The level of water in the graduated cylinder is 12.5 cm higher than the level of the water exposed to the atmosphere, The total pressure of gases inside the graduated cylinder is 614 mmHg
given that :
The atmospheric pressure is 739 mmHg
The level of water in graduated cylinder = 12.5 cm = 125 mmHg
the expression for the pressure is given as :
P total = P atm - hρg
where , hρg = 125 mmHg
P atm = 739 mmHg
putting the values , we get :
P total = P atm - hρg
= 739 mmHg - 125 mmHg
= 614 mmHg
Thus, the total pressure inside the graduated cylinder is 614 mmHg.
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Potassium iodide is an ionic compound. (i) describe what happens, in terms of electron loss and gain, when a potassium atom reacts with an iodine atom.
Iodine atoms gain electrons in this process, resulting in negatively charged iodide ions, while potassium atoms lose electrons, resulting in positively charged potassium ions. There is oxidation and reduction.
What does oxidation mean?The oxidation status of the substrate can change during redox reactions. Similar to how losing electrons or increasing the oxidation state is oxidation while gaining electrons is reduction.
When oxygen comes into contact with a material or an element, an oxidation reaction occurs. Another way to look about oxidation is as the procedure through which the species of reactants lose their hydrogen. Oxidation is the loss of electrons in a molecule, an atom, or an ion.
Oxidation reactions produce new functional groups in molecules or change existing functional groups in molecules.
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A beaker contains a 25 ml solution of an unknown monoprotic acid that reacts in a 1:1 stochiometric ratio with naoh. Titrate the solution with naoh to determine the concentration of the acid.
The molarity of the acid is : 0.82 Molar
Calculate the molarity of acid?
Volume of acid = 25 ml
Molarity of base = 0.5 M
Volume of base = 41.00 ml
Since, acid and base reacts in 1:1 stoichiometric ratio, we can use the molar equivalence formula as:
M(acid) × V(acid) = M(Base) × V(Base)
M(acid) = 0.82 M
What is Molarity?
Molarity (M) is the amount of a substance in a given volume of solution. Molarity is defined as the number of moles of solute per liter of solution. Molarity is also called the molarity of a solution.
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Given 5.67 x 1023 molecules of NaF, how many moles are present?
Answer:
a
Explanation:
This element is in the noble gas family and has 5 energy levels.
The noble gas family includes the element xenon, which has five different energy levels.
What is noble gas?Any of a class of rare gases with high stability and very low reaction rates, such as helium, neon, argon, krypton, xenon, and occasionally radon. also known as inert gas. A collection of chemical elements known as the noble gases have a number of things in common. Under typical circumstances, they are all monatomic, tasteless, and colourless gases with low chemical reactivity. Helium, neon, argon, krypton, xenon, and radioactive radon are the six types of noble gases that are found in nature. Noble gases have entirely filled outer electron shells, are most frequently encountered as monatomic gases, and have no tendency to combine with other elements. As a result, they extremely infrequently form compounds with other elements. But it is conceivable to cause a noble gas to respond, just as one might force a nobleman to lose his honor.
Where is noble gas and what is noble gases used for?Due to their filled valence shells (octets), which render them incredibly nonreactive, the noble gases (Group 18), which are found at the far right of the periodic table, were formerly known as the "inert gases." Compared to other element groupings, the noble gases were characterized at a relatively late stage.
The noble gases are employed to create inert atmospheres, usually for arc welding, to shield specimens and prevent chemical reactions. The substances are utilized in lasers as well as lamps like neon and krypton headlamps.
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current u.s $1 coins are composed of manganese-brass consisting of 6.0% zinc, 3.5% manganese, 2.0% nickel, and the remaining Cu. each dollar has a total mass of 8.1 G. Calculate the mass of each of the four metal constituents in the dollar coin 
The mass of the zinc in the dollar coin is about 0.486 grams, the mass of the manganese is about 0.285 grams, the mass of the nickel is about 0.162 grams, and the mass of the copper is about 7.135 grams.
