In order for electrolysis to take place, a salt such as Na2SO4 is required. It makes available the ions Na+ and SO42, both of which are drawn to the electrodes in the solution and move toward them as a result. They do not experience a discharge when brought close to the electrodes. However, they are able to cancel out the electric charges carried by the ions that are formed as a result of the destruction of water by these electrodes. Let's check out what's happening at each of the electrodes.
At the cathode, often known as the negative pole, water breaks down in the following manner:
2H2O+2e−⟶H2+2OH−.This is only conceivable if some positive ions are available near the cathode to compensate for the negative charges emerging in the solution with these freshly produced OH ions. The only way this can happen is if there are some positive ions available near the cathode. In the absence of positive ions, such as Na+, in the vicinity of the cathode, the newly formed OH ions would function as a barrier to subsequent electrons coming from the external circuit, preventing those electrons from reaching the electrode and preventing the electrode from interacting with water. The electrolysis would come to a halt as a result.
At the anode, often known as the positive pole, the following reactions take place in water:
4H2O⟶O2+4H++4e− .This is only conceivable if there are negative ions coming near the anode to compensate for the positive charges that are forming in the solution as a result of these freshly produced H+ ions. A positively charged solution would result if the solution near the anode did not include any negative ions, such as SO42. Instead, the solution would contain the new H+ ions. This would stop any further electrons from being released from the water as a result. The electrolysis would come to a halt as a result.
The process culminates in a transformation of the solution's chemical makeup near the electrodes. When you go closer to the cathode, you'll notice that the solution has a higher concentration of NaOH. In the vicinity of the anode, the solution includes an increasing amount of H2SO4. Naturally, if you agitate and combine solutions that are anodic and cathodic, the acid and the base will neutralize each other, which will result in the solution being regenerated to contain the initial salt.
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At 100°C, 0.1mole of N2O4 is heated in a one dm3 flask. At equilibrium concentration of NO2 was found to be 0.12 moles. Calculate Kc for the reaction.
A. 0.12
B. 0.36
C. 0.21
D. 0.012
E. 0.02
Hydrobromic acid and lithium hydroxide are mixed in solution. Indicate the net ionic equation. Is k>1, <1 or ~1?.
The net ionic equation is OH⁻(aq) + H⁺(aq) H₂O(l) and k ~1.
What is an ionic equation?A molecular equation is an equation in which the formula of a compound is written as if all substances exist as molecules. An ionic equation is an equation in which dissolved ionic compounds are represented as free ions.
Consider the molecular equation that occurs when an aqueous solution of lithium hydroxide and hydrobromic acid undergo a neutralization reaction.
LiOH(aq) + HBr(aq) ⇒ LiBr(aq) + H₂O(l)
The complete ionic equation includes all ions and species.
Li⁺(aq) + OH⁻(aq) + H⁺(aq) + Br⁻(aq) ⇒ Li⁺(aq) + Br⁻(aq) + H2O(l)
Only ions in the net ion equation It is included. Participate in reactions and molecular species.
OH⁻(aq) + H⁺(aq) H₂O(l)
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How are hydrogens removed from polyprotic acids? how does this relate to the ka of these same species?.
Many acid contain two or more ionizable hydrogen. There are two in carbonic acid H₂CO₃ and three in phosphoric acid H₃PO₄. For any such multiple hydrogen acid the first hydrogen is easily removed and the last hydrogen is removed with great difficulty.
Define polyprotic acids.Polyprotic Acid is a chemical that can donate more than one proton. Diprotic and Triprotic are two distinct varieties of polyprotic acid that can, respectively, donate two and three protons.
Depending on how frequently dissociation takes place, polyprotic acids have a variety of dissociation constants, including Ka1, Ka2, Ka3, and equivalence points.
Examples:
As an illustration of a diprotic polyprotic acid, consider sulfuric acid (H2SO4). Sulfuric acid (H2SO4) is successively deprotonated to produce HSO4- and SO42-, respectively.As an illustration of a diprotic polyprotic acid, consider sulfuric acid (H2SO3). Sulfuric acid (H2SO3) is successively deprotonated to produce HSO3- and SO32-, respectively.To know more about polyprotic acids, visit:
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if 1.600 moles of a solute are dissolved in enough water to make 400.0 ml of solution, what is the molarity?
The molarity of the solution if 1.600 moles of a solute are dissolved in enough water to make 400.0 ml is 4M
Before we calculate the molarity we should know that molarity is a unit of concentration measuring the number of moles of a solute per liter of solution.
