Explore topic-wise InterviewSolutions in .

Ahomogeneous mixturehas the same uniform appearance and composition throughout. Manyhomogeneous mixturesare commonly referred to as solutions.

Aheterogeneous mixtureconsists of visibly different substances or phases. The three phases or states of matter are gas, liquid, and solid.

tq

According to doberainer triad the mass of the middle element is the mean of other two elementshence39+7/2=46/2=23option 1

Abundance of an isotope can be calculated as follows :

Let abundance of isotope with atomic mass Z+2 is xThen abundance of isotope Z-1 is 1-x

(Z+2) x + (Z-1)(1-x) = ZSolving we getx=1/3Therefore abundance of Z+2 is = (1/3)*100=33.33 %And abundance of Z-1 is = 1-33.33 =67.66 %

Therefor isotope with atomic mass Z-1 is higher in % abundance.

HCHO + HCN -----> CH2 C(OH)(CN)it is the example of nucleophilic addition reaction, where CN- will make the nucleophilic attack. the product is formaldehyde cyanohydrin

P.O.P. formula - CaSO4.1/2H2O

soft mixture of sand and cement and sometimes lime with water, for spreading on walls, ceilings, or other structures, to form a smooth hard surface when dried.

POP formula = CaSO4.1/2H2o

Plaster of Paris is made up from gypsum. Plaster of Paris contains the calcium sulfate hemihydrates (CaSO4·0.5 H2O). This is prepared by heating the gypsum which contains calcium sulfate dihydrate (CaSO4·2H2O) to a temperature about 150oC (120-180oC). Certain additives are added when heating. Plaster of Paris is a fine, white powder. When it is hydrated it can be used to mould things, and when allowed to dry, it har

P.O.P. is calcium sulphate hemi hydrate (CaSO4.½H2O)it is prepared by heating gypsum (CaSO4.2H2O) at 373K.

Wardly of the base, a return bend at the outer end of said plate, a second plate extending ... plate spaced from and parallel with the Outer face of the wall to provide a saw guide slot,...

plaster of peris ka formula CaSO4. 1/3H2O

Formula of plaster of peris is :- CaSo4.1/2H2O

caso4.1/2h2o is the right answer

P. O. P formula = CaSO4. 1/2H2O

CaSO4.1/2H2o is a substance used in fracture of bone

Now, question says : rate becomes 100 times when pH change 2 to 1 . we know, Then, when pH = 2 , 2 = - log[H⁺] ⇒[H⁺] = 10⁻² M

similarly , when pH = 1 1 = -log[H⁺] ⇒ [H⁺] = 10⁻¹ M

Now, Let rate = r₁ , when pH = 2 then, r₁ = (10⁻²)ⁿ --------------------(1)

when pH changes then, rate will be 100 times of r₁so, 100r₁ = (10⁻¹)ⁿ ------------(2)

dividing equations (2) and (1) , 1/100 = (10⁻²)ⁿ/(10⁻¹)ⁿ 1/100 = (1/10)ⁿ1/10² = (1/10)ⁿ ⇒n = 2

Hence, order of reaction is 2

Read more on Brainly.in - https://brainly.in/question/2541077#readmore

b is write jidkdndifi

before solving this you have to know that

pH=−log[H+]pH=−log[H+]

ielog[H+]=−pHlog[H+]=−pH

ie[H+]=10^−pH[H+]=10^−pH

∴whenpH=1then[H+]=10^−1=0.1

whenpH=2then[H+]=10^−2=0.01

given that whenpHchanges from2to1rate becomes100times

ie when concentration changes from0.01to0.1rate becomes100times

consider an equationdx/dt=k[H+]n

Let when concentration is0.01rate isdx/dt1=k(0.01)n…….(1)

∴when rate is0.1rate is

100dx/dt1=k(0.1)n….…(2)

from(1)and(2)

100=0.1^n/0.01^n

∴100=10^n

∴n=2

∴order=2

Radioactive Elements and Their Most Stable Isotopes. ... Keep in mind, all elements can have radioactive isotopes. ... A good example of this is tritium, a radioactive isotope of hydrogen naturally present at extremely low levels.

Everything around us is made of elements, or different types of atoms. While these atoms are way too small to see, if you break an object or organism down enough, ultimately everything is made of these tiny particles. And although your coffee table or text book might seem pretty stable, some elements break down over time, including some that make up the objects in your house. These areradioactive elements, meaning that they break down over time by releasing energy and turning into different elements. Let's look at how this process happens.

an element subject to spontaneous degeneration of its nucleus accompanied by the emission of alpha particles, beta particles, or gamma rays. All elements with atomic numbers greater than 83 are radioactive. Naturally occurring radioactive elements include radium, thorium, and uranium. Several radioactive elements not found in nature have been produced by the bombardment of stable elements with subatomic particles in a cyclotron. Compare stable element. See also radioactivity.

