Hydrogen gas escape from the chamber containing magnesium.
What happen when we burn magnesium in air ?Magnesium burns in the air and forms magnesium oxide, which is a powdery white substance that emits heat and light, as a result of a reaction with oxygen in the air.
When the magnesium ribbon is burned, it enters the gas jar containing the carbon dioxide and continues to burn. In this process, the carbon dioxide's oxygen atoms join with those of magnesium to form magnesium oxide, which results in the formation of black soot from the carbon and the release of further energy.
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How many atoms are in 4 moles of CH4?
5 atoms are present in 4 moles of methane (CH₄).
Atoms are the smallest unit in which matter can be divided without the release of electrically charged particles. It is also the smallest unit of matter that has the characteristic properties of a chemical element.
Methane is a chemical compound having chemical formula CH₄ (one carbon atom is bonded to the four hydrogen atoms). It is a group-14 hydride, the simplest alkane, and the main constituent of a natural gas.
One molecule of the methane having 5 atoms
So 1 mole of methane will have = 5 × 6.022 × 10²³ atoms.
Therefore, 4 moles of methane will have = 4 × 5 × 6.022 × 10²³ atoms.
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Help please !!!! I’ll give brainliest !!!!
Answer:
2x+nm^3
Explanation:
For each solution, calculate the initial and final pH after adding
0.010 mol of HCI.
a. 500.0 mL of pure water
b. 500.0 mL of a buffer solution that is 0.125 M in HC2H3O2 and 0.115 M in NaC2H302
c. 500.0 mL of a buffer solution that is 0.155 M in C2H5NH2 and 0.145 M in C2H5NH3Cl
The initial and final pH after adding 0.010 mol of HCI.
a. Initial pH = 7.00; Final pH = 2.30
b. Initial pH: 4.75; Final pH: 4.26
c. Initial pH: 9.45; Final pH: 8.98
What is initial pH and final pH?Initial pH is the starting pH of a solution before any reaction has taken place. Final pH is the ending pH of a solution after a reaction has occurred. The pH of a solution can be determined using a pH meter or litmus paper.
a. The addition of 0.010 moles of HCl will reduce the pH of the pure water from 7.00 to 2.30.
b. The addition of 0.010 moles of HCl will reduce the pH of the buffer solution from 4.75 to 4.26. This is due to the buffering effect of the HC2H3O2 and NaC2H3O2, which will react with the HCl to prevent the pH from dropping too much.
c. The addition of 0.010 moles of HCl will reduce the pH of the buffer solution from 9.45 to 8.98. This is due to the buffering effect of the C2H5NH2 and C2H5NH3Cl, which will react with the HCl to prevent the pH from dropping too much.
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1. what do you think the chrysanthemums might symbolize? support your conclusions with examples from the text.
The "The Chrysanthemums" is a short story by John Steinbeck. The symbolism of the chrysanthemums in the story is open to interpretation, but they are often seen as representing the protagonist Elisa's repressed sexuality and desire for a fulfilling life.
In the story, Elisa is described as a passionate gardener who takes great care in growing her chrysanthemums, but her efforts are often overlooked and underappreciated by her husband and the society in which she lives. The chrysanthemums represent Elisa's own life, as she feels trapped and unfulfilled in her domestic role.
For example, when Elisa shows her chrysanthemums to a tinker, she says, "I wish you could take them away with you. I wish I could do something for you, something important. These flowers aren't enough." This statement underscores the sense of frustration and unfulfillment that Elisa feels, as her nurturing of the chrysanthemums is a symbol of her own unrealized potential.
Overall, the chrysanthemums in "The Chrysanthemums" can be seen as a symbol of Elisa's unfulfilled desires and the frustration she feels with her limited role in society, as well as a manifestation of her inner strength and resilience.
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How many atoms of hydrogen are in 1.00 mole of water?
In one mole of water there are considered to be two moles of hydrogen because there are two atoms of hydrogen present in the water molecule H₂O.
