sum of the volumes of the barium hydroxide solution (13.90 mL = 0.01390 L) and the hydrochloric acid solution (45.00 mL = 0.04500 L)
V(total) = V(Ba(OH)₂) + V(HCl)
V(total) = 0.01390 L + 0.04500 L = 0.05890 L
Now we need to calculate the number of moles of H⁺ (H₃O⁺) ions. The number of moles of H⁺ ions in the HCl solution is:
n(H⁺) = c(HCl) * V(HCl)
n(H⁺) = 0.300 M * 0.04500 L = 0.0135 mol
On the other hand, the number of moles of OH⁻ ions is double the number of moles of barium hydroxide, because 1 mol of barium hydroxide releases 2 moles of OH⁻ ions:
n(OH⁻) = 2 * c(Ba(OH)₂) * V(Ba(OH)₂)
n(OH⁻) = 2 * 0.370 M * 0.01390 L = 0.010286 mol
The number of moles of H⁺ ions is greater than the number of moles of OH⁻ ions, so after the neutralization, we will have an excess of H⁺ ions:
n(H₃O⁺) = n(H⁺) - n(OH⁻)
n(H₃O⁺) = 0.0135 mol - 0.010286 mol = 0.003214 mol
We can now finally calculate the concentration of H₃O⁺ ions in the final solution:
c(H₃O⁺) = n(H₃O⁺) / V(total)
c(H₃O⁺) = 0.003214 mol / 0.05890 L = 0.05457 M
From this, we can find the pH value of the solution:
pH = -log(c(H₃O⁺))
pH = -log(0.05457)
pH = 1.26
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Synthetic materials are not found in nature and therefore they are typically developed in laboratories.
True
False
Answer: True
Explanation: Synthetic materials are not found in nature and can be created in labs using chemicals and compounds.
unit 3 balancing lab chemistry
HELP PLEASEEEEEEE
1. zn___AgCI->___ZnCI2+___Ag
2. FeCI3+___H2s->___FeCI2+___HCI+___s
3. ___Ag2O->___Ag+___O2
4.AI2O3->___AI+___O2
5.K+___H2O->___KOH+___H2
6. Caco3->___CaO+___CO2
7. MG+___O2->Mgo
8. CO+___Fe2O3->___Fe+___CO2
9. H2+___Fe2O3->___Fe+___H2O
10. ___HCI+ZN->___H2+___ZnCI2
zn + 2 AgCI-> ZnCI2+ 2Ag
2 FeCI3+ 3 H2s->___FeCI2+ 6 HCI+___s
2 Ag2O-> 4 Ag+ O2
4AI2O3-> 3 AI+ 2O2
2 K+ 2H2O-> 2 KOH+ H2
Caco3-> CaO+ CO2
2 MG+ O2-> 2MgO
CO+ 3 Fe2O3-> 2 Fe+ 3CO2
2 H2+ 3 Fe2O3-> Fe+ 3H2O
HCI+ 2 ZN-> H2+ ZnCI2
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Simple expriment with Candle that Show the necessary of air far t burining Cansiser how the Scientific method in this Simple experment with air for buring under to d/F Conditions Applies in this necessary
Answer:
use a tumbler to cover a candle that is burning, after a few minutes it turns off automatically without any external forces due to the absence of oxygen
Explanation:
aqueous ammonia is commercially available at a concentration of 16.0 m. how much of the concentrated solution would you use to prepare 500.0 ml of a 1.90 m solution?
Volume of 16.0 m aqueous ammonia solution required to prepare 500.0 ml of a 1.90 m solution is 50ml
What is molarity?Molarity is used to describe the concentration of a solution. Molarity, also called molarity, is the number of moles of solute (dissolved substance) per liter of solution. The unit of molarity is moles per cubic decimeter, written as mol dm⁻³ or simply M. A cubic decimeter is the same as a liter. In many old textbooks you can find concentrations in moles/liter written as mol l⁻¹
Original concentration x initial volume = final concentration x final volume.
We will use the equation (M₁)(V₁) = (M₂)(V₂)
Given,
M₁ = 16.0 m
M₂ = 1.90 m
V₂ = 500.0 ml or 0.5L
So, 16 × V₁ = 1.90 × 0.5
16 V₁ = 0.9 m
V₁ = [tex]\frac{0.9}{16}[/tex]
V₁ = 0.05L or 50ml
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what could you do to increase the electric force between to charged particles by a factor of 16
In other to increase the electric force between two charged particles by a factor of 16, the charged particle is increased by 16.
What is Electric force?This is referred to as the repulsive or attractive interaction between any two charged bodies and we should note that like poles repel and unlike poles attract.
