Due to same d-same shell, that's why first ionization energy of the transition elements .
What is ionization energy?Ionization energy, also called ionization potential, in chemistry and physics, the amount of energy required to remove an electron from an isolated atom or molecule.
What is transition elements?Transition elements (also known as transition metals) are elements that have partially filled d orbitals. IUPAC defines transition elements as an element having a d subshell that is partially filled with electrons, or an element that has the ability to form stable cations with an incompletely filled d orbital.
Why first ionization energy of the transition elements is constant?In transition elements, the first ionization energy of the elements remain constant because of poor shielding in d-subshell. The electrons suffers repulsion due to which their ionic radii does not decrease on moving from left to right. That's why first ionization energy of the transition elements from Sc to Zn fairly constant until Zn.
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What is the best use of probability in genetics?
A. To calculate the possible blood types of offspring
B. To exactly predict the the traits each offspring will have
C. To better parents' chances of having female or male offspring
D. To determine how many offspring parents will have
Answer: B
Explanation: Genetics has to do with genes, which is appearance, which is hereditary from the parent :)
a gas mixture used for anesthesia contains 2.83 mol oxygen (o2), and 8.41 mol of nitrous oxide (n2o). the total pressure of the mixture is 192 kpa. what is the partial pressure of n2o?
partial pressure of n2o in the gas mixture was found to be 143.6 kPa
what is partial pressure?
Each gas that makes up a mixture of gases has a partial pressure, which represents the pressure that would exist if that gas alone had filled the complete volume of the initial mixture at the same temperature. According to Dalton's Law, the partial pressures of the individual gases make up the overall pressure of a perfect gas combination.
A gas's partial pressure is a gauge of its molecules' thermodynamic activity. However, unlike liquids or gas mixtures, gases behave differently depending on their partial pressures when dissolving, diffusing, and reacting. This characteristic of gases often holds true for gas chemical reactions in biology.
As per the data give
Moles (o2) = 2.83 mol
Moles (n2o) = 8.41 mol
Total pressure = 192 kPa
so the total number of moles should be calculated
Total No.of moles = no of moles in o2 + no of moles in n2o = 2.83 + 8.41 = 11.24 mol
mole fraction for n2o
Mole fraction = moles of compound/ Total moles
Mole fraction for n2o = 8.41 / 11.24 = 0.748
so now calculate the partial pressure of n2o
pn2o = 0.748 192 kPa
pn2o = 143.6 kPa
therefore the partial pressure of the n2o was 143.6 Kpa
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2. 2.00 gram of a compound requires the following quantities of solvent to dissolve: 90.0 ml of water, 7.50 ml of chloroform, 32.0 ml of diethyl ether, or 85.0 ml of benzene. calculate the partition coefficient of the compound between chloroform and water, diethyl ether and water, and benzene and water. which solvent would you choose to extract the compound from an aqueous solution?
Partition coefficient Chloroform = 11.98, Diethyl Ether = 2.81 and Benzene = 1.05
Chloroform would be the ideal solvent to use when extracting the chemical from an aqueous solution because it has the highest solubility.
A solution is a homogenous mixture of one or even more solutes in a solvent. Adding sugar cubes to a cup of tea or coffee is an example of a solution. A property that facilitates the dissolution of sugar molecules is solubility. Solubility is the property of a substance (solute) to dissolve in a particular solvent. A solute is any solid, liquid, or gaseous substance that dissolves in a solvent.
The compound needs 2 grams of solvent to dissolve it.
Finding solubility
For water, 2g/90ml= 2.22
For chloroform, 2g/7.50= 26.6
For diethyl ether, 2g/32= 6.25
For benzene, 2g/85= 2.35
Partition Coefficients -
For chloroform = 11.98
For Diethyl Ether = 2.81
For Benzene = 1.05
As a result of its high solubility, chloroform would be used to extract a compound from an aqueous solution.
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How many formula units of NaCl are there in a 10. 95 mole sample of sodium chloride
Answer: 6.59 x 10^24 formula units
Explanation: Formula units are another word for atoms, meaning we use Avogadro's number (6.022x10^23 atoms per mole), we multiply 10.95 by Avogadro's number to get the answer
what is the heat of a reaction, in joules, with a total reaction mixture volume of 70.6 ml if the reaction causes a temperature change of 6.1 oc in a calorimeter? assume that the reaction mixture has a density of 1.00 g/ml and a specific heat of 4.184 j/g-oc. the calorimeter has a heat capacity of 10.0 j/oc.