The molarity can be calculated as follows:
as we know, 400 mL = 0.4L
Molarity = moles/volume
molarity = 1.600 moles/ 0.4L
Molarity = 4M
so,The molarity of the solution if 1.600 moles of a solute are dissolved in enough water to make 400.0 ml is 4M
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You have forgotten the ideal gas constant. Describe an experiment, similar to this one, that would allow you to determine the value for r. What information would you need to know about the h2o2 solution?.
We would need to know the concentration , volume and moles of hydrogen peroxide in order to determine the stoichometry .
What is H2O2 and what would be the suitable experiment allowing to determine the value of r and what information for h2o2 is needed?H2O2 is a chemical compound used in various chemical reactions and is slightly viscous than water .We will experiment by decomposition of hydrogen peroxide, and using the Ideal gas law rearrangement equation we can calculate the value of r .In such equation PV = rT , and hence r = PV/T where P is pressure and T is temperature.We will determine the temperature of oxygen using thermometer and in the other side we got hydrogen peroxide.This hydrogen peroxide will be bubbled through water, and we will need the information such as concentration, volume and moles of h2o2 to determine its stoichmetry.To know more about solution visit:
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What is the correct lewis electron-dot structure for the compound made of magnesium fluorine after forming an ionic bond?.
In the Lewis structure of MgF₂, each magnesium atom and each fluorine atom has two single bonds. Two fluorine atoms flank the magnesium atom. There are no lone pairs present on magnesium ion however there are three lone pairs on each of the fluorine atoms.
What is lewis electron-dot structure?Each element has a certain number of electrons in its atomic orbitals. Of these electrons, only those involved in bond formation with other atoms are present in the outermost shell of the atom. These electrons in the outermost orbital of the atom are called valence electrons.
MgF₂ is an ionic compound consisting of a magnesium cation and a fluoride anion. To draw the electron dot or Lewis diagram of this compound, you must first draw the electron configuration of the atoms.
Electronic configurations:
Mg : 1s²2s²2p⁶3s²
F : 1s²2s²2p⁵
By donating two electrons, magnesium has a full octet in its outer shell, and fluorine lacks only one electron to complete its octet, so two fluorine atoms bond with magnesium. Forms stable MgF₂ compounds. Thus an ionic bond is formed.
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what is the standard reductiion potential e
The standard reduction potential of a species is the tendency of that species to get reduced. It measures the reduction tendency of a chemical species.
What is reduction?
Reduction in a chemical reaction is the increase in the number of electrons of the atoms or group of atoms involved. The reaction which loses oxygen or gains hydrogen can also be termed as reduction.
Standard reduction potential measures the tendency of a chemical species to get reduced. It can be calculated by subtracting the standard reduction potential at anode from the standard reduction potential at the cathode.
Therefore, standard reduction potential of a given species is the tendency of that species to undergo reduction in a redox reaction.
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What is Ecosistema Lentico?
Hello..!
¿What is Ecosistema Lentico?
It is one that presents a closed structure and that its waters are permanently stagnant.
Are:
LakesLagoonsSwampsWetlands0.2 g of gas A has equal volume to that occupied by 0.16 g of gas B having vapour density 32 calculate the molecular mass of A
The calculation of the molecular mass of A is 64.
Molar mass is described as the mass in grams of 1 mole of a substance. The units of molar mass are grams in line with mole, abbreviated as g/mol. The mass of a single isotope of any given detail (the isotopic atomic mass) is a cost touching on the mass of that isotope to the mass of the isotope carbon-12.
Calculation:-
mass A = 0.2 g
mass B = 0.16 g
vapour density = 32
molar mass = 2 × VD
= 64.
In chemistry, the molar mass of a chemical compound is defined as the mass of a pattern of that compound divided by using the amount of substance which is the range of moles in that sample, measured in moles. The molar mass is a bulk, now not molecular, belongings of a substance.
Molecular mass and system mass are typically used as a synonym of molar mass, specifically for molecular compounds; but, the maximum authoritative resources outline it differently.
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Solid al(no3)3 is added to distilled water to produce a solution in which the concentration of nitrate, [no3-], is 0. 10 m. What is the concentration of aluminum ion, [al3+], in this solution?.
