Answer:
A Red Giant
Explanation:
When the inward gravitational forces are less than the outward radiation pressure forces, the star swells and cools, thus turning red. High mass stars become red supergiants, low mass stars become red giants. The forces become unbalanced when the hydrogen begins to run out.
Brainliest Please?
is the solution for mimo control design using the cyclic method explained in the lecture note isunique? why?
The mimo control design using the cyclic method is unique beacuse,
An algebraic framework is used to illustrate the design and implementation of cyclic control, which includes Iterative Learning and Repetitive Control, for linear MIMO systems. The algebraic framework is frequently utilised in the construction of Iterative Learning Control and is also well suited for Repetitive Control. By diagonalizing the system matrix, the algebraic framework enables illustrative analysis and direct pole placement design of CC for SISO systems. MIMO systems can also be handled using this framework. However, a straightforward application of SISO designs for MIMO systems is not recommended. In most cases, this strategy will not result in control variable decoupling. This study describes a decoupling cyclic MIMO control architecture. The design and execution are carried out using a linked biaxial material testing equipment.Hence above answer is a correct answer.
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calculating gas density what is the density of methane, ch4ch4 , in a vessel where the pressure is 910 torr torr and the temperature is 255 kk ? what is the density of methane, , in a vessel where the pressure is 910 and the temperature is 255 ? 16 g/lg/l 0.057 g/lg/l 0.92 g/lg/l 0.72 g/lg/l 697 g/lg/l
The density of methane gas at a pressure of 910 torrs and a temperature of 255K is equal to 0.92 g/L.
What is the ideal gas equation?The situation of quantity of gas is determined by its volume, pressure, and temperature. The ideal gas law can be demonstrated as the product of the volume and pressure is equal to the product of the gas constant and absolute temperature.
The mathematical representation for an ideal gas can be written as follows:
PV = nRT
PV = (m/M)× RT
(PM)/RT = m/V
D = PM/RT
Where n is the moles, T is the temperature, V is the volume, and R is the gas constant.
Given, the temperature of the gas, T = 255 K
The pressure of the argon gas, P = 910 torr = 1.19 atm
The molar mass of the methane gas, M = 16 g/mol
Substitute R, P, M, and T in the ideal gas equation, and we get:
The density of methane gas, D = PM/RT
D = 1.19 ×16/(0.082 × 255)
D = 0.92 g/L
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During lab, a student mixed 25 mL of 1.0 M H3PO4 with 75 mL of 1.0 M NaOH. Using the equation below, determine how many moles of reaction the student performed give your answer to 2 sigfigs. H3PO4 (aq) + 3 NaOH(aq) + Na3PO4 (aq) + 3 H20 (1) moles of reaction The intial temperature of both the acid and the base were 22.6 °C, but they rose to 28.2 °C during the reaction. If the calorimeter constant was 78.5J/°C, what was qrxn in J? Give your answer to 3 sigfigs, and watch your signs! Using your answers above, what was the reaction enthalpy, AHxn, in kJ per mol reaction? Give your answer to 2 sigfigs, and watch units! kJ/mol of reaction
3 moles of NaOH required to make 1 mole of Na3PO4 in the given reaction.
H3PO4(aq) + 3NaOH(aq) ⇄ Na3PO4 (aq) + 3H20
Quantifying the quantity of a material is made easier with the aid of the mole concept. It is understood that even a single gram of a pure element has a sizable number of atoms when dealing with particles at the atomic (or molecular) level. In this regard, the mole notion is frequently utilized. The "mole," which is a count of a large number of particles, is the most commonly used unit of measurement.
The letter "NA" is often used to indicate the value 6.02214076*10^23, commonly known as the Avogadro constant. Atoms, molecules, monoatomic and polyatomic ions, as well as other particles, are among the elementary things that may be represented in moles (such as electrons).
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Are amino acids equivalent to proteins?.
A protein is a chain of amino acids linked together by peptide bonds.
Protein is observed in the course of the body—in muscle, bone, skin, hair, and absolutely every different frame component or tissue. It makes up the enzymes that energy many chemical reactions and the hemoglobin that contains oxygen for your blood.
