The SiBr4 is non polar as the bond it shares it's covalent bond and silicon is more electronegative.
Silicon tetrabromide is a covalent compound with a valuable silicon atom. Silicon itself carries four valence electrons as a primary institution 4A (institution 14) element. It will percentage all of those valence electrons via four single covalent bonds to the four peripheral bromine atoms.
Based on VSEPR theory, a valuable atom with four covalently-related peripheral atoms and 0 non-bonding pairs, outcomes in a tetrahedral molecular geometry. Each Si-Br covalent bond is non polar due to the fact bromine is greater electronegative than silicon. However, the molecule itself isn't always polar, because of the geometry present.
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Why is electromagnetic radiation a transverse wave?
Since the direction of particle displacement in electromagnetic waves is also perpendicular to the direction of motion, generating the waveform of visible light and other forms of electromagnetic radiation, they are also transverse waves.
In a transverse wave, the displacement is perpendicular to the direction of motion (at an angle of 90 degrees Celsius). The direction of displacement (up and down) in the case of the ocean wave is perpendicular to the direction of wave motion (horizontally along the water), making it a transverse wave.
How far a particle has moved from its original starting position, or, in the case of an ocean wave, how high or low the water is, is measured by its displacement or amplitude.
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g if 2 moles of al is stoichiometrically equivalent to 3 moles of h2, how many moles of hydrogen form from 6 moles of aluminum?
9 moles of [tex]H_{2}[/tex] can be made from complete reaction of 6 moles of Al with hydrogen chloride.
In chemistry, stoichiometry is the measurement of the ratios in which different substances or elements interact. The laws of conservation of mass and energy as well as the law of combining weights or volumes serve as the foundation for the rules used in the determination of stoichiometric relationships.
In the field of chemistry known as stoichiometry, needed quantitative data is ascertained by exploiting relationships between the reactants and/or products of a chemical process. Stoichiometry literally translates as the measure of elements because the Greek words stoikhein and metron both mean element and measure, respectively.
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which is always higher for any given substance: the heat of fusion or the heat of vaporization? why?
The heat of vaporization is higher than the heat of fusion because the transformation from solid to liquid needs the breaking of a few bonds while changing liquid to gas requires the disruption of intermolecular forces and bonds.
What is the heat of fusion?The heat of fusion of a substance can be described as the change in its enthalpy by giving energy or heat, to a specific quantity of the substance to change from a solid to a liquid keeping pressure constant.
The heat of fusion can be measured by the amount of heat that requires to be introduced to change its crystalline fraction into the disordered state. The heat of fusion is uniquely dependent upon the degree of crystallinity and the theoretical heat of fusion which is 100% crystalline.
Latent heat of vaporization can be described as the heat consumed when matter disintegrates, changing state from liquid to gas state at a temperature.
The heat of vaporization can be described as characterized as the measure of heat expected to change 1 g of a liquid into a fume, without a change in the temperature of the liquid.
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in double replacement reactions, why will two metals not combine with each other when products are formed?
In double replacement reactions, the two metals will not combine with each other when products are formed because the atoms of metals contain less than half the full complement of electrons in their outermost shell.
What is Double replacement reaction?This is referred to as a type of reaction in which the positive and negative ions of two compounds exchange places to form two new products or substances.
The two metals will not combine with each other when products are formed because of their atoms having less than the required electrons which is needed to complement those in the outermost shell.