The concentration of aluminum ion, [Al⁺³] in this solution is 0.033 M
What is a chemical equation?A chemical equation is a symbolically represented chemical reaction in the form of chemical formulas and symbols. The reactant entities are on the left, and the product entities are on the right, with a plus sign between the entities in both the reactants and the products, and an arrow pointing towards the products to indicate the reaction direction. Chemical formulas can be symbolic, structural (pictorial diagrams), or a combination of both. The absolute values of the stoichiometric numbers are indicated by the coefficients next to the symbols and formulas of entities. In 1615, Jean Beguin drew the first chemical equation.
Given, Solid Al(NO₃)₃ is added to distilled water to produce a solution.
The chemical equation is,
Al(NO₃)₃ -------------> Al⁺³+NO⁻₃
From the equation 1 mole of aluminum ion produces 3 moles of nitrate ion
Assume that the concentration of [NO⁻₃] is 3x
Hence, from the given chemical equation,
[Al⁺³]=x
Given that,
[NO⁻₃] =0.10 M
We have to find [Al⁺³]=?
3x=0.10 M
x= (0.10/3)
x=0.033 M
Therefore, the concentration of aluminum ion in this solution is 0.033 M
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4. You have Four olution A,B,C,D. A- Milk in water B- Baking powder in water C- Vinegar in water D- Glucoe in water. What colour change would you expect when you dip a red litmu into each of thee tet tube\
According to the given condition the color will change to blue if you dip red litmus paper in second solution ie. Baking powder in water.
What does red litmus paper indicate?Using litmus paper, which turns red for acidic materials and blue for alkaline or basic materials, the substance is determined. When the pH is between 4.5 and 8.3, litmus paper turns red and turns blue. The pH level is near to neutral if the paper becomes purple.A combination of several colours taken from lichens and made water-soluble is known as litmus. One of the earliest kinds of pH indicators, used to assess the acidity of materials, is frequently produced by its absorption onto filter paper.Additionally, water-soluble gases that influence acidity or basicity can be detected using wet litmus paper; the gas dissolves in the water and the resulting solution colours the litmus paper. For instance, alkaline ammonia gas causes red litmus paper to turn blue. While all pH paper functions as litmus paper, the reverse is not true.To learn more about litmus paper refer :
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Lithium and potassium have similar chemical properties because the atoms of both elements have the same.
Lithium and potassium have similar chemical properties because they both have the same number of valence electrons.
Give a brief idea about valence electrons.A valence electron is an electron that is part of an atom's outer shell and can take part in the synthesis of a chemical bond if the outer shell is open. Each atom in the bond contributes one valence electron to create a shared pair in a single covalent bond.
The chemical properties of an element, such as its valence—whether it can connect with other elements and, if so, how quickly and with how many—may be affected by the existence of valence electrons. In this approach, the electrical arrangement of an element greatly influences its reactivity. A valence electron can only be found in the outermost electron shell of a main-group element, but it can also be found in an inner electron shell of a transition metal.
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SOMEONE HELP ME WITH THIS PLEASE I'LL MARK AS BRAINLIEST
Our electronegativity calculator is here to assist you with your chemistry questions about atom bonds. It calculates the type of bond based on the electronegativity values of the elements.
How to calculates electronegativity values of the elements ?Electronegativity is a measure that differs between atoms and influences their chemical properties as well as the type of bond formed.
Using the electronegativity calculator, you can determine the type of bond formed between different elements based on their electronegativity values.
You can also use our tool as an electronegativity difference calculator to calculate the difference between two elements' electronegativity values. Follow the steps below to determine the type of bond between elements based on electronegativity:
Choose the first element's electronegativity value.Choose the second element's electronegativity value.The calculator computes the difference between these two electronegativities before displaying the type of bond formed by these two elements. This feature is known as the ionic or covalent calculator.To learn more about electronegativity values of the elements refer to:https://brainly.ph/question/11980884
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An excited hydrogen atom emits light with a wavelength of 397. 2 nm to reach the energy level for which n = 2. In which principal quantum level did the electron begin?.
The principal quantum level where the electron begin was 7
What is quantum level?Quantum levels can refer to energy levels, a bound particle can only take on certain discrete energy values called energy levels. Quantum domain, also known as quantum scale, is a physical term that refers to the scale at which quantum mechanical effects become significant.
