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propoxypropane

C6H5CH(CH3)2+O2→(CH3)2CO+C6H5OH

3-methlypropaneoxyethane

Iska IUPAC name: - 2-methoxi butane& iska common name: - ethyl secondary-butyl ether

Law of constant proportion states that a pure chemical compound always consists of the same elements that are combined together in a fixed (or definite) proportion by mass.

Law of constant proportion state that In a chemical substance elements are always present in a definite proportion by mass. For eg. In ammonia nitrogen and hydrogen always present in the ratio 14:3 by mass whatever the method or the source from which it is obtained.

Matter can neither be created nor be destroyed , this law is conservation of mass.

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Inertia throws the passengers forward in a braking car. The car underneath our body is decelerating and wants to make anything that is in contact with it slow at the same rate. The floating balloon, however, isn’t touching the car. It’s only floating in the air, which is not moving at the same speed as the car. If it were, we would feel a breeze. So the car is still moving forward and the balloon stays floating in the air. The car simply moves forward leaving the balloon behind, and it gets trapped at the rear of the car.

Mass of K2SO4, w= 25 mg= 0.025g(use 1 g= 1000 mg )Volume V= 2 literT = 25 + 273= 298 K (add 273 to convert in Kelvin)Thereaction of dissociation of K2SO4K2So4→ 2K++SO42-Number if ions produced= 2+ 1= 3So van’t Hoff factor i= 3

Use the formula of Osmotic pressureπ=i n/v RT=i w/MV RT

Gas constant, R = 0.0821 L atm K-1mol-1

Molar mass of K2SO4,M= 2 × 39 + 1 × 32 + 4 × 16 = 174 g mol-1Plug the values we getπ=3×(0.025/174)×(1/2)×0.0821×298=5.27×10^-3 atm

u have done wrong ...

9x+ 6y - 7 = 0 3x + 2y + 6 = 0 9x + 6y + 18 = 0 distance is 18+7 = 25 so equidistant line 9x + 6y + 12.5 = 0

एक परमाणु में इलेक्ट्रॉन विशिष्ट ऊर्जा स्तरों (1, 2, 3, और इसी तरह) में निहित होते हैं जो नाभिक से अलग दूरी होते हैं। ऊर्जा स्तर की संख्या जितनी बड़ी होगी, यह केंद्रक से उतना ही दूर होगा। इलेक्ट्रॉन जो उच्चतम ऊर्जा स्तर में होते हैं, वैलेंस इलेक्ट्रॉन कहलाते हैं।

Option-B

Electroplatingis used to coat one metal with another metal by using electrolysis. Electroplating is usually done to improve the appearance of the metal or prevent the corrosion of the metal.Chromium plating is used to prevent iron from rusting.

Extraction Of Reactive Metals

Reactive metals are the metals that occupy the top positions in the electrochemical series. Metals that are higher than zinc in the electrochemical series are extracted using electrolysis. These very reactive metals cannot be extracted by other metals such as reduction with carbon. The reactive metals are obtained by electrolyzing a molten ionic compound of metal.

Production of Chemicals:

Many chemicals such as caustic soda (NaOH) chlorine gas etc. are manufactured by electrolysis on large scale. Potassium permaganate hydrogen and oxygen etc. are also produced by electrolysis on a large scale.

In activity series silver is placed below the copper. hence copper is more reactive than silver.

The more reactive element can displace the less reactive element from its solution.take two test tubes in test tube -1 take silver Sulphate solution(white in color) & in test tube-2 take copper Sulphate solution (blue in color). Add copper turnings to test tube -1 and add silver piece to test tube -2 keep the test tubes undisturbed for 15 minutes. After sometime observe the color changes in both test tubes. The color in test tube – 1 changed from white to blue and there is no color change in test tube-2.this indicates in test tube-1 copper displaces silver from its silver Sulphate solution forms copper Sulphate. And in test tube- 2 no displacement reaction takes place. Hence from this experiment we are proving that copper is more reactive than silver.

Ans :- Osmotic pressure is the minimum pressure which needs to be applied to a solution to prevent the inward flow of its pure solvent across a semipermeable membrane. It is also defined as the measure of the tendency of a solution to take in pure solvent by osmosis.

Osmotic pressure is a colligative property I.e. it depends upon number of particles of solute present in the solution. In case of solute which undergo association or dissociation, osmotic pressure is not normal ,it is more or less than the expected.

Copper show abnormal electronic configuration because it is more energy efficient to have a full lower energy orbital than high energy orbital.