As it is known that one mole of water contains 6.022 X 10²³ molecules. Each H₂O molecule has two atoms h hydrogen and one atom of oxygen. Therefore, in one mole of water, there are two moles of hydrogen and one mole of oxygen atom.
All this is explained under the concept of mole and molar mass.
The mole concept is a method for determining the mass of chemical substances based on their requirements, and the entire mole concept revolves around 12 grams of the carbon isotope 12C. The mass of one atom of carbon-12 element was determined to be 1.99 X 1023 g using a mass spectrometer. Because one mole of Carbon-12 atom weighs 12g, the number of atoms in it is equal to :
12g/mol / 1.99 X 10²³ g/atom = 6.022 X 10²³ atoms/mol.
This is commonly referred to as Avogadro's Number.
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In a race, you run 3000 meters east in 12 seconds. What is your velocity?
Answer:
250m/s
Explanation:
velocity formula is distance (m) over time(s)
3000 / 12 = 250
Answer: Your answer is 250m/s
Explanation: V= d/t
V= velocity
d= distance
t= time
So, 3000 meters divided by 12 seconds = 250 meters per second
Select how benzophenone and benzaldehyde can be distinguished using IR only. Only one compound will show absorption at 1720 cm−1. Only one compound will show absorptions at 1600 and 1650 cm−1. Only one compound will show absorption at 1865 cm−1. Only one compound will show absorptions at 2820 and 2720 cm−1
Benzophenone will show absorption at 1720 cm-1, while benzaldehyde will show absorptions at 1600 and 1650 cm-1. Additionally, benzophenone will show absorption at 1865 cm1 and benzaldehyde will show absorptions at 2820 and 2720 cm1.
These absorption peaks can be used to distinguish between the two compounds using IR spectroscopy.
Benzophenone has a carbonyl group and shows an absorption peak at 1720 cm1, which corresponds to the C=O stretching frequency. Benzaldehyde has an aldehyde group and shows absorption peaks at 1600 and 1650 cm-1, which correspond to the C=C stretching frequency and the C-H bending frequency, respectively.
Additionally, benzophenone has a phenyl ring, which gives a peak at 1865 cm1, and benzaldehyde has a C-H stretching, giving peaks at 2820 and 2720 cm1.
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4.the hot vapor coming from the distilling flask is cooled by cold water circulating in the condenser. where does the cool water enter? why? (3 pts)
The cool water typically enters the condenser through an inlet at the bottom or side of the device. The water is then circulated through the condenser using a pump, and exits the condenser through an outlet at the top or side.
The purpose of the cool water is to condense the hot vapor coming from the distilling flask by providing a cool surface for the vapor to come into contact with. As the vapor cools and condenses, it turns back into a liquid, which can then be collected for further use or analysis. By using cool water to condense the vapor, the process can be made more efficient, and the temperature of the distillate can be controlled. Additionally, by controlling the temperature of the condenser, it is possible to selectively separate certain components of the mixture being distilled, based on their relative boiling points.
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select the steps that are associated with energy entering the system.
They include the folowing;
1. The break-up of firm particles = Endothermic heat absorbing process
2. The break-up of solute fragments = Endothermic heat arresting process
3. The joining of solute and solvent particles = Exothermic heat bearing process
The Enthalpy of Resolution maybe found in this manner including three elements: ΔHsoln = ΔH1 + ΔH2+ ΔH3
1. Break-up of the solute molecules from each one (extending the solute), this is an endothermic response. (ΔH1)
2. Break-up of the financially sound molecules from each one (extending the solid fragments), this is also an endothermic backlash (ΔH2)
In their divided states, the solute and fit fragments are free to attract each one liquid.
3. The exothermic response of the solute and fit resulting in the composition of the resolution. (ΔH3)
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please help me with this!!
i didn’t know what subject to put.
