In the E2 mechanism, the rate of the reaction is affected by the strength of the bond between the leaving group and the carbon atom, as well as the stability of the resulting carbocation intermediate.
The order of the leaving groups in terms of increasing reaction rate would be:
Slowest: R-F
R-F is a relatively weak bond and the fluoride ion is a very poor leaving group, so the reaction rate would be slow.
R-Br
R-Cl
R-I
Fastest: R-I
R-I is a relatively strong bond and the iodide ion is a very good leaving group, so the reaction rate would be fastest.
R-Cl
R-Br
In short, the stability of the leaving group decreases as the atomic number of the atom increases, and the bond dissociation energy of the leaving group also decreases. So, it is Iodide>Chloride>Bromide>Fluoride.
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Select True or False: When lead-209 undergoes beta decay the balanced nuclear equation for this reaction is:
The statement is False, when lead-209 undergoes beta decay. As the nuclear equation is n ---> p + e- + antineutrino.
Lead-209 is an atom that contains 82 protons and 127 neutrons in its nucleus, meaning that lead-209 is not a neutron. Neutrons are particles that are found in the nucleus of atoms and have no charge. Therefore, lead-209 can't undergo beta decay by emitting a neutron. Beta decay occurs when an unstable nucleus emits a beta particle and an antineutrino, changing the number of protons in the nucleus. The balanced nuclear equation for the beta decay of lead-209 would be Pb-209 (atomic number = 82) --> Bi-209 (atomic number = 83) + e- + antineutrino. The Bi-209 is a isotope of bismuth, which has one more proton than lead-209 and the same number of neutrons.
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Question-- Select True or False: When lead-209 undergoes beta decay the balanced nuclear equation for this reaction is: n ---> p + e- + antineutrino
Which one of the following combinations of names and formulas of ions is incorrect? a. CIO 3 chlorate b. HCO 3 hydrogen carbonate c. NO 2 nitrate
Nitrate NO 2 It is inappropriate to use one of the following ions' names and formulas.
Chlorate's purpose is unknown.Herbicides, explosives, defoliants, paper, leather, dyes, matches, and inks are all made from it. It's also used to make cosmetics and medications. An inorganic salt of sodium with the counter-ion chlorate is known as sodium chlorate. It serves as both a herbicide and an oxidizing agent for bleaching paper.
Where can you find chlorate?Chlorate, an anion, can enter drinking water through a number of different causes, such as the use of hypochlorite or chlorine dioxide as disinfectants, the oxidation of hypochlorite or chlorite by ozone, and pesticide runoff or paper mill discharges that contaminate the source water.
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The Ka values for nitrous acid HNO_2 and hypochlorous HClO) acid are 4.5 10^{-4} and 3.0 10^{-8}, respectively.
A,Which one would be more suitable for use in a solution buffered at pH = 7.0?
B, What other ion would be needed to make the buffer?
Nitrous acid HNO_2 would be more suitable for use in a solution buffered at pH = 7.0.The other ion needed to make the buffer would be the conjugate base of the acid, which in this case would be the nitrite ion NO_2^-.
A, The Ka value is an indication of the strength of an acid; the lower the Ka value, the weaker the acid. Therefore, the hypochlorous acid HClO has a weaker acidity than nitrous acid HNO_2 and would be less suitable for use in a solution buffered at pH = 7.0.
B, Buffers work by maintaining a certain pH by providing a source of a weak acid and its conjugate base. Therefore, the other ion needed to make the buffer is the conjugate base of the acid, which in this case is the nitrite ion NO_2^-.
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If the actual yielsd of a reaction is 50 g and the theoretical yield is 60 g. What is the percent yield.
If the actual yield and percent yield are 51.4g and 77.0%, respectively, calculate the theoretical yield. We predicted a theoretical yield of 13 grams for the reaction of Na with Cl2.
Yield is determined by dividing the principal amount by the net realized return. Gains and returns on stock investments, for instance, can take one of two kinds. On the basis of the chemical equation's stoichiometry, theoretical yield is computed. Experimental data are used to determine the real yield. Calculating the ratio of actual yield to theoretical yield yields the percent yield. The % ratio of the theoretical yield to the actual yield is known as the percent yield. It is calculated as the theoretical yield multiplied by 100% divided by the experimental yield.