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nitrogen gas reacts with hydrogen gas to produce ammonia gas: n2(g) 3h2(g) --> 2nh3(g) what volume of h2 is required to react with 3.00 l of n2 and what volume of nh3 is produced at 200oc? group of answer choices
N2(g)+3H2(g)→2NH3(g) , mass of NH3 (Ammonia) produced = 96.3 g
3 x 2 g H2 gives 2 x 17 g NH3
3.98 g H2 gives 3.98 x 2 x 17 / 3 x 2 = 22.5 g NH3
mass of NH3 produced = 22.5 g
28 g N2 require 3 x 2 g H2
3.20g N2 require 3.2 x 3 x 2 / 28 = 0.65 g
mass of H2 needed = 0.65 g
3 x 2 g H2 gives 2 x 17 g NH3
17 g H2 gives 17 x 2 x 17 / 3 x 2 = 96.3
mass of NH3 produced = 96.3 g
Ammonia is created when one nitrogen and three hydrogen atoms come together. It has a design that tetrahedral. Ammonia is used as a fertilizer, to clean with, and to make nitric acid solution. Commonly found as a gas, NH3 can be harmful if exposed for an extended period of time. NH3 has When being stored, it must be kept under pressure or at extremely low temperatures. In the United States, ammonia is a chemical that is regulated as a non-flammable gas. It yet meets the requirements for an inhalation hazard and necessitates a permit for hazardous safety. Ammonia is typically a gas with an overpowering odor.
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place the following in order of decreasing bond length. h-f, h-i, h-br
The decreasing bond length is H-I > H-Br > H-F.
What is bond length?
The bond length is the separation between the centres of two atoms that are covalently bound. The number of bonded electrons influences the length of the bond (the bond order). Higher bond orders are related to shorter bond lengths and stronger forces between the two atoms.
What is bond order?
The shared covalent bonds between two atoms. When two atoms share one pair of electrons, one bond (bond order = 1) is created. A double bond is made up of two pairs of electrons (bond order = 2), whereas a triple bond is made up of three pairs of electrons (bond order = 3).
H-I > H-Br > H-F
With increase in atomic size from F to I ,bond length of H----X
bond increases
Therefore, the decreasing bond length is H-I > H-Br > H-F.
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color in a unit cell of this two-dimensional lattice:
The color in a unit cell of a two-dimensional lattice is determined by the arrangement of atoms within the lattice structure. A unit cell is the smallest repeating unit within the lattice, and it contains all of the atoms within the lattice.
The atoms are arranged in a regular pattern, which can be described as a crystal lattice.The color in a unit cell is determined by the type of bonds that exist between the atoms in the lattice. Different types of bonds will produce different colors. For example, ionic bonds are strong and result in a bright, vivid color, while covalent bonds are weaker and produce a more muted color. Metals, on the other hand, have metallic bonds, which produce a metallic sheen.
The color of a unit cell can also be affected by the properties of the atoms themselves. For example, if the atoms have a large difference in electronegativity, the unit cell may appear to have a strong color contrast. Additionally, the color can vary depending on the angle at which it is viewed.In summary, the color in a unit cell of a two-dimensional lattice is determined by the type of bonds that exist between the atoms, as well as the properties of the atoms themselves. These factors will determine the overall appearance of the unit cell.
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what kinds of forces hold ionic solids together? check all that apply. what kinds of forces hold ionic solids together?check all that apply. dipole-dipole forces metallic bonds hydrogen bonds electrostatic attraction dispersion forces covalent bonds
Electrostatic attraction hold ionic solids together.
What is Electrostatic attraction?
To understand the word ‘Electrostatic appeal’, we need to first revise the fundamentals of the Electrostatic area. It says that similar costs (like positive & tremendous) repel each other and distinct fees (like fine and negative) appeal to each other.
Electrostatic appeal is a force of enchantment which is exerted through two in contrast to or numerous (contrary) expenses on each different whilst they may be stored at some finite distance aside. That is additionally referred to as contactless appeal between contrary prices or we are able to say this Electrostatic pressure attracts distinct expenses with out touching them.
The concept of electrostatic pressure turns into clearer if we remember a sensible instance. If we convey North Pole of a magnet near to North Pole of another piece of magnet then those portions of magnet will repel every different and if we carry North Pole of one magnet close to the south pole of some other piece of magnet then they may entice to every other.
As we know those atom donate the electron gets positively charged and those atoms gains the electron gets negatively charged. The charge on the atoms are the responsible for the force in the ionic bond.