Proteins are big, complicated molecules that play many critical roles in the body. They do the maximum of the work in cells.
The constructing blocks of proteins are amino acids, which can be small natural molecules that encompass an alpha (critical) carbon atom linked to an amino organization, a carboxyl institution, a hydrogen atom, and a variable issue called an aspect chain.
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THE yellow,light given off by odium lamp ha awave length of 58. 9nm. What i frequency of thi radiation
The wavelength of yellow light is 580nm which is 580×10⁻⁹ m, so its frequency will be 5.17×10¹⁴ m/s.
The frequency and the wavelength are indirectly proportional to the each other. More is the wavelength, lesser is frequency and vice-versa. The speed at which a wave travels is equal to product of the frequency and wavelength, which justifies link between these two parameters.
V = λ f
where,
V is wave speed,
f is wave frequency,
λ is wavelength.
Given that,
Wavelength = 58.9nm
Speed of light= 3×10⁸ m/s
The frequency of yellow light will be
ν= c/λ
= 3.0×10⁸ m/s/ 580×10⁻⁹ m
=5.17×10¹⁴ m/s.
The wave number of yellow light,
νˉ = 1/λ
= 1/580×10⁻⁹ m
=1.72×10⁶/m.
So, the frequency of the sodium lamp will be 5.17×10¹⁴ m/s.
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When magnesium (mg2+) and fluorine (f1-) combine in an ionic bond, the resulting formula will be.
When Magnesium (Mg²⁺) and Fluorine (F¹⁻) combine in an ionic bond, the resulting formula will be magnesium fluoride (MgF₂).
Magnesium Fluoride (MgF₂) is formed when magnesium and fluorine react together. The reaction between the two elements is very exothermic and occurs in the solid state.
The reaction is as follows:
Mg (s) + F₂ (g) → MgF₂ (s).
The MgF₂ is a white solid that is insoluble in water. It is a wide band gap insulator with a dielectric constant of about 7.5 and a melting point of 1163°C.
Magnesium Fluoride is used in optical components, particularly as an antireflection coating on lenses, as well as in coatings for solar cells and LCDs. It is also used in the production of specialty ceramic materials.
Therefore, when Magnesium and fluorine combine, it forms Magnesium fluoride.
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a sealed gas, initially at 5.00 atm and 5.00 l, expands to a volume of 10.00 l. what is the new pressure of the gas, assuming constant temperature?
The new pressure of the gas, assuming constant temperature is 2.50atm.
What is atmospheric pressure?
When gas particles in the atmosphere of the Earth collide with other things, the pressure that results is known as atmospheric pressure. The tool used to gauge atmospheric pressure is called a barometer. An evacuated tube is inserted into a container of mercury to create a classic mercury barometer.
What is total pressure?
A mixture of gases' total pressure is equal to the sum of its constituent gases' partial pressures. We can formulate a formula for the total pressure of a combination of two ideal gases, A and B.
Given temperature constant so it is isothermal process.
Given Pressure (P1) = 5atm, P2=?
Volume (V1)= 5L, V2= 10L
We know for isothermal process P1V1= P2V2
==> 5×5 = P2× 10
==> P2 = 25/10= 2.50atm
So the correct answer is 2.50atm.
Therefore, new pressure of the gas, assuming constant temperature is 2.50atm.
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what are the main goals of this investigation? group of answer choices separation and identification of molecular compounds in an unknown solution separation and identification of negatively charged ions in solution separation and identification of ions in solution
A solution containing a mixture of metal ions can be separated by precipitation using anions like Cl, Br, SO₂,, CO₂,, S₂, Cr₂O₂, PO₂,, and OH, among others.
Precipitation can be used to distinguish certain metal ions from other metal ions when they combine to create insoluble salts with a certain anion. By precipitating the anions with the right metal ions, we may also separate the anions. Although the concentrations of their saturated solutions are tiny, medium, and high, there are no clear boundaries between insoluble salts, sparingly soluble salts, and soluble salts.
For insoluble and sparingly soluble salts, solubility products are typically included; however, they are not provided for soluble salts. For soluble salts, the solubility products are enormous.
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What is a pewter pitcher used for?.