What is an alloy?
An alloy is the mixture of two or more elements, at least one of which is a metal. Alloys are typically created to improve upon the properties of the individual metals, such as increasing strength or corrosion resistance. They are used in a wide range of applications, including in the construction of buildings, vehicles, and electronic devices. The specific properties of an alloy depend on the metals that it is made of and the proportion of each metal in the mixture.
According to the problem:
The mass of each metal in the dollar coin has some specific percentage.
Multiply the percentage composition of the metal by the total mass of the coin to determine the mass percentage for each metal:
Zinc: [tex]6.0\% \times 8.1 grams = \frac{6.0}{100} \times 8.1=0.486 grams[/tex]
Manganese: [tex]3.5\% \times 8.1 grams = \frac{3.5}{100} \times 8.1=0.285 grams[/tex]
Nickel: [tex]2.0\% \times 8.1 grams = \frac{2.0}{100} \times 8.1=0.162 grams[/tex]
Copper:
[tex](100\% - 6.0\% - 3.5\% - 2.0\%) \times 8.1 grams = 88.5\% \times 8.1 grams = \frac{88.5}{100} \times 8.1=0.486 grams[/tex]
So the mass of the zinc in the dollar coin is about 0.486 grams, the mass of the manganese is about 0.285 grams, the mass of the nickel is about 0.162 grams, and the mass of the copper is about 7.135 grams.
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Which of the following is true of real machines?
The statement that is correct about real machines is that work output is less then work input. So the correct option is A.
Why the statement is correct?This is correct because in a real machine the production of work will never be greater than the input it has of work, since the machines themselves will lose energy in some way during the formation of the production of work. When losing energy, then, there will be less production and material than there was at the beginning of production.
This is quite the opposite in an ideal machine, where all the work that will be put in becomes the work output. It changes because in the ideal situation it does not take into account various variables that occur in reality that can cause energy to be lost in the process.
Therefore, we can confirm that the correct option is A. work output is less then work input.
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Which of the following is true of real machines?
A. work output is less then work input
B. work output equals work input
C. work input is decreased because of friction
D. work output is greater than work input
Referring to the drawing to the right.the beaker contains a 5% salt solution and the bag contains a 15%salt solution in which direction will water move
According to the concept of diffusion the water will move from 5% salt solution to 15%salt solution.
What is diffusion?Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.
There are 2 main types of diffusion:
1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.
2) facilitated diffusion- It is a passive movement of molecules across cell membrane from higher concentration region to lower concentration.
There are 2 types of facilitated diffusion one is osmosis and dialysis.
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Which energy output objects work with the solar panels?
Answer:
The energy output objects that work with solar panels include solar inverters, charge controllers, batteries, and electric grid systems.
Explanation:
Why are 6 co2 molecules required during the calvin cycle to make one molecule of glucose?.
6 co2 molecules required during the calvin cycle to make one molecule of glucose beacuse One carbohydrate molecule requires six rounds of the Calvin cycle to create since it contains six carbon atoms (one for each carbon dioxide molecule fixed).
What is calvin cycle?
The C3 cycle is another name for the Calvin cycle. The process by which the carbon from the carbon cycle gets fixed into sugars is a series of chemical processes. The chloroplast of the plant cell is where it takes place.
Because the main stable intermediate is the 3-carbon compound glyceraldehyde-3-phosphate, C3-type plants—so named because it is their most frequent set of carbon fixation reactions—are observed. The Calvin cycle, which best describes these reactions.
The processes of photosynthesis that utilise the energy accumulated by the light-dependent reactions to create glucose and other carbohydrates molecules are known as the Calvin cycle.
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write any two utilities of the radiation obtained from nuclear reaction
Answer: Radiation (obtained by nuclear reactions) is used in medicine, academics, industry, and electricity. In addition to that, radiation has been useful in areas such as agriculture, archaeology, space exploration, law enforcement, geology, and many others.