One of the charged particle has to be increased by 16 for there to be an increase in the electric force between the particles by a factor of 16 and it can seen below:
F1/ F2 = kq1q2/r² / 16kq1q2 / r² where f is force, q is the charge and r is distance between charges.
F1 / F2 = 1/16
F2 = 16F1
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which compound will distill first? group of answer choices the compound with the lower density the compound with the lower boiling point the compound with the higher boiling point the compound with the higher density the compound with the lower molecular weight the compound with the higher molecular weight
Answer:
So, liquid H2 will be distilled first, after this liquid N2 will be distilled, followed by liquid O2 and liquid CO2 will be distilled last.
The compound will lower molecular weight will distill out first as it will evaporate fast.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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Consider a 3-atom molecule a-b-a for which b has a total of only two valence electrons. If you assume that b is a group ii metal, what is the bond angle for a-b-a? please answer in degrees to the nearest whole number.
Consider a 3-atom molecule a-b-a for which b has a total of only two valence electrons if you assume that b is a group ii metal, then the bond angle for a-b-a is 180 degree
Valence electron is the s and p electron in the outermost shell and electron present in the inner shell are core electron and according to the valence shell electron pair repulsion theory and we that bond angle that an atom has with its neighbor which also called dihedral angle a group II metal has two valence electron there it can form only single bond then b will not have any lone pair and the ones digit in the group number is the number of valence electron and 180 degree bond angle means the atom are connected in straight line called 180 degree bond
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in a buffer containing acetic acid (ch2cooh) and sodium acetate (nach2coo-) at a ph of 5, if the concentration of sodium acetate is 100. mm, what is the concentration of acetic acid?
By using the Henderson-Hasselbalch equation, we can calculate that the concentration of acetic acid in the given buffer is 57.5 mM.
When calculating the pH value of a buffer system, we use the Henderson-Hasselbalch equation:
[tex]pH = pK_{a} + log\frac{[base]}{[acid]}[/tex]
pKa - the negative logarithm of the acidic constant (for acetic acid, pKa = 4.76)
[base] - concentration of the basic (sodium acetate) component
[acid] - concentration of the acidic (acetic acid, AcOH) component
If we plug the known values (pH = 5; [base] = 100 mM; pKa = 4.76) in the equation we get:
[tex]5 = 4.76 + log\frac{100 mM}{[AcOH]}[/tex]
[tex]log\frac{100 mM}{[AcOH]} = 5-4.76[/tex]
[tex]log\frac{100 mM}{[AcOH]} = 0.24[/tex]
[tex]\frac{100 mM}{[AcOH]}= 10^{0.24}[/tex]
[tex]\frac{100 mM}{[AcOH]}= 1.74[/tex]
[AcOH] = 100 mM / 1.74
[AcOH] = 57.5 mM
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If an Element has 67 Protons and 68 Neutrons, how many electrons does the element have?
Answer:
67 electrons
Explanation:
Most of the time, the number of protons is the same as the number of electrons because of their relation.
Consider the reaction.
2Pb(s)+O2(g)⟶2PbO(s)2Pb(s)+O2(g)⟶2PbO(s)
An excess of oxygen reacts with 451.4 g of lead, forming 341.8g 341.8 g of lead(II) oxide. Calculate the percent yield of the reaction.
percent yield: _________ %
The percent yield of the reaction with formation of lead oxide is 70.29%.
What is percent yield?Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.
In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .
In the given problem, 2 moles of lead produce 2 moles of lead oxide
That is, 414.4 g lead produces 446.4 g of lead oxide
hence,451.54 g lead will produce 451.4×446.4/414.4=486.251 g which is the theoretical yield
Now by substituting the values in the formula,341.8/486.251 ×100=70.29%
Hence, the percent yield of the reaction is 70.29%.
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The enzyme that catalyzes the synthesis of atp as hydrogen ions flow down their concentration gradient is called.
The enzyme that catalyzes the synthesis of ATP as hydrogen ions flow down their concentration gradient is called ATP synthase.
What is ATP synthase?In the inner mitochondriаl membrаne, hydrogen ions hаve just one chаnnel аvаilаble: а membrаne-spаnning protein known аs АTP synthаse. Conceptuаlly, АTP synthаse is а lot like а turbine in а hydroelectric power plаnt. Insteаd of being turned by wаter, it’s turned by the flow of hydrogen ions moving down their electrochemicаl grаdient. Аs АTP synthаse turns, it cаtаlyzes the аddition of а phosphаte to АDP, cаpturing energy from the proton grаdient аs АTP.