The density of gas is material f
How do you find the density of a gas?The density of the gas is equal to its mass divided by the volume. You can calculate the molar mass of the substance once the density of the gas is known. The Density varies with temperature and pressure.PV = gRT/M, where P = pressure, V= volume, T = temperature, g = weight of the gas R = the ideal gas constant. This equation may be rearranged to give the density of the gas : r = g/V = PM/RT.For a static gas, the molecules are in a completely random motion. Because there are so many molecules, and the motion of each molecule is random, the value of the density is the same throughout the container.
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to build a single bond in a ball-and-stick model, you need to use
To build a single bond in a ball-and-stick model, you need to use a single line or bond to connect the atoms in a ball-and-stick model.
In a ball-and-stick model, atoms are represented by small spheres or balls, and chemical bonds are represented by lines or sticks connecting the balls. A single bond is a chemical bond in which two atoms share one pair of electrons. In a ball-and-stick model, a single bond is represented by a single line connecting the two atoms. This is different from a double bond, which is represented by two lines connecting the atoms and a triple bond, which is represented by three lines connecting the atoms.
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the basic first aid procedure for any chemical splash includes washing the affected area for at least
The basic first aid procedure for any chemical splash includes washing the affected area for at least 20 minutes with water
If a person experiences a chemical splash the first step in providing first aid is to remove any contaminated clothing and wash the affected area thoroughly with water for at least 20 minutes. This will help to remove as much of the chemical as possible and prevent further chemical absorption through the skin. If the chemical is a strong acid or base, it's recommended to neutralize the chemical by rinsing with a solution of baking soda or vinegar.
It is also important to seek medical attention immediately after washing the affected area. If the chemical has caused damage to the eyes, the person should be transported to a hospital as soon as possible. If the person has inhaled fumes, they should be moved to a location with fresh air and seek medical attention if they have any difficulty breathing.
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What property of water allows it to be such a versatile solvent that is often called the universal solvent?
Answer:
Polarity
Explanation: Because of its polarity and ability to form hydrogen bonds, water makes an excellent solvent, meaning that it can dissolve many different kinds of molecules.
Where does the residual solvent peak for cdcl3 appear on 1h nmr?
This is equivalent to CHCl3 in the chloroform solvent (CDCl3), and a singlet signal is seen at 7.26 ppm. This is CHD2OD for the methanol solvent, and at 3.31 ppm a 1:2:3:2:1 pentet signal is seen.
What makes chloroform a good solvent?Chloroform is a solvent, or a chemical that aids in the dissolution of other compounds. It is also employed in the manufacture of pesticides and films, as well as in the construction, paper, and board industries. For lacquers, floor polishes, resins, adhesives, alkaloids, fats, oils, and rubber, it serves as a solvent.
Chloroform danger levels:It can harm the nervous system, the liver, the kidneys, the eyes, the skin, and the skin. Chloroform may be hazardous if inhaled or consumed. The exposure to chloroform itself has been connected to cancer. There is a chance that workers will be exposed.
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How many moles Ba(NO3)2 are there in 15.4 g of Ba(NO3)2 ?
a 1.182 g sample contains only vitamin c (c6h8o6) and sucralose (c12h19cl3o8). when the sample is dissolved in water to a total volume of 34.3 ml, the osmotic pressure of the solution is 3.92 atm at 301 k. what is the mass percent of vitamin c and sucralose in the sample?
The mass percent of vitamin c is 39.34 % and sucralose is 60.66 % in the sample.
Π = iMRT (Osmotic pressure)
i = 1 (van't Hoff factor)
M = moles/ volume
Now,
ππ= inVRT ----> (1)
R = 0.0821 L.atmK-1mol-1
T = 301K
Volume is equal to 34.3 mL in liters it is equal to 0.0343 L
Now, from equation (1)
n = (π × .0343 L) / (1× 0.0821 L.atmK-1mol-1 × 301 K)
Mole = 0.00436 moles
Considering that sucralose has a mass of Y g and vitamin C has a mass of X g and given the number of samples,
e = 1.182 g
X + Y = 1.182 g
Y = 1.182 g - X ----> (2)
Since sucralose has a molecular weight of 398 g/mol and vitamin C (VC) has a molecular mass of 176 g/mol. Therefore, the total number of moles is equal to the sum of the moles of VC and sucralose.