With density 1.00 g/ml and a specific heat of 4.184 j/g we can see that the heat of the chemical reaction in joules is H = 1,596 J
We are given
Total volume of the mixture = 70.6 ml
Change in temperature = 6.1 °C
Density of reaction mixture = 1.00 g/ml
Specific heat of water = 4.184 J/g = 4200 J/Kg
Now Density = mass/volume
Mass of water = Density × volume
Mass of water = 1 g/mL × 62.3 mL
Now in order to find heat in joules, let's use the formula.
H = mcθ
m = mass of water
c = heat capacity of water
θ = temperature rise
Now substituting the values we get
H = 0.0623 Kg × 4200 J/Kg × 6.1 °C
H = 1,596 J = 1.5 KJ
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One volume of chlorine gas measured at STP would be liberated by the current of 2.5 ampere flowing for a period of 1.8 hours through an aqueous solution of silver chloride
The volume of chlorine gas produced at STP by the current of 2.5 amperes flowing for a period of 1.8 hours through an aqueous solution of silver chloride is 1.504 L.
What are the moles of chorine gas that are liberated at STP by passing a given current through an electrolyte containing chloride ions?The moles of chorine gas that are liberated at STP by passing a given current through an electrolyte containing chloride ions is determined from the equation of the oxidation reaction that occurs when chlorine gas is liberated from chloride ions.
The equation of the oxidation reaction is given below:
2 Cl⁻ ---> Cl₂ (g) + 2 e
From the equation of reaction, two moles of electrons liberated 1 mole of chlorine gas.
The volume of 1 mole of chlorine gas = 22.4 L
Quantity of current in 2 moles of electrons = 2 * 96500 C
Quantity of current in 2 moles of electrons = 193000 C
Quantity of current in 2.5 amperes flowing for a period of 1.8 hours = 2.5 * 1.8 * 3600
Quantity of current in 2.5 amperes flowing for a period of 1.8 hours = 12960 C
The volume of chlorine gas produced = 12960 * 22.4/1930000
The volume of chlorine gas produced = 1.504 L
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Complete question:
What volume of chlorine gas measured at STP would be liberated by the current of 2.5 amperes flowing for a period of 1.8 hours through an aqueous solution of silver chloride?
thin-layer chromatography was performed and four spots were visualized on the glass slide. the substance with which rf value was least soluble in the stationary phase?
The spot with the lowest Rf value would be the most polar one and, thus, the one that is least soluble in the stationary phase.
Does more polarity indicate a higher or lower Rf value?
Calculating the Rf value is possible if you can see the spots. The identity and properties of the various compounds can be established using the Rf values. Since more polar compounds have a stronger affinity for the polar solid phase, they will have smaller Rf values.Rf values are typically higher for low polarity chemicals compared to higher polarity ones. Generally speaking, as polarity of a compound increases, so does its adsorptivity (i.e. the more polar the compound then the stronger it binds to the adsorbent).To learn more about Rf values, follow the link https://brainly.com/question/14393432
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(c) Lithium oxide is an ionic compound.
Draw a dot and cross diagram to show how lithium and
oxygen combine to form lithium oxide.
Only show the electrons in the outer shell of each
atom.
Give the charges on the ions formed.
Answer:
Let us know formula and denotion for Lithium oxide is Li2O.
Explanation:
While on the basis of Electronic configuration:
Lewis structure(for Lithium atom)-Li•
For Oxygen atom- it is 6 dots in the Word O(for Oxygen) but is needed to paired in a pair(of two dots if possible) by the use of either all sides where two dots are presented two sides While one dot is represented on other two sides.
When we come across we might have a simple question how and why the Lithium oxide is Li2O
So,as we know Li(have one electron in its outermost shell),written as Li^+/+1 While Oxygen requires 2 more electrons to stabilize its valency,so it written as O^-2/2-
On combining,Li^+ & O^-2
Exchange and crossing up of valency is done forming Li2O.
Do check the image uploaded for better clarity and understanding.
describe the bohr model for the atom and explain how it accounted for the emission spectra of atoms.
The Bohr model for the atom explains how electrons chenges different energy levels and accounted for the emission spectra of atoms.
