If we use the compressed air to dispense keg on a system where gas comes in contact with the beer, we get the ton of foam.
The keg is round metal or the wooden container that is used to store the beer. The compressed air is the form of the stored energy. This energy is used to function the machinery equipment or the process. The compressed air is used in the manufacture of some devices. The compressed air is a gas under the high pressure.
Thus, we get ton of foams if compressed air to dispense keg on a system where gas comes in contact with the beer.
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which of the following chemical equations are balanced when solid calcium carbonate decomposes into solid calcium oxide and gaseous carbon dioxide.
identify the answer choice that lists 62co, 64ni, 61cu, and 64zn in order of increasing number of neutrons
62Co, 61Cu, 64Ni, 64Zn . the answer choice that lists 62co, 64ni, 61cu, and 64zn in order of increasing number of neutrons The number of neutrons equals.
neutrons the difference between the atomic mass number (M) and the atomic number (Z). Copper has an atomic mass of 63.5 and an atomic number of 29. - The atomic number of a neutral element is always equal to the amount of electrons or protons present. As a result, the copper atom has 34 neutrons.Cu-61 < Zn-64 < Co-62 < Ni-64. the answer choice that lists 62co, 64ni, 61cu, and 64zn in order of increasing number of neutrons The number of neutrons equals. Copper exists in nature primarily as two isotopes: 6329Cu and 6529Cu. An atom's atomic number is equal to the number of protons in its nucleus or the number of electrons in an electrically neutral atom. A sodium atom, for example, contains 11 electrons and 11 protons. As a result, the atomic number of the Na atom Equals number.
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As the number of oxygen atoms increases in any series of oxygen acids, such as HXO, HXO₂, HXO3, which of the following is generally true? A: the acid strength varies unpredictably
B: the acid strength decreases only if X is a nonmetal
C: the acid strength decreases only if X is a metal
D: the acid strength decreases whether X is a nonmetal or a metal
E: the acid strength increases
The acid strength increases as the number of oxygen atoms increases in any series of oxygen acids, such as HXO, HXO₂, HXO3. Thus, option E is correct.
What is acid strength?According to Bronsted-Lowry, the distinction between an acid and a base is based solely on their propensity to lose and accept H+ ions or protons. The ability of an acid to lose protons or H+ ions is measured as acid strength. The acid is stronger the more readily H+ can be lost or removed.
Base strength calculates a base's capacity to take in protons or H+ ions. The stronger the base, the easier it is for H+ to be added or accepted. Let's say that an acid has the chemical symbol HA. H+, the proton or cation, and A-, an anion, are the products of its dissociation. A chemical equation provides it as follows.
HA → H+ + A–
As the oxidation no. increases the acidity of molecules increase.
And on increasing no. of oxygen there increase in oxidation number .thus acid strength increases.
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Which of the following is a second period element that is a dense covalent network in its standard state?
a. Carbon(s) = graphite, diamond
b. metal(s) = graphite, diamond
c. iron(s) = graphite, diamond
d. copper(s) = graphite, diamond
according to second period element that is a dense covalent network in its standard state. The correct answer is a.
Carbon(s) = graphite, diamond.
Carbon is a second period element and is found in the second row of the periodic table. In its standard state, it exists as two allotropes, graphite and diamond, both of which are covalent network solids.
Graphite is a soft, slippery form of carbon, composed of layers of hexagonal arrays of carbon atoms that are held together by weak van der Waals forces. Diamond is the hardest known naturally occurring mineral, composed of a three-dimensional network of covalently bonded carbon atoms.
Option b, c and d are not correct because all of them are metals and they don't form covalent network in their standard state.
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FILL IN THE BLANK. j. j. thomson used to measure the of a cathode ray particle. thomson's experiments are important because they showed that the is clearly composed of . the millikan experiment is important because it determined the of an . using thomson's and millikan's , the of an was determined. rutherford's experiment is important because it clearly demonstrated that the is mostly . rutherford's results also showed that most of the atom's is located in the , which has a very .