0.00436 moles = X/176 + (1.149 - X)/398 70048(0.00436) = 398 X + 176(1.149 - X)
222 X = 103.18528
X = 0.465 gram
Now from eq ( 2) ;
Y = 1.182g - 0465 g
Y = 0.717 gram
so Vitamin C Mass Percentage = 0.465g × 100 / 1.182g
= 39.34 %
Mass percentage of sucralose = 0.717g ×100 / 1.182g
= 60.66 %
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Which graph best represents the relationship between mass and volume of a material that has a density of 5 grams per cubic centimeter?
Option 1 is correct answer.
What is density of cubic centimeter?Density is the mass of an object divided by its volume. Density often has units of grams per cubic centimeter (g/cm3). Remember, grams is a mass and cubic centimeters is a volume (the same volume as 1 milliliter). from geoinformatics.the quantity of something per unit volume, unit area, or unit length: as. : the mass of a substance per unit volume. density expressed in grams per cubic centimeter.Density is a measure of how heavy something is compared to its size. If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float. Density is a characteristic property of a substance and doesn't depend on the amount of substance.Density is a measurement that compares the amount of matter an object has to its volume. An object with much matter in a certain volume has a high density. In this article, we will learn about the definition of density and the units of density.To learn more about density refers to;
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According to the video, why should a used chemical container never be refilled?
According to the video, refilling a used chemical container should never be done because it could lead to contamination and possible safety hazards.
What is contamination?
Contamination is the presence of an ingredient, impurity or other undesirable element that spoils, corrupts, infects, renders unsuitable or inferior a material, physical body, natural environment, workplace, etc.
In chemistry, the term "contamination" typically refers to a single component, but in some specialised fields, it can also refer to chemical mixtures, even down to the level of cellular materials. There are impurities in all chemicals to some extent. If the impure chemical produces additional chemical reactions when combined with other chemicals or mixtures, contamination may be detected or not and may become a problem.
The term "contaminant" may be changed to "reactant" or "catalyst" in cases where the chemical reactions brought on by the presence of an impurity are advantageous. Depending on the type of molecule involved, additional terms like "toxin," "poison," or "pollutant" are frequently used if the additional reactions are harmful.
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Match each term to its definition. Tiles respiration photosynthesis electrochemical reaction combustion Pairs a reaction that releases energy in the form of an electric current arrowBoth a reaction that uses oxygen and releases heat and light energy arrowBoth a reaction in which plants absorb energy from the Sun arrowBoth a reaction carried out by cells that use oxygen and release energy arrowBoth
Both a reaction that uses oxygen and releases heat and light energy is respiration. Both a reaction in which plants absorb energy from the Sun is photosynthesis. Both a reaction carried out by cells that use oxygen and release energy is combustion reaction.
What is an respiration ?Respiration: glucose + oxygen → carbon dioxide + water + energy
The cellular respiration process produces ATP with the breakdown of the glucose and oxygen. During the process of respiration , carbon dioxide is formed along with water and energy.
Photosynthesis : water + carbon dioxide + sunlight → oxygen + glucose
Plants uses the light energy from the sun in the presence of water and carbon dioxide and forms food by the process of photosynthesis. It forms glucose and oxygen.
Combustion reaction: methane + oxygen → water + carbon dioxide + heat
Combustion reaction is a chemical reaction in which methane is the main substance. Combustion takes place as things burn in the presence of methane and oxygen to produce carbon dioxide, water and heat.
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Are minerals an inorganic substance?