The Bohr model postulates that electrons orbit the nucleus at constant electricity ranges. Orbits in addition to the nucleus exist at better electricity degrees. While electrons go back to a decreased strength level, they emit energy in the shape of light.
Bohr's model shows that the atomic spectra of atoms are produced via electrons gaining energy from a few supplies, leaping as much as a better electricity degree, then without delay losing returning to a lower strength stage and emitting the strength difference among the 2 power ranges.
Bohr explained the steadiness of atoms by using presenting that electrons revolve across the nucleus inside the exact circular paths having fixed strength and while transferring in the same orbit they do now not lose or benefit from strength.
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in the tlc experiment silica gel is used as a solid phase to differentiates between what kind of compounds?
Silica gel and alumina are the most often utilized adsorbents. A wide range of chemicals, including hydrocarbons, alcohols, ketones, esters, acids, azo compounds, and amines, are separated using silica gel.
Because of its outstanding separation capabilities, the Silica Gel G for Thin Layer Chromatography as binder is most commonly employed as an adsorbent in thin-layer chromatography.
What is Silica Gel?Silica gel is a porous and amorphous type of silicon dioxide composed of an uneven tridimensional structure of alternating silicon and oxygen atoms with nanometer-scale holes and pores. The spaces might be filled with water or other liquids, or they could be filled with gas or a vacuum.
Silica gel is a desiccant, which means it is a drying agent. Its purpose is to absorb moisture and condensation from its surroundings. It is a very efficient and cost-effective method for businesses to keep their items fresh and dry for consumers during storage and shipping procedures.
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what should the mole percent of oxygen be in the diving gas for the partial pressure of oxygen in the mixture to be 0.21 atm , the same as in air at 1 atm ?
the mole percent of oxygen be in the diving gas for the partial pressure of oxygen in the mixture to be 0.21 atm , the same as in air at 1 atm is 2.52%
Atm 8.32 is the total pressure.
0.21 atm is the partial pressure of oxygen gas.
The relationship between partial pressure, total pressure, and mole fraction is depicted here.
partial oxygen pressure Total pressure x Mole percent of oxygen -
Calculate the gas's mole fraction of oxygen.
0.21 atm 8.32 x Mole fraction
Mole fraction = 0.21/8.32 = 0.0252
As illustrated below, determine the mole percent of the gas. Mole percent is equal to the mole fraction divided by 100, which is 0.0252 times 100 and 2.52% respectively.
As a result, oxygen's mole percent is 2.52%.
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For mn3 , write an equation that shows how the cation acts as an acid.
Equation showing the Mn³⁺ cation acting as an acid:
Mn³⁺+ H₂O → MnOH²⁺ + H⁺
A cation is a positively charged ion in a metal element whose formation is carried out by releasing one or more electrons from its outermost electrons to achieve stability.
The intermediate reaction is an acid-base reaction. Acid-base reactions generally produce salt and water. However, in this reaction what is formed is an anion and a conjugate acid-base cation because it uses the Bronsted-Lowry acid-base principle. Mn³⁺ acts as an acid so that it donates a proton MnOH²⁺ to H⁺ so that the species formed are MnOH²⁺ and H⁺.
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(1) what is the complete ground state electron configuration for the nitrogen atom? (2) what is the complete ground state electron configuration for the vanadium atom?
The ground state electronic configuration of Nitrogen atom is 1s²2s²2p³
The ground state electronic configuration of vanadium atom is 1s²2s²2p⁶3s²3p⁶4s²3d³
What is electronic configuration?Electron configuration is the distribution of electrons within an atom or molecule (or other physical structure) in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s²2s²2p⁶. This means that the 1s, 2s and 2p subshells have 2, 2 and 6 electrons respectively.
The electronic configuration of a type of atom (neutral or ionic) allows us to understand the shape and energy of its electrons. Many general rules are followed in assigning an electron's "position" to its possible energy states, but these assignments are arbitrary and it is always unknown which electron is being described. Knowing the electronic configuration of a species allows us to better understand its binding ability, magnetism and other chemical properties.
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Does alcohol really burn off when cooking? what are the possible substitutions for alcohol in recipes?.
Yes, alcohol burns off when cooking. To make sure that alcohol cooks out completely, you need to cook the food longer. The possible situation for alcohol in recipes is fermentation.
Foods undergo fermentation process for saving and storing them for longer periods through preservation.
In general, alcohol is used during fermentation process to increase their storage time.
During fermentation, food is cooked for about 15 minutes. That is why most foods contain almost 40 percent of alcohol in them.
In order to remove alcohol, it is necessary to cook food longer. The longer you cook, the more alcohol cooks out.
However, to remove all traces of alcohol, make sure to cook food for about three hours.
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Draw the structure or structures produced by the catalytic reduction of the given compound, in which h2 is in excess. Draw hydrogen at a chirality center and use wedge‑and‑dash bonds to designate the stereochemistry, if applicable.
Structures produced by the catalytic reduction of the given compound, in which H₂ is in excess are attached as a picture.
Upon the catalytic reduction of the given compound 1-ethylcyclohexa-1,4-diene (missing in question) by using excess hydrogen, two compounds (1R,2S)-1-ethyl-2-methylcyclohexane and (1S,2R)-1-ethyl-2-methylcyclohexane results. One compound has R,S configuration and the other has S,R configuration. By using the CIP rules priorities are given to the groups attached to the chiral carbon. CIP rules are based on the atomic masses of the groups attached so the minimum number is given to the group having the highest atomic mass. As it is a mixture of two enantiomers so we can call it a recemic mixture.
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assume that coal can be represented by the chemical formula c135h96o9ns . if 2.00 tons of coal is burned, what mass of nitrogen in the form of nox gases, is produced by this combustion?
If 2.00 tons of coal is burned, then the mass of nitrogen in the form of nox gases, is produced by this combustion is 400134 g of nitrogen.
The chemical reaction equation can be written as
C135H96O9NS + 156O2 ------- 135CO2 + 48H2O + NO + SO2
Mass of 2.0 tons of coal in gram = 1.814 × 10^(6) g
Molar mass of C135H96O9NS can be calculated as = 135(12) + 96(1) + 14 + 32 = 1904 moles of coal
Now, number of moles of coal burned = 1.814 × 10^(6) g / (1906 g/mol) = 952.7 moles of coal
If 1 mole of coal produced 1 mole of NO
Total 952.7 moles of coal produced 952.7 moles of NO
Mass of NO can be calculated as
Mass of NO produced = 952.7 × 30 = 28581 g
1 mole of NO = 30 g of NO
Thus, 14 g of nitrogen is contained in 30 g of NO
Let xg of nitrogen is contained in 28581 g of NO
Then,
x = 14 × 28581 = 400134 g of nitrogen.
If 2.00 tons of coal is burned, then the mass of nitrogen in the form of nox gases, is produced by this combustion is 400134 g of nitrogen.
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the molar heat of fusion of water is 6.02 kj/mol. calculate the energy required to melt 46.8 g of water.
When the molar heat of fusion of water is 6.02 kJ/mol, it takes 15.4 kJ of energy to melt 46.8 g of water. The enthalpy of a substance changes due to heat of fusion , which releases energy.
To convert a substance from a solid to a liquid while maintaining pressure, a certain amount of the substance must be used.
A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state heat of fusion that is employed in numerous measurements in chemical, biological, and physical systems while the pressure is constant. Called enthalpy
46g/18g equals mols of water.
mole-1 equals 2.56 mole
1 mole melts at a temperature of 6.02KJ of heat.
Heat needed to melt 2.56 moles is equal to 6.02kJ*2.56 = 15.4kJ.
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determine the empirical formula of a mineral having the percent composition: 28.59% o, 24.95% fe, 46.46% cr.
The empirical formula of a mineral is FeCr2O4.
What is known as empirical formula?
The definition of an empirical formula for a compound is one that displays the ratio of the components present in the complex but not the precise number of atoms in the molecule. Subscripts are used next to the element symbols to indicate the ratios.
Explanation:
[tex]O: 28.59 g x 1 mole O/16 g = 1.79 moles OFe: 24.95 g x 1 mole/55.8 g = 0.447 moles FeCr: 46.46 g x 1 mole/52 g = 0.893 moles CrDividing through by 0.447 one gets 4O, 1Fe and 2CrEmpirical formula = FeCr2O4[/tex]
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The ratio between the components is the empirical formula. Presented as; FeCrO₃.
Why is the empirical formula?Typically, the equation is used to only show the components of a molecule. When one wishes to rapidly identify the elements they are working with, this is helpful. When you want to learn how many atoms of each element are present in the molecule, the chemical formula is the most helpful.
Briefing:Divide the percentage composition by the atomic mass of the elements
Fe =24.95 / 55.845 = 0.4467
Cr = 46.46 / 51.9961 = 0.8935
O = 28.59 / 16 = 1.78
Step 2:
Divide all though by the smallest number (0.4467)
Fe = 0.4467 / 0.4467 = 1.002
Cr = 0.8935 / 0.4467 = 1
O = 1.78 / 0.4467 = 3.038
The ratio between the components is the empirical formula. Presented as; FeCrO₃
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13. Identify two elements on Mendeleev's table that combines with oxygen in the same ratio
as magnesium.
14. Identify one characteristic used by Mendeleev to develop his classification system of
the elements.
15. State one difference between Mendeleev's Table and the Modern Periodic Table.
Two elements on Mendeleev's table that combines with oxygen in the same ratio as magnesium are Beryllium and Calcium.
They form in a ratio of 1:1 with oxygen.
What is the reason behind Berylium and Calcium in the ratio of 1:1 with oxygen?
The one-to-one charge ratio results in the formula CaO. Calcium and Oxygen have iconic bonding because calcium loses two electrons and oxygen gains two to complete their octet.
BeO can be produced by the reaction between beryllium and oxygen .In this reaction , each Be atom loses its two valence electrons to 0 atoms , forming Be2+ions and O2- ions. The electrostatic attraction between the oppositely charged ions forms the iconic bond .
One characteristic used by Mendeleev to develop his classification system of the elements:
Mendeleev was directed by two variables: Expanding nuclear masses, and Gathering of components having comparative properties. Mendeleev thought about formulae of hydrides and oxides as one of the fundamental models for order, among substance properties.
One difference between Mendeleev's Table and the Modern Periodic Table is :
Mendeleev's periodic table is based on atomic mass whereas +The modern periodic table is based on the atomic number.
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what is the concentration of ammonia ( n h 3 ) in solution if 24.60 ml of 0.1080 m hcl is needed to titrate a 250 ml sample of the ammonia solution to the end point?
According to the given statement A solution's ammonia concentration will be 0.0106 M.
What is concentration in chemistry?The amount of solute contained in a specific solution volume is the substance's concentrations. The molarity of solute for 1 L of solution, or molarity, is used to express quantities.
Briefing:NH₄OH(aq) + HCl (aq)⇒ NH4Cl(aq) + H2O (l)
According to the neutralization law,
n[tex]_1[/tex]M[tex]_1[/tex]V[tex]_1[/tex] = n[tex]_2[/tex]M[tex]_2[/tex]V[tex]_2[/tex]
where,
M[tex]_1[/tex] = molarity of HCl solution = 0.1080 M
V[tex]_1[/tex] = volume of HCl solution = 24.60 ml
M[tex]_2[/tex] = molarity of NH₄OHsolution = ?
V[tex]_2[/tex] = volume of NH₄OH solution = 250.0 ml
n[tex]_1[/tex] = valency of HCl = 1
n[tex]_2[/tex] = valency of NH₄OH= 1
1 * 0.1080 M * 24.60 = 1 * M2 * 250.0
M2 = 0.0106
As a result, a solution's ammonia concentration will be 0.0106 M.
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1.96 g h2 is allowed to react with 9.78 g n2 , producing 1.46 g nh3 . part a what is the theoretical yield in grams for this reaction under the given conditions?
The theoretical yield in grams for this reaction under the given conditions is 11.05g.
What is theoretical yield?The theoretical yield is the greatest amount of a product that can be produced in a chemical reaction. It can be determined using the chemical equation with balance. the relative formula mass, mass, and mass of the limiting reactant, as well as the relative formula mass of the result
Given,
Mass of H₂ = 1.96 g
Mass of N₂ = 9.78 g
Molar mass of H₂ = 2 g/mol
Molar mass of N₂ = 28 g/mol
Lets calculate the moles of N₂ and H₂,
Moles of H₂ = [tex]\frac{given mass}{molar mass}[/tex]
H₂ = [tex]\frac{1.96}{2}[/tex]
H₂ = 0.98 mol
same for moles of N₂ = [tex]\frac{given mass}{molar mass}[/tex]
N₂ = [tex]\frac{9.78}{28}[/tex]
N₂ = 0.349 mol
Now, calculate limiting and excess reagent.
