The acid dissociation constant of trimethyl acetic acid is . the pH of a solution of trimethyl acetic acid is 2.22.
the trimethyl acetic acid dissociates as :
HC(CH₃)₃CO₂ ---> C(CH₃)₃CO₂⁻ + H⁺
the concentration of acid Ca = 3.8 M
the acid dissociation constant expression is given as :
[ H⁺ ] = √Ca × Ka
= √3.8 × 9.33 × 10⁻⁶
= 5.9 × 10⁻³ M
pH = -log [ H⁺ ]
= - log (5.9 × 10⁻³)
= -log 5.9 - log 10⁻³
= - 0.77 + 3
= 2.22
The question is in complete the complete question is :
The acid dissociation constant Ka of trimethylacetic acid is 9.33 × 10⁻⁶ . calculate the pH of a 3.8 M solution of trimethylacetic acid. round your answer to decimal place.
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rank the speed of sound in the following substances from slowest to fastest: steel 25°C air, 50°C air, and water. defend your predictions using the kinetic theory of matter.
The speed of sound in given substances from slowest to fastest: 25°C air, 50°C air, water, steel.
What are sound waves?Sound can transmit through liquids, gases, solids, and plasma as longitudinal waves, these are also known as compression waves. Sound waves need a medium to travel so they can be propagated through solids as longitudinal and transverse waves.
Longitudinal sound waves exhibit alternating pressure deviations leading to compression and rarefaction, while transverse waves exhibit alternating shear stress perpendicular to the propagation path.
Waves can cause matter to move up and down but can not carry along with them. As the temperature of the air increases the molecules start to vibrate faster eventually the speed of the sound increase.
The speed of sound is lowest in gases, faster in water, and fastest in steel (solid).
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what is the difference between an ore vein and a disseminated deposit? which ones are easier to mine?
Ore veins and disseminated deposits are differ in terms of their size, shape, and distribution.
An ore vein is a large, continuous body of mineral deposits that are typically found in fractures or voids in rock formations. Ore veins are typically formed when minerals that are dissolved in water fill a void or crack in a rock formation. Ore veins are typically quite large and can be several meters in width and several kilometers in length. They are also typically found at depths of several hundred meters or more. Ore veins are generally easier to mine because they are more concentrated and can be more easily accessed through underground mining methods.
A disseminated deposit, on the other hand, is a type of mineral deposit that is dispersed or scattered throughout a larger rock formation. Disseminated deposits are usually smaller and less concentrated than ore veins and are typically found at shallower depths. They are often harder to mine because the minerals are not as concentrated and are more dispersed throughout the rock formation
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how many moles of chloride ions are there in a mixture of 2mol of barium chloride and 1 mol of pottassium chloride
The chloride ions in a mixture of 2mol of barium chloride and 1 mol of potassium chloride are 3 moles
What is Barium chloride?Generally, Barium chloride is an inorganic compound with the formula BaCl2. It is a white solid that is highly soluble in water. It is commonly used as a test for detecting the presence of sulfates in a solution and as a precursor to other barium compounds. Barium chloride is toxic if ingested, so it should be handled with caution.
There are a total of 3 moles of chloride ions in the mixture of 2 moles of barium chloride and 1 mole of potassium chloride.
Barium chloride contains 2 moles of chloride ions, and potassium chloride contains 1 mole of chloride ions, for a total of 2 + 1 = 3 moles of chloride ions.
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the provider has ordered an i.v. of 5% dextrose in lactated ringer's solution at 125 ml/hr. the i.v. tubing delivers 10 gtt/ml. how many gtt/min should fall into the drip chamber?
The amount of gtt/min that should fall into the drip chamber is given as follows:
20.8.
How to find the amount of gtt/min that should fall into the chamber?The amount of gtt/min that should fall into the chamber is found applying the proportions considering the amounts given in the problem.
The provider has ordered an i.v. of 5% dextrose in lactated ringer's solution at 125 ml/hr, and the i.v. tubing delivers 10 gtt/ml, hence the amount of gtt per hour is obtained as follows:
gtt/hr = 125 x 10 = 1250.
An hour is composed by 60 minutes, hence, applying this proportion, the amount of gtt/min that should fall into the drip chamber is calculated as follows:
gtt/min = 1250/60 = 20.8.
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An inflatable toy starts with 1.05 moles of air and a volume of 5.17 liters. When fully inflated, the volume is 8.00 liters. It the pressure and temperature inside the toy don't change, how many moles of air does the toy now contain?
1.62 moles of air the toy now contain. At STP, moles can be converted to gas volume and gas volume to moles using molar volume.
How to calculate no of moles ?An experimental gas law known as Avogadro's law or Avogadro-hypothesis Ampère's connects the volume of a gas to the amount of gas material present. The law is an instance of the ideal gas theory.
At constant temperature and pressure, volume is directly proportional to the number of moles of the gas.
The formula used for solving this type of problems is:
v1 / v2 = n1/ n2
let's plug in the given values in the formula:
5.17 / 8.00 = 1.05 m / n2
n2 = 8.00 * 1.05 / 5.17
n2 = 1.62 moles
So, the toy contains 1.62 moles of air when it's volume is 8.00 Liter.
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Luke investigated the heating of water. He predicted that the rise in temperature would
depend on the volume of water.
The diagram shows the apparatus he used.
a. Why did Luke need to know the temperature of the water at the beginning and at the
end of the experiment?
Answer:
Explanation:
When Luke stirs the water, the particles from bottom to top and vice-versa, and hence the heat is transferred to all the water molecules.
The mode of transfer of heat here is convection.
When he stirs water then the water molecules from the top ( away from the flame ) travel to the bottom ( towards the flame ) and hence water gets heated uniformly leading to a good observation.
Due to uniform heating of water which leads to good observations.
what volume (in liters) would the gas occupy at a pressure of 1.11 atm if its temperature remained unchanged?
The volume occupied by the gas if the pressure changes to 0.980 atm is 2.77 L.
given that :
pressure P1 = 1.11 atm
volume V1 = 2.45 L
pressure P2 = 0.98 atm
volume V2 = ?
according to the ga law :
P1 V1 = P2 V2
solving all the value in the formula , we get
1.11 × 2.45 = 0.98 × V2
V2 = 2.77 L
Thus, A gas occupies a volume of 2.45 L at a pressure of 1.11 atm. the volume will the gas occupy if the pressure changes to 0.98atm and the temperature remains unchanged. is 2.77 L.
The question is incomplete the complete question is :
A gas occupies a volume of 2.45 L at a pressure of 1.11 atm. What volume will the gas occupy if the pressure changes to 0.98 atm and the temperature remains unchanged.
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the enthalpy of sublimation for a particular compound at 25.0 c is 32.4 kj/mol. the enthalpy of fusion for this compound at its melting point is 10.4 kj/mol. calculate the enthalpy of vaporization for this compound.
The enthalpy of vaporization for this compound is 22.0 kJ/mol.
What is vaporization?Vaporization is a process in which a liquid or solid is transformed into a gaseous state. It occurs when molecules in the liquid or solid absorb enough energy to break their intermolecular bonds and become a gas. This process can be carried out either through the application of heat or pressure, or through a process known as sublimation, which occurs when a solid is exposed to a vacuum.
ΔHₙ = ΔHₓ - ΔHₐ
Where, ΔHₙ = Enthalpy of vaporization
ΔHₓ = Enthalpy of sublimation (32.4 kj/mol)
ΔHₐ = Enthalpy of fusion (10.4 kj/mol)
ΔHₙ = 32.4 - 10.4
ΔHₙ = 22.0 kJ/mol
The enthalpy of vaporization for this compound is the difference between the enthalpy of sublimation and the enthalpy of fusion. Therefore, the enthalpy of vaporization for this compound is 22.0 kJ/mol.
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g two nuclei of 40ca (atomic number 20) undergo fusion to form a nucleus of 80 zr (atomic number 40). the total binding energy of 40ca is b. what would be the best estimate for the total binding energy of 80 zr?
The total binding energy of 80Zr is therefore approximately 4.58MeV.
What is isotopes?An isotope is an atom of a particular element that has a different number of neutrons than other atoms of that same element. This difference in the number of neutrons causes the isotopes to have different atomic masses. Isotopes of an element can be either stable or unstable. Stable isotopes are not radioactive and do not decay, while unstable isotopes are radioactive and undergo radioactive decay.
The total binding energy of 80Zr can be estimated using the mass defect of the two isotopes. According to the semi-empirical mass formula, the binding energy of a nucleus is related to its mass defect. The mass defect of the two nuclei can be calculated by subtracting the mass of the separate nuclei from the mass of the combined nucleus.
The mass of 40Ca is 39.96259 amu and the mass of 80Zr is 79.91652 amu. The combined mass of the two nuclei is 119.87911 amu.
The mass defect of the combined nucleus is therefore 119.87911 - 39.96259 - 79.91652 = 0.005 amu,
or 0.005 x 931.5 MeV/amu = 4.58MeV.
The total binding energy of 80Zr is therefore approximately 4.58MeV.
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Which element in group iia will have the highest melting temperature?
Answer:
Tungsten
Explanation:
Tungsten is a steel-gray or silver-white metal with high hardness, high melting point, and resistance to air erosion at room temperature. As a refractory metal (generally, the melting point is higher than 1650℃) with the highest melting point, it has good high-temperature strength.
Which scientist help developed the current model of the atom which states that electrons are located in regions known as orbitals or electron clouds?
Neil Bohr is the scientist help developed the current model of the atom which states that electrons are located in regions known as orbitals or electron clouds.
The current model of the atom, which states that electrons are located in regions known as orbitals or electron clouds, is known as the quantum mechanical model of the atom. This model was developed through the contributions of several scientists, including:
1. Niels Bohr: Bohr developed a model of the atom in which the electrons were confined to specific energy levels, or shells, around the nucleus. This model was able to explain many of the observed properties of atoms, such as the emission and absorption spectra of light.
2. Wolfgang Pauli: Pauli proposed the existence of a new type of particle, called the electron spin, which could explain the observed properties of atoms.
3. Erwin Schrödinger: Schrödinger developed a mathematical equation, known as the Schrödinger equation, which could be used to describe the behavior of particles, including electrons, in atoms.
4. Paul Dirac: Dirac developed a mathematical equation, known as the Dirac equation, which could be used to describe the behavior of particles, including electrons, in atoms. This equation incorporated the principles of both quantum mechanics and special relativity, and it predicted the existence of antimatter.
Overall, these scientists and their work contributed significantly to the development of the current model of the atom, which is based on the principles of quantum mechanics.
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what is the maximum amount of flammable liquids that can be stored outside of a rated flammable cabinet in a laboratory?
The maximum amount of flammable liquids that can be stored outside of a rated flammable cabinet in a laboratory is 25 number of gallons.
To make certain flammable drinks are remoted from incompatible substances, they need to simplest be saved in a flammable cupboard this is used simplest for the garage of Class three Flammable Liquids. Extra care should be taken now no longer to take flammable drinks into regions of the laboratory which are the usage of incompatible substances.
The most quantity of flammable drinks that you could save in a single flammable cupboard is primarily based totally at the chemical's Flash Point and Boiling Point. No extra than 60 gallons of a Category 1, 2 or three flammable liquid or a hundred and twenty gallons of a Category four flammable liquid can be saved in a Flammable Safety Cabinet.No extra than 25 gallons of flammable drinks will be saved in a room outdoor of an permitted garage cupboard.