We know that force between two charge particle is known as electrostatics force. If charge particle is having same sign charge then it will be repulsive force and If charge particle is having opposite sign charge then it will be attraction force.
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Which of the following is the correct arrangement of the following atoms in order of DECREASING first ionization energy?
O>Te>Se>Po
Po>Te>Se>O
O>Se>Te>Po
Po>Se>Te>O
The ionization energy is decreasing down a group. Hence the first ionization energy is decreasing from oxygen to polonium and the order is O>Se>Te>Po.
What is ionization energy?Ionization energy is the minimum energy required to remove the loosely bound valence electron from the atom. As the atomic size decreases, the attractive pull from the nucleus increases and ionization energy increases.
Thus, along a period the ionization energy increases and down a group it decreases since down a group atomic size is increases. The oxygen family is starting from oxygen to sulfur, selenium, tellurium and polonium.
Thus, the highest ionization energy is for oxygen and lowest for plonium. Thus, the order is O>Se>Te>Po.
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i cant figure out the last one because the first one is toxic the second one is radiation danger and the third one is biohazard but i don't know the last one
Answer: Chemical weapon
Explanation: This symbol usually exists where a chemical agent is being produced. It's to tell you to be really careful around these kinds of places.
determine the percent yield if 21.8g of k2co3 is produced from reacting 27.9g ko2 with 29.0l of co2
According to the given statement, the percent yield K₂CO₃ is 80.47 %is produced from reacting 27.9g ko2 with 29.0l of co2 .
What is K2CO3 used for?Potassium carbonate is widely used for the production of glass and soap. It is also used as a drying agent which is mild in nature. Many wine production processes involve the use of this compound as a buffering agent. Potassium carbonate is also used as a fire suppressant.
Briefing:Mass of = 27.9 g
Volume of = 29.0 L (At STP)
Molar mass of = 71.10 g/mole
Molar mass of = 44 g/mole
Molar mass of = 138.21 g/mole
Now we have to calculate the percent yield of K₂CO₃
% yield of K₂CO₃ =Actual yield of K₂CO₃ /Theoretical yield of K₂CO₃*100
= 21.8g/27.9g*100
=80.47%
Therefore, the percent yield of K₂CO₃ is, 80.47 %
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draw the electron configuration for a neutral atom of cobalt
The electron configuration for a neutral atom of cobalt is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷.
Cobalt [tex]Co \limits^{58.93}_{27}[/tex] have
Mass number = 58.93Atomic number = 27 Proton = electron = 27The electron configuration is the distribution of electrons from the lowest energy level according to the Aufbau principle. From the lowest energy level 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, ...
The numbers in the exponents indicate the maximum number of electrons that can holds.
₂₇ Co : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷
Before 3d, there were already 20 electrons, so in 3d there are only 7 left. 5 atoms are shown with up arrows and 2 down arrows because we must fill, up arrows first.
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Draw the Lewis structure for bromoethane C2H5Br . Be certain you include any lone pairs.
The Lewis structure is attached below:
What is the Lewis structure?Lewis structures also called electron dot structures, or Lewis electron dot structures, are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.
The Lewis rule states that Hydrogen atoms form only single bonds and they are always at the ends of a sequence of atoms. Hydrogen often is bonded to carbon, nitrogen or oxygen. Oxygen atoms usually do not bond to each other, except for O2, O3, superoxides and peroxides.
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Yellow light has wavelength of 580 nm What is the energy of a mole of photons of this kJlmol? lighc in Write vour answer with digits only for example 555 or 88.7 Do not write in the units (which are kJmol) The value ofh = 6.626X10 34 J-s.
The wavelength of one mole of photons of yellow light is 2 x 10^6 J.
The wavelength of the yellow light is given to be 580nm.
We know, the energy of one photon of the light with wavelength Y will be given by,
E = hc/Y
Where,
h is Planck's constant,
c is the speed of light.