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Which of the following compounds contains the greatest percent by mass of nitrogen
Answer:
[tex]A\colon NH_3[/tex]
Explanation:
Here, we want to get which of the compounds have the highest percentage by mass of nitrogen
What we have to do here is to divide the mass of nitrogen atoms in the compound by the molecular mass of the compound
a) NH3
The atomic mass of nitrogen is 14 amu, the atomic mass of hydrogen is 1 amu
The molar mass is thus 14 + 3(1) = 17 g/mol
The percentage by mass of nitrogen will be
14/17 * 100 = 82.35 %
b) HCN
The atomic mass of carbon is 12 amu
Thus, we have the molar mass as
1 + 12 + 14 = 27 g/mol
Percentage of nitrogen by mass will be : 14/27 * 100 = 51.85 %
c) For N2O
The atomic mass of oxygen is 16 amu
The molar mass of the compound will be 14(2) + 16 = 44 g/mol
Percentage of nitrogen by mass will be = 28/44 * 100 = 63.64 %
d) NI3
The atomic mass of iodine is 127 g/mol
So the molar mass of the compound will be:
14 + 3(127) = 395 g/mol
Percentage by mass of nutrogen will be
14/395 * 100 = 3.54 %
From what we have, the highest percentage by mass of nitrogen is 82.35 % and that belongs to ammonia (NH3)
Which of the following provides the best evidence that organ systems in the human body interact with one another
The best evidence that organ systems in the human body interact with one another is shivering in response to sensing in the cold environment
Organ system is the group of tissue that work together for the overall function of organ and also organ system is the group of organ that work together to perform a specific function and the human organ consist of eleven organ system and that is respiratory, execratory, circulatory, digestive etc and the best evidence that organ systems in the human body interact with one another is shivering in response to sensing in the cold environment because when your muscle and skeletal system are working to help your body increase heat when shivering
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Eriq, a chemist, is running tests with four unknown elements. He has found that they all bond the same way, so he knows that they are in the same group on the periodic table of elements.
The table shows other properties that Eriq observed.These four elements are most likely in group
15.
16.
17.
18.
Answer:
17
Explanation:
br is liquid
cl is gas
and iodide is solid
8) There is only one naturally occurring isotope of beryllium, Be-9. Explain why the atomic
mass of this isotope is the same value as the "average atomic mass" for beryllium found
on the periodic table.
Answer:
The average atomic mass for an element is calculated by summing the masses of the element's isotopes, each multiplied by its natural abundance on Earth. Since beryllium has only one naturally occurring isotope. The average atomic mass of beryllium is the mass of Be-9 isotope multiplied by 100%.
Explanation:
Which of the following is true about photochemical smog?
It hardens metals and stones.
It creates a gray haze in the air.
It exists in damp, cold weather.
It is formed from nitrogen oxides.
Photochemical smog is formed from nitrogen oxides.
What is photochemical smog?When the sun's ultraviolet rays interact with the atmosphere's nitrogen oxides, photochemical smog is created. It appears as a brown haze and is most noticeable in the morning and late afternoon, particularly in warm, densely populated places.
Although the formation of photochemical haze is a complicated process, its origin is relatively clear. While coal-fired power plants and some other power plants also produce the required pollutants to permit its manufacturing, automobiles are the main contributor.
Therefore, Photochemical smog is formed from nitrogen oxides.
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The photochemical smog is formed from nitrogen oxides. Thus option D is correct.
What is photochemical smog?Photochemical smog is defined as a combination of pollutants that are produced when sunlight interacts with nitrogen oxides and volatile organic compounds (VOCs), resulting in a brown haze above cities.
It is also defined as a brownish-gray haze brought on by the sun's UV rays reacting with the atmosphere's hydrocarbon and nitrogen oxide pollution.
When volatile organic molecules and nitrogen oxides interact with sunlight, photochemical smog is formed, which is comparable to a mixture of contaminants.
Thus, the photochemical smog is formed from nitrogen oxides. Thus option D is correct.
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What atom matches this electron configuration?
1s22s22p63s2 3p64s23d104p65s24d105p66s24f145d9
Mercury
Thallium
Gold
Platinum
Answer:
Gold
Explanation:
To recognize what element this is, we can simply look at the last orbital (5d9) and go to the periodic table and see what element is in that final orbital.
We go to row 6 (because of the 6s orbital at the beginning of this row) and then we see that our 6s orbital is full with 2 electrons, then our 4f orbital is full with 14 electrons, and our 5d orbital is not full where we only have 9 electrons instead of 10.
We then go to our 5d orbital and count 9 times into that orbital and end up with our final element being Gold (Au).