To determine the principal quantum level, we would use the Rydberg equation:
[tex]\frac{1}{\lambda}[/tex] [tex]= R(\frac{1}{n_{2} ^{2} } - \frac{1}{n_{1} ^{2} })[/tex]
Given,
λ = Wavelength (397. 2 nm or × 10⁻⁹m)
n₁ = Initial transition
n₂ = Final transition (n = 2)
R = Rydberg constant (1.09 × 10⁷ m⁻¹)
Substitute the values in the above formula:
[tex]\frac{1}{ 397. 2* 10^{-9} }[/tex] [tex]=1.09*10^{7} (\frac{1}^{6^{2} } } - \frac{1}{n_{1} ^{2} })[/tex]
n₁ = 7.07
n₁ ≈ 7
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What enzyme moves outward from the origin of replication and breaks hydrogen bonds between dna nucleotides?.
Helicase enzyme moves outward from origin of replication and breaks hydrogen bonds between DNA nucleotides.
An enzyme is a bio catalyst which is nearly a protein. It speeds up the rate of a specific chemical reaction inside the cellular. The enzyme isn't destroyed in the course of the chemicsl reactaion and is used again and again.
Common digestive enzymes include : Carbohydrase breaks down carbohydrates into sugars. Lipase convert fat into fatty acids.
Enzymes help in speeding up chemical reactions in the human body. They are crucial for respiratory, digesting food, muscle and nerve characteristic, amongst heaps of different roles. Every cell in the human body contain lots of enzymes. Enzymes provide help with facilitating chemical reactions within each cellular.
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The ability of a covalently bonded atom to attract the shared electrons is called?.
Electronegativity is the ability of a covalently bonded atom to attract shared electrons.
Electronegativity was introduced by Linus Pauling in 1932 and over the years, different scientists, such as Robert S. Mulliken, have proposed their own scales of electronegativity for the elements as well.
Electronegativity varies across the periodic table in a predictable manner (it follows a pattern). It increases from left to right across periods, and increases from bottom to top in groups. Fluorine is the most electronegative element and Francium is the most least electronegative one. When atoms are joined together and they have an electronegativity difference of fewer than two units, the bond formed is a covalent bond, in which the electrons are shared by both atoms.
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how does the self-sustained chemical reaction influence the oxidation reaction in flaming combustion?
Increases the speed of the oxidation reaction is correct answer.
What is oxidation reaction?
The chemical reactions in which electrons are transferred from one chemical substance to another. These electron-transfer events are known as redox reactions or oxidation-reduction reactions. These reactions are accompanied by energy changes such as heat, light, and electricity, among others.
An oxidation-reduction reaction, often known as a redox reaction, is a chemical reaction that involves the transfer of electrons between chemical species (the atoms, ions, or molecules involved in the reaction). Redox reactions are all around us: the combustion of fuels, metal corrosion, and even photosynthesis and cellular respiration include oxidation and reduction.
Gray colours in soil are largely caused by oxidation-reduction processes. These reactions require organic substances, microorganisms, and no oxygen to take place. The amount of low chroma colour in soil is usually proportional to how long it has been reduced, rather than how long it has been saturated; however, some sandy soils are naturally low in iron and have low chroma colours that are not proportional to reduction. Concentrations and depletions are the types of redoximorphic features formed by Fe/Mn reduction, translocation, and oxidation. In the field, soil morphology caused by redox reactions is used to identify hydric soils.
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The self-sustained chemical reaction influence the oxidation reaction in flaming combustion in the way that it increases the speed of the oxidation reaction.
What is oxidation ?
Oxidation is the loss of electrons during reactions by molecules, atoms, or ions.
Oxidation occurs when the oxidation state of a molecule, atom, or ion increases. The reverse process, called reduction, occurs when electrons are gained or the oxidation state of an atom, molecule, or ion is reduced. The old meaning of oxidation was the addition of oxygen to a compound. This is because oxygen gas (O2) was the first known oxidant. The addition of oxygen to a compound usually satisfies the criteria of electron loss and oxidation state increase, but the definition of oxidation extends to other types of chemical reactions.
A classic example of the old definition of oxidation is the combination of iron and oxygen to form iron oxide or rust. The iron is said to have oxidized and rusted.
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An atom x has three electrons in its outermost shell. Which ion will most likely be formed by x?.
Three electrons are located in an atom's outermost shell. It is most likely that x will produce an X3+ ion. The electron is a subatomic particle with a negative one elementary charge electric charge.
Due to their lack of components or substructure, electrons, which are part of the lepton particle family's first generation, are typically regarded to be elementary atom's. Any electrons outermost shell of the outermost shell are considered inner shell atom's. They lessen the effective nuclear charge by insulating the valence electrons from the nucleus.
The outermost shell is the firefighter's initial line of defence against dangers. It should have sufficient mechanical resistance to cuts, snags, tears, and abrasion in addition to provide fundamental protection against exposure to flame, heat, and other environmental hazards.
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how many grams of carbon dioxide can be produced by burning 6.50 moles of propane? assume that oxygen is the excess reactant in this reaction. round your answer to 3 significant digits.
858.185 grams of Carbon Dioxide can be produced when 6.50 moles of Propane is burned.
What is Propane?
Propane is a three-carbon alkane and has the molecular formula C3H8. In addition to low-emission public transportation, propane is also used as fuel in home and industrial applications.
When 1 mole of Propane undergoes combustion in presence of oxygen, 3 moles of Carbon Dioxide is produced.
Using this, we can calculate that
6.50 moles of propane x 3 gives us 19.50 moles of Carbon Dioxide.
Converting moles to grams, we get 1 mole of CO2 is 44.009 grams.
Therefore, 19.50 x 44.009 = 858.185 grams of CO2.
Hence, we can say that 858.185 grams of CO2 is produced when 6.5 moles of propane is burned.
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Burning 6.50 moles of propane can result in the production of 858.185 grammes of carbon dioxide.
What is Propane?
The chemical formula for propane is C3H8, a three-carbon alkane. In addition to being a fuel for low-emission public transportation, propane is also employed in domestic and commercial settings. Three moles of carbon dioxide are created when one mole of propane is burned in the presence of oxygen.
With this, we can determine that
We get 19.50 moles of carbon dioxide when we multiply 6.50 moles of propane by 3.
1 mole of CO2 is equal to 44.009 grammes when converted to grammes.
As a result, 19.50 times 44.009 equals 858.185 grammes of CO2.
Thus, we can state that the combustion of 6.5 moles of propane results in the production of 858.185 grammes of CO2.
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which region of a titration could you use the henderson-hasselbalch equation to determine the ph? group of answer choices
Region B of the titration curve can be used to determine the pH
Henderson-hasselbalch equation is mostly used for buffer solutions. Buffer solutions are the solutions of weak acids and their salts, for example, the mixture of acetic acid and sodium acetate will act as a buffer solution. The major role of buffer solution is to resist the change in pH.
So it is clear that buffer solutions have an acid and a conjugate base, so region B can represent the pH. Region A of the titration curve represents the acid solution, region C represents the endpoint. While the other two regions are out of the system.
Complete question: (Graph is attached as a picture)
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in a 0.61mm aqueous solution of acetic acid ch3co2h, what is the percentage of acetic acid that is dissociated? you can find some data that is useful for solving this problem in the aleks data resource.
The 15.60% of acetic acid is in the dissociated form of the solution.
The chemical equation for the dissociation of acetic acid is the following:
CH₃COOH + H₂O ⇄ H₃O⁺ +CH₃COO⁻
To find the fraction of acetic acid that is in the dissociated form (f), we can apply the following equation. This equation comes from solving the equation of the equilibrium constant for the dissociated fraction of acetic acid:
The value of dissociation constant of acetic acid
Ka for acetic acid = 1.76 x 10⁻⁵
C is concentration, 0.61mM
[tex]f=\frac{-K\alpha + \sqrt{K\alpha ^{2}+ 4K\alpha C } }{2C} \\f= \frac{-1.76X10^{-5} + \sqrt{(1.76X10^{-5}) ^{2}+ 4(1.76X10^{-5}) (0.61X 10^{-3} ) } }{2(0.61X 10^{-3} )} \\[/tex]
f = 0.1560
in percent 0.1560 is 15.60%, so
The 15.60% of acetic acid is in the dissociated form of the solution.
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2.00 gram of a compound requires the following quantities of solvent to dissolve: 90.0 ml of water, 7.50 ml of chloroform, 32.0 ml of diethyl ether, or 85.0 ml of benzene. calculate the partition coefficient of the compound between chloroform and water, diethyl ether and water, and benzene and water. which solvent would you choose to extract the compound from an aqueous solution?
The solvent that would be used for extracting the compound from an aqueous solution will be chloroform as it has maximum solubility.
What is solubility?
Solubility is a degree to which the a substance dissolves in a solvent to make a solution. Solubility is expressed as grams of solute per litre of solvent.