Now, for one mole of photons.
We should multiply the energy of one photon to avogadro number.
So, the energy of one mole of photon is,
E = Nhc/Y
Where N is avogadro number.
Putting values,
E = 6.02 x 10^23 x 6.62 x 10^-34 x 3 x 10^8/580x10^-9
E = 0.20 x 10^7
E = 2 x 10^6 J.
So, the energy of one mole of photon is 2 x 10^6 J.
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Draw the condensed structure for each of the following: a. (Z)-1,3,5-tribromo-2-pentene, b. (Z)-3-methyl-2-heptene, c. (E)-1,2-dibromo-3-isopropyl-2-hexene, d. vinyl bromide, e. 1,2-dimethylcyclopentene, f. diallylamine
The condensed structure formula are where it shows all atom but will omits the vertical bonds and all the horizontal single bond.
The condensed structure formula is given as follows :
a) 1,3,5-tribromo-2-pentene = BrH₂CCH₂ - C = CH - CH₂Br
|
Br
b) 3-methyl-2-heptene = CH₃CH₂CH₂CH₂ - C = CH - CH₂
|
CH₃
c) 1,2-dibromo-3-isopropyl-2-hexene = CH₃CH₂CH₂ - C = C - CH₂Br
| |
CH₃CH₂ Br
|
CH₃
c) vinyl bromide = CH₂ = CHBr
e) diallylamine = CH₂ = CHCH₂ - NH - CH₂CH = CH₂
Thus, the condensed structure for the given compounds are given above.
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Use this diagram to complete the table below_ Which Is the ground state? (pick one} How many excited states are there? How many lines are in the absorption line spectrum? Which transition causes the absorption line at the shortest wavelength? Which transition causes the absorption line at the longest wavelength?
In total there are 2 excited states above the ground state as many excited states are there. Red light transition causes the absorption line at the shortest wavelength.
Any quantum state of a system that is more energetic than its ground state is considered to be the system's excited state in quantum mechanics. Excitation is defined as an increase in energy level over a preset starting point, often the ground state, but occasionally an excited state. The level of excitation is indicated by a particle collection's temperature. The lifetime of a system in an excited state is often brief: immediately after the system is promoted to the excited state, spontaneous or induced emission of a quantum of energy (such as a photon or a phonon) typically happens, returning the system to a state with lower energy. The term "decay" is usually used to describe this drop to a lower energy level, which is the reverse of excitement. Long-lasting stimulated states are frequently referred to as metastable states. Two examples of this are long-lived nuclear isomers and singlet oxygen.
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a chemist measured the amount of hydrogen bromide produced during an experiment. she finds that of hydrogen bromide is produced. calculate the number of moles of hydrogen bromide produced.
Molar mass of HBr is 80.91194 g/mol.
Molar mass of Br = 79.904
molar mass of H = 1.00794
Molar mass of HBr = 79.904 + 1.00794 = 80.91194
The mass of a sample of a chemical compound divided by the quantity, or the number of moles in the sample, expressed in moles, is known as the compound's molar mass. The molar mass is a bulk property of a material rather than a molecular one. The compound is present in many different forms, each with a different mass as a result of the isotopes. The molar mass is the average of these masses. The molar mass is most frequently calculated using the standard atomic weights and is a function of the relative abundance of the constituent atoms' isotopes on Earth. It is thus a terrestrial average. The conversion between a substance's mass and amount can be done using the molar mass.
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Part A What are the four quantum numbers for each of the two electrons in a 4s orbital? For first electron: n=4, l=3, ml=3, ms=+1/2 n=3, l=1, ml=0, ms=-1/2 n=1, l=0, ml=0, ms=-1/2 n=4, l=0, ml=0, ms=+1/2
For an electron in 4s orbital, the principal quantum number is 4, Azimuthal quantum number is 0, magnetic quantum number is 0 and spin quantum number is -1/2 or + 1/2.