These pewter pitchers work great while heated and used as wine decanters, iced tea snifters, and for serving iced water. Every pewter pitcher we sell is produced using same techniques.
They are food safe and free of lead, just like all of our pewter goods. Pewter is a malleable metal alloy that traditionally contains 85–99% tin with the other components being copper, antimony, bismuth, and occasionally, though less frequently now, lead. Heated is also utilized on occasion. The high copper content of this lead-free pewter alloy enables it to produce the finest detail in open face, gravity pour, sand, and cast iron moulids. Heated for good strength. Copper and antimony make up 91–93% of the tin. Around the start of the Bronze Age, the Near East saw the first usage of pewter.
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a student was synthesizing aspirin in the laboratory. using the amount of limiting reactant, she calculated the mass of aspirin that should form as 11.74 g. when she weighed her aspirin product on the balance, its mass was 2.63 g. calculate the percent yield for this synthesis.
If the student was synthesizing aspirin in the lab and she calculated the mass of aspirin that should form as 11.74 g and when she weighed her aspirin product on the balance which was 2.63 g. The percent yield can be 22.4 %.
The amount of a product received from a reaction is indicated by the percent yield.
The theoretical yield is given, which is 11.74 g and the actual yield is given which is 2.63 g.
Now, we use the formula of the percentage (%) yield,
percentage (%) yield = [tex](\frac{ Actual yield }{ Theoretical yield } )[/tex] × 100
% yield = [tex](\frac{2.63}{11.74})[/tex] × 100
% yield = 22.4 %
So, the percentage (%) yield is 22.4 %.
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Which statements describe organic compounds? Check all that apply. Organic compounds are commonly found in living things. Organic compounds are not associated with or made from living things. Organic compounds contain carbon. Organic compounds usually lack carbon. Organic compounds are found in food. and whoever could answer this correctly I'll give brainlist to thank you have a nice day
True statements regarding organic compounds are:
Organic compounds are commonly found in living things.Organic compounds contain carbon.Organic compounds are found in food.Organic compound comprises of a large class of chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen.
The basic characteristics of the organic compounds are given below.
Organic compounds contain at least one carbon atom.The carbon atom in the organic compounds form covalent bonds with other elements.Generally, organic compounds have carbon-hydrogen bonds.Organic compounds are found commonly in all living things.Learn more about organic compounds from the link given below.
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Experiment Reaction: An Aldol Reaction: trans-4-Nitrochalcone
Consider the product IR obtained in the lab and pictured below. Note that the sample is showing an unexpected band of OH (where? why?) but the relevant region is clear and accurate.
Identify and assign the carbonyl absorption band in your product spectrum: [ Select ] ["3361", "2360", "1656", "1607", "1513", "1333"] cm-1 [ Select ] ["stretch", "bend"] .
The acetophenone, which is the starting material, has an IR band assigned to its [ Select ] ["hydroxide", "carbonyl", "aromatic ring"] at 1681 cm-1. How this compare with the product carbonyl band that you found in this IR above? The carbonyl in your product is [ Select ] ["the same in cm-1", "at least 10 cm-1 higher", "at least 10 cm-1 lower"] from that of the acetophenone.
The reason for the difference in frequency value for the carbonyl, is that [ Select ] ["the double bond", "the OH", "the aldehyde"] creates an additional [ Select ] ["enolization", "conjugation", "localization"] which [ Select ] ["increases", "lowers"] the frequency of the C=O band.
The alpha, beta – unsaturated system in the final product results from the elimination of [ Select ] ["water", "nitro", "HCl"] in the last step of the reaction.
The carbonyl absorption band in your product spectrum is 1656 [tex]cm^{-1}[/tex].
How does aldol become made?A was the or enolate ion reacts with such a carbonyl chemical to create a -hydroxyaldehyde and -hydroxyketone, which itself is subsequently dehydrated to create a conjugated enone. This is an example of an endothermic reaction in organic chemistry.
What is a direct aldol reaction?The redirected aldol reaction is a kind of regular crossing aldol reaction. Using LDA, the enolate is made from one carbonyl molecule. The other carbonyl molecule is accordingly the electrophile. Even though there are alpha hydrogens for both locations, just one of the elements is an enolate because it is made with LDA.