The radiation emitted from nuclear reactions are used in various fields such as medical field, agriculture, research fields etc.
What is nuclear reaction?Unstable radioactive elements undergo emission of charged particles such as alpha or beta and produce their isotopes or new elements. This reactions involving the change to atomic nuclei by reducing the number of protons or neutrons is called nuclear reactions.
The radiation emitted from nuclear reaction is very useful in many fields, especially in medical fields. Many diagnostic techniques are based on radiation. Similarly radiation is used in cancer treatments.
Suitable radiations are used in agricultural field for pest control. There is a branch itself in science to study the various utilities of radiations and there are tremendous experiments and researches are conducted based on suitable radiations.
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Which body systems within marching band members are interacting so they can play their instruments while walking in the parade? List the systems below.
Squirrel: Digestive, Circulatory, Muscular, and Nervous systems.
Soccer: Skeletal/muscular, circulatory, respiratory, and body systems.
What is body systems?For Squirrel:
The digestive system functions to break food down into smaller pieces that are more suitable for swallowing and absorbing the available nutrients. It transports to various cells of living organisms.
musculature allows animals to keep their balance on branches and avoid falling.
The nervous system controls all living things. The nervous system controls all physical activity. Among many other functions, it is involved in maintaining balance and maintaining alertness during meals.
Soccer player:
This person is trying to hit the ball to score a goal. He seems to be adjusting his arms and legs to allow this.
The muscular and skeletal systems work together to support and strengthen the body. They allow the movement of the whole body to reach the target.
The respiratory system is also involved in this person's running performance. He has to breathe constantly to get enough oxygen while running and exhaling exhaust fumes.
The circulatory system transports oxygen to various cells in the body that use it on demand, especially muscle cells. The system also removes waste.
The nervous system controls all physical activity. It performs a variety of functions, including maintaining balance and coordination while running, alerting other players and focusing on the ball, and controlling a player's thoughts and strategies during the game.
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Determine the empirical formula of a compound containing 0.928 g of gallium and 0.412 g of phosphorus.
Empirical formula of a compound can be determined using their number moles in the given weights. Thus number of moles of both gallium and phosphorous are 0.013 . Thus, empirical formula of this composition is GaP.
What is empirical formula?Empirical formula of a compound is derived from the number of moles of each element present in the compound. It will be different from the molecular formula of the compound.
Atomic mass of phosphorous = 31 g/mol
Atomic mass of gallium = 69.72 g/mol
Number of moles of 0.412 g of P = 0.412 g/31 g = 0.013.
No.of moles in 0.928 g of Ga = 0.928 / 69.72 = 0.013.
The ratio of their number of moles = 0.013 :0.013 = 1 :1.
Therefore, the empirical formula of the compound containing 0.928 g of gallium and 0.412 g of phosphorus is GaP.
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11. Calculate the relative atomic mass of uranium using the percent abundances given.
238U-50%
235U-20%
234U-30%
Answer:
Relative atomic mass of uranium = (238 x 0.50) + (235 x 0.20) + (234 x 0.30) = 236.3
Nuclear decay occurs according to first-order kinetics. How long will it take for a sample of titanium-45 to decay from 65.0 grams to 25.0 grams? The half-life of titanium-45 is 3.08 hours 2.15 hours 32.9 hours 5.13 hours
A sample of titanium-45 will degrade from 65 grams to 25 grams in 4.24 hours.
The formula for the half-life of a first-order reaction is = 0.693/k.
Half-life is 3.08 hours, given.
So k = 0.225
First order reaction rate is calculated using:
where k is the reaction rate and 0.225 is the reaction time
R' = 25g, the total quantity.
original quantity = 65g
With these parameters entered, we obtain t=4.24 hours.
As a result, a sample of titanium-45 will degrade from 65.0 grams to 25.0 grams in 4.24 hours.