There are four quantum numbers are used to describe completely the movement and trajectories of each electron within an atom. In atoms, there are a total of four quantum numbers. Principal quantum number n, designates the principal electron shell. The magnetic quantum number ml determines the number of orbitals and their orientation within a subshell. Electron spin quantum number designates the direction of the electron spin and may have a spin of +1/2. The orbital angular momentum quantum number determines the shape of an orbital, and therefore the angular distribution. The number of angular nodes is equal to the value of the angular momentum quantum number l.
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Draw the Lewis structure of IF4+ and then answer the following questions about it.
What is its steric number? [ Select ] ["0", "1", "2", "3", "4", "5", "6"]
What is the electron group geometry? [ Select ] ["linear", "trigonal planar", "tetrahedral", "trigonal bipyramidal", "octahedral"]
What is the molecular geometry? [ Select ] ["linear", "trigonal planar", "bent", "tetrahedral", "trigonal pyramidal", "trigonal bipyramidal", "see saw", "T-shaped", "octahedral", "square pyramidal", "square planar"]
What is the hybridization of I? [ Select ] ["sp", "sp2 (the 2 should be superscript)", "sp3 (the 3 should be superscript)", "sp3d (the 3 should be superscript)", "sp3d2 (the 3 & 2 should be superscript)"]
Is the molecule polar? [ Select ] ["yes", "no"]
How many sigma bonds are in the molecule? [ Select ] ["0", "1", "2", "3", "4", "5", "6"]
How many pi bonds are in the molecule? [ Select ] ["0", "1", "2", "3", "4", "5", "6"]
A total of 36 valence electrons make up the IF4: seven from the iodine atom, seven from each of the four fluorine atoms, and one from the negative charge. Iodine will serve as the main atom. Four single bonds will be created with fluorine atoms, totaling 8 of the 36 available valence electrons.
Does the planar square shape of if 4 exist?
Hybridization is therefore [sp3d2], and although the molecule has an octahedral structure, the atom's geometry is square planar because iodine carries two lone pairs of electrons, one above and one below the plane. As a result, the molecule has a square planar shape.
What is water's steric number?
In the case of water, the central oxygen atom possesses two non-bonding pairs and is connected to two hydrogen atoms. The steric number for water is 4, which is calculated as the sum of the number of atoms linked to the central atom plus the number of non-bonding pairs.
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given that you wished to use exactly 0.325 mole of nacl to prepare a 2.50 m nacl solution, how many milliliters of solution must you prepare? group of answer choices
You must make an 813 ml solution.
M is equal to the moles of solute/liters of solution. L = moles x Molarity will give you liters.
2.50 M x 0.325 mole = 0.813 L, therefore. For milliliters, multiply by 1000. 813 ml has 3 significant digits, so.
Any mixture of one or more solutes that have been dissolved in a solvent is referred to as a solution. a solvent is a substance that helps a solute dissolve so that a homogenous mixture results. solute: the substance that dissolves in a solvent to create a homogenous mixturesolvent: the substance in which a solute dissolves to create a homogeneous mixture
When a substance dissolves in a solvent, a homogenous mixture is created, which is known as a solute.
The solvent, which is present in the highest concentration, should be noted. Solutions come in a wide variety of forms. A solute could be a solid, liquid, or gas, for instance. Besides being solids or liquids, solvents can also be gases.
The microscopic actions of numerous distinct solutions types are depicted in the following images. Be aware that the solution in each scenario
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a mixture of methane and hydrogen gases at a total pressure of 889 mm hg contains methane at a partial pressure of 332 mm hg. if the gas mixture contains 2.48 grams of methane, how many grams of hydrogen are present?
Methane is present in a mixture of hydrogen and other gases with a partial pressure of 332 mm hg, or 889 mm hg overall. 3.287 grams of hydrogen are present in a gas mixture containing 2.48 grams of methane.