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For your new candle-making business, you need to purchase a large amount of a unique scented wax. You plan to charge $9. 95 per large candle. The wax you need is availbale form a U. S. Supplier for $25. 53/1b and also from a German supplier for €11. 90/kg. The current exchange rate is $1=€0. 76 and 1 kg=2. 20 lb
What is the price of the wax from the U. S. Supplier in €/kg?
What is the price of the wax from the German supplier in $/lb
The price of the wax from the U.S. supplier in €/kg would be: €25.53 / 2.20 lb = €11.67/kg.
The price of the wax from the German supplier in $/lb would be $11.90 / 0.76 = $15.68/lb.
This price is calculated by taking the cost of the wax in US dollars and converting it to Euros using the current exchange rate of $1 = €0.76.
This price is calculated by taking the cost of the wax in Euros and converting it to US dollars using the current exchange rate of $1 = €0.76. It's important to note that the price of the wax from the German supplier is higher than the price from the US supplier when converted to dollars per pound.
This is because the price per kg is lower but the conversion to pound makes it higher.
The price of the wax from the U.S. supplier in €/kg would be: €25.53 / 2.20 lb = €11.67/kg.
The price of the wax from the German supplier in $/lb would be $11.90 / 0.76 = $15.68/lb.
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Which one of the following atoms or ions has the largest radius?
A. K+ B. Cl– C. K D. Na
Option (c) is correct. K atom has the largest radius as the atomic size decreases from across the period and potassium is located in the start of period 3 in the periodic table.
According to the Periodic table, atomic size decreases when going from left to right across a period. Atomic size increases when going from top to bottom down a group. If you look at elements that are located in the same group, potassium will have a larger atomic radius when compared with sodium and chlorine. Since potassium is located at the start of period 3, potassium will have a larger atomic radius and thus the largest atomic radius of the four given atoms. Atomic radii vary in a predictable way across the periodic table. From top to bottom in a group, orbitals corresponding to higher values of the principal quantum number (n) are being added, which are on average further away from the nucleus, thus causing the size of the atom to increase.
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Puffy Chalmers was in his room, admiring his Mr. Drought mask, when his mother, Cookie Chalmers, barged into his room. She was so tired of the mask, she ripped it up and threw the pieces into a metal trash can. Then she pulled a bottle of acid out of her purse, and poured it on the mask pieces causing them to bubble, smoke, and change color. Did she change the mask physically or chemically? Explain your answer using evidence and your knowledge of physical and chemical changes. Help
She changed the mask chemically. Burning of the substance with acid is a chemical change.
A new substance with new qualities is created during burning, which is a chemical alteration that cannot be undone. A chemical change is the transformation of one substance into another, the emergence of new compounds with distinct properties, or any combination of these. It happens when two substances mix to create a new material. Baking soda and vinegar producing carbon dioxide, iron rusting, and wood burning are a few examples of chemical changes. The metabolization of food and the production of amylase from the combining of sugar and saliva are only two examples of the many chemical processes that the body produces.
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The piston in the engine of a car converts the energy released by octane combustion into mechanical work that turns the crankshaft. Some of the energy is lost to the environment as heat. What are the appropriate signs on q and w for this process
Thermal energy is transformed into kinetic energy that is, the energy of a moving object in this example, the moving piston by the engine. So, the sign of heat is negative and work done is negative.
A complicated device known as a combustion engine consumes fuel to produce thermal energy, which is subsequently used to drive tasks. In a car, the engine is responsible for generating the kinetic energy needed to turn the wheels. An internal combustion engine is the type of combustion engine used in automobiles. Internal-combustion engines are those found in gasoline or diesel-powered automobiles. Such an engine obtains its power from the heat produced during the combustion of the working fluids that have not yet reacted, the oxidizer-fuel mixture. As the heat is released to convert into the kinetic energy the sign of heat is negative and the sign of work done by the internal combustion of vehicles is negative.