Solvent requires 2 grams of compound to dissolve.
Finding solubility
For water, 2g/90ml= 2.22
For chloroform, 2g/7.50= 26.6
For diethyl ether, 2g/32= 6.25
For benzene, 2g/85= 2.35
Partition Coefficients -
For chloroform = 11.98
For Diethyl Ether = 2.81
For Benzene = 1.05
Hence, Chloroform would be chosen to extract compound from an aqueous solution as it has maximum solubility.
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Since chloroform has the greatest solubility, it would be the solvent of choice for removing the compound from an aqueous solution.
What is solubility?
A homogeneous mixture of one or even more solutes in a solvent is referred to as a solution. A typical illustration of a solution is the addition of sugar cubes to a cup of tea or coffee. Solubility is a quality that aids in the dissolution of sugar molecules. Thus, the ability of a substance (solute) to dissolve in a specific solvent can be defined as solubility. Any substance that is dissolved in a solvent and is either solid, liquid, or gas is referred to as a solute.
Compound needs 2 grammes of solvent to dissolve it.
Finding solubility
For water, 2g/90ml= 2.22
For chloroform, 2g/7.50= 26.6
For diethyl ether, 2g/32= 6.25
For benzene, 2g/85= 2.35
Partition Coefficients -
For chloroform = 11.98
For Diethyl Ether = 2.81
For Benzene = 1.05
As a result of its high solubility, chloroform would be used to extract a compound from an aqueous solution.
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In the reaction 2h2 o2 → __h2o, what coefficient should be placed in front of h2o to balance the reaction? responses 1 1 2 2 3 3 4
The coefficient 2 should be placed in front of H2O to balance the following reaction: 2H2 +O2 = 2H2O.
When each element has the same amount of atoms on both sides of the equation, the equation is said to be balanced. Chemical equations are balanced through the application of coefficients. An element is given a coefficient, which is a number, to complete the number of atoms.
In the subsequent response:
2H2 +O2 = H2O.
We use coefficient 2 to balance the number of hydrogen and oxygen atoms. To balance the following reaction, coefficient 2 should be put in front of H2O: 2H2 +O2 = 2H2O.
A coefficient is an integer that is either multiplied by the variable it is associated with or written alongside the variable. A coefficient is, in other words, the numerical factor of a term that contains both constants and variables. For instance, the coefficient in the expression 2x is 2.
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what volume of carbon dioxide will be produced as a result of the combustion of 2.0l of methane gas and 2.0l of oxygen gas, under conditions of constant temperature and pressure?
1.0 L of carbon dioxide will be produced as a result of the combustion of 2.0L of methane gas and 2.0L of oxygen gas, under conditions of constant temperature and pressure
The reaction for the combustion of methane gas (CH4).
CH4(g)+2O2(g)⟶CO2(g)+2H2O(g)
The quantity of moles in a gas is exactly proportional to its volume under constant temperature and pressure. Therefore, based on the balanced equation, 1 L of methane (CH4) and 2 L of oxygen will combine to create 1 L of carbon dioxide (CO2) and 2 L of water.
As 2.0L of oxygen will completely react with 1.0L of methane, leaving 1.0L of methane unreacted, oxygen serves as the limiting reactant. 1.0L of carbon dioxide (CO2) will therefore be created.
Keep in mind that while the coefficients in stoichiometric equations (which represent the number of moles) are accurate, the number of significant figures is not constrained.
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How do you make chocolate less likely to melt?.
The steps which make chocolate less likely to melt are: heat the chocolate up to 120 degree Fahrenheit and then after removing the bowl cool down it below 80 degree Fahrenheit.
Chocolate is made up of the combination of cocoa solids and cocoa butter. Most chocolate includes sugar, and many chocolates have milk, vanilla and an emulsifier called lecithin added as well.
Tightly packed beta crystals gives the tempered chocolate its distinct snap , gloss and the smooth texture. Alpha crystals, on the other hand, makes chocolate soft and dull.
Tempering is the process in which the crystal formation in chocolate is controlled; desirable beta crystals that make the chocolate firm can be formed by taking the chocolate through the series of gentle and controlled temperature changes.
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the combustion of ethane produces carbon dioxide and steam how many moles of co2 are produced when 5.55 mol of ethane is burned in an excess of oxygen?
11.1 moles of CO2 are produced when 5.55 moles of ethane is burned in excess of oxygen
What is combustion reaction?