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in order to prepare a 1:5,000 (w/v) solution from 20 ml of a 1:200 (w/v) solution, the pharmacist should add how many ml of diluent?
Add 0.1 liters of the stock solution to 19.9 liters of diluent (20 liters - 0.1 liters).(C1) (V1) is (C2) (V2) where C1 is the concentration of the beginning solution is the formula for determining a dilution.
How do you determine how much water you need to diluted a solution?(C1) (V1) = (C2) (V2) where C1 is the concentration of the beginning solution is the formula for determining a dilution.
The initial solution's volume is designated as V1.
The final solution's concentration is C2.
The final solution's volume is V2.
Implementing Dilution Factors
Example: Prepare a 1:200 dilution in 20 L.
Final Volume/Solute Volume = DF, according to the formula.
Enter these numbers: (20 L) / Solute Volume = 200.
Justify: Solute Volume = 20 / 200 = 0.1 l.
Add 0.1 liters of the stock solution to 19.9 liters of diluent (20 liters - 0.1 liters).
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what is true for ideal gases at stp conditions? select all that apply. select all that apply: the standard molar volume is 22.4l. all gases have the same mass. all gases have the same reactivity. one mole of any ideal gas has the same volume.
The statement which is true for ideal gases at stp conditions is: one mole of an ideal gas has a volume of 22.4L which is also known as standard molar volume.
What are ideal gases?
The term ideal gas refers to a virtual gas composed of molecules that obey some rules.
Ideal gas molecules do not attract or repel each other. The only interactions between ideal gas molecules are elastic collisions when they collide with each other or with the walls of the container.
Ideal gas molecules take up no volume by themselves. Gases occupy volume as their molecules expand into large regions of space, but ideal gas molecules are approximated as point particles that have no volume of their own.
What is the molar form of the ideal gas law?
Ideal gas pressure, P, volume V, and temperature T are related by a simple equation called the ideal gas law. The simplicity of this relationship is an important reason why we usually treat gas as ideal unless there is another reason.
PV=nRT
where, P is the pressure of the gas, V is the volume occupied by the gas, T is the temperature of the gas, R is the gas constant, and n is the number of moles of gas.
The statement which is true for ideal gases at stp conditions is: one mole of an ideal gas has a volume of 22.4L which is also known as standard molar volume.
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a 25 ml sample of h2so4 was titrated with 3.52 ml of a 1.2 m naoh solution according to the reaction below. what was the concentration of the h2so4 sample?
The concentration of the H₂SO₄ solution used for titration is 0.168M.
The chemical equation of the reaction of the H₂SO₄ and NaOH is,
H₂SO₄ + NaOH → Na₂SO₄ + H₂O
So, we can see, from the reaction.
One mole of H₂SO₄ reacts completely with one mole of NaOH.
We know,
Moles = Molarity x volume
Molarity of H₂SO₄ x Volume of H₂SO₄ = Molarity of NaOH x volume of NaOH
Putting values,
Molarity of H₂SO₄ x 25 = 1.2 x 3.52
Molarity of H₂SO₄ = 0.168M.
So, the concentration of the H₂SO₄ solution is 0.168M.
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what is the total number of valence electrons in the lewis structure of no2-? 18 electrons feedback area correct correct 2 question content area draw a lewis structure for no2-.
For the NO2⁻ Lewis structure, calculate the total number of valence electrons for the NO2⁻ molecule. After determining that how many valence electrons there are in the NO2⁻ , place them around the central atom to complete the octets of electrons.
There are a total of the 18 valence electrons for the Lewis structure for NO2⁻ .Nitrogen is the least electronegative atom in the NO2⁻ Lewis structure and therefore goes in the center of the structure of electrons.
In order to make sure that the outer shell of the Nitrogen (N) atom is full you will need to form a double bond with one of the Oxygen (O) atoms in the Lewis structure.
Also note that you should put the NO2⁻ Lewis structure in brackets with as 1⁻ on the outside to show that it is an ion with a negative one charge.
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What type of change happens when chocolate melts?.