Given,
total pressure (P[tex]_{t}[/tex])=889 mm hg
partial pressure (P[tex]_{me}[/tex])=332 mm hg
mass of methane,(m[tex]_{me}[/tex])=2.48g
P[tex]_{t}[/tex]=P[tex]_{me}[/tex]+P[tex]_{H}[/tex]
P[tex]_{H}[/tex]=P[tex]_{t}[/tex]-P[tex]_{me}[/tex]=889-332=507mm hg
partial pressure P[tex]_{H}[/tex]=507 mmHg
now, X[tex]_{H}[/tex](mole fraction of hydrogen)=P[tex]_{H}[/tex]/P[tex]_{t}[/tex]=507/889=0.5703
now, the mass of methane/total mass=X[tex]_{\triangleq}[/tex]=1- X[tex]_{H}[/tex]
2.48/(2.48+m[tex]_{H}[/tex])=1-0.5703
m[tex]_{H}[/tex]=3.287g
In order to measure an object's surface tension, a force must be applied perpendicularly to the object's surface over a given area. Alternatively spelled gauge pressure, gauge pressure is the pressure in relation to atmospheric pressure.
Pressure is expressed using a number of different units. The SI unit of pressure, the pascal (Pa), for instance, is equal to one newton per square meter (N/m2); similarly, the traditional unit of pressure in the imperial and U.S. customary systems is the pound-force per square inch (psi). Some of these measurements are the result of dividing a unit of force by a unit of area. The atmosphere, or atm, is equal to this pressure, which can alternatively be stated as the pressure in terms of its standard value.
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about how many grams of carbohydrate are contained in one ounce of foods in the grain group?
There are 15 grams of carbohydrate that is present in one ounce of foods in the grain group.
The simple unit of all carbohydrate is a monosaccharide, that's a single 6-carbon ring structure. Foods high in carbohydrates are an important part of a healthy diet. The RDA for carbohydrates for adults age 19 and older is 130 grams per day. The AMDR is 45% to 65% of total energy intake. Fiber (non starch polysaccharides), composed of many glucose molecules, which the human frame can't spoil down. Carb counting at its maximum simple stage entails counting the quantity of grams of carbohydrate in a meal and matching that in your dose of insulin.
Therefore, 15 grams of carbohydrate that is present in one ounce of foods in the grain group.
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What the frequency of an electromagnetic radiation with wavelength of 4. 257 x 10^-9 m what type of EMR i thi
the wavelength of an electromagnetic wave is 4. 257 x 10-9 m, and its frequency is 0.7047 * 10¹⁷ s⁻¹
λ=4.257nm=4.257x 10^-9 m [∵1nm=10⁻⁹m]
c=3×10⁸ m/sec
c=vλ
[tex]v=\frac{c}{λ}[/tex]
=3*10⁸/4.257x 10⁻⁹
=0.7047 * 10¹⁷ s⁻¹
Physically speaking, electromagnetic radiation (EMR) is made up of electromagnetic (EM) field waves that travel through space carrying electromagnetic radiant energy. It consists of microwaves, X-rays, gamma rays, infrared, visible light, and other electromagnetic waves. A spectrum of electromagnetic wave includes each of these waves.
Traditional electromagnetic radiation is made up of electromagnetic waves, which are coordinated oscillations of the electric and magnetic fields. A periodic shift in the electric or magnetic field is what causes electromagnetic radiation or waves to be produced. Different electromagnetic spectrum wavelengths are created depending on the power generated and how this periodic shift happens. Electromagnetic waves move at the speed of light in a vacuum, typically abbreviated as c. The two fields oscillate in a manner that is perpendicular to one another in homogeneous, isotropic media.
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cehgg suppose 14.0 g of ice at -10.0c is placed into 300.0 g of water in a 200.0-g copper calorimeter. the final temperature of the water and copper calorimeter is 18.0c. 1) what was the initial common temperature of the water and copper? (express your answer to three significant figures.)