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identify the initial and final states if an electron in hydrogen emits a photon with a wavelength of 656 nm .
The initial and final states if an electron in hydrogen emits a photon with a wavelength of 656 nm is n = 3 to n = 2.
given that :
wavelength of the photon emitted λ = 656 nm = 656 × 10⁻⁹ m
the energy of the photon is given as :
E = hc / λ
= (6.626 × 10⁻³⁴ × 3 ×10⁸ ) / 656 × 10⁻⁹
= 3 × 10⁻¹⁹ J = 1.9 eV
En = - 13.6 / n² eV
where n = 1,2,3 ....
1) n = 2 to n = 1
E2 - E1 = - 13.6 eV ( 1 / 4 - 1/ 1)
= 10.2 eV
2) n = 3 to n = 2
E3 - E2 = -13.6 eV ( 1/3² - 1/ 2² )
= 1.9 eV
Thus the initial and the final states are n = 3 to n = 2.
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the natural abundance of calcium in the earth's crust is 3.4% by mass. how many calcium atoms are present in a 1.50 g sample of the earth's crust?
If calcium makes up 3.4% by mass of Earth's crust, the grams of calcium present if a sample of Earth's crust has a mass of 1.5 g is 0.051 g.
How to calculate mass?
The mass of an element in a sample can be calculated by multiplying the percent abundance of that element by the mass of sample.
According to this question, calcium makes up 3.4% by mass of Earth's crust. If a sample of Earth's crust has a mass of 1.5 g, the mass of calcium present can be calculated as follows:
mass of calcium = 3.4/100 × 1.5 g
mass of calcium = 0.051 g
Therefore, if calcium makes up 3.4% by mass of Earth's crust, the grams of calcium present if a sample of earths crust has a mass of 1.5 g is 0.051 g.
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what atomic or hybrid orbitals make up the sigma bond between and in acetic acid, ? ( is the second carbon in the structure as written. is the first oxygen in the structure as written.) orbital on orbital on what is the approximate bond angle? angle
(a) sp2- hybrid orbital of C1 and p-orbital of O1 , because, central atom i.e. carbon has sp2-hybridization and in surrounded oxygen atom last electrons enters in p-orbital. (b) 1200 bond angle, because shape is trigonal planar.
Atomic orbitals are generally specific through a mixture of numerals and letters that constitute precise residences of the electrons related to the orbitals—for example, 1s, 2p, 3d, 4f. The numerals, referred to as primary quantum numbers, imply strength degrees in addition to relative distance from the nucleus. The simple names s orbital, p orbital, d orbital, and f orbital refer to orbitals with angular momentum quantum number ℓ = 0, 1, 2, and 3 respectively.
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Item 4
What is the ratio of the balanced coefficients of this reaction?
(NH:)N +
_S --> (NH₂)₂S+ N₂
The balanced equation of the given reaction is 4(NH:)N +_S --> (NH₂)₂S+ 2N₂. And the ratio of coefficient is 4:1:1:2.
Chemical equations are symbols and chemical formulas that depict a chemical reaction symbolically.A chemical equation that is balanced has equal amounts of each element's atoms on both sides of the equation and conserves mass.You can solve equations on your own by adhering to some basic guidelines:Verify if the equation's formulas are all accurate.Focus on just one element at a time.In balancing, huge numbers are added. A chemical formula cannot have any little numbers changed.Recheck each component, then repeat step 3 as necessary.For more information on balanced equation kindly visit to
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need help asap please
I doiont know tbh
Explanation:
sulfur hexafluoride gas is collected at in an evacuated flask with a measured volume of . when all the gas has been collected, the pressure in the flask is measured to be . calculate the mass and number of moles of sulfur hexafluoride gas that were collected. be sure your answer has the correct number of significant digits.