An inorganic, naturally occurring, homogenous solid having a specific chemical makeup and organised (crystalline) atomic structures is referred to as a mineral.
Neither organic life nor the goods made from or by organic life are included in the term "inorganic."
Natural Formation: A mineral must develop naturally; it cannot be fabricated, manufactured, or produced in a laboratory.
A mineral must be chemically and physically uniform at the atomic level to be considered a homogeneous solid.
Due to the mineral's uniformity, its physical characteristics—such as hardness, density, and streak—are entirely predictable.
When a mineral has a defined chemical composition, all of its occurrences fall within a narrow range of chemical composition variations and the atoms that make up the mineral must exist in a predetermined arrangement.atomic structure with order
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which correctly compares how adding energy affects a substance during a phase change?
A) Particles overcome forces of attraction and the temperature rises
B) Particles overcome forces of attraction and the temperature stays the same
The statement that correctly compares how adding energy affects a substance during a phase change is as follows: Particles overcome forces of attraction and the temperature rises (option A).
What is phase change?Phase change is a physical process in which a substance goes from one phase to another.
The change usually occurs when adding or removing heat at a particular temperature, known as the melting point or the boiling point of the substance.
This means that when energy is added to a substance (melting), the temperature rises and the particles overcome forces of attraction.
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How many moles of water are produced by the combustion of 2.00 mol of methane?
Two moles of water are produced by the combustion of 2.00 mol of methane.
The combustion of methane means that it's possible to burn it. Chemically, this combustion process consists of a response between methane and oxygen in the air. When this response takes place, the result is CO2, H2O, and a great deal of energy. The following response represents the combustion of methaneCH4+ 2 O2-> CO2+ 2 H2O+ energy. One patch of methane, combined with two oxygen moles, reply to form a carbon dioxide patch, and two water moles generally given off as brume or water vapor during the response and energy.
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I NEED HELP!
Can you dissolve .35 moles of Potassium Permanganate (KMnO4 ) into 500 mL of water? _________ Why? / Why not? (please show work)
When the number of moles is less than 0.35 Therefore, KMnO4 will not dissolve because the number of moles is less than 0.35 mol.
What is mole ?One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.
The mole concept can be used to convert between mass and number of particles.
When we know that the solubility of KMnO4 is 6.4 g/100mL
Therefore, 6.49 g → solve in 100mL
? ← solve in 500mL
The amount of KMO4 soluble in 500mL
= (500X 6.49) /100
= 32.45 g
The molar mass of the KMnO4 = 158/mol
we can get the number of moles of KMnO4 = mass of KMnO4 / molar mass of KMnO4
number of moles of KMnO4 = 32.45 / 158
= 0.2 mol
Thus, When the number of moles is less than 0.35 Therefore, KMnO4 will not dissolve because the number of moles is less than 0.35 mol.
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CH3CH2OH can interact with other like molecules through ________
A. Only dispersion forces
B. Only dispersion forces and dipole-dipole
C. Dispersion forces, dipole-dipole, and hydrogen bonds
CH3CH2OH can interact with other like molecules through, the correct option is (C). Dispersion forces, dipole-dipole, and hydrogen bonds
Dispersion forces, also known as London forces, are the weakest type of intermolecular force and are present in all molecules. They are caused by the temporary fluctuations of electron density in a molecule, which creates a temporary dipole. These temporary dipoles can interact with other temporary dipoles in nearby molecules, resulting in dispersion forces. Dipole-dipole interactions are a type of intermolecular force that occur between polar molecules. A polar molecule has a permanent dipole, or separation of charge, due to the unequal distribution of electrons. Dipole-dipole interactions occur when the positive end of one polar molecule interacts with the negative end of another polar molecule. CH3CH2OH is a polar molecule because of the presence of an oxygen atom which has a higher electronegativity than carbon and hydrogen atoms, so it can interact with other polar molecules through dipole-dipole interactions.