This is a list or table of elements that are radioactive. Keep in mind, all elements can have radioactiveisotopes. If enough neutrons are added to an atom, it becomes unstable and decays. A good example of thisis tritium, a radioactive isotope of hydrogen naturally present at extremely low levels. This table contains the elements that havenostable isotopes. Each element is followed by the most stable known isotope and itshalf-life.

Note increasing atomic number doesn't necessarily make an atom more unstable. Scientists predict there may beislands of stabilityin the periodic table, where superheavy transuranium elements may be more stable (although still radioactive) than some lighter elements.This list is sorted by increasing atomic number.

Radioactive Elements

ElementMost Stable IsotopeHalf-lifeof Most Stable IstopeTechnetiumTc-914.21 x 106yearsPromethiumPm-14517.4 yearsPoloniumPo-209102 yearsAstatineAt-2108.1 hoursRadonRn-2223.82 daysFranciumFr-22322 minutesRadiumRa-2261600 yearsActiniumAc-22721.77 yearsThoriumTh-2297.54 x 104yearsProtactiniumPa-2313.28 x 104yearsUraniumU-2362.34 x 107yearsNeptuniumNp-2372.14 x 106yearsPlutoniumPu-2448.00 x 107yearsAmericiumAm-2437370 yearsCuriumCm-2471.56 x 107yearsBerkeliumBk-2471380 yearsCaliforniumCf-251898 yearsEinsteiniumEs-252471.7 daysFermiumFm-257100.5 daysMendeleviumMd-25851.5 daysNobeliumNo-25958 minutesLawrenciumLr-2624 hoursRutherfordiumRf-26513 hoursDubniumDb-26832 hoursSeaborgiumSg-2712.4 minutesBohriumBh-26717 secondsHassiumHs-2699.7 secondsMeitneriumMt-2760.72 secondsDarmstadtiumDs-28111.1 secondsRoentgeniumRg-28126 secondsCoperniciumCn-28529 secondsNihoniumNh-2840.48 secondsFleroviumFl-2892.65 secondsMoscoviumMc-28987 millisecondsLivermoriumLv-29361 millisecondsTennessineUnknownOganessonOg-2941.8 millisecon

This is a list or table of elements that are radioactive. Keep in mind, all elements can have radioactiveisotopes. If enough neutrons are added to an atom, it becomes unstable and decays. A good example of thisis tritium, a radioactive isotope of hydrogen naturally present at extremely low levels. This table contains the elements that havenostable isotopes. Each element is followed by the most stable known isotope and itshalf-life.

Note increasing atomic number doesn't necessarily make an atom more unstable. Scientists predict there may beislands of stabilityin the periodic table, where superheavy transuranium elements may be more stable (although still radioactive) than some lighter elements.This list is sorted by increasing atomic number.

Radioactive Elements

ElementMost Stable IsotopeHalf-lifeof Most Stable IstopeTechnetiumTc-914.21 x 106yearsPromethiumPm-14517.4 yearsPoloniumPo-209102 yearsAstatineAt-2108.1 hoursRadonRn-2223.82 daysFranciumFr-22322 minutesRadiumRa-2261600 yearsActiniumAc-22721.77 yearsThoriumTh-2297.54 x 104yearsProtactiniumPa-2313.28 x 104yearsUraniumU-2362.34 x 107yearsNeptuniumNp-2372.14 x 106yearsPlutoniumPu-2448.00 x 107yearsAmericiumAm-2437370 yearsCuriumCm-2471.56 x 107yearsBerkeliumBk-2471380 yearsCaliforniumCf-251898 yearsEinsteiniumEs-252471.7 daysFermiumFm-257100.5 daysMendeleviumMd-25851.5 daysNobeliumNo-25958 minutesLawrenciumLr-2624 hoursRutherfordiumRf-26513 hoursDubniumDb-26832 hoursSeaborgiumSg-2712.4 minutesBohriumBh-26717 secondsHassiumHs-2699.7 secondsMeitneriumMt-2760.72 secondsDarmstadtiumDs-28111.1 secondsRoentgeniumRg-28126 secondsCoperniciumCn-28529 secondsNihoniumNh-2840.48 secondsFleroviumFl-2892.65 secondsMoscoviumMc-28987 millisecondsLivermoriumLv-29361 millisecondsTennessineUnknownOganessonOg-2941.8 millisecon

radioactive element is uranium or plutonium etc.

Elements such as uranium, palladium, thorium are radioactive elements

Uranium, thorium, and palladium are radioactive elements.