Sulfur hexafluoride gas has a mass of 2.8 g and a molecular weight of 0.019 when it is collected at in an evacuated flask with volume of 5.0L
To calculate the moles of sulfur hexafluoride gas, we use the equation given by ideal gas: PV =nRT
Given Pressure of sulfur hexafluoride (P) = 0.090 atm
Volume of the sulfur hexafluoride gas (V) = 5.0 L
Gas constant (R) = 0.0821
Temperature of sulfur hexafluoride gas (T) = 14C+273 = 287K
n = PV/RT = 0.090x5/0.0821x287 = 0.019mol
To calculate mass n = given mass/Molar mass
Molar mass of sulfur hexafluoride = 146.0 g/mol
mass = nxM = 0.019x146 = 2.8g
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complete question: Sulfur hexafluoride gas is collected at 14.0°C in an evacuated flask with a measured volume of 5.0L. When all the gas has been collected, the pressure in the flask is measured to be 0.090atm . Calculate the mass and number of moles of sulfur hexafluoride gas that were collected. Be sure your answer has the correct number of significant digits.
what has very good electrical conductivity
Which statement could be a specific theory
An explanation of a hypothesis that has been repeatedly tested in experiments and found to be correct is referred to be a scientific theory.
What is specific theory?Specific theory is defined as the theories that are limited to certain populations or specific sectors of practice, that concentrate on specific nursing phenomena, and that reflect clinical experience.
'A scientific theory is a well-supported explanation of some part of the natural world, based on a body of facts that have been repeatedly proven via observation and experimentation,' according to the Oxford Dictionary.
Thus, an explanation of a hypothesis that has been repeatedly tested in experiments and found to be correct is referred to be a scientific theory.
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What mass of water is produced when 5.0 mol o2 is produced by this reaction?
Answer:
39.0
Explanation:
Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients.
N₂(g) + H₂(g) → NH3(g)
Hello,
I hope you and your family are staying safe and healthy!
To balance this chemical equation, we need to make sure that there is the same number of atoms of each element on both sides of the arrow.
We can start by looking at the nitrogen atoms. There is one nitrogen atom on the left side of the arrow, but there are two nitrogen atoms on the right side of the arrow. To balance the equation, we can add a coefficient of 2 in front of N₂ on the left side of the arrow:
2N₂(g) + H₂(g) → NH3(g)
Next, we can look at the hydrogen atoms. There are two hydrogen atoms on the left side of the arrow, but there is only one hydrogen atom on the right side of the arrow. To balance the equation, we can add a coefficient of 3 in front of NH3 on the right side of the arrow:
2N₂(g) + H₂(g) → 3NH3(g)
Now the equation is balanced, with two nitrogen atoms and two hydrogen atoms on each side of the arrow. The smallest possible whole number stoichiometric coefficients are 2 for N₂ and 3 for NH3.
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Happy Holidays!
a government agency recommends that the amount of arsenic in drinking water should not be above 0.01 ppm. at this concentration, how many grams of arsenic would you expect to find dissolved in 1000 ml of pure water?
The formula for PPM =100 /1,000,000=0.01 PPM = 100 / 1 , 000 , 000 = 0.01 . i.e concentrations of arsenic should be less than 0.01 *1000 therefore it should be less than 10 ml for 1000ml of water.
This stands for "parts per million" and can alternatively be written as mg/L (milligrams per liter). The mass of a chemical or contamination per volume of water is the unit of measurement here. On a lab report, ppm or mg/L both signify the same thing. It provides information about a substance's density when it is dissolved in water. Examples include total alkalinity, calcium hardness, and free chlorine. A substance has a PPM of 1 if it makes up one millionth of the entire amount of water.
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How does the solubility of a gas in a solvent depend on pressure and temperature?
The solubility of a gas is directly proportional to the pressure and proportional to the temperature.
As we increase the pressure of a gas its collision frequency increases hence solubility increases as we decreases the pressure the solubility decreases. Collision frequency is defined as the collision of atoms on increasing pressure atoms start moving from one place to another. The relationship pressure is linear with solubility. It is defined by Henry's law.