J.J. Thomson used magnetic and electric fields to measure the mass to charge ratio of a cathode ray particle.
What is a magnetic field?
Magnetic fields surround magnetized materials and are created by electric currents, such as those used in electromagnets, and time-varying electric fields. Since both the strength and direction of the magnetic field can change with location, it is described mathematically by a function assigning a vector to each point in space, called a vector field.To know more about magnetic field, click the link given below:
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what molar ratio of hpo22 4 to h2po2 4 in solution would produce a ph of 7.0? phosphoric acid (h3po4), a triprotic acid, has three pka values: 2.14, 6.86, and 12.4. hint: only one of the pka values is relevant here.
The acid dissociation constant Ka's negative logarithm, or pKa value, serves as a gauge of acid strength.
The ratio-proportion formula is what?A: b a/b is the ratio formula, which may be used to calculate any two values. A:b::c:da:b::c:da, on the other hand, is how the percentage formula is written. The conjugate base to acid ratio of phosphoric acid is given by Se. The concentration of hydrogen ions in a substance's solution determines its pH; the lower the pH value, the higher the concentration.The acid dissociation constant Ka's negative logarithm, or pKa value, serves as a gauge of acid strength.The sum of the market share percentages owned by the most specified number of companies within an industry is used to determine the concentration ratio.To learn more about ratio-proportion refer to:
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the particle's change in speed over the distance d will be the change in speed when it had a mass equal to m .
According to Newton's second law of motion, force is equal to mass multiplied by acceleration (F = ma). Therefore, if the mass of the particle remains constant, the change in speed will be the same regardless of the mass of the particle.
In other words, the change in speed over the distance d will be the same for a particle with a mass of m as it would be for a particle with a different mass. This is because the force acting on the particle will be the same in both cases, and the only variable that changes is the mass of the particle, which does not affect the change in speed.
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A chemist adds 290.0mL of a 2.63/molL sodium chloride NaCl solution to a reaction flask. Calculate the mass in grams of sodium chloride the chemist has added to the flask. Be sure your answer has the correct number of significant digits.
The first step in solving this problem is to determine the number of moles of sodium chloride that were added to the flask. To do this, we can use the formula:
moles = (concentration in mol/L) x (volume in L)
We can convert the volume from milliliters to liters by dividing by 1000:
moles = (2.63 mol/L) x (0.29 L)
moles = 0.7637 mol Once we know the number of moles, we can use the molar mass (molar weight) of sodium chloride to find the mass in grams.
mass = moles x molar mass
mass = 0.7637 x 58.44 g
mass = 44.7 g
So the chemist has added 44.7 g of sodium chloride to the reaction flask. The answer has the correct number of significant digits, which are the digits that are certain in the original measurements plus one uncertain digit.
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identify the polyatomic ion in each of these ionic compounds. write out the name and formula of the ions including their charges.
The name and formula of the ions including their charges are
CO₃²⁻ = carbonateOH⁻ = hydroxideNH₄¹⁺ = ammoniumA polyatomic ion, also known as a molecular ion, is a covalently bound set of two or more atoms or a metal complex that behaves as a single unit and has a net charge that is more than zero. Depending on the meaning, the term molecule may or may not be used to refer to a polyatomic ion. In Greek, the word poly- means "many," however even ions of two atoms are usually characterised as polyatomic.
In the past, a polyatomic ion was sometimes referred to as a radical (or less commonly, as a radical group). In modern usage, the term radical refers to a variety of free radicals, which are organisms with an unpaired electron that do not need to be charged.
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A student gets into their parent’s car to go to school. They connect their phone via Bluetooth to the car speakers and play their favorite songs very loudly. Explain in depth how this is possible without any cords being present. Also, explain how the body is able to hear the sound.
Pls awnser the question please, this is a science question FYI.
