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Answer:

According to the colligative properties,relative lowering of vapour PRESSURE is directly PROPORTIONAL to the mole fraction of solute and also the VANT Hoff’s factor.Dissociation of BACL2 in water yields three ions(one Ba2+,2Cl-),which is more than that of NaCl(2 ions).Hence,BaCl2 has a more relative lowering of pressure value.

Explanation:

Using Slater's rules, calculate the effective nuclear CHARGE on a 3P ELECTRON in (a) aluminum and (b) chlorine. Explain how your RESULTS relate to (a) the relative atomic radii of the TWO atoms (b) the relative first ionization energies of the two atoms.

Answer:

According to this theory "ORGANIC compounds are produced only under the influence of some mysterious force EXISTING in the living organisms”. But in 1828 Friedrich Wohler, a German chemist rejected the vital force theory. Wohler synthesized an organic COMPOUND urea by HEATING an inorganic compound ammonium cyanate. Mr.

Explanation:

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ANSWER:

This is the DIAGRAM of evaporation.

Explanation:

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Answer:

The COMPLEX tissue CONSIST of more than one TYPE of cells.All the cells COORDINATE to perform a common function

Answer:

(A) 46.069 g/mol molecular mass of ETHANOL

(B) 222.04 g/mol. molecular mass of KMnO4

Answer:

Explanation:

n air separation plant separates atmospheric air into its primary components, typically nitrogen and oxygen, and sometimes also argon and other rare inert gases.

The most common method for air separation is fractional distillation. Cryogenic air separation units (ASUs) are built to provide nitrogen or oxygen and often co-produce argon. Other methods such as membrane, pressure SWING adsorption (PSA) and vacuum pressure swing adsorption (VPSA) are commercially USED to separate a SINGLE component from ordinary air. High purity oxygen, nitrogen, and argon, used for semiconductor device fabrication.

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ANSWER:

Explanation:

Percentage purity of a substance can be CALCULATED by dividing the MASS of the pure CHEMICAL by the total mass of the sample, and then multiplying this NUMBER by 100.

ANSWER:its evaporation

Explanation:

ANSWER:

HCl+NaOH----- Nacl+H2o

EXPLANATION:

The ANSWER is ATM liter/mole K.

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when co2 and H2O reacts in same RATIO they form CARBONIC ACID

Answer:

Metals

• metals are all solid ,except mercury
• metals generally have a high MELTING point
• they POSSESS a NATURAL shine

Non metals

• non metals be solid liquid or gaseous
• they generally have a low melting point
• non metals have a DULL APPEARANCE

Answer:

Plaster is the common name for calcium

sulphate hemihydrate(CaSO4.1/2H20) made by

heating the mineral gypsum, the common name

for sulphate of lime. Plaster was first made about 9000 years ago, and has been used by ancient

Egyptian, Greek and ROMAN civilizations.

However, it wasn't used on a large scale until

1700s, when it was required to be used in all

construction in PARIS.

In 1666, a fire raged across London, destroying many PARTS of it. In its aftermath, the king of France ordered that all walls made of wood in Paris be immediately covered with plaster, as a protection against such fires. This resulted in large-scale MINING of gypsum which was available AROUND Paris in huge quantities. Thus, during the early 18th century, Paris became the centre of plaster production, and hence the name, plaster of Paris.

Source:Why is the plaster of Paris called so? -

The Times of India

Explanation:

There are three AMINO acids that have BASIC side CHAINS at neutral pH. These are arginine (Arg), lysine (Lys), and histidine (His). Their side chains contain nitrogen and resemble ammonia, which is a base. Their pKa's are high enough that they tend to BIND protons, gaining a POSITIVE charge in the process.

Explanation:

SODIUM CHLORIDE is OBTAINED by mining the deposits and brine SOLUTION is obtained by passing water into the deposits. Hence the salts GET dissolved then the solution is pumped out.

Explanation:

polyester is made USING a chemical reaction involving COAL, petroleum, air and water. Polyester is made up of purified terephthalic acid (PTS) or its dimethyl ester dimethyl terephthalate (DMT) and monotheluene glycol (MEG).

ANSWER:

because there is no SPACES between their PARTICLES .

Answer:

The atomic number (represented by the letter Z) of an element is the number of protons in the nucleus of each atom of that element. An atom can be classified as a particular element based solely on its atomic number. For example, any atom with an atomic number of 8 (its nucleus CONTAINS 8 protons) is an oxygen atom, and any atom with a different number of protons would be a different element. The periodic table (SEE figure below) displays all of the KNOWN elements and is arranged in order of increasing atomic number. In this table, an element's atomic number is indicated above the elemental symbol. Hydrogen, at the upper LEFT of the table, has an atomic number of 1. Every hydrogen atom has one proton in its nucleus. Next on the table is helium, whose atoms have two protons in the nucleus. Lithium atoms have three protons, BERYLLIUM atoms have four, and so on.