Burning, also known as combustion, is a high-temperature exothermic redox chemical process that occurs when an oxidant, typically atmospheric oxygen, reacts with a fuel (the reductant) to generate oxidized, frequently gaseous products in a mixture known as smoke. Fire does not always arise from combustion because a flame can only be seen when the chemicals being burned evaporate, but when it does, the flame serves as a distinctive indicator of the reaction.
The balanced equation for combustion of ethane is
2C2H6(g)+7O2(g)⟶4CO2(g)+6H2O(g)
According to this reaction it is understood that,
2 moles of carbon ethane produces 4 moles of CO2
So, 5.55 moles of ethane produces x moles of CO2
x= (5.55* 4) / 2= 11.1 moles
Hence, 11.1 moles of CO2 are produced when 5.55 moles of ethane is burned in excess of oxygen.
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For which applications would you choose a liquid over a gas or solid?washing clotheslinking a brake pedal to the brake pads at the wheels of a cardeodorizing a roomcarving a sculpturedissolving sugarpainting a wallmaking a gear for a machine.
Washing Clothes & Dissolving Sugar are applications we choose a liquid over a gas or solid.
Applications:Washing clothes: You kind of need water to do this, or not much washing can be done. Linking brake pedals to the brake pads: You don't need any liquids for this. You need solids.Deodorizing a room: You would problem choose an aerosol, which is sprayed, thus a gas.Carving a sculpture: You would use a solid tool and a sold sculpture. Dissolving sugar: You need a liquid to dissolve sugar! Painting a wall: Perhaps, you COULD say that the paint is a liquid... but I'm not sure if that really counts. I believe this application would still be solids. Gear for a machine is solid!Learn more about solids or gas here:-
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g calculate the volume in milliliters of a barium chloride solution that contains of barium chloride .
147 ml will be the volume in milliliters of a 0.51 M barium chloride solution that contains 75.0 mmol barium chloride.
Molarity of the solution = 0.51 M
Number of mmol of solute = 75.0 mmol
Volume of solution = ?
To find out the volume we use the formula of molarity
molarity = number of mmol / volume of solution (ml)
Rearrange the equation for volume
volume of solution (ml) = number of mmol / molarity
volume of BaCl2 (ml) = 75 mmol / 0.51 mmol/ml
volume of BaCl2 (ml) = 147 ml
The complete question is as:
Calculate the volume in milliliters of a 0.51 M barium chloride solution that contains 75.0 mmol of barium chloride BaCl₂. Be sure your answer has the correct number of significant digits.
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How does the solubility of the oxygen in water affect the value of the determined experimental r?.
The solubility of oxygen in water rises, resulting in an increase in experimental R value.
What is meant by solubility?Solubility is defined as the amount of a substance that will dissolve in a given amount of solvent at a given temperature. The solubility of a specific solute-solvent combination varies greatly.
R is a constant in the gas law.
The solubility of a gas is proportional to its temperature.
1/Temperature ∝Gas Solubility
This means that as the temperature rises, the solubility of the gas decreases and vice versa.
However, R is proportional to temperature.
R(1/T ∝ R) ∝ Solubility
That is, as R increases, the solubility of the gas increases.
As a result of the preceding conclusion, the solubility of oxygen in water rises, resulting in an increase in R value.
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The green light emitted by a stoplight has a wavelength of 525 nm. What is the frequency of this photon? (c = 3.00 × 10⁸ m/s).
The frequency of this photon is 5.94 x [tex]10^{14} H_{Z}[/tex].
Solution:
The speed of light has a value of approximately 3.00×108 m/s
The wavelength should have units of meters.
The frequency should have units of Hz or s−1. Hz is hertz or reciprocal seconds.
We know the value of the speed of light and we are given the wavelength. All we have to do is rearrange the equation to solve for the frequency:
v = c/λ
= 3.00×[tex]10^{8}[/tex] m/s/505×[tex]10^{-9}[/tex] m
= 5.94X[tex]10^{14}[/tex]s-1
= 5.94X[tex]10^{14}[/tex] Hz
Frequency describes the number of waves passing through a particular location at a particular time. A class interval frequency is the number of observations that occur in a particular predefined interval. So, for example, if 20 of her ages 5-9 appear in the survey's data, the interval 5-9 has a frequency of 20. The class interval endpoints are the lowest and highest possible values of the variable.
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