Answer:
Look and the explanation please :) Also good luck on you final. Also Hedy lamarr created wi-fi with helps bluetooth
Explanation:
The tech uses a thing called a radio transmitter. It also uses a reciever to send the sound from the phone to the speaker. For the speaker to hear this audio a thing called a sound wave occurs. The sound wave enters the outer part of the ear then it travels through the narrow part in the ear. It is known as the canal. The sound then leads to the eardrum. The sound makes the eardrum vibrate. This is why its called a ear "drum". The sound waves then sends the vibrations to specifically three bones in the center of the ear.
Based on their activation energies and energy changes and assuming that all collision factors are the same, which of the following reactions would be fastest in the reverse direction? a. Ea = 45 kJ/mol; ΔE = -25 kJ/mol b. Ea = 35 kJ/mol; ΔE = -10 kJ/mol c. Ea = 55 kJ/mol; ΔE = 10 kJ/mol
The reverse reaction occurs more quickly the larger the activation energy. Since Ea=Ea3 = 54 kJ/mol and E=E3 = 8 kJ/mol, the reaction with the fastest rate of reaction is the latter. C is the fastest reaction because it has the lowest Ea (34 kJ/mol).
The lowest amount of energy required for reactants to collide in order for a chemical reaction to occur is referred to as activation energy. The reverse reaction occurs more quickly the larger the activation energy.
Since Ea=Ea3 = 54 kJ/mol and E=E3 = 8 kJ/mol, the reaction with the fastest rate of reaction is the latter (Option A). K will only depend on Ea if A and T are constant for all reactions.
[2] states that the larger the k, the smaller the Ea. The larger the k, the higher the r, claims [1]. And the reaction is quicker when r is higher.
Overall, C is the fastest reaction because it has the lowest Ea (34 kJ/mol).
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Which of the molecules listed below can form hydrogen bond? For which of the molecules would dispersion forces be the only intermolecular force? Give reasons for answer.A. H2B. NH3C. HCI D. HF
the molecules listed below can form hydrogen bond and the molecules would dispersion forces be the only intermolecular force.
A. H2 is a molecule that does not have any polar or charged atoms, so it cannot form hydrogen bonds.
B. NH3 is a molecule that can form hydrogen bonds. The nitrogen atom has a partial positive charge and the hydrogen atoms have partial negative charges, allowing for the formation of hydrogen bonds between NH3 molecules.
C. HCl is a molecule that has a polar covalent bond between hydrogen and chlorine atoms. However, the bond polarity is not strong enough to form hydrogen bonds, so dispersion forces would be the only intermolecular force.
D. HF is a molecule that can form hydrogen bonds. The hydrogen atom has a partial positive charge and the fluorine atom has a partial negative charge, allowing for the formation of hydrogen bonds between HF molecules.
In summary, NH3 and HF have the ability to form hydrogen bonds because they possess polar covalent bonds between atoms of different electronegativity. H2 and HCl do not form hydrogen bonds because they do not have polar covalent bonds, and the only intermolecular force that act on them would be dispersion forces.
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which of the following describe how water mixes in a thermohaline current? select the two correct answers.
Cold water is submerged beneath warm water. Less salty water is submerged beneath saltier water. The two correct answers are as follows: explain how water combines in a thermohaline current.
The density of seawater increases as it grows saltier, and it begins to sink. Surface water is pulled in to replenish sinking water, which cools and salts sufficiently to sink. This initiates the deep-ocean currents that drive the global conveyer belt. Variations in water density generate deep currents, also known as thermohaline current circulation. As cold, dense water falls to the poles, these currents form. Over a 1000-year period, surface water flows to replenish sinking water, creating a conveyor belt-like effect of water round the planet. Cold water is submerged beneath warm water. Less salty water seeps beneath the surface.
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Predict the product of the reaction below. Assume m-CPBA is used in stoichiometric excess.
You must include stereochemistry, but only draw 1 stereoisomer, even if another is formed.
m-CPBA, CH2Cl2
Although stereochemistry is required, only draw one stereoisomer even if several are produced. m- CH2Cl2, CPBA.