Uranium thorium and palladium are radioactive elements

Uranium thorium and palladium are radioactive elements

Uranium thorium and palladium are radioactive elements

Uranium thorium and palladium are radioactive elements

uranium thorium and palladium are radioactive elements

uranium is the right answer

uranium is the exactly answer

Uranium is the right answer

B. Uranium is the answer

uranium ..I'm I right

uranium is the correct answer

uranium is the correct answer

Uranium is used in nuclear fusion

right answer is uranium

Uranium is the correct

(c) urranium is answer that question

Uranium is a radioactive element

uranium is the radio active element

uranium is a radioactive

uranium is correct answer because remaining elements are not radioactive

Uranium is the correct answer

out of three uranium is correct

uranium is a radioactive element

uranium is the right answer

Uranium is radioactive element

uranium is Right answer

Ans :- Carbon-14, the radioactive isotope of carbon used in carbon dating has a half-life of 5730 years, so itdecaystoo fast. It can only be used to date fossils younger than about 75,000 years.Potassium-40 on the other hand has a half like of 1.25 billion years and is common in rocks and minerals.

A/Ao = (1/2)^t/T

A is final amount , t is time , & T is half life

A = Ao(1/2)^t/T

A = Ao(1/2)^560/140

A = Ao(1/2)^4 = (1/16)Ao

Ao = initial amount

A = Ao/16

The amount of element after 560 days is 1/16 of initial amount.

Petrol, paint thinners and removers, benzene, fireworks, blowtorch, butane, propane,

can u plz tell me about how to tackle this question

Eukaryotic Cell Structure

Like a prokaryotic cell, a eukaryotic cell has a plasma membrane, cytoplasm, and ribosomes. However, unlike prokaryotic cells, eukaryotic cells have:

a membrane-bound nucleus

numerous membrane-bound organelles (including the endoplasmic reticulum, Golgi apparatus, chloroplasts, and mitochondria)

several rod-shaped chromosomes

Because a eukaryotic cell’s nucleus is surrounded by a membrane, it is often said to have a “true nucleus. ” Organelles (meaning “little organ”) have specialized cellular roles, just as the organs of your body have specialized roles. They allow different functions to be compartmentalized in different areas of the cell.

The Nucleus & Its Structures

Typically, the nucleus is the most prominent organelle in a cell. Eukaryotic cells have a true nucleus, which means the cell’s DNA is surrounded by a membrane. Therefore, the nucleus houses the cell’s DNA and directs the synthesis of proteins and ribosomes, the cellular organelles responsible for protein synthesis. The nuclear envelope is a double-membrane structure that constitutes the outermost portion of the nucleus. Both the inner and outer membranes of the nuclear envelope are phospholipid bilayers. The nuclear envelope is punctuated with pores that control the passage of ions, molecules, and RNA between the nucleoplasm and cytoplasm. The nucleoplasm is the semi-solid fluid inside the nucleus where we find the chromatin and the nucleolus. Furthermore, chromosomes are structures within the nucleus that are made up of DNA, the genetic material. In prokaryotes, DNA is organized into a single circular chromosome. In eukaryotes, chromosomes are linear structures.Other Membrane-Bound Organelles

Mitochondria are oval-shaped, double membrane organelles that have their own ribosomes and DNA. These organelles are often called the “energy factories” of a cell because they are responsible for making adenosine triphosphate (ATP), the cell’s main energy-carrying molecule, by conducting cellular respiration. The endoplasmic reticulum modifies proteins and synthesizes lipids, while the golgi apparatus is where the sorting, tagging, packaging, and distribution of lipids and proteins takes place. Peroxisomes are small, round organelles enclosed by single membranes; they carry out oxidation reactions that break down fatty acids and amino acids. Peroxisomes also detoxify many poisons that may enter the body. Vesicles and vacuoles are membrane-bound sacs that function in storage and transport. Other than the fact that vacuoles are somewhat larger than vesicles, there is a very subtle distinction between them: the membranes of vesicles can fuse with either the plasma membrane or other membrane systems within the cell. All of these organelles are found in each and every eukaryotic cell.

CCl2 will be involved hereas its a Reimer tiemer reactionthanks

Order of stability carbocations is 3°>2°>1°

Also here.. O atom will delocalize the +ve charge by sharing its lone pair..

so, 1> 3>2>4

option d.

option D is the correct answer

Weight of liquid = 148 – 50 =98 g

Volume of liquid = 98/0.98 = 100 ml = volume of vessel it means, vessel of 100 ml contain ideal gas at 760 mm Hg at 300 K

Weight of gas = 50.5 - 50 = 0.5g

Using, PV = nRT = w/m RT

760/760 * 100/1000 = 0.5/m * 0.082 *300 [n = 0.5/m]

∴ Molecular weight of gas (m) =123

is the best conductor of heat 3

1=мєя¢υяу2=ѕσ∂ιυм3=ѕιℓνєя

1)mercury2)sodium3)silver

1) mercury2) sodium3) silver

1st. Mercury Hg2nd. Sodium Na3rd. Copper cu

While cooking,if the bottom of the vessel is gettingblackened on the outside, it means that: the food is notcookedcompletely. the fuel is not burning completely. ... the fuel is burning completely.