4s has higher energy than 3d when it contains electrons i.e. copper with [Ar] 3d^10 4s^1 configuration is in lower energy state than copper with [Ar] 3d^9 4s^1 configuration.

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TheHaber Processcombines nitrogen from the air with hydrogen derived mainly from natural gas (methane) intoammonia. The reaction is reversible and the production ofammoniais exothermic. The catalyst is actually slightly more complicated than pure iron

When one-tenth gram equivalent mass of a substance is present in one litre of its solution then it is called decinormal solution . it is denoted by N/10 solution. Eg if 4g NaOH is present in 1000 cc(1litre) of its solution , the solution is known as decinormal solution.

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Given N as the normality, a decinormal concentration would be :

N/10

In this case :

0.5/10 = 0.05

To convert it to N we have :

0.05×2 = 0.1

Using dilution formula :

N₁V₁ = N₂V₂

Where V is the volume and N the normality.

Doing the substitution:

0.5 × 100 = 0.1 × V₂

V₂ = ( 0.5 × 100) / 0.1

V₂ = 500 cm³

Given that the initial volume that was there is 100 cm³ the volume required is :

500 - 100 = 400 cm³

Answer:1)400cm³

Explanation

a decinormal concentration would be :

N/10

Here,

0.5/10 = 0.05

Converting to N :

0.05×2 = 0.1

formula :

N₁V₁ = N₂V₂

Where V is the volume and N the normality.

0.5 × 100 = 0.1 × V₂

V₂ = ( 0.5 × 100) / 0.1

V₂ = 500 cm³

Given that the initial volume that was there is 100 cm³ the volume required is :

500 - 100 = 400 cm³

17. Answer: B)Mg,Ca,Sr

Explanation:

16.B17.D are the right answers

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(B) Mg,Ca,Sr is the correct answer

A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus and minus signs

C9H20 is molecular formula

(aq) denotes aqueous solution

(s) denotes solid

the above image was for the structure of 2- methyl pentane. hence option B is correct

Tissues are groups of cells that have a similar structure and act together to perform a specific function. The word tissue comes from a form of an old French verb meaning “to weave”.

The mass of cells that form the bodies of humans, animals and plants.

Any of the distinct types of material of which animals or plants are made, consisting of specialized cells and their products are called tissue

s–block(alkali metals)ns1–2, where n = 2 – 7

p–block(metals & non metals)ns2 np1–6, where n = 2 – 6

d–block(transition elements)(n–1) d1–10 ns0–2, where n = 4 – 7

Drawbacks of Mendeleev’s periodic table:1. Position of hydrogen: Hydrogen is placed in group I. However, it resembles the elements of group I (alkali metals) as well as the elements of group VILA, (halogens). Therefore, the position of hydrogen in the periodic table is not correctly defined.2. Anomalous pairs: In certain pairs of elements, the increasing order of atomic masses was not obeyed. In these cases, Mendeleev placed elements according to similarities in their properties and not in increasing order of their atomic masses. For example, argon (Ar, atomic mass 39.9) is placed before potassium (K, atomic mass 39.1). Similarly, cobalt (Co, atomic mass 58.9) is placed before nickel (Ni, atomic mass 58.6) and tellurium (Te, atomic mass 127.6) is placed before iodine (I, atomic mass 126.9). These positions were not justified.3. Position of isotopes: Isotopes are the atoms of the same element having different atomic masses but same atomic number. Therefore, according to Mendeleev’s classification, these should be placed at different places depending upon their atomic masses. For example, isotopes of hydrogen with atomic masses 1,2 and 3 should be placed at three places. However, isotopes have not been given separate places in the periodic table.4. Some similar elements are separated and dissimilar elements are grouped together: In the Mendeleev’s periodic table, some similar elements were placed in different groups while some dissimilar elementshad been grouped together. For example, copper and mercury resembledin their properties but they had been placed in different groups. At the same time, elements of group IA such as Li, Na and K were grouped with copper (Cu), silver (Ag) and gold (Au), though their properties are quite different.5. Cause of periodicity: Mendeleev did not explain the cause of periodicity among the elements.6. Position of lanthanoids (or lanthanides) and actinoids (or actinides):The fourteen elements following lanthanum (known as lanthanoids, from atomic number 58-71) and the fourteen elements following actinium (known as actinoids, from atomic number 90 – 103) have not been given separate places in Mendeleev’s table.In order to cover more elements, Mendeleev modified his periodic table

Sublimationis another one of these phase transitions; except in this case, we have a solid turning directly into a gas. As a sublimating material changes from a solid to a gas, it never passes through the liquid state. This image shows water in its three forms: ice, water, and steam. Sublimation is just one of the ways water or another substance can change between its potential phases.