The melting of chocolate is an example of a physical change. When chocolate melts the solid state converts to the liquid state where the molecules becomes distant apart.
What are physical changes?A physical change involves the change in state of matter or phase change. It does not involves any breaking or making of chemical bonds. The changes which involves any chemical bond breaking or making or both it is called any chemical change.
In solid state, molecules are closely packed and have no space in between to move apart. Therefore, they form definite shape and volume. When solids converts to liquid they are said to be melting and needs temperature.
In liquid state molecules have some space to move apart and thus they don't have definite shape. When chocolate melts to form molten state, they under high temperature their molecules get far apart and starts to flow.
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a molecule that does not have a dipole moment and in which the central atom is sp3 hybridized will have an electron-domain
The molecule that does not have a dipole moment and in which the central atom is sp3 hybridized will have an electron-domain are CH4 , SF4.
Now coming to the hybridization of methane, the vital atom carbon is sp3 hybridized. This is due to the fact one 2s orbital and 3 2p orbitals withinside the valence shell of carbon integrate to shape 4 sp3 hybrid orbitals which can be of same electricity and form
CH 4 and H 2 O each has sp 3 hybridisation however as there's no lone pair found in CH 4 while in H 2 O there are lone pairs found in water molecule. Therefore form of methane is tetrahedral while water molecule has bent form.
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HELP PLEASE i’m literally sleep deprived because of this
i think you’re suppose to talk about the equilibrium switching and favouring things
In addition to H²O equilibrium, the reaction will move forward direction.
Le Chatelier's precept, additionally known as Chatelier's principle, is a precept of chemistry used to predict the impact of exchange in conditions on chemical equilibrium
Le Châtelier's principle states that if a dynamic equilibrium is disturbed by changing the situations, the position of equilibrium shifts to counteract the alternate to reestablish equilibrium. Le Chatelier's precept may be stated as follows: A exchange in one of the variables that describe a machine at equilibrium produces a shift inside the function of the equilibrium that counteracts the effect of this change.
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Is melting chocolate in your hand conduction?.
Yes melting chocolate in hand is a process of conduction.
Conduction can be understood as the process, which usually enables direct transfer of heat through the matter, this happens due to the difference in temperature, between adjacent parts of the object. It happens when the temperature of the molecules present in a substance increase, resulting in vigorous vibration. The molecules collide with surrounding molecules, making them vibrate too, which results in the transportation of thermal energy to neighboring part of the object.
In simple terms, whenever two objects are in direct contact with one another, there will be a transfer of heat from the hotter object to the colder one, this happens due to conduction.
Chocolate candy in your hand will eventually melt as the heat from your body is released and makes the chocolate to be melted. This is due to conduction.
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What are the dangers of pewter?.
The dangers of pewter is when it can contains lead and and tin , then it is poisonous substance.
The old pewter contains a large amount of lead and tin and the tin is very harmful substance or it is poisonous substance. if we use the lead contain pewter on daily basis the the resulted in the chemical leaching out of the utensil will be absorbed by the human body which is very dangerous and may lead to the persons death. but now the pewters containing the lead is now no longer in use such as the jewelry's , cups, plates. so, now the pewter with no lead is not harmful for the human beings.
Thus the pewter containing lead is poisonous to the human life.
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the oxidation of propan-1-ol with acidified potassium dichromate with distillation will produce . the oxidation of propan-1-ol with acidified potassium dichromate heated under reflux will produce . enter the iupac name of the products in the boxes (not the formula or class name, e.g ethane and not c2h4 or 'alkene').
It is a tertiary alcohol, 2-methylhexan-2-ol. Furthermore, oxidation the reaction of and acid medium produces chromic acid via the following reaction:
Because chromic acid is a strong oxidant, an oxidation-reduction reaction will occur. However, in this case. We have secondary alcohol. Primary alcohols are converted to aldehydes, which are then converted to carboxylic acids. Secondary alcohols are oxidized to ketones, whereas tertiary alcohols are not oxidized due to a lack of hydrogens on the carbon bonded to the "OH" group.