The effect of temperature depends on the nature of solute and solvent.
Basically, as we increase the temperature in gas phase solubility also increases.
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What is the question Ghez and her graduate students are still trying to answer?
The question Ghez and her graduate students are still trying to answer is -why there are more youthful stars than older ones.
When was the black hole found by Andrea Ghez?
The orbits of stars racing past the black hole were not independently mapped until 2000 by Andrea Ghez and Reinhard Genzel. These orbits demonstrated that the hidden object could not be anything else because of its enormous mass and small size.
The stars included several newcomers. Near a black hole, new stars shouldn't exist. Theoretically, any cloud of gas and dust would be shattered before it could develop into a star. The existence of such young stars continues to elude Ghez and other astronomers.
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if the reaction yields 21.1l of nitrogen gas what mass of nan3 in grams would be required to produce this volume at stp?
if the reaction yields 21.1l of nitrogen gas, 40.81g mass of nan3 in grams would be required to produce this volume at stp
mass of NaN3 (g) = moles of NaN3 (ma) x molar mass of Na N3 (g/mol) = 0-678 mol 65 g/mol =40.81g. A chemical compound's molar mass is described as the weight of a sample of that chemical divided by the quantity of substance in that sample, which is the quantity of moles in that sample, evaluated in moles. The molar mass of a substance is a mass property, not a molecular property. It is the connection between pressure, volume, moles, and temperature. is the volume that one mole of the a chemical substance or a chemical compound takes up. As a result, at STP, the molar volume of a gas is 22.4 litres.
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A 2-kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving bat this speed and in this direction? Explain.
Answer: 8N (8 kg/ms")
Explanation: F= M*A
F= (2KG)*(4/MS") = 8N
which of the following is an intensive property? A. length, B. 45.0 C. Brittle D. 3.5 cm
The option that is an intensive property is brittle (option C).
What is an intensive property?Intensive property of a material is that property that does not depend on the amount or shape of the material, a property of the material at a specific point in space.
The properties of matter that do not depend on the size or quantity of matter in any way are referred to as an intensive property of matter.
Intensive properties of matter include the following: temperature, density, colour, melting and boiling point, etc., because they will not change with a change in size or quantity of matter.
Therefore, brittleness is an intensive property of a material.
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The average body temperature is 98.6 degrees F or 37 degrees C. Based on what you know about temperature loss since time of death calculate the body temperature for each hour up to 24 hours after death (starting with 1 hour after death)
Rectal temperature is deducted from the average body temp of 98 farenheit since the algorithm estimates that body loses 1.5 degrees every hour.The period since death is roughly calculated by dividing the differences between the two by 1.5.
How is the death date determined?The Glaister Equation determines the number of hours that elapse after dying as a linear model of the decedent's body temperature.(98.7 degrees Fahrenheit - the deceased's body temperature).
How soon after death does the corpse become cold?Skin and bone cells can continue to function for several days.A human body takes about 12 hours so cool to the feel & 24 hours too cool completely.Following three hours, rigor mortis begins and lasts for 36 hours following death.
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cluster decay is a type of radioactivity like alpha decay, except instead of spitting out a helium nucleus, it expels something bigger. what is the atom resulting from uranium-235 (u) emitting a magnesium-28 (mg) nucleus? (write your answer in the standard u-235 format.)
A radioactive atom emits a cluster of neutrons and protons-235 heavier than an alpha particle in a process known as cluster decay.
Cluster decay, also known as heavy particle radioactivity or heavy ion radioactivity, is a very uncommon form of nuclear decay in which an atomic nucleus generates a small "cluster" of neutrons and protons, more than in an alpha particle but less than a typical binary fission fragment. The cluster size is also produced by ternary fission into three fragments. When the parent nucleus loses protons, it becomes the daughter nucleus, which has an atomic number Zd = Z + Ze and a mass number Ad = A Ae, where Ae = Ne + Ze. [1] For instance
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