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what is the mole fraction of ethanol c2h5oh in an aqueous solution in which the ethanol concentration is 4.6 molal
The mole fraction of ethanol, C2H5OH is 0.076 that can be calculated by using the density of water.
The mole fraction of any solution is described because the ratio of the quantity of moles of that is present withinside the technique to the entire quantity of moles of all of the additives of the solution. Molarity on the other hand is the ratio of moles to the volume.
Molecular mass of ethanol = 46g
The molarity of the solution is 4.6 molal=4 moles in 1L solution
Molecular mass of water =18g
Density of water = 1kg/m3 = 1000g/L
So, mass of water in 1 l solution = 1000g
So moles = 1000/18 = 55.55 moles
Thus, mole fraction of ethanol= 4.6/(4.6+55.6) =0.076
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Select True or False: As opposed to chemical reaction, nuclear reactions have a significant (measureable) mass change relative to the mass of the reacting species.
The given statement is true as in the radioactive decay results in significant mass loss.
When uranium nuclei go through radioactive decay, a number of their mass is transformed into kinetic energy (the electricity of the transferring particles). This conversion of electricity is determined as a lack of mass. When it decays, a radionuclide transforms right into a one-of-a-kind atom - a decay product. The atoms maintain remodeling to new decay merchandise till they attain a solid country and are now not radioactive. This radioactivity is a part of earth's herbal device and is the principle purpose of warmth in the earth and the using pressure for earth's tectonic device which results in volcanoes, earthquakes and plate tectonics.
Thus, the given statement is true.
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Elements 'X', 'Y' and 'Z' have these atomic radii, in nanometers. X 0.072 nm Y 0.099 nm Z 0.111 nm
When atomic radii are correctly arranged, how might these elements appear in the periodic table? Why?
Elements 'X', 'Y' and 'Z' have these atomic radii, in nanometers. X 0.072 nm Y 0.099 nm Z 0.111 nm. When atomic radii are correctly arranged, the elements appears as z , y and then x across the period.
The atomic radii decreases across the period as we move from the left to right in the periodic table. the atomic radii will decreases as we move from the left to the right in the periodic table because in the period from the left to right the number of the electron will increases.
Thus, the order of the given elements arranged in the period in the periodic table as first z , then y and then x.
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In a first-order decomposition reaction. 33% of a compound decomposes in 7.3 min. How long (in min) does it take for 81.8% of the compound to decompose
In a first-order breakdown reaction, 81.8% of the molecule takes 19.0 min to break down. A compound breaks down in 7.3 minutes by 33%. The human race started to scratch right away.
A means of climbing the food chain. People snatched what they needed from those who were unsuccessful in the same race without regard for anyone else (the producers and the rest of the consumers). First order in both surfactant and acid concentrations, decomposition is a dislocation process of reaction. The process is autocatalytic since acid is produced during the degradation. Reservoir rock, on the other hand, has a sizable absorbing impact.
x = (81.8*7.3)/33 x = 19.0 min
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A balloon of hydrogen is subjected to vacuum. The initial pressure and volume of hydrogen is 0. 95 atm and 0. 55 L. Calculate the final pressure if the final volume is 1. 22 L?
The final pressure if the final volume is 1. 22 L will be 0.4234 atm
To calculate the final pressure of the hydrogen in the balloon if the final volume is 1.22 L, the ideal gas law can be used. The ideal gas law states that PV = NRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.
Since the number of moles and the temperature is not given, we can assume that they remain constant. So we can use the equation PV = k, where k is a constant.
Given the initial pressure and volume of the hydrogen are 0.95 atm and 0.55 L respectively.
0.95*0.55 = k
so k = 0.5175
then the final pressure can be calculated by:
P1V1 = P2V2
0.950.55 = P21.22
P2 = (0.5175) / (1.22) = 0.4234 atm
The final pressure of the hydrogen in the balloon will be 0.4234 atm.
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How is water an exmaple of an molecule and a compound
Answer:
Water is a compound because it is made up of water molecules. There is no such thing as water atoms. Water molecules are made of hydrogen and oxygen atoms, in the definite proportion of two hydrogens for one oxygen.