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vessel a contains co(g) at 0 oc and 1 atm. vessel b contains so2(g) at 20 oc and 0.5 atm. the two vessels have same volume. a. which vessel contains more molecules? b. which contains more mass? c. in which vessel is the average kinetic energy of molecules higher? d. in which vessel is the rms speed of molecules higher?
Vessel B has more mass. Explanation: Because temperature and average kinetic energy of molecules are directly proportional to each other.
The average kinetic energy of a substance's particles is directly inversely correlated with its temperature. As the temperature increases, the particles must travel more quickly because their mass remains constant.
The relationship between a gas particle's average kinetic energy and temperature is linear. The pace at which the gas molecules flow rises with temperature. At a specific temperature, the average kinetic energy of all gases is identical.
Molecules of gas move more quickly when they are lighter. Because of this, as the gas's temperature rises, its volume also does so. The more gas particles there are, the more likely it is that they will hit the container's walls, hence the frequency of collisions must rise.
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which gas sample has the greater mass
Answer:
what are the gas samples
Identifying Parts of a Chemical Reaction
Given chemical reaction,
Glucose + Oxygen → carbon dioxide + water
Reactants : Glucose and oxygen.
Products : carbon dioxide and water.
Parts of chemical reaction:Each chemical reaction is made up of three main components: the reactants (located on the left side of the reaction equation), the products (located on the right side of the reaction equation), and the particular reaction conditions, which are listed above or below the arrows in the middle of the reaction equation.
Combustion is one of the five fundamental types of chemical reactions, along with combination, decomposition, single-replacement, and double-replacement. You can classify a reaction into one of these groups by looking at the reactants and products of the reaction in question. It is possible for some reactions to fall into more than one category.
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kiki makes a table to compare the particles in a magnesium atom to those in a magnesium ion. a 3 column table with 3 rows. the first column is not labeled but have entries protons, neutrons, electrons. the second column is labeled magnesium atom with entries 12, 12, 12. the last column is labeled magnesium ion with entries x, y, z. she knows that a magnesium ion has an electric field that points away from the ion. what values should she use to complete her table?
The neutral magnesium atom has 12 protons, 12 neutrons, and 12 electrons.Ten electrons, twelve protons, and twelve neutrons make up the magnesium ion.
Protons, neutrons, and electrons make up an element's atom. Protons and electrons are distributed equally among neutral atoms. Gain or loss of electrons causes the formation of ions.
For the atom of magnesium: The neutral magnesium atom has 12 protons, 12 neutrons, and 12 electrons.
Regarding the magnesium ion:
It possesses two less electrons than the magnesium ion. As a result, there are 10 electrons, 12 protons, and 12 neutrons in each magnesium ion.
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Answer:B:12 12 10
Explanation:edge
Which TWO of the following changes can be classified as physical
A. Ice melting on a warm day
B. Fireworks going off on July 4th
C. Baking soda reacting with vinegar
D. Glass shattering as it hits the floor
The two changes that can be classified as physical are as follows:
Ice melting on a warm day (option A)Glass shattering as it hits the floor (option D).What is a physical change?A physical change in chemistry is a change affecting the form of a chemical substance, but not its chemical composition.
When matter changes its observable properties, we can say it has undergone a physical change.
Physical change is a type of change where the physical properties of matter change. Physical changes include;
State of matterchange in colourchange in odoursolubilityTherefore, melting of ice, which is a change of state and shattering of glass are examples of physical change.
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How many moles of chlorine gas can be produced if 4 moles of fecl3 react with 4 moles of o2.
6 moles of chlorine gas can be produced if 4 moles of fecl3 react with 4 moles of o2.
FeCl3+O2-->Fe2O3+Cl2 is not balanced.
We first need to balance the equation. The balanced equation:
4FeCl3 + 3O2 ==> 2Fe2O3 + 6Cl2
moles FeCl3 present =4 moles
moles O2 present = 4 moles
Since the mole ration in the balanced equation is 4 FeCl3 : 3 O2, the limiting reactant will be FeCl3.