What is stereochemistry?Chemistry's subdiscipline of stereochemistry examines and manipulates the relative spatial arrangement of atoms that make up molecules. The field of chemistry known as stereochemistry deals with "the study of the various spatial configurations of atoms in molecules." The methodical presentation of a particular area of science and technology, known as stereochemistry, usually necessitates a brief detour into the past.Because a drug's shape affects how it interacts with the many biological molecules (enzymes, receptors, etc.) that it comes into contact with in the body, stereochemistry is crucial to understanding how drugs work.The word "stereochemistry," which relates to chemistry in three dimensions, is derived from the Greek "stereos," which means solid.To learn more about stereochemistry refer to:
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T/F the nuclear receptor err cooperates with the cardiogenic factor gata4 to orchestrate cardiomyocyte maturation
Yes, due to the presence of ligands, nuclear hormone receptors are also in charge of binding hormones.
An intracellular steroid and thyroid hormone receptor are a type of protein called a nuclear receptor. Nuclear receptors and these hormones' interactions alter the pattern of gene expression, allowing for the transcription of some genes while silencing others. As a result, distinct proteins, enzymes, and RNA translation products are produced. Nuclear receptors have a direct connection to DNA and regulate the expression of some genes, which in turn controls the organism's growth, homeostasis, and metabolism. A typical nuclear receptor has the following domains: The transcriptional activation mechanism is contained in the amino-terminal activation domain, which has a very varied sequence (AF1). The major characteristic of the domain is the hiring of co-regulators.
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choose the compound below that contains at least one polar covalent bond, but is nonpolar. group of answer choices pocl3 pclbr4 pcl5 po2cl both b and c are nonpolar and contain a polar covalent bond.
CF4 is nonpolar as geometry of CF4 is tetrahedral; due to mutual cancellation of dipole moment. Thus option B is correct.
What are the compound that contains least polar covalent bond?A non polar molecule is one in which there is no separation of charge and the electrons are shared equally between the atoms.Out of the options given, only PCL5 contains at least one polar covalent bond but is nonpolar.POCL3 has a polar covalent bond between the oxygen atom and the chlorine atoms but is polar in nature.PCLBr4 and PO2Cl both contain polar covalent bonds but are polar in nature.In PCL5, the five chlorine atoms are symmetrically arranged around the central phosphorus atom, which cancels out any net dipole moment and results in a non polar molecule.To summarize, PCL5 is the compound that contains at least one polar covalent bond but is non polar.To learn more about covalent bonds refer:
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Complete question:
Which of the following molecules would have a higher boiling point? How do you know? i. CS or CO2? ii. Ozor Hz? ili. SiH, or SnH? 11. Based on the information in the following table, which of the molecules presented has the weakest intermolecular forces? Which has the strongest? Substance Boiling point (°C) -78 142 CH 3F CHCI СН Br CH! CCIA 4 42 לול
i. CS2, because it has stronger London dispersion forces, due to its larger molecular weight.
ii. Ozor Hz, because it has stronger dipole-dipole forces.
iii. SiH4, because it also has stronger London dispersion forces than SnH4.
The CH3F molecule has the weakest intermolecular forces, and the CHCl3 molecule has the strongest intermolecular forces.
What is dispersion forces?
Dispersion forces, also known as London forces, are a type of intermolecular force that is caused by the temporary dipole moments that result from the fluctuating distribution of electrons in molecules and other particles. They are the weakest intermolecular force, and are responsible for phenomena such as surface tension and viscosity.
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The law of mass action states that ___. Select all that apply.
A) a chemical system reaches a state where the concentrations of reactants are products is a constant ratio
B) for an equilibrium system K changes until it equals the value of Q
C) a chemical system reaches a state in which reactant concentrations equal product concentrations
D) equilibrium can be reached from any direction, i.e., by beginning with a mixture of reactants or products, or both
According to the law of mass action:A) chemical system reaches a state in which the concentrations of reactants and products are a constant ratio.B) For an equilibrium system, K varies until it equals Q.D) Equilibrium can be attained in any direction, i.e., by starting with a mixture of reactants, products, or both.