<STRONG>Explanation:

Solids are RIGID because the intermolecular forces of attraction that are PRESENT in solids are very strong. The constituent particles of solids cannot move from their positions they can only VIBRATE from their mean positive.

Explanation:

Heat can affect matter by causing it to change state.

During a phase change, the average energy of the particles REMAINS the same, but, the particles are REARRANGING themselves.

SOLID. The particles are TIGHTLY packed TOGETHER.

Gas MOLECULES can DIFFUSE into LIQUIDS

eg. H20 + CO2 = H2CO3

•Your solution is being provided in the attachment.

•Kindly refer it.

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>> The FREQUENCY of photons is - 4 × 10¹⁴ Hz.

>> The wavelength of the photons is - 25 × 10^-16 m.

_________________________

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ANSWER:

ACTUALLY. .... Organic is tough and INORGANIC is EASE ....

ANSWER:

vacent SPACE b/w MOLECULES of WATER

Answer:

the 4th ONE is in correct

Explanation:

in LIQUID the inter molecular spaces are QUITE high and the inter molecular FORCE is less so the particles can move and change their positions so they font have a arrangement in regular order .... refer the IMAGE ....

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ANSWER:

sugar

EXPLANATION:

PLANTS are SYNTHESISED by sugar because they doesn't contain harmones

Answer:

Emulsifiers are amphiphiles that reduce the INTER FACIAL tension between the TWO phases and contribute to the stabilization of DISPERSED droplets with electrostatic or STERIC effects.

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Explanation:

DIFFERENCE between VAPOR and Gas

Vapor is a mixture of TWO or more different PHASES at room temperature, these phases are liquid and gaseous phase. Gas usually contains a single thermodynamic state at room temperature. Vapour has a definite shape of the gaseous particles when observed under a MICROSCOPE.

(1 mole) that is, 17 GM NH3 has 4×6.022×10²³ ATOMS

So, 4.25 gms has X atoms (suppose)

So,

x = 4×6.022×10²³×4.25/17

= 6.022 × 10²³ atoms is your answer.

Answer:

EXPLANATION:

The Wolff Kishner reduction of ketones utilizes hydrazine (NH2NH2) as the reducing agent in the PRESENCE of STRONG base (KOH) in a high-boiling protic solvent (ethylene glycol, HO-CH2CH2-OH, boiling point 197 °C).

The driving FORCE for the reaction is the conversion of hydrazine to nitrogen gas.

This is not exactly a gentle process; heating to almost 200 °C is required to make the reaction occur at a reasonable rate. [note]

The first step is formation of a hydrazone from the ketone (hydrazones are a cousin of imines, which we cover later in the course). Hydrazine (NH2NH2) adds to the carbonyl, and following a series of proton transfer steps, water is expelled. Click here to see an image of the mechanism for hydrazone formation

Once the hydrazone is formed, the real action in the Wolff-Kishner begins!

The NH2 of the hydrazone is reasonably acidic (pKa about 21) and can be deprotonated by strong base at a high enough temperature (the base is likely the conjugate base of ethylene glycol, not KOH). This deprotonation appears to be the rate-limiting step.

The next step is the trickiest: protonation on the carbon. With the caveat that resonance forms don’t really exist, it can be helpful to imagine forming the resonance form of this species that has a negative charge on the carbon, and then protonating it with solvent (ethylene glycol).

This gives a species with a nitrogen-nitrogen double bond , which , after deprotonation by base, decomposes irreversibly to give nitrogen gas and a carbanion (i.e. a negatively charged carbon).

The Clemmensen Reduction

A second way to go about reducing the carbonyl of an aromatic ketone is to use a reaction known as the Clemmensen Reduction. The reductant here is “zinc amalgam” (Zn-Hg) which is used under acidic conditions; one method calls for the presence of aqueous HCl, for example:

This process works best for aromatic ketones; non-aromatic ketones, not so much. The mechanism has not been thoroughly worked out; it’s thought to occur through a series of one-electron transfers from zinc amalgam.

ANSWER:

metanoid acid

Explanation:

OKH....

Answer:

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Information about Modern Periodic Table and its advantages

Posted Date: 20 May 2018 |Updated: 20-May-2018 |Category: Chemistry Projects |Author: Hakimuddin Kuwakhedawala |Member Level: Gold |Points: 45 |

This article will provide you with the information of modern periodic table. You will find the modern periodic law. You will also find the importance of modern periodic table. To know about the modern periodic table, please read this article.

Introduction

In 1911, Moseley discovered atomic number. According to him, PHYSICAL and CHEