Which redox reaction would most likely occur if silver and zinc metal were added to a solution that contained silver and zinc?
The redox reaction which would most likely occur if silver and zinc metal were added to a solution that contained silver and zinc is Zn + Ag[tex]^+[/tex] [tex]\rightarrow[/tex]Zn[tex]^2+[/tex] + 2 Ag .
What is redox reaction?Redox reactions comprise of two parts a reduced part and an oxidized part, which occur simultaneously . The part which is reduced gain electrons and hence there is a increase in oxidation state of the species.
While, the part which is oxidized looses electrons and hence there is a decrease in oxidation state of the species.During redox reactions, there is no net change in the number of electrons . Electrons which are given off in oxidation are used up in reduction.
The ion or molecule which accepts electrons is called as oxidizing agent while the ion or molecule which donates electrons is called as a reducing agent.
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What are the function of the cytokinesis hormone in plant's. Choose the correct answer
A ) ! ck jd pyk v zc !
B ) ! ck jd pyk v zc !
These are some of the important functions of the cytokinesis hormone in plants :-
Cytokinesis is a group of growth regulators that is found in plants. It helps in performing cell divison of plant roots, and shoot system. It also helps in promoting the cell's growth, development, flowering, and seed formation.
It helps in the protein production which is important for mitosis. It provides resistance against certain diseases causing bacteria in crops. It mainly contains Nitrogen, Hydrogen, and a few atoms of oxygen in its structure.
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The options for the function of cytokinesis should be:
(A) performing cell division in plant roots
(B) shoot system
(C) promoting the cell’s growth, development
(D) All of these
Answer - (D) All of these
which compounds are responsible for the bitter flavor in coffee? catechin caffeine chlorogenic acids theaflavins
The "chlorogenic acids" that give coffee its bitter flavor are these substances. responsible for coffee's harsh taste
How healthy is coffee?
A proper nutrition may for the majority of folks incorporate moderate coffee consumption. Hu found a link between drinking 2 to 5 cups of coffee per day and a lower risk of gynecological, type 2 diabetes, heart disease, as well as liver illness.
The healthiest coffee is which one?
Black, freshly prepared cappuccino is the best option. One cup has very little calories, carbohydrates, or fat, and very little salt. Niacin, potassium, and magnesium are among the micronutrients included in black cappuccino.
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contrary to kegend, caneks di bit stire water ib their humps, which actually consiste of large fat deposits. how can these fat deposits serve as a source of water
Contrary to kegend, caneks di bit store water in their humps, which actually consist of large fat deposits. These fat deposits serve as a source of water because oxidation of fats releases metabolic water.
During the oxidation of organic substances (fats) releases metabolic water along with release of energy which will be explained with the example below
For example –
Oxidation of one mole of Palmitic acid (C16H32O7) acid releases 146 mole of H2O. In Tri palmitoyl glycerol (fat C51H98O6) , there are 3 palmitic acid residues connected to glycerol molecule via ester bonds.
The equation of Oxidation of Palmitoyl CoA will be as follows;
palmitoyl-CoA + 23O2 + 108Pi + 108 ADP => 88nCoA + 108 ATP + 16CO2 + 23 H2O
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what is the vapor pressure (in torr) of a subtance at 36 c, whose normal boiling point is 84 c and has a delta hvap of 22.1 kj / mo
The vapor pressure of a substance is 241 Torr that can be calculated using Clausius-Clapeyron relation.
The Clausius-Clapeyron relation is used to characterize a discontinuous phase transition between two phases of the same constituent such as ice. The plot is drawn between 1/T vs ln P.
This equation can be expressed as follows:
ln(P2/P1) = (-ΔHvap/ R)*((1/T2) - (1/T1))
Where T1 is initial temperature, in our case it is normal boiling point = 84oC = 357 K
T2 is final temperature, in our case it is 36oC = 309 K
We know that at normal boiling point the vapor pressure of the substance become equal to the atmospheric pressure = 1 atm.
So P1 = 1 atm. according to our approach to the question.
Now enthalpy of vaporization is given = 22.1 kJ = 22100 J
Now put it in Clausius Clapeyron equation and we will get
ln(P2/ 1 atm.) = (-22100 J / 8.314 J/K-mole)*((1/309 K) - (1/357 K))
P2 /0.317 atm=0.317 x 760 torr = 241 torr
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(T/F) reactive oxygen intermediates and reactive nitrogen intermediates produced by phagocytic cells are effective in killing invading microorganisms
The statement 'reactive oxygen intermediates and reactive nitrogen intermediates produced by phagocytic cells are effective in killing invading microorganisms' is true.
Phagocytic cells are the kind of cells that consume or destroy microorganisms by producing substances that are harmful to them, according to the study of biology.
The phagocytic cells produce oxygen and nitrogen intermediates, and these intermediates are reactive enough to bind to the chemicals in the microbe and inhibit their function. The microorganism dies when its activities are impeded to the point where it is unable to carry out the fundamental functions of life. Thus, the above statement is accurate.
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silver has a face-centered cubic unit cell. how many atoms of ag are present in each unit cell?
Answer:
Explanation:
as we know in a face-centered unit each atom give1/2 a portion at the face
and fully atom involvement at center therefore
1/2( total face of cube )+ 1(centre)
1/2 ×6 + 1
3+ 1
4 atoms per cell
a volume of methane gas is heated from to at constant pressure. what is the final volume of the gas? be sure your answer has the correct number of significant digits.
At constant pressure, a volume of methane gas is heated from to. The gas has a final volume of 44.1 L.
Methane is a colorless gas with no discernible odor. Due to overtone bands, it does absorb visible light, especially at the red end of the spectrum, although the impact is only apparent if the light path is very lengthy.Since pressure is constant, it also cancels with n and r when using the equation v1/t1 = v2/t2 and the law pv=nrT. demonstrate that t1 = 25 + 273.15; t2 = 88 + 273.15; and v1 = 36.4. 273.15 is the Kelvin conversion. then figure out v2. It contains 44.1 L.
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complete question
A 36.4-l volume of methane gas is heated from 25°c to 88°c at constant pressure. what is the final volume of the gas?
calculate the wavelength (in nanometers) of a photon emitted by a hydrogen atom when its electron drops from the n
As a result, the photon's wavelength (measured in nanometers) is equal to 1874 nm when the hydrogen atom's electron switches from the n = 4 state to the n = 3 state.
The electromagnetic force is carried by a photon, a basic particle that is a quantum of the electromagnetic field and includes electromagnetic radiation like light and radio waves. Due to their lack of mass, photons always travel at the speed of light in a vacuum, which is 299792458 m/s (or 186,282 mi/s). The photon is a member of the boson family. According to Planck, a material object's energy should be thought of as consisting of an integer number of discrete, equal-sized pieces. Einstein proposed that light itself may explain the photoelectric effect.
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at its boiling temperature, how much heat (in kj) is needed to completely vaporize 23.4 g of h2o? the heat of vaporization for water at the boiling point is 40.6 kj/mole.
The right response, according to the definition of the heat of vaporization, is that 52.8 kJ is required to totally evaporate 23.4 g of water.
40.6 kJ/mole is the heat of vaporization for water at its boiling point. In other words, 40.6 kJ of energy is needed to convert a mole of liquid water into a mole of gas at a constant temperature.
The amount of mass that a substance holds in one mole is known as its molar mass. The water in this instance has a molar mass of 18 g/mol. The following formula can be used to determine how many moles 23.4 g of the chemical contains:
[tex]23.4 grams x\frac{1 mole}{18 grams} = 1.3 moles[/tex]
Then you can use the rule of three as follows: How much heat of vaporization is needed to vaporize 1.3 moles of water if 1 mole of water costs 40.6 kJ?
[tex]heat = \frac{1.3 moles * 40.6kJ}{1 mole}[/tex]
52.78 kJ 52.8 kJ = heat
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which two activities can a student perform to show the formation of soil through chemical processes?
There are a few different activities that a student can perform to demonstrate the formation of soil through chemical processes. Here are two examples:
Soil acidification experiment: In this activity, students can observe the effect of acid rain on soil pH. They can set up a controlled experiment using soil samples and different concentrations of an acidic solution (such as vinegar). They can measure the pH of the soil before and after adding the acidic solution and observe any changes in the pH over time. This can help students understand how chemical processes, such as the reaction of acid rain with minerals in the soil, can alter the chemical properties of soil.
Soil mineralization experiment: In this activity, students can observe the formation of soil minerals through the process of weathering. They can set up a controlled experiment using different types of rocks and soil samples, and expose them to various weathering agents (such as water, sunlight, and temperature changes). They can then observe any changes in the composition of the rocks and soil over time, and compare the results to see which weathering agents are most effective at breaking down the rocks and forming soil minerals. This can help students understand how chemical processes, such as the reaction of water and minerals in the rock, can lead to the formation of soil over time.
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There are a few different activities that a student can perform to demonstrate the formation of soil through chemical processes. Here are two examples:
Soil acidification experiment: In this activity, students can observe the effect of acid rain on soil pH. They can set up a controlled experiment using soil samples and different concentrations of an acidic solution (such as vinegar). They can measure the pH of the soil before and after adding the acidic solution and observe any changes in the pH over time. This can help students understand how chemical processes, such as the reaction of acid rain with minerals in the soil, can alter the chemical properties of soil.
Soil mineralization experiment: In this activity, students can observe the formation of soil minerals through the process of weathering. They can set up a controlled experiment using different types of rocks and soil samples, and expose them to various weathering agents (such as water, sunlight, and temperature changes). They can then observe any changes in the composition of the rocks and soil over time, and compare the results to see which weathering agents are most effective at breaking down the rocks and forming soil minerals. This can help students understand how chemical processes, such as the reaction of water and minerals in the rock, can lead to the formation of soil over time.
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What is the name of the region around the nucleus where electrons are found?
The name of the region around the nucleus where electrons are found is orbital
An atom is the smallest component of ordinary matter with chemical elemental characteristics. Protons and neutrons, which make up its nucleus, and electrons, which orbit around them, are the subatomic particles that make up every atom. Electrons have a negative charge, neutrons have a neutral charge, and protons have a positive charge.
In other words, every atom has an electron-rich energy level and a nucleus where protons and neutrons interact. This is because electrons are present in the orbitals, or peripheral region, as opposed to the atomic nucleus, which is the centre region of the atom made up of protons and neutrons. Thus, the region around the nucleus where electrons are found is orbital
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Tin (II) oxide is placed into a bottle of hydrogen gas and a reaction occurs where metallic tin and water form:
Skeleton Equation:
Balanced Equation:
The skeleton equation of the reaction of Tin oxide and hydrogen:
[tex]SnO_2 + H_2\longrightarrow Sn + H_2O[/tex]
Balanced equation:
[tex]SnO_2 + 2H_2\longrightarrow Sn + 2H_2O[/tex]
What happened in the reaction of tin and water?Tin (Sn) can be defined as an unreactive metal. When tin dioxide and hydrogen gas react with each other, metallic tin and water are formed.
Sn is not very reactive in comparison with the other elements in its own group, it is more reactive than Ge, which lies just above it in the group. It is unaffected by water or air at room temperature. Sn is anti-corrosive and therefore applied as a coating to protect metals.
When tin dioxide (SnO₂) is placed into a bottle of hydrogen gas. The balanced chemical equation for the chemical reaction is as follows:
[tex]SnO_2 + 2H_2\longrightarrow Sn + 2H_2O[/tex]
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an acetate buffer has a ph of 4.40. which of the following changes will cause the ph to decrease?
The pH will decrease if more acid, such as a small amount of HCl, is added to the buffer system. To dissolve 246.1 g of sodium acetate, combine it with 500 mL of deionized water.
The pH can be increased to 5.2 by using glacial acetic acid. It is advisable to let the solution cool over night. You can increase the pH by one more point to 5.2 by using glacial acetic acid. By adding sodium from the conjugate base, a weak acid solution's pH can be raised. This makes sense because adding a base should increase the pH of a weak acid sodium solution, and sodium acetate is a basic.
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Which option is a measure of the average kinetic energy of the particles in a substance? (1 point)
O thermal energy
O heat
O temperature
O phase
Answer:
Temperature <3
Explanation:
Since it's use to measure kinetic energy, have a nice day! :)
what is the process that is responsible for moving molecules from an area of high concentration to an area of low concentration? in what part of the circulatory system does this happen?
The process that is responsible for moving molecules from an area of high concentration to an area of low concentration is diffusion. The part of the circulatory system in which this happen is the alveoli.
Diffusion is a passive process of transport. A single substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space.
For example, someone is opening a bottle of perfume in a room filled with people. The perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the bottle, and gradually, more and more people will smell the perfume as it spreads.
In a process called diffusion, oxygen moves from the alveoli to the blood through the capillaries (tiny blood vessels) lining the alveolar walls.
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determine the volume in ml of 0.585 m hno3(aq) needed to reach the half-equivalence (stoichiometric) point in the titration of 39.29 ml of 0.644 m ch3nh2(aq)(aq). the kb of methylamine is 3.6 x 10-4.
Molarity x volume = 0.585 M x 39.29 mL = 22.984 mmol
At half equivalence point, half of base is neutralized.
Amount of methylamine neutralized: 22.984 /2 = 11.492 mmol
Volume = moles/ molarity = 11.492mmol/0.644M = 17.84mL
We divide the total number of moles of solute by the sum of the solution's liters to determine the molarity of the solution. A chemical species' concentration in a solution, specifically the volume of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per liter is the most often used unit for molarity in chemistry.
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According to Markovnikov's rule, the hydrogen in HOH (water) adds to the carbon in the double bond A) attached to the end carbon. B) that has the smaller number of hydrogen atoms attached. C) that has greater number of H atoms attached. D) that has smaller number of C-atoms attached. E) that has the greater number of carbon atoms attached.
As per Markovnikov's rule, the hydrogen in HOH (water) adds to the carbon in the double bond (C): that has a greater number of H atoms attached.
Markovnikov's law states that when an asymmetrical reagent is added to an asymmetrical alkene, the negative half of the reagent is attached to the carbon atom containing fewer hydrogen atoms. To put it simply, Markovnikov's rule states that hydrogen is added to the carbon with the greater number of hydrogens and the halide is added to the carbon with the least hydrogens.
An example of a reaction that observes Markovnikov's rule is that in HOH, hydrogen attaches itself to the carbon having more hydrogen substituents.
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assuming standard conditions, this reaction is spontaneous at 298 k. at what temperature will this reaction reverse spontaneity, still assuming standard conditions?
The thermodynamic equilibrium constant In a chemical equilibrium, K is the appropriate quotient of species activities. At normal temperatures and pressures, an activity cannot be very many orders of magnitude more than one.
The definition of thermodynamic properties is "system characteristics that can specify the state of the system." Some constants, like R, are not attributes since they do not describe the state of a system. Thermodynamics states that the conversion of diamond to graphite occurs spontaneously and is favourable. However, this reaction moves extremely slowly because kinetics, not thermodynamics, regulates it. As a result, diamond is thermodynamically unstable but kinetically stable. An axiomatic idea in thermodynamics is the concept of equilibrium. One thermodynamic system's internal state, or a relationship between numerous thermodynamic systems, is what it is.
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the probability density goes to zero along which of the following planes: xy, xz, or yz?
The probability density goes to zero al0ng the 'XY' and 'XZ' planes. Therefore, options A: XY and B: XZ are correct.
The probability density is a function for which the integral is calculated to find probabilities associated with a continuous random variable. The graph of the probability density is a curve above the horizontal axis that indicates a total area, between itself and the axis, of 1.
Along XY and XZ planes, the probability density goes to zero. Zero probability density means zero chance of noticing the particle in that state.
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FILL IN THE BLANK. an electron cannot have the quantum numbers n = ________, l = ________, ml = ________.
An electron will not posses the quantum numbers n = 1, l = 1, ml = 1.
Quantum numbers may be the number sequence utilized to express the location and velocity of an electron within an atom. The primary, azimuthal, magnetic, as well as spin quantum numbers are just the four types of quantum numbers.
Wolfgang Pauli established the Pauli Exclusion Principle in 1926, which states that each electron has a special combination of quantum numbers. In other words, the values of n, l, ml, and ms cannot be like for pair of electrons.
-- The given question is incomplete, the complete question is:
"An electron cannot have the quantum numbers__"n = ________, l = ________, ml = ________.
A) 2, 0, 0
B) 2, 1, -1
C) 3, 1, -1
D) 1, 1, 1
E) 3, 2, 1" --
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What is the mass of an electron in atomic mass units (amu)?
The mass of an electron in atomic mass units is 0.000549 u
A negatively charged subatomic particle known as an electron can either be free or attached to an atom which is not bound. One of the three main types of particles within an atom is an electron that is bonded to it; the other two are protons and neutrons.
The atomic mass unit (AMU), which is a unit of mass used to express the masses of atoms and molecules, should be noted. The mass of an electron in atomic mass units is 0.000549 u. In physics and chemistry, this unit is frequently used to denote the masses of atoms, molecules, and subatomic particles like protons, neutrons, and electrons. This value is based on the most precise measurements of the mass of the electron available.
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Where does most of Earth's available carbon come from?
A. the constant process of photosynthesis
B. sunlight that is transferred from the Sun to Earth
C. the convection process that occurs in Earth's mantle
D. dead organisms that are recycled back into the environment
Answer: the constant process of photosythesis
Explanation:
it say in the etxt book
A scuba diving tank of oxygen gas has a pressure of 204 atm when kept in a climate-controlled storage area with a temperature of 23c. what would be the pressure inside the tank if left outside in the sun when the temperature is 37c?
The pressure inside the tank would be approximately 308 atm if it were left outside in the sun at a temperature of 37C.
The pressure inside the tank will increase if the temperature increases. This is because the oxygen molecules in the tank will have more energy and will collide with the walls of the tank more frequently, resulting in higher pressure.
To calculate the new pressure, you can use the ideal gas law, which states that the pressure of a gas is directly proportional to its temperature and the number of molecules present (assuming the volume is constant).
So, the new pressure can be calculated using the following equation:
P1/T1 = P2/T2
Where:
P1 is the initial pressure (204 atm)T1 is the initial temperature (23C)P2 is the final pressure (what we want to find)T2 is the final temperature (37C)Solving for P2, we get:
P2 = (P1 * T2) / T1
= (204 atm * 37C) / 23C
= approximately 308 atm
So the pressure inside the tank would be approximately 308 atm if it were left outside in the sun at a temperature of 37C.
It's worth noting that this calculation assumes that the gas in the tank is an ideal gas, which means it follows the ideal gas law perfectly. In reality, the behavior of gases can deviate from the ideal gas law due to the presence of intermolecular forces, and the pressure in the tank may not exactly match the value calculated using the ideal gas law.
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The pressure inside the tank would be approximately 308 atm if it were left outside in the sun at a temperature of 37C.
The pressure inside the tank will increase if the temperature increases. This is because the oxygen molecules in the tank will have more energy and will collide with the walls of the tank more frequently, resulting in higher pressure.
To calculate the new pressure, you can use the ideal gas law, which states that the pressure of a gas is directly proportional to its temperature and the number of molecules present (assuming the volume is constant).
So, the new pressure can be calculated using the following equation:
P1/T1 = P2/T2
Where:
P1 is the initial pressure (204 atm)
T1 is the initial temperature (23C)
P2 is the final pressure (what we want to find)
T2 is the final temperature (37C)
Solving for P2, we get:
P2 = (P1 * T2) / T1
= (204 atm * 37C) / 23C
= approximately 308 atm
So the pressure inside the tank would be approximately 308 atm if it were left outside in the sun at a temperature of 37C.
It's worth noting that this calculation assumes that the gas in the tank is an ideal gas, which means it follows the ideal gas law perfectly. In reality, the behavior of gases can deviate from the ideal gas law due to the presence of intermolecular forces, and the pressure in the tank may not exactly match the value calculated using the ideal gas law.
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FILL IN THE BLANK. the nmda receptor is unusual in that it is ________-dependent and ________- dependent.
The NMDA receptor is unusual in that it is voltage-dependent and neurotransmitter- dependent.
N-methyl-D-aspartate receptors (also known as NMDA receptors or NMDARs) are glutamate receptors and ion channels found in neurons. The NMDA receptor is one of three ionotropic glutamate receptors, the other two being the AMPA and kainate receptors. Depending on its subunit composition, its ligands are glutamate and glycine (or D-serine). However, ligand binding is usually not sufficient to open the channel, as it can be blocked by Mg2+ ions, which are removed only when the neuron is sufficiently depolarized.
Functional NMDA receptors are heterotetramers composed of two GluN1 subunits and usually two GluN2 subunits. There are one GluN1, four GluN2, and two GluN3 subunits encoding genes, and each gene can generate multiple splice variants. NMDA receptors regulate the development of neuron-specific excitability through cell-autonomous mechanisms. The maturation of neuronal and synaptic functions during childhood is essential for neural circuit and behavioral development.
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calculate the ph for each of the cases in the titration of 50.0 ml of 0.190 m hclo(aq) with 0.190 m koh(aq)
The ph for each of the cases in the titration of 50.0 ml of 0.190 m hclo(aq) with 0.190 m koh(aq) is 10.1878.
Case 1 when 0.0 mL of KOH is added Ph is 4.0596
Case 2 when 25.0 mL of KOH is added Ph is 7.398
Case 3 when 35.0 mL of KOH is added Ph is 7.766
Case 4 when 50.0 mL of KOH is added Ph is 10.1878
Case 5 when 60.0 mL of KOH is added Ph is 12.2374
Calculation :
1) .when 0.0 mL of KOH is added
HClO dissociates as:
HClO -----> H+ + ClO-
0.19 0 0
0.19-x x x
Ka = [H+][ClO-]/[HClO]
Ka = x*x/(c-x)
Assuming x can be ignored as compared to c
So, above expression becomes
Ka = x*x/(c)
so, x = sqrt (Ka*c)
x = sqrt ((4*10^-8)*0.19) = 8.718*10^-5
since c is much greater than x, our assumption is correct
so, x = 8.718*10^-5 M
use
pH = -log [H+]
= -log (8.718*10^-5)
= 4.0596
2)when 25.0 mL of KOH is added
Given:
M(HClO) = 0.19 M
V(HClO) = 50 mL
M(KOH) = 0.19 M
V(KOH) = 25 mL
mol(HClO) = M(HClO) * V(HClO)
mol(HClO) = 0.19 M * 50 mL = 9.5 mmol
mol(KOH) = M(KOH) * V(KOH)
mol(KOH) = 0.19 M * 25 mL = 4.75 mmol
We have:
mol(HClO) = 9.5 mmol
mol(KOH) = 4.75 mmol
4.75 mmol of both will react
excess HClO remaining = 4.75 mmol
Volume of Solution = 50 + 25 = 75 mL
[HClO] = 4.75 mmol/75 mL = 0.0633M
[ClO-] = 4.75/75 = 0.0633M
They form acidic buffer
acid is HClO
conjugate base is ClO-
Ka = 4*10^-8
pKa = - log (Ka)
= - log(4*10^-8)
= 7.398
use:
pH = pKa + log {[conjugate base]/[acid]}
= 7.398+ log {6.333*10^-2/6.333*10^-2}
= 7.398
3)when 35.0 mL of KOH is added
Given:
M(HClO) = 0.19 M
V(HClO) = 50 mL
M(KOH) = 0.19 M
V(KOH) = 35 mL
mol(HClO) = M(HClO) * V(HClO)
mol(HClO) = 0.19 M * 50 mL = 9.5 mmol
mol(KOH) = M(KOH) * V(KOH)
mol(KOH) = 0.19 M * 35 mL = 6.65 mmol
We have:
mol(HClO) = 9.5 mmol
mol(KOH) = 6.65 mmol
6.65 mmol of both will react
excess HClO remaining = 2.85 mmol
Volume of Solution = 50 + 35 = 85 mL
[HClO] = 2.85 mmol/85 mL = 0.0335M
[ClO-] = 6.65/85 = 0.0782M
They form acidic buffer
acid is HClO
conjugate base is ClO-
a = 4*10^-8
pKa = - log (Ka)
= - log(4*10^-8)= 7.398
use:
pH = pKa + log {[conjugate base]/[acid]}
= 7.398+ log {7.824*10^-2/3.353*10^-2}
= 7.766
4)when 50.0 mL of KOH is added
Given:
M(HClO) = 0.19 M
V(HClO) = 50 mL
M(KOH) = 0.19 M
V(KOH) = 50 mL
mol(HClO) = M(HClO) * V(HClO)
mol(HClO) = 0.19 M * 50 mL = 9.5 mmol
mol(KOH) = M(KOH) * V(KOH)
mol(KOH) = 0.19 M * 50 mL = 9.5 mmol
We have:
mol(HClO) = 9.5 mmol
mol(KOH) = 9.5 mmol
9.5 mmol of both will react to form ClO- and H2O
ClO- here is strong base
ClO- formed = 9.5 mmol
Volume of Solution = 50 + 50 = 100 mL
Kb of ClO- = Kw/Ka = 1*10^-14/4*10^-8 = 2.5*10^-7
concentration ofClO-,c = 9.5 mmol/100 mL = 0.095M
ClO- dissociates as
ClO- + H2O -----> HClO + OH-
0.095 0 0
0.095-x x x
Kb = [HClO][OH-]/[ClO-]
Kb = x*x/(c-x)
Assuming x can be ignored as compared to c
So, above expression becomes
Kb = x*x/(c)
so, x = sqrt (Kb*c)
x = sqrt ((2.5*10^-7)*9.5*10^-2) = 1.541*10^-4
since c is much greater than x, our assumption is correct
so, x = 1.541*10^-4 M
[OH-] = x = 1.541*10^-4 M
use:
pOH = -log [OH-]
= -log (1.541*10^-4)
= 3.8122
use:
PH = 14 - pOH
= 14 - 3.8122
= 10.1878
5)when 60.0 mL of KOH is added
Given:
M(HClO) = 0.19 M