So, moles Cl2 that can be produced = 4 moles FeCl3 x 6Cl2/4 moles FeCl3 = 6 moles Cl2.
What do you mean by Chlorine gas?
Chlorine gas is a greenish-yellow gas with a pungent odor that is highly toxic and corrosive. It is often used as a disinfectant and bleach in water treatment and swimming pools. Exposure to chlorine gas can cause severe irritation of the eyes, skin, and respiratory tract, and can even be fatal in large doses.
What are Moles?
Moles are a unit of measurement in chemistry used to measure the amount of a substance. The mole is defined as the amount of a substance that contains as many elementary entities (atoms, molecules, ions, etc.) as there are atoms in exactly 12 grams of carbon-12. The mole is a base unit in the International System of Units (SI) and has the symbol mol.
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At the end of the diffusion process, the concentration of substances on each side is.
At the end of the diffusion process, the concentration of substances on each side is. equal. This is because the diffusion process causes the substances to move from areas of high concentration to areas of low concentration until they are evenly distributed.
What is concentration?
Concentration in chemistry is calculated by dividing a constituent's abundance by the mixture's total volume. Mass concentration, molarity, number concentration, as well as volume concentration are four different categories of mathematical description. Any type of chemical mixture can be referred to by the term "concentration," but solutes as well as solvents in solutions are most frequently mentioned. There are different types of molar (amount) concentration, including normal concentration as well as osmotic concentration. The word "concentration" is derived from the French verb "concentrer," which means "to put at the centre" and comes from the root con-.
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66.7 mL of Ethanol was dissolved in 222.2 mL of water. What is the volume % of the ethanol in the solution?
Respond with the correct number of signficant figures in scientific notation. (Use E notation and only 1 digit before decimal, for example, 2.5E5 for 2.5 times 10 to the power of 5)
66.7 mL of Ethanol was dissolved in 222.2 mL of water. the volume % of the ethanol in the solution is 30.0 %.
Given that :
volume of the solute = 66.7 mL
volume of the solution = 222.2 mL
by using the volume % formula we can directly determine the volume % of ethanol, the percent by volume expression is given as :
volume % = (volume of solute / volume of solution ) × 100 %
volume % = (66.7 / 222.2 ) × 100 %
volume % = 0.300 × 100 %
volume % = 30 .0 %
( v / v ) % = 30.0 %
Thus, the percent by volume is 30.0 %.
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how many electrons can be contained in all of the orbitals with a principle energy level of 3?
Answer:
Thus, the second principal energy level can hold up to eight electrons, two in the s orbital and six in the p orbital. The third principal energy level has one s orbital, three p orbitals, and five d orbitals, which can each hold up to 10 electrons. This allows for a maximum of 18 electrons.
what volume of methane gas, ch4, has the same number of atoms as 6.00 l of krypton gas at the same temperature and pressure?
6l volume of methane gas, ch4, has the same number of atoms as 6.00 l of krypton gas at the same temperature and pressure.
The Avogadro's law can be used to connect the volume of the gas to its number of moles. This law asserts that at the same temperature and pressure, gases with the same molar amount will occupy the same volume. The number of atoms in the two gases must be equal if the number of moles is the same. Accordingly, if Kr and methane both have the same number of particles, their respective volumes would be the same.
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How many liters of carbon dioxide are produced in the combustion of 1.00 g of octane, C8H18?
2C8H18 + 25O2 --> 16CO2 + 18H2O
Answer:
1558.27 ml or 1.56 L
Explanation:
The molecular mass of octane is 114.23 g/mol so 1.00 g of octane equals to:
(1.00 g( x (1 mol/114.23g) = 0.00875 mol
From the chemical equation:
2C8H18 + 25O2 --> 16CO2 + 18H2O
you know that 2 mol of octane will produce 16 mol of CO2
so 0.00875 mol of octane will produce:
0.00875 x (16/2) = 0.07 moleof CO2
The molecular mass of CO2 is 44.01 g/mol so 0.07 mol will equal to
44.01 x 0.07 = 3.0807 g of CO2
Under “standard” conditions of 0 degrees Celsius and 1 atmosphere of pressure, carbon dioxide exhibits a density of 0.001977 g/mL
since d = m/V => V = m/d = 3.0807/0.001977 = 1558.27 ml or 1.56 L
NOTE: if you have a specific temperature or pressure, you can use the formula for ideal gas PV=nRT to solve for volume.
I hope this helps you to understand the question
why should care be taken tha tht easample is above the solvent level before the tlc plat eis placed into the devleioping hcambe
If the solvent level covers the sample, the sample spot will be washed off into the solvent before it travels up the TLC plate
The intermolecular interactions between the solvent and the solute are the main determinant of the solubility of the solute in a given solvent. The solute will dissolve in the solvent if the solvent surrounds and solvates the solute. In contrast to interactions between the solute and other solutes or between the solvent and other solvents, the solute must therefore create greater interactions with the solvent in order to dissolve. It is questionable if a homogeneous solution will develop in a mixture if the solvent-solute interactions are weaker than the solvent-solvent interactions and the solute-solute interactions.
why should care be taken tha tht easample is above the solvent level before the tlc plat eis placed into the devleioping hcambe
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what component in the solar cell provides electrons to replace the electrons released by the dye?
The component in the solar cell system which provides electrons to replace the electrons released by the dye simply is the graphite layer.
How the graphite layer release electrons to replace the dye electronsThe graphite layer is one of the major parts oth the solar cell. It help in the provision of electrons by acting as a counter electrode within the electrolyte. In order, this layer is part responsible for replacing electrons produced by dyes.
In conclusion, we can now confirm from all said and done from above that the solar cell too has a way of producing electrons.
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A student draws a diagram that describes how she thinks people see in the dark. Based on her drawing, she predicts that if people stay
in a totally dark room for a long time, eventually their eyes will adjust to the darkness and they will be able to see.
When she tries this experiment in a totally dark room, it turns out that her prediction was incorrect, and that she is unable to adjust to
the darkness. What should she do with her drawing?
Because her drawing does not accurately represent what really happens, she should make a new version of it that better predicts what she
actually experienced in the dark room.
Because her drawing was not useful in making an accurate prediction, she should discard it and not use drawings anymore to make
predictions.
Because her drawing represents how she thinks the world works, she should not change it but should be confident that she can use it to
make accurate predictions.
O
Because her drawing represents how she thinks the world works, she should use it to make other predictions and keep checking them until
one of them turns out to be correct
Answer:
A: Because her drawing does not accurately represent what really happens, she should make a new version of it that better predicts what she actually experienced in the dark room.
Which intermediate product does not
evolve into a gas?
A) NH₂OH(aq)
B) H₂CO3(aq)
C) H₂SO3(aq)
D) NaCl(aq)
Answer:C
Explanation:I got it correct not no genius though.
what is the name of the compound made of zinc ions, zn⁺², and fluoride ions, f⁻¹?
Zinc fluoride is the term given to the mixture of the ions zinc (zn+2) and fluoride (f1).
Is zinc reactive or stable?Reactivity, by a reaction with the carbon dioxide in the air. Zinc emits zinc oxide fumes as it burns in the air, which produces a vivid bluish-green flame. With acids, alkalis, and other non-metals, zinc interacts easily.
With what can zinc react?Under normal circumstances, zinc and air quickly react, gradually generating a dull, grey zinc oxide covering. Zinc also combines to halogens, oxygen, chalcogens, alkalis, acids, ammonia and ammonium salts, as well as less reactive metals. Zinc is an amphoteric metal because it may react with the both acids and alkalis.
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