(b) the fuel is not burning completely.

b) is the right answer

(c) is right answer , incomplete combustion of fuel

b is the correct answer me to

option (b) is the right answer

b is the correct answer

b .is the right answer

the correct option is (b) the fuel is not burning completely.

a is the right answer me

fuel is not burning completelyand black lauer is formed due to incomlete combustion of fuel

when the properties of an substance is changed and this change is irreversible in nature . this is called chemical change .like formation of curd one milk converted into curd u cannt change curd into milk.part i and ii is a physical change once it is done u can change them means reverse them but part iii and iv is a chemical change one fuel is burnt it provides energy u cant get fuel again and once rust is formed u cannt get that rusted iron back .

Oxygen, water, atmosphere, pollution, yellow

the process of crystallization

The process of deriving large crystals of pure substances from their solutions is known as crystallisation. It is a physical change. ... Similarly crystals of copper sulphate can be obtained by adding copper sulphate powder to the boiling solution of water and dilute sulphuric acid.

there are n no molecules of cl2. no of moles of cl2 are n/(6.023×10*23)therefore mass is moles × 71n ×71/(6.023×10*23)0.848 ×10*23

0.000058 is the correct ans

0.58*20^-4 is the correct answer

0.001M HCl of 100mL will have 0.001*0.1 moles = 10^-4 moles

1 mole of HCl contains 6*10^23 Cl- ions

Thus 10^-4 moles of will contain 6*10^19 number of Cl ions

free electron density is probability of electron to find the electron in the conduction band

Free Electron Density in a Metal The free electron density in a metal is a factor in determining its electrical conductivity. It is involved in the Ohm's law behavior of metals on a microscopic scale

Free Electron Density in a Metal The free electron density in a metal is a factor in determining its electrical conductivity. It is involved in the Ohm's law behavior of metals on a microscopic scale

The free electron density in a metal is a factor in determining its electrical conductivity. It is involved in theOhm's law behaviorof metals on a microscopic scale. Because electrons are fermions and obey the Pauli exclusion principle, then at 0 K temperature the electrons fill all available energy levels up to theFermi level. Therefore the free electron density of a metal is related to the Fermi level and can be calculated from



Inchemistryelectron densityis the measure of theprobabilityof anelectronbeing present at a specific location. According toquantum mechanics, due to theuncertainty principleon an atomic scale the exact location of an electron cannot be predicted, only the probability of its being at a given position; therefore electrons in atoms and molecules act as if they are "smeared out" in space. For one-electron systems, the electron density at any point is proportional to the square magnitude of thewavefunction.

Thefree electron densityin a metal is a factor in determining its electrical conductivity. It is involved in the Ohm's law behavior of metals on a microscopic scale

I don't no response to George good but he is the one that I dont know this time

he electron density images were calculated using the integral intensities of Bragg reflections. Fig. 6 shows the electron density maps for.

When enthalpy ispositiveand deltaHis greater than zero, this means that a system absorbed heat. This is called an endothermic reaction.

Tq

someone help plzz!!

If that changes, then the neutral value for pH changes as well. At 100°C, the pH of pure water is6.14, which is "neutral" on the pH scale at this higher temperature.

2Ca + O₂ → 2 CaO

80 grams of Calcium reacts with 32 grams of Oxygen in 5:2 ratio to form 112 grams of Calcium Oxide.

Molecular weight of Calcium oxide = 56 grams

56 grams of Calcium oxide contains Avogadro number of atoms (6.023*10^²³) number of atoms.

112 grams of Calcium oxide contains ‘x’ number of atoms.x = (112*6.023*10^²³)/56= 2*6.023*10^²³= 12.046*10^²³

Therefore it contains 12.046*10^²³ number of atoms.

thanks for solving this question for me

India's prime minister is Narendra modi ji

carbon is the element which is used as the standard for atomic mass scale.

Rusting of iron is an oxidation process, i.e. removal of electrons, due to presence of salts (mainly NaCl) in saline water it behaves as an electrolyte. Thus, removal of electrons is favoured hence iron rusts faster.

Mercury

PbCO3+2HNO3=Pb(NO3)2+CO2+H2O

PbCO3 + HNO3 = Pb(NO3)2 + CO2 + H2O

4-chloro-N-phenylethanamide

4 chloro-N-phenylethananide

4- chloro-N-phenylethanamide

4 chloro-N-phenylethanamide

The existence of two or more compounds with the same molecular formula but different properties is known as isomerism.The isomers of hexane are,