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Nitric acid (HNO3) is a component of acid rain that forms when gaseous nitrogen monoxide pollutant reacts with gaseous ozone (O3) and liquid water to form aqueous nitric acid. Enter a balanced chemical equation for this reaction. Express your answer as a chemical equation. Identify all of the phases in your answer.
Nitric acid would be the end product of this reaction, which uses nitrogen dioxide, oxygen, and water as reactants.
How nitric acid is formed in acid rain equation?For this reaction, the reactants are nitrogen dioxide, oxygen and water while the product would be nitric acid. The chemical equation would be written as:
NO2(g) + O2(g) + H2O(l) --> HNO3(aq)
This can be a complete equation when the elements are balanced in each side.
4NO2(g) + O2(g) + 2H2O(l) --> 4HNO3(aq)
Therefore, when Nitric acid is a component of acid rain that forms when gaseous Nitrogen dioxide pollutants react with gaseous Oxygen and liquid water to form aqueous Nitric acid as 4 N O 2 ( g ) Nitrogen dioxide + O 2 ( g ) Oxygen + 2 H 2 O ( l ) Water → 4 HN O 3 ( aq ) Nitric acid .
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The osmotic pressure of a solution formed by dissolving 25.0 mg of aspirin (c9h8o4) in 0.250 l of water at 25°c is ________ atm.
The osmotic pressure of an aspirin solution formed by dissolving 25.0 mg of aspirin (C₉H₈O₄) in 0.250 l of water at 25°C is
The osmotic pressure is calculated as
π=i×M×R×T (i)
Where, i-van't hoff factor
M-Molarity
R=0.08206 Latm/molK
T=25°C
=25+273=298K
For a molecule C₉H₈O₄, the value of i is 1 as it is a non-electrolyte. We need to find out the molarity of the solution which is
Molarity=moles/volume in L
First calculate moles of C₉H₈O₄. The molar mass of C₉H₈O₄ is
Molar mass = [(9×12)+(8×1)+(4×16)] g/mol
=(108+8+64) g/mol
=176 g/mol
moles=25.0 mg×(1 g/1000 mg)×(1 mol/176 g)
moles=(25.0 mol/176×1000)
moles=(25.0 mol/176000)
moles=0.0001420 mol
The molarity of a solution is
Molarity(M)=0.0001420 mol/0.250 L
=0.000568 mol/L
Plug all values in equation (i)
π=1×(0.000568 mol/L)×(0.08206 Latm/molK)×298K
π=0.01389 atm
π=0.0139 atm
Therefore, the osmotic pressure of an aspirin solution is 0.0139 atm.
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predict the products (if any) that will be formed by the reaction below. if no reaction occurs, write nr after the reaction arrow. be sure to include the proper phases for all species within the reaction.
The product is [tex]ZnSO[/tex]₄[tex](aq)[/tex] [tex]+ Fe(s)[/tex] and this is in aqueous form which is formed by the reaction [tex]FeSO[/tex]₄ [tex](aq) + Zn(s)[/tex] .
How does the reaction takes place?The reaction given in the question is,
[tex]FeSO[/tex]₄ [tex](aq) + Zn(s)[/tex]
When this net ionic reaction takes place completely it gives a product as
[tex]FeSO[/tex]₄ [tex](aq) + Zn(s)[/tex] ⇒ [tex]ZnSO[/tex]₄[tex](aq)[/tex] [tex]+ Fe(s)[/tex]
Where,
[tex]FeSO[/tex]₄ is Ferrous sulfate that is hydrous
[tex]Zn[/tex] is zinc that is solid
[tex]ZnSO[/tex]₄ is Zinc sulfate that is hydrous
[tex]Fe[/tex] is Iron or Ferrous that is solid
Here,
[tex]Zn[/tex] gets oxidized and [tex]Fe[/tex] gets reduced.
The reduction and oxidation reactions are follows :
Reduction reaction is ,
[tex]Fe[/tex] ² +2e ⟶[tex]Fe[/tex] ⁰
Oxidation reaction is ,
[tex]Zn[/tex] − 2e⁻ ⟶[tex]Zn[/tex] ²
What is Net Ionic equation?A net ionic equation is a chemical equation of a reaction that lists only the species involved in the reaction. The net ionic equation is commonly used in acid-base neutralization reactions, double displacement reactions, and redox reactions.