The balanced chemical equation is:
3H₂ + N₂ = 2NH₃
From the balanced reaction we conclude that.
As, 3 mole of H₂ react 1 mole of N₂
So, 0.98 moles of H₂ react with 0.98/3 = 0.32 moles of N₂
From this we conclude that, N₂ is an excess reagent because the given moles are greater than the required moles and H₂ is a limiting reagent and it limits the formation of product.
Let us calculate the moles of NH₃
From the reaction, we conclude that
As, 3 mole of H₂ react to give 2 mole of NH₃
So, 0.98 mole of H₂ react to give [tex]\frac{2}{3}[/tex]×0.98 = 0.65 mole of NH₃
Now we have to calculate the mass of NH₃
Mass of NH₃ = Moles of NH₃ × Moles of NH₃
Molar mass of NH₃ = 17 g/m
Mass of NH₃ = 0.65 × 17
Mass of NH₃ = 11.05g
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7. How many moles are 1.20 x 1025 molecules of calcium chloride?
Answer: 6.022 x 10²³ units
Explanation:
What compound is formed from Ca2+ and Cl1-
Answer:
You get CaCl2 (Calcium chloride)
Explanation:
Calcium has a +2 charge and chlorine has a -1 charge. You need the net ionic charge to equal zero so you need two chlorine atoms to have the +2 cancel out. You end up with CaCl2.
Replace this sample text with the prompt or directions for this item.
The atomic number of an element is the number of
The atomic mass is the number of
The electrons in the outermost shell are known as the
protons protons and neutrons
valence electrons
Answer:
1. Protons
2. Protons and Neutrons
3. Valence electrons
Explanation:
the reaction between copper and silver nitrate produces beautiful silver flakes and a bright blue copper (ii) nitrate solution according to the following reaction: cu 2agno3 2ag cu(no3)2 how many moles of agno3 will be needed to completely react with 10.0 g of cu?
0.3147128245 moles of AgNO₃ will be needed to completely react with 10.0 g of Cu.
Determine the number of moles of copper by dividing its mass by its molar mass.
moles Cu = mass Cu / MM Cu
moles Cu = 10.0 g/ 63.55 g/mol
moles Cu = 0.1573564123
Based on the balanced chemical reaction between copper and silver nitrate, 1 mole Cu needs 2 moles AgNO₃ to proceed with the reaction completely.
Cu + 2AgNO₃ ⇒ 2Ag + Cu(NO₃)₂
If there are 0.1573564123 moles Cu, then 0.3147128245 moles AgNO₃ is needed.
moles AgNO₃ = 0.1573564123 moles Cu(2 moles AgNO₃ / 1 mole Cu)
moles AgNO₃ = 0.3147128245
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a ground-state h atom absorbs a photon of wavelength 93.78 nm, and its electron attains a higher energy level. the atom then emits two photons: one of wavelength 2626 nm to reach an intermediate level, and a second to reach the ground state. what was the wavelength of the second photon emitted?
Wavelength of the second photon emitted is 97.3nm. By using the formula E = hc/λ.
What is hydrogen energy level?A photon's frequency and Planck's constant are used to calculate the quantum energy. The relationship between wavelength and frequency is inverse, as seen below.
v = c/ λ
The energy of photon of light: given by the formula,
E = hv
E = hc/λ
Given,
wavelength of photon of light at higher energy level is 93.78 nm.
wavelength of photon of light at intermediate level is 2626 nm = 2626×10⁻⁹m
Etotal = hc/λ
Where,
E is the energy of a photon.
h is the Planck's constant (6.626×10⁻³⁴J⋅s)
c is the speed of light (3.0×10⁸m/s)
λ is the wavelength, wavelength is 93.78 nm.
1nm = 1×10⁻⁹m
Therefore, conversion of 93.78 nm into m is, 93.78nm=93.78×10⁻⁹m
Substitute:
Etotal = [tex]\frac{(6.626 . 10^{-34} )(3.0 . 10^{8}) }{93.78 .10^{-9} }[/tex]
Etotal = 2.12 × 10⁻¹⁸ J
the energy of 1 photon, E1 = [tex]\frac{(6.626 . 10^{-34} )(3.0 . 10^{8}) }{2626 .10^{-9} }[/tex]
E1= 7.57×10⁻²⁰
the energy of 2 photon, E2 = Etotal-E1
E2 = 2.044× 10⁻¹⁸J
wavelength of second photon,
λ = hc/E2
λ = [tex]\frac{(6.626 . 10^{-34} )(3.0 . 10^{8}) }{2.04 .10^{-18} }[/tex]
λ = 9.73 × 10⁻⁸m
conversion of m into nm, 1m = 1×10⁹nm
Therefore, conversion of 9.73×10⁻⁸m into nm is
9.73×10⁻⁸m = 9.73×10⁻⁸×10⁹nm =97.3nm
∴ wavelength of second emitted photon is 97.3nm.