The initial temperature of the water and copper is 22.51°C.
Mass of ice m = 14 g
We know, 1g = 0.001 kg
So, m= (14 x 0.001)kg = 0.014kg
Mass of water ml = 300g = (300 x 0.001)kg = 0.3kg
Mass of copper calorimeter m₂ = 200g = (200 × 0.001) kg = 0.21 kg
Specific heat of water s₁ = 4186 [tex]\frac{J}{kg . C}[/tex]
Specific heat of ice s₂ = 2100 [tex]\frac{J}{kg.C}[/tex]
Specific heat of copper s₃ = 387 [tex]\frac{J}{kg.C}[/tex]
Latent heat of fusion of water L = 3.33 x 10⁵ [tex]\frac{J}{kg}[/tex]
Initial temperature of ice T₁ = - 10°C
Initial temperature of water copper is T₂
Final temperature of the system is T = 18 °C
From equilibrium in heat
Heat gain by ice to become 0°C of ice +0°C of ice become 0 °C of water + 0°C of water become 18°C of water = heat loss by copper and water
ms₂ (0°-(-10°)) + mL + ms₁ (T -0°) = m₁s₁ (T₂-18°) + m₂s₃ (T2 - 18°)
∴ 0.014 × 2100 × 10 + 0.014 × 3.33 × 10⁵+ 0.014 × 4186 × 18 = 0.3 × 4186 × (T₂- 18 ) + 0.2 × 387 × ( T₂ -18 )
∴ 6010.87 = 1333.2(T₂ - 18)
∴ T₂ - 18 = 6010.87 / 1333.2 = 4.51
∴ T₂ = ( 18 + 4.51 )
∴ T₂ = 22.51° C
So, the initial temperature of the water and copper is 22.51°C.
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In 1886 a Swiss schoolmaster, Johann Jacob Balmer, published a paper in which he described a
numerical relationship for the prominent lines in the atomic spectrum of hydrogen which appear in
the visible region and near ultraviolet region of the spectrum (approximately 250 nm to 700 nm).
For the transitions that occur in this region, list the wavelengths and energies involved and determine
the characteristic that these lines have in common.
Any line in this range will belong to the Balmer series since the wavelength of the two series that are closest to it are not in the range of 250 nm to 700 nm.
How can the number of lines in a hydrogen spectrum be determined?Possible numbers for spectral lines are (n2-n1)(n2-n1+1)/2.The wavelength of this light can be calculated to be 486.3 nm, which is consistent with the experimental value of 486.1 nm for the blue line of the hydrogen atom's visible spectrum.Even though a hydrogen atom only has one electron, it has several shells. Therefore, a photon is released when this single electron moves from one shell to another, and the energy difference between the shells is revealed.Any line in this range will belong to the Balmer series since the wavelength of the two series that are closest to it are not in the range of 250 nm to 700 nm.To learn more about hydrogen atom refer to:
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g which statement best describes a concentration cell when the solutions in each compartment are 0.50 m?
What statement about a concentration cell best represents it when the solutions for each compartment is 0.50 m The cell potential is zero.
What does cell potential mean?The potential difference between the electrodes of an electrochemical cell, which results from the flow of electrons through an unbalanced cell's external circuit, is known as the cell potential.
What other name does cell potential go by?The normal cell potential, also called the standard electrode potential, belongs to a class of potentials. The potential difference in between cathode and anode is what determines a cell's inherent potential. At 298 K, 1 atm, and 1 M solutions, all standard possibilities are measured.
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Which star type has a surface temperature of 4000 K and a luminosity 1000 times greater than the Sun? dwarf
The star type that has a surface temperature of 4000 K and a luminosity 1000 times greater than the Sun is a main sequence star, also known as a dwarf star.
Dwarf stars are the most common type of star in the universe, and they are characterized by a surface temperature of between 3000 K and 7000 K. These stars are relatively small and have a mass similar to that of the Sun, but they are much more luminous, with a luminosity that can be 1000 times greater than the Sun.