Explanation:
The difference between a molecule and a compound is this:
A molecule consists of two or more atoms joined by a chemical bond.
A compound consists of two or more different atoms joined by chemical bonds.
Water (H2O) is both a molecule and a compound.
Hydrogen gas (H2) and oxygen gas (O2) are molecules but because the atoms of which they are made are not different, they do not qualify as compounds.
Consider the orbital diagram
shown. Which electron rule is
broken in the diagram?
1
1s 2s
2p
A. Aufbau Principle
B. Hund's Rule
C. Pauli Exclusion Principle
The electron rule is broken in the diagram is: (c) Pauli Exclusion Principle.
What is electron?An electron is a subatomic particle with a negative electric charge. It is found in atoms, and is the main component of electricity. Electrons are incredibly small, measuring only a fraction of a nanometer, and they are around 2000 times lighter than the smallest atom. Electrons are governed by the laws of quantum mechanics and they are move around the nucleus of an atom in discrete orbits. Electrons are responsible for chemical bonding between atoms, and they are essential for the formation of molecules.
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Explain how the following two processes alter the percentage of carbon dioxide in the
atmosphere
(1) combustion
We burn the things that have previously grown in the sunlight-carbohydrates. Hydrogen in the carbohydrates burns to form water which is very harmless. The carbon can be recycled into many different compounds.
The carbon in this material becomes carbon monoxide carbon dioxide, (Poisonous to us mammals) and the carbon or char which can be a nutrient into the soil. Other things that can be burning in the waste will be toxic. Plants will absorb some worst things that humans will spill out so carelessly like: lead, cadmium, and the other toxic metals—and these toxins are very dangerous in the atmosphere
So we can indeed to alter the composition of our atmosphere by burning things. Once our planet had a carbon dioxide in the atmosphere. It was a hell-hole here. It was very hot and the atmosphere was poisonous to higher life forms. Gradually life on the planet primarily plant life has been changed this atmosphere into something clean and wonderful. But we by our careless behaviour could return it into its original poisonous luckily the huge coniferous forests clean our air of carbon and the other pollution. We are eroding one factor of this margin after the another. Glaciation, wetlands, oceans, coral reefs, wild areas—these are our safeguards and one after another they are being lost.
--The given question is incomplete, the complete question is
"Explain how the following two processes alter the percentage of carbon dioxide in the atmosphere. I. Combustion (3) II. Respiration (3)".
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The table shows the nature of the reactants and products formed in a certain type of chemical reaction.
Nature of Reactants and Products
Reactants Products
Ionic compound + Ionic compound Ionic compound + Ionic compound
Which of the following is true about this type of chemical reaction?
It is a single replacement reaction, and all four compounds are different.
It is a double replacement reaction, and all four compounds are different.
It is a single replacement reaction, and each compound has the same set of ions.
It is a double replacement reaction, and each compound has the same set of ions.
The reaction that has been shown in the table above is a double replacement reaction, and each compound has the same set of ions. Option D
What is a reaction?Another word that we can use for reaction is what we call a chemical change. We know that a chemical change is the kind of change that will lead to the formation of a new product. It is an irreversible process as we can not be able to get back the reactants again.
We should note that there are various types of reactions. In a single replacement reaction, you would notice that there is only one substance that reacts and causes a change while in the double replacement reaction, the anions that are in the compounds that underwent the reaction would just exchange anion partners and we would have two ionic products.
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What does 14 mean in c14?
14 mean in C14 is C14 has atomic mass of 14.
The radioactive carbon isotope with the longest half-life, carbon-14, whose decay enables precise dating of archaeological artifacts. Six protons and eight neutrons make up the carbon-14 nucleus, giving it an atomic mass of 14. Additionally, the isotope is employed as a tracer to monitor specific carbon atoms as they undergo chemical or biological changes.