According to the law of mass action, the rate of a chemical reaction is proportional to the concentrations of the reactants. It also states that as a reaction proceeds, the concentrations of reactants decrease and the concentrations of products increase, until an equilibrium is reached. At equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction, and the concentrations of reactants and products remain constant. The equilibrium constant (K) is a value that describes the relative concentrations of reactants and products at equilibrium. It is determined by the stoichiometry of the reaction and the standard free energy change of the reaction. constant (K) is a value that describes the relative concentrations of reactants and products at equilibrium. It is determined by the stoichiometry of the reaction and the standard free energy change of the reaction.
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How many calories particles are there in 15.0 moles of helium atoms?
How do I even answer and draw this? Can someone answer this for me please
Grade 10 chemistry
The distinctive bluish-green color of the flame is brought about by copper.
Flame test: What is it?
Using each element's distinct flame emission spectrum (which may be impacted by the presence of chloride ion), a flame test is an analytical method used in chemistry to detect the presence of specific elements, primarily metal ions. The general color of flames is also influenced by temperature and oxygen availability. A sample of the element or compound needs to be heated up by a non-luminous flame in order to perform the test. The resulting flame's color must then be scrutinized.
Atoms from the sample are heated during evaporation for the experiment, and this heat causes the atoms to emit light.
Prior to the solid particles that have been finely divided
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using the solubility rules in your reference tables (page 6), which of the following reactions would occur? group of answer choices 3agno3 k3po4 --> ag3po4 3kno3 3cube 3 2alcl3 --> 3cacl2 2albr3 ca(no3)2 2hcl --> cacl2 2hno3 cabr2 2kno3 --> ca(no3)2 2kbr
3AgNO3 + K3PO4 ---> Ag3PO4 + 3KNO3 reactions would occur. because Ag3PO4 precipitate is produced. Ag3PO4 does not dissolve in water; instead, it precipitates out, unlike KNO3, CaCl2, HNO3, CuCl2, AlBr3, Ca(NO3)2, and KBr do.
All the specified reactions are double displacement reactions and among them that reaction will occur in which precipitate is generated. The following are the solubility principles for common ionic solids. When two rules seem to conflict with one another, the prior rule is used.
1. Group I element salts (Li+, Na+, K+, Cs+, Rb+) are soluble in water. The few exceptions to this rule are rare. Ammonium ion (NH4+) salts are also soluble in water.
2. Nitrate ion (NO3-)-containing salts are often soluble.
3. In general, salts containing Cl, Br, or I are soluble. Ag+, Pb2+, and (Hg2)2+ halide salts are significant exceptions to this norm. PbBr2, Hg2Cl2, and AgCl are hence insoluble.
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Read the Safety Data Sheet (SDS) (click the SDS icon below) of hydrogen peroxide to identify the type of eye protection recommended when handling this substance. SDS Select one: Safety glasses Tightly fitting safety goggles O Eyeglasses with safety shields O Any of the choices listed are adequate eye protection,
Any of the choices listed are adequate eye protection, depending on the situation. The SDS for hydrogen peroxide recommends safety glasses, tightly fitting safety goggles, or eyeglasses with safety shields.
What is the hydrogen peroxide?
Hydrogen peroxide is a colorless liquid that is a strong oxidizing agent. It is composed of two hydrogen atoms and two oxygen atoms, and it is usually found as a pale blue liquid. It is used as a disinfectant and bleaching agent, as well as in rocket fuel and in the production of various chemicals. Hydrogen peroxide is a powerful oxidizer and can cause damage to living cells if used improperly. It breaks down into water and oxygen when it is exposed to light or certain enzymes, making it a safe and effective disinfectant. It is also used in hair bleaching, teeth whitening, and stain removal.