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Arrange the following compounds in increasing order of their acid strength: Propan-1-ol, 2, 3, 6 - trinitrophenol, 3-nitrophenol, 3. 5-dinitrophenol, phenol, 4-methyl phenol.
Propan-1-ol, 4-methylphenol, 3-nitrophenol, phenol, 3, 5-dinitrophenol, and 2, 3, and 6-trinitrophenol are listed in increasing order of acid strength.
Which has the most acidity?What acid has the most strength? Fluoroantimonic acid is actually a blend of hydrofluoric acid and pentafluoride antimony, making carborane superacids the strongest solar acids in the world. The pH level of carborane is -18.
Which of the following acids has the greatest Mcq value for acidity?Acid o-nitrobenzoic ,Nitrophenol and m-nitrobenzoic acid are two related compounds. Solution: O-nitrobenzoic acid has the highest acid strength due to the nature of the -'NO (2)' group, which withdraws electrons, and the "ortho effect."
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What is unique to group 18 nonmetals?.
Noble gases are a subset of nonmetals in group 18 that are frequently referred to as chemically inert because of their lack of color, odor, and high degree of reactivity. Helium, neon, argon, krypton, xenon, radon, and the man-made element oganesson are all members of this category.
What are noble gases ?The noble gases are a group of chemical elements that share several characteristics. They are all monatomic, odorless, and colorless gases with relatively little chemical reactivity under normal conditions. Helium, neon, argon, krypton, xenon, and radioactive radon are the six types of noble gases that are found in nature.
In order of mass, the noble gases are helium, argon, krypton, xenon, and radon. They are known as noble gases because of how beautiful they are and how little they generally react with anything. For this reason, they are often referred to as inert gases.
Thus, noble gases have a stable configuration . Group 18 elements don't form many compounds, since they are gaseous and chemically inert.
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How is climate change affecting the Northern Hemisphere?.
Identify ways in which polysaccharides are covalently attached at their reducing ends to glycoproteins and draw chemical stucures representative of these sugar-protein linkages.
Some types of polysaccharides include starch, cellulose, and glycogen.Polysaccharides are stabilizers and dietary fiber added to foods in the food business.
How do you identify a polysaccharide?One or more covalently linked GAG chains are connected to the core protein of proteoglycans .An amino sugar (either GlcNAc or GalNAc) and a uronic acid make up the linear polysaccharides known as GAGs (GlcA and IdoA).Almost every mammalian cell makes proteoglycans, which are then either secreted into the ECM, inserted into the plasma membrane, or stored in secretory granules.The matrix proteoglycans consist of type IX collagen in proteoglycan form, one or more members of the aggrecan family of proteoglycans, tiny interstitial proteoglycans (decorin, biglycan, and fibromodulin), and others (aggrecan, brevican, neurocan, or versican).These proteoglycans range in size from those with just one GAG chain (such as decorin) to those with more than 100 chains (e.g., aggrecan).GAGs are frequently found in the matrix proteoglycans.To learn more about polysaccharides refer
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a chemist adds of a barium chloride solution to a reaction flask. calculate the millimoles of barium chloride the chemist has added to the flask. be sure your answer has the correct number of significant digits.
The millimoles of barium chloride the chemist has added to the flask will be 2.6 x 10² mmol.
Volume of barium chloride (BaCl₂) = 425.0 ml
Molarity of BaCl₂ = 0.62 M
Number of mmol = ?
Calculate the number of mmol by using the following formula:
Molarity = moles (solute) / Volume (solution) in liter
As we have to find the number of mmol so rearrange the equation for mmol.
millimoles (solute) = Molarity x Volume (solution) in mL
millimoles of BaCl₂ = Molarity of BaCl₂ x Volume (solution) in mL
Put the values in the above equation.
mmol of BaCl₂ = 0.62 M x 425.0 mL
mmol of BaCl₂ = 0.62 mol/L x 425.0 mL
mmol of BaCl₂ = 263.5 mmol
mmol of BaCl₂ = 2.6 x 10² mmol
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