The 14 in C14 represents the number of neutrons and protons in the nucleus of that atom or we can called it atomic mass. Carbon-14: with 6 protons and 8 neutrons, and an atomic mass of 14,
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Prior to making your first extrication cut, you must first stabilize the vehicle. What tool will you use
Cribbing is the tool we use prior to making your first extrication cut in the vehicle
Before making the first extrication cut, it is important to stabilize the vehicle to prevent it from moving and to ensure the safety of the individuals involved in the extrication process. One tool that is commonly used to stabilize a vehicle during extrication is a set of stabilizing struts, also known as cribbing. Cribbing is a set of wooden or composite blocks that are placed under the vehicle to support it and prevent it from moving. The cribbing is typically placed at strategic points, such as the frame of the vehicle or the wheels, to provide a stable base for the vehicle.Additionally, other tools like wheel chocks, jacks, and air bags may be used to provide additional support and stability. The extrication team will assess the situation and choose the most appropriate tool to stabilize the vehicle.
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BRAINLIEST HELP PLEASE. 6. In order to produce CO2, a student put a sample of calcium carbonate in a flask and
added hydrochloric acid using the following equation:
CaCO3 + 2HCI- H2O + CO2 + CaCl2
The student finds the mass of CO2 generated in the lab to be 100 g. If the student
began with 200 g of HCl and excess CaCO3, what was the percent yield of CO2?
On adding 200g hydrochloric acid to excess calcium carbonate, the percent yield of carbon dioxide is equal to 82.84%.
200g of HCl was added to an excess amount of calcium carbonate to produce 100g of carbon dioxide along with water and calcium chloride. The reaction is written as:
CaCO₃ + 2HCl → H₂O + CO₂ + CaCl₂
Since calcium carbonate is excess, two moles of hydrochloric acid gives rise to one mole of carbon dioxide.
To calculate the percent yield, we can use stoichiometry,
The molar mass of hydrochloric acid = 36.46 g/mol
The molar mass of carbon dioxide = 44.01 g/mol
To calculate theoretical yield,
200g HCl/1 × 1 mole HCl/36.46g HCl × 1 mol CO₂ /2mol HCl × 44.01 mol CO₂/ 1 mole CO₂
= 120.707 g
To calculate the percent yield,
The amount of CO₂ produced = 100g
Dividing 100 by the theoretical yield
= 100/120.707 = 0.8284
Now multiplying the value by 100
= 0.8284 × 100 = 82.84 %
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QUESTION 2 What is the uncertainty (in % RSD) of a standard solution prepared by pipetting 20mL of a 0.2487 M (s
The formula for standard deviation is: = (V1/C1) + (V2/C2) +... + (Vn/Cn).
How could we ascertain if the standard solution created using a pipette is correct?Calculating the percent relative standard deviation (RSD) of the measurement will allow us to ascertain the degree of uncertainty in a standard solution created by pipetting 20 mL of a 0.2487 M (stock) solution.
The RSD is determined by multiplying the standard deviation by the mean and then by 100. The formula to determine the standard deviation is: = (V1/C1) + (V2/C2) +... + (Vn/Cn).
Where n is the number of measurements, C is the stock solution's concentration, and V is the volume of solution added.
We are unable to compute the RSD for the given information since you have not provided any information regarding the number of measurements taken.
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Graph the system on a separate sheet of paper and determine the number of solutions it has one solution If it has one
determine its coordinates.
2x + 3y = 12
2x - y = 4
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A chemist reported that 100 gallons of a gas were available in a laboratory. Which property of the gas did the chemist report?
O Length
O Mass
O Temperature
O Volume
A chemist reported that 100 gallons of a gas were available in a laboratory, The property of the gas did the chemist report is volume option - D is correct answer.
Just what is volume?The space occupied by a three-dimensional object is measured using the scalar quantity known as volume. The volume of a liquid or gas is calculated using the container's capacity as the unit of measurement.
A state of matter known as gas lacks a consistent shape and a set volume. They are the least dense and have the most space between their moles.
A gallon is a unit of volume that is used in the American metric system. The volume of gas equals the sum of the moles of gas in the container, which contains 100 gallons of gas.
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Question 6
Since the Moon has no living organisms, which method would be best for determining the age of a Moon rock?