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What do you mean by 1 atom?
An atom is the smallest unit of matter that retains the properties of an element. Atoms are composed of three parts: protons, neutrons, and electrons.
Protons and neutrons form the nucleus of an atom, while electrons orbit the nucleus in a cloud-like pattern. Atoms are not visible to the eye and are instead measured in nanometers (1 nanometer = 0.000000001 meters).
Atoms are the building blocks of all elements and form all types of molecules, which are the building blocks of matter. Atoms are also the smallest components of matter that can be isolated and identified.
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How many hydrogen atoms are in 1.4 moles of methane?
Each methane molecule contains 4 hydrogen atoms. Our total number of hydrogen atoms is 1.4*4 = 5.6 moles.
The term "mole" refers to the unit used to measure drug amounts. It is the mass of a substance with the same number of elementary particles as there are atoms in a gram of carbon-12 (12 g). Atoms, molecules, or formula units are examples of these basic building blocks.
has one carbon atom and four hydrogen atoms. Both hydrogen and carbon are nonmetals. Hydrogen only has one valence electron, whereas carbon has four. In CH4, there are four covalent connections between the carbon and hydrogen atoms because one carbon atom shares four of its electrons with four hydrogen atoms.
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How many moles of carbon are in 1 mole of ch4?
The number of the moles of the carbon in the 1 mole of the methane , CH₄ is 1 mol.
Given that :
The number of the moles of the CH₄ = 1 mole.
The name for the chemical compound CH₄ is the methane,. The methane contains the 1 carbon atom and the 2 hydrogen atoms.
The number of the moles of the carbon atom present in 1 mole of the CH₄ is given as follows :
Number of the moles of the carbon atom = 1 × 1
Therefore, Number of the moles of the carbon atom = 1 mol.
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consider the molecule ax3. what is the molecular geometry around the central atom? assume there are two lone pairs on the central atom.
The molecular geometry of the [tex]ax^{3}[/tex] molecule is trigonal planar. This is represented in the VSEPR model.
The molecular geometry can be represented by the VSEPR model. This model can predict the structure of nearly any molecule or polyatomic ion in which the central atom. VSEPR model predicts the geometry of the polyatomic molecules and ions. It focuses only on the number of electron pairs around the central atom, The [tex]ax^{3}[/tex] molecule is made up of 3 equally spaced sp2 hybrid orbitals arranged at the angle of 120 degree. The shape of this orbitals is planar triangular. There is an atom at the end of each orbital. The shape of the molecule is planar triangular.
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What volume of CO2 gas is produced from the reaction of 22.4 l of CH4?
The volume of CO₂ gas is produced from the reaction of 22.4 l of CH₄ is 11.1 L.
The reaction is given as :
CH₄ + 2O₂ ----> CO₂ + 2H₂O
The volume of the CH₄ = 22.4 L
The volume of the O₂ = 22.4 L
The moles of the CH₄ = 22.4 / 22.4
= 1 mol
The moles of the O₂ = 22.4 / 2 × 22.4
= 0.5 mol
Thus ,O₂ is the limiting reactant.
Therefore, the volume of the CO₂ = 0.5 × 22.4
= 11.1 L
Thus, the volume of the CO₂ gas produced is 11.1 L.
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What is the most important industrial acid in the world?
The most important industrial acid in the world is Sulfuric acid.
Sulfuric acid would be the most significant industrial chemical on the planet! We manufacture approximately 50 million tones per year in North America, primarily by burning sulfur to make sulfur dioxide, which is subsequently reacted using water.
Hydrochloric acid, phosphoric acid, nitric acid, sulfuric acid, as well as acetic acid were the five most frequent acids used during industry.
Sulfuric acid, maybe the most dangerous chemical inside the workplace, would be a vital component in the production of many of these fertilizers, batteries, acids, as well as metals. Because of its very corrosive nature, it is exceedingly harmful in its most typical concentrations.
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