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a solution has a [ag (aq)] of 0.01 m. the chloride concentration in solution is 1 x 10 -5 m. based on the following reaction, answer the following questions: agcl(s) ag (aq) cl - (aq), k sp
Based on the Ksp and the concentration of Ag+ ions in the solution, the concentration of chloride ions in the solution is not sufficient to reach equilibrium, meaning AgCl is not in a saturated state.
The reaction is the equilibrium of AgCl (s) dissolving in water to form Ag+ (aq) and Cl- (aq) ions:
AgCl (s) → Ag+ (aq) + Cl- (aq)
The equilibrium constant for this reaction is known as the solubility product constant (Ksp). The Ksp for AgCl is 1.8 x 10⁻¹⁰, which means that at equilibrium, the product of the concentrations of Ag+ and Cl- ions is 1.8 x 10⁻¹⁰.
Given that the [Ag+] in the solution is 0.01 M, we can use the Ksp and the [Ag+] to calculate the [Cl-]:
Ksp = [Ag+] [Cl-] = 1.8 x 10⁻¹⁰
[Cl-] = Ksp / [Ag+] = 1.8 x 10⁻¹⁰ / 0.01 = 1.8 x 10⁻⁹ M
This is much higher than the concentration of chloride ions in the solution, which is 1 x 10⁻⁵ M. Therefore, the solution is not at equilibrium and AgCl is not in a saturated state.
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What is the most appropriate action if a chemical has just splashed on a person's face in lab?
The first thing is to wipe it off or wash it with an excess of water so that it can neutralize the action of a chemical.
While working in the lab, it should be taken care that you are wearing gloves, and eye goggles during the experiment. In case you are working with chemicals that release gases then wear masks properly. If your face comes in contact with the harmful chemicals then wash it with a lot of water so that it can not be absorbed into your skin and does not cause a major injury after that immediately go to the near hospital to confirm the reaction of the chemical and use their recommendations for better healing.
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which of the following is not allowed in lab? group of answer choices cell phones drink backpacks mixing chemicals without specific instruction from the lab instructor students who are not enrolled in the lab section eye glasses open flame food
The choices cell phones drink backpacks mixing chemicals without specific instruction from the lab instructor students who are not enrolled in the lab section eye glasses open flame food.
What is the chemical ?
Chemistry is the science of matter, particularly its properties, structure, composition, behavior, and the changes it undergoes during chemical reactions. It is a branch of physical science that studies the composition, structure, properties, and reactions of matter. Chemistry is concerned with the properties of atoms and molecules and how they interact with each other to form new substances. The study of chemistry focuses on the interactions of atoms and molecules, and their behavior in different environments. Chemistry is used to understand the composition of materials and the reactions between them, as well as their physical and chemical properties. Chemistry is also used to produce and analyze chemical products, such as medicines, food, and consumer products. It is also used to develop new materials and technologies, such as semiconductor materials, pharmaceuticals, and green energy sources.
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why do they look different? Do I remember both?
equal numbers of moles of h2(g), ar(g), and n2(g) are placed in a glass vessel at room temperature. if the vessel has a pinhole-sized leak, which of the following will be true regarding the relative values of the partial pressures of the gases remaining in the vessel after some of the gas mixture has effused?
The following will be true regarding the relative partial pressures of the gases remaining in the vessel after some of the gas mixtures have effused. Pressure H₂ < Pressure N₂ < Pressure Ar
Let us first write the formula for Graham's law of diffusion/effusion to answer this question.
r ∝ 1/√M
Where;
r denotes the diffusion/effusion rate.
M denotes molar mass.
In effusion, a barrier with very small holes usually prevents the gas from rapidly expanding into a new volume. As a result, the heavier the gas, the slower the effusion rate; the lighter the gas, the faster the effusion rate.
Now, the heavier gas has a higher pressure than the lighter ones.
The molar masses of the following gases are as follows:
Molar mass of H₂ = 2.016 g/mol
Molar mass of Ar = 39.95 g/mol
Molar mass of N₂ = 28.0134 g/mol
The rate of effusion is inversely proportional to the molar mass, according to the effusion equation.