А
radioactive dating
B
law of superposition
С
density of sediment collection
D
fossil and mineral comparison
Me
Radioactive dating measures the rate of decay of radioactive materials in rocks.
What is radioactive dating?Radiometric dating, radioactive dating, or radioisotope dating is a technique used to date things such as rocks or carbon that included trace radioactive contaminants when they were produced. Radioactive dating is a technique for dating rocks and minerals that makes use of radioactive isotopes. This approach is appropriate for igneous and metamorphic rocks that cannot be dated using the sedimentary stratigraphic correlation method. There are around 300 naturally occuring isotopes known. The underlying idea behind radiometric dating is that you can compute the age of a sample by comparing the presence of a radioactive isotope within it to its known abundance on Earth and its known half-life (rate of decay).
Here,
Radioactive dating determines the rate at which radioactive elements in rocks decay.
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The compound NaCl consists of 60.7% chlorine. How many grams of chlorine can be obtained from 49.6 grams of NaCl?
Answer:92.1g
Explanation:
This means that the reaction consumed4.004moles NaCl⋅2 moles Na2moles NaCl=4.004 moles NaConvert this to grams by using the element's molar mass4.004moles Na⋅22.99 g1mole Na=92.1 g
What is the function of a climograph?
Answer:
A climograph is a graphical representation of the climate of a particular location over a period of time. It typically shows the average temperature and precipitation for a specific location over the course of a year, with the temperature plotted on the y-axis and the months of the year plotted on the x-axis.
The primary function of a climograph is to provide a visual representation of the climate of a particular location, which can be useful for understanding the weather patterns and temperature ranges that are typical for that location. Climographs can also be useful for comparing the climate of different locations, as they provide a convenient way to see how temperature and precipitation patterns differ from one place to another.
The down-slope movement of material on Earth is called a slope failure. It is the failure of the slope resulting in transport of debris downhill by
sliding, rolling, falling, or slumping. This is an example of slope failure called
To solve this we must be knowing each and every concept related to landslides. Therefore, the given process describe the landslides process.
What is landslides?Slope collapses are essentially natural calamities that occur in a variety of locations across the world. Slope failures, often known as landslides, define a wide range of mechanisms that produce the outward or downward of slope-forming materials such as rock, soil, or landfills.
The down-slope movement of material on Earth is called a slope failure. It is the failure of the slope resulting in transport of debris downhill by sliding, rolling, falling, or slumping. This is an example of slope failure called landslides.
Therefore, the given process describe the landslides process.
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What is the occurrence of elements properties in which it repeats every after the eight elements?
The occurrence of elements properties in which it repeats every after the eight elements named a periodicity.
Periodicity would be the reappearance of identical features in an element's behavior when it is organized in atomic number-increasing at frequent intervals.
The repeating of a comparable electronic configuration of an element's atoms in its outermost electron shell after such a predetermined regular interval that's what causes periodicity in its properties.
The elements were organized by chemist John A. R. Newland in order of increasing their atomic weight. He gave it the name "the principle of Octaves" and described how a particular collection of qualities recurs every eight places.
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The volume of a given mass of gas varies inversely as its pressure. If the volume is 10dm3 when the pressure is 6atm, Find the pressure when the volume is doubled.
To solve this we must be knowing each and every concept related to ideal gas equation. Therefore, the pressure when the volume is doubled is 3atm.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
rearranging the above equation, we get
P₁V₁= P₂V₂
{ (6atm) (10dm[tex]_3[/tex])} ={ ( P₂) (20dm[tex]_3[/tex])}
P₂ = 3atm
Therefore, the pressure when the volume is doubled is 3atm.
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What is the definition of meter in biology?
The definition of the meter in biology is that the meter scale is used to measure the length. it is first unit of the international system of the units.
The meter is the first unit of the length in the international system of the units. currently the definition of the meter is : The meter can be defined as the length of the path that is travelled by the light in the vacuum during the time interval of 1 / 2999792458 second. The symbol of the meter is m.
The meter scale is used to measure the length or the distance between the two points.
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