V(HClO) = 50 mL
M(KOH) = 0.19 M
V(KOH) = 60 mL
mol(HClO) = M(HClO) * V(HClO)
mol(HClO) = 0.19 M * 50 mL = 9.5 mmol
mol(KOH) = M(KOH) * V(KOH)
mol(KOH) = 0.19 M * 60 mL = 11.4 mmol
We have:
mol(HClO) = 9.5 mmol
mol(KOH) = 11.4 mmol
9.5 mmol of both will react
excess KOH remaining = 1.9 mmol
Volume of Solution = 50 + 60 = 110 mL
[OH-] = 1.9 mmol/110 mL = 0.0173 M
use:
pOH = -log [OH-]
= -log (1.727*10^-2)
= 1.7626
use:
PH = 14 - pOH
= 14 - 1.7626
= 12.2374
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commercial vinegar is a 5.00% by mass aqueous solution of ethanoic acid. what is the molarity of ethanoic acid in vinegar? you may assume that the density of vinegar is 1.00 g/ml.
The Molarity of the ethanoic acid in Vinegar is 0.83 M. This is calculated using the expression for molarity.
Molarity is used for expressing how much solute is present per unit volume of solution.
Molarity (M)=n / V,
where n is moles of solute and V is volume of solution in liters.
The mass percentage of ethanoic acid in vinegar is 5.00%.
This suggests that for 100 g of vinegar, 5 g of it is ethanoic acid and 95 g of it is water.
We also know that the molar mass of ethanoic acid is 60.052 g/mol.
let us consider 100 g of vinegar. For finding the molarity of ethanoic acid in vinegar, we need to find the number of moles of ethanoic acid and the volume of vinegar.
Moles of ethanoic acid in 100 g of vinegar,
n=Given mass of ethanoic acid / Molar mass of ethanoic acid
= 5 gram / 60.052 g/ mole
= 0.083 mole
so, the molarity of ethanoic acid is,
molarity = 0.083 mole / 0.1 L
= 0.83 M
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When 34.5 g of KClO3 decompose, how many grams of oxygen are produced?
(answer before Dec 12 preferred- )
Answer:
52.25 grams of oxygen are produced.
Explanation:
When 34.5 g of potassium chlorate (KClO3) decomposes, it produces oxygen gas according to the following chemical equation:
2 KClO3 -> 2 KCl + 3 O2
This means that for every 2 grams of potassium chlorate that decomposes, 3 grams of oxygen gas are produced. In the case of 34.5 grams of potassium chlorate, this would produce 3 * 34.5/2 = 52.25 grams of oxygen. Therefore, when 34.5 g of KClO3 decomposes, 52.25 grams of oxygen are produced.
what noble gas core would be used when writing the ground state electron configuration for magnesium (mg)?
The noble gas core that would be used when writing the ground state electron configuration for magnesium is Ne.
A noble gas that precedes the elements in the periodic table. We write the noble gas configuration by writing the valence electrons followed by the noble gas nucleus. They are called noble gases because they are very majestic and generally do not react to anything.
Noble gases are colorless odorless tasteless and non-flammable under normal conditions. They were called group 0 in the periodic table because they were believed to have zero valences, meaning that the atoms cannot combine with atoms of other elements to form compounds. It is very inert because the valence shell is filled.
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Which of the following combined elements will most likely form a covalent bond?
a. k and ci
b. h and o
c. ai and mg
d. k and na
Answer:
b. h and o are likely to form covalent bond