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the species oxidized shows a(n) the species oxidized shows a(n) drop zone empty. the species reduced shows a(n) the species reduced shows a(n) drop zone empty. the species that shows a decrease in oxidation number is the the species that shows a decrease in oxidation number is the drop zone empty. the species that shows an increase in oxidation number is the the species that shows an increase in oxidation number is the drop zone empty. reducing agent. decrease in oxidation number. oxidizing agent.
1) The species oxidized shows a(n) = increase in oxidation number.
2) The species reduced shows a(n) = decrease in oxidation number.
3) The species that shows a decrease in oxidation number is the = oxidizing agent.
4) The species that shows an increase in oxidation number is the = reducing agent.
What do you mean by oxidation and reduction?The degree of biological activity controls both the formation of zones where specific redox processes predominate and the progression of environmental redox reactions. Anoxia, which are situations when the concentration of dissolved molecular oxygen is extremely low, is a requirement but not a sufficient condition for lowering conditions. The active microbial population shifts from communities that depend on aerobic respiration, in which molecular oxygen serves as the terminal electron acceptor, to anaerobic respiration, in which other chemical substances take the place of molecular oxygen as the terminal electron acceptor supporting respiration, as a result of the development of anoxia.
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Sold substance a has a melting point at 100c. liquid substance b has a freezing point at 110c. for each substance, identify its state of matter and describe the motion of its particles when the substance is at 115c.
Substance A is a solid at 115° Celsius. Its particles are not moving while Substance B is a liquid at 115° degrees Celsius. Its particles are moving around freely.
Solid particles in substance A are not moving because they are held together by strong intermolecular forces. Liquid particles in substance B are moving around freely because they are not held together by strong intermolecular forces.
Intermolecular forces are the forces that hold molecules together. These forces are much weaker than the covalent or ionic bonds that hold atoms together in a molecule, but they are strong enough to keep molecules from flying apart. The four main types of intermolecular forces are dipole-dipole forces, London dispersion forces, hydrogen bonding, and ion-dipole forces.
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The incomplete table below shows selected characteristics of gas laws.
Name
Variables
Constants
Equation
?
?
PV = k
Charles's law
?
V= kT
?
Temperature, pressure
?
P= kT
Combined gas law
Pressure, temperature, volume
?
?
Which constants would most likely be filled in the first row of the table?
O temperature and moles of gas
• volume and temperature
pressure and volume
O pressure and moles of gas
The complete table shows characteristics of gas law :
Variables constant Equation
Boyles law pressure , volume Temperature PV = k
Charles law volume ,temperature pressure V = kT
Gaylussac law pressure, temperature volume P = kT
combined pressure, temperature no. of moles PV = kT
gas law volume
1) The Boyles law states that : The pressure of the gas is inversely proportional to volume of gas.
P ∝ 1/V
PV = k
k is constant
2) The Charles law `states that at constant pressure the volume is directly proportional to temperature of gas.
V ∝ T
V = kT
3) The gay - lussac law states that at constant volume pressure is directly proportional to temperature.
P ∝ T
P = kT
4) The combined gas law is the combination of temperature , pressure and volume .
PV = kT
Thus, The complete table shows characteristics of gas law :
Variables constant Equation
Boyles law pressure , volume Temperature PV = k
Charles law volume ,temperature pressure V = kT
Gaylussac law pressure, temperature volume P = kT
combined pressure, temperature no. of moles PV = kT
gas law volume
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Answer:
The answer is A: temperature and moles of gas
Edge 2023
18 in scientific notation
Move the decimal so there is a non-zero digit to the left of the decimal point. The number of decimals you move will be the exhibitor on the 1010. If the decimal has been moved to the right, the exponent will be negative. If the decimal has been moved to the left, the exponent will be positive.
[tex]1.8 \times 10 { }^{1} [/tex]