Dwarf stars are classified into different spectral types based on their surface temperature, with stars like the Sun being classified as G-type dwarf stars. A star with a surface temperature of 4000 K would be classified as a K-type dwarf star.
Dwarf stars are important because they are the primary source of energy for planetary systems, and they are also the primary source of heavy elements that are necessary for the formation of planets and life.
Question 15 What is the correct chemical formula for dinitrogen trisulfide?
a. N2S3
b. Ni2S3
c. Ni3S2
d. N3S2
Option ( a) is correct. The chemical formula for dinitrogen trisulfide is N2S3 in which N stands for nitrogen and S stands for Sulphur.
The chemical compound dinitrogen trisulfide has the formula N2O3. It is one of the simple nitrogen oxides. It forms upon mixing equal parts of nitric oxide and nitrogen dioxide . Based on its name, it will contain 2 Nitrogen (N) atoms because it has a prefix of di and 3 Sulfur (S) atoms because it has a prefix of tri. The common name for the compound N2S3 is dinitrogen trisulfide. According to Pauling Electronegativity values, nitrogen has a greater value that of N equals to 3.0 than Sulphur that equals to 2.5. For the prefix of di we put two and for the prefix tri we put three. and here N stands for Nitrogen and s stands for Sulphur.
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how many moles of water are formed when 28.0 ml of 0.250 m hno3 and 53.0 ml of 0.320 m koh are mixed?
The amount of water that will be created is 0.007 moles, while the amount of OH ions present is 0.123 M.
Given are V = 28 ml and molarity = 0.250 M for nitric acid.
Nitric acid has a molecular weight of 0.250 (28/1000) = 0.007 mol.
V = 53 ml and molarity = 0.320 M are provided for KOH.
KOH has a molecular weight of 0.320 (53/1000) = 0.01696 mol.
Nitric acid is the reaction's limiting reagent as a result.
One mol of nitric acid results in one mol of water, according to the chemical equation.
As a result, 0.007 mol of nitric acid will result in 0.007 mol of water.
Nitric acid is completely destroyed, but the remaining KOH will produce an excess of OH ions, which equals 0.01696 - 0.007 = 0.00996 moles.
The solution has a total volume of 28 + 53 = 81 ml, or 0.081 ml.
The amount of excess OH ions is equal to 0.00996/0.081 = 0.123 mol/L.
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a 9.394mg sample of compound yielded 31.154 mg of carbon dioxide and 7.977 mg of water in combustion. calculate percent compositiobn of compound
%C = 90.5% and%H = 9.5%, You can determine by mass the amount of every element is contained in a compound using its percent composition.
Which is larger, mass or moles?Masses percent composition too is referred to as mass percent. The symbol for it is w/w%. A solution's mass percent is calculated by dividing the mass of each element present in one moles of the compound by the compound's molar mass and multiplying the result by 100%.
What do mass percent and composition percent mean?Despite their interchangeability, the phrases mass percent or percent composition are distinct. While the average concentration refers to a percentage of a certain chemical element inside a mixture, it weight percentage refers to the proportion of the a component in a combination.
Briefing:Mass of compound = 9.394 mg
Mass of CO2 yielded = 31.154 mg
Mass of H2O yielded = 7.977 mg
Molar mass of CO2 = 44.01 g/mol
Molar mass of H2O = 18.02 g/mol
mass of C = 7.08 × 10^-4 mol × 12.01 g/mol
mass of C = 0.0085 grams
mass of H = 8.86 × 10^-4 mol × 1.01 g/mol
mass of H = 0.000894 grams
Total mass of the compound = 0.0085 grams + 0.000894 grams = 0.009394 grams 9.394 mg
%C = (8.50 mg / 9.394 mg) x 100 = 90.5%
%H = (0.894 mg / 9.394 mg) x 100 = 9.5%
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