Example:dry ice is one of the most popularexamplesofsublimationinreal life.

Sublimation is reaction , in which solid phase covert into gas phase . but it is never pass through the liquid phase . Example:::----dry ice or solid carbon dioxide sublise

Sublimationis a specialized change of state when a solid substance skips the liquid phase and moves directly into the gas phase. This occurs because the substance absorbs energy so quickly from the surroundings that melting never occurs.ExamplesofSublimation: ... "Dry ice" or solid carbon dioxide sublimes.

option 1 is correct..

cis platine is the anti-cancer drug , that contains

NH3 AND CL

Bond energyofchlorineis greaterthan fluorineandenthalpyis theenergycontent of the system or molecules. Soenthalpy of fluorine is less than chlorine

Bond energyofchlorineis greaterthan fluorineandenthalpyis theenergycontent of the system or molecules. Soenthalpy of fluorine is less than chlorine

Ans :- The ionization enthalpy of nitrogen is more than oxygen because in nitrogen electron is removed from half filled extra Stable 2P orbital which required more energy then configuration of oxygen in which electron is removed from 2p^3 orbital

Oxygen has higher ionisation enthalpy because of smaller size

Ionization energy or we will call it as ionozation potential means the amount of energy required to remove an elctron from the outet most orbital. Now let's see how ionization potential varies from magnesium and alluminum. Lets write the orbital configuration for magnesium and alluminum not violating the hunds rule, aufbau principle and moeller diagram Before going to write the orbital configurations be through with the rules.

The atomic number of magnesium is12. So the orbital configuration is as follows.

1s2 2s2 2p6 3s2.This is the configuration of magnesium or the arrangement of electrons in the shells. See there are no free electrons in the above configuration indeed all are bonded. So if u want to remove an electrom from the outermost shell you must have to remove the electron from 3s orbital (why 3s orbital particularly?)see the alignment of moeller chart then you can get the perfect picture of that. So the energy reauired to remove an elctron from the bonded position is not an easy task so it needs a lot of energy. And the energy would be in terms of eV or in joules.

Consider in the case of Alluminum the atomic number is 13 then write the orbital configuration of that it is as follows.

Al-1s2 2s2 2p6 3s2 3p1.see the difference between the configuration of magnesium and alluminum, here in case of alluminum we found one single electron which is not bonded is in the outermost shell, so it is easy to remove an elctron of such kind and the energy required is even less compared to thr above. So because of the above reason the ionization energy of magnesium is more than the ionization energy of alluminum.

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Greek mathematicianArchimedesis widely considered by many to be the "father of mathematics." He is regarded as one of the leading scientists in classical antiquity and is credited with designing numerous innovative machines, including the screw pump and siege engines

The offspring cells or organisms acquire the genetic information of their parents through a mechanism known as inheritance. Through hereditary, variations between individuals can accumulate and cause species to undergo evolution by natural selection.

n = 4 , l = 3,2,1,0

and for each L value of m is from -l to l

so for l = 3. m = -3,-2,-1,0,1,2,3 for l = 2 m = -2,-1,0,1,2 for l = 1. m = -1,0,1 for l = 0 m = 0

so total = 7+5+3+1 = 16

option b

Conductors are the materials or substances which allow electricity to flow through them. ... The main reason is that being a good conductor, our human body allows a resistance-free path for the current to flow from wire to our body. Conductors have free electrons on its surface which allows current to pass through.

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OTP – One Time Password / ऑने टाइम पासवर्ड.

OTP - one time password

in chemistry full form of OTP = one true pairing

Ans :- A centripetal force is a force that makes a body follow a curved path. Its direction is always orthogonal to the motion of the body and towards the fixed point of the instantaneous center of curvature of the path.

The force which acts towards the centre of a circle...

(i) dry ice, (ii) camphor

iodine and Naptheline balls

1. Cosmic Objects2. Asteroids arerocky and metallic objects3. Satellite crop monitoring4. Maria

Point defects include selfinterstitialatoms,interstitial impurityatoms, substitutional atoms and vacancies. A selfinterstitialatom is an extra atom that has crowded its way into aninterstitialvoid in the crystal structure

Impurity defectsare foreign atoms that replace some of the atoms making up the solid or that squeeze into the interstices; they are important in the electrical behaviour of semiconductors, which are materials used in computer chips and other electronic devices.