As a result, the higher the molar mass, the lower the effusion rate and, as a result, the higher the pressure because it is a heavy gas.
As a result, Ar has the greatest molar mass and will experience the greatest pressure.N₂ comes next, followed by H₂.
If a container is filled with more than one gas, each gas exerts pressure on the container. The partial pressures of any gas within the container are referred to. Partial pressure is the pressure exerted by one of the gases in the mixture if it occupies the same volume on its own.
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The complete question is:
equal numbers of moles of h2(g), ar(g), and n2(g) are placed in a glass vessel at room temperature. if the vessel has a pinhole-sized leak, which of the following will be true regarding the relative values of the partial pressures of the gases remaining in the vessel after some of the gas mixtures have effused?
a) Pressure H₂< Pressure N₂ < Pressure Ar
b) Pressure H₂ < Pressure Ar < Pressure N₂
c) Pressure Ar < Pressure N₂< Pressure H₂
d) Pressure H₂ = Pressure Ar = Pressure N₂
In the titration of a strong acid with a strong base, how would you calculate these quantities?
Part A initial pH O The initial pH of the solution is simply the pH of the strong acid. Because weak acids completely dissociate, the concentration of H. O is the concentration of the strong acid and pH logDOH O The initial pHof the solution is simply the pH of the strong acid. Because strong acids partially dissociate, the concentration of H3O+ is the concentration of the strong base and pH og H3O+]. O The initial pH of the solution is simply the pH the strong acid. Because strong acids completely dissociate, the concentration of OH is the concentration of the strong acid and pH ogDOH O The initial pHof the solution is simply the pH of the strong acid. Because strong acids completely dissociate, the concentration of H3O+ is the concentration of the strong acid and pH og H3O+].
In the titration of the strong acid and the strong base , The acid and the base will react and will form the neutral solution.
The quantities can be calculated as :
1) The initial pH of the solution = the pH of the strong acid. Because the strong acids completely dissociate, the concentration of H₃O⁺ is the concentration of strong acid and pH = -log[H₃O⁺].
2) The pH before the equivalence point = Before the equivalence point, H₃O⁺ is in the excess. Then convert to pH using -log[H₃O⁺].
At the equivalence point, neither the reactant is in excess and the pH = 7.00. The pH 7 is for the neutral solution.
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Although the combustion of methane is a thermodynamically favored process, a spark must be introduced in order to trigger the reaction. Which of the following statements provides the best explanation for why this is so? (A) The spark provides the activation energy required to get the reaction started. (B) The hot chemicals from the flint catalyze the reaction. © The heat from the spark increases the activation energy for the reaction.(D) The heat from the spark decreases AE, making the reaction less exothermic.
(A)The spark provides the activation energy required to get the reaction started.The statement that provides the best explanation for why a spark must be introduced in order to trigger the combustion of methane is (A)
Activation energy (Ea) is the energy required to overcome the energy barrier that separates the reactants from the transition state leading to the products. Some chemical reactions require a certain amount of energy to get started, called activation energy. In order to initiate the reaction, a spark is needed to supply the activation energy needed to overcome the energy barrier that separates the reactants from the transition state leading to the products. The heat from the spark increases or decreases the activation energy for the reaction. The heat from the spark does not catalyze the reaction. It is the spark which provides the activation energy, not the heat. In summary, the combustion of methane is thermodynamically favored process, but it needs a spark to provide the activation energy required to get the reaction started. This is why a spark must be introduced in order to trigger the combustion of methane.
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2K3N + 3CaCl2 → 6KCl + Ca3N2
1 mol K3N = 131.301 g K3N
1 mol CaCl2 = 110.984 g CaCl2
1 mol KCl = 74.551 g KCl
1 mol Ca3N2 = 148.248 g Ca3N2
How many grams of CaCl2 would it take to make 1.5 moles of KCl?
a
110.984 g
b
83.238 g
c
54.213 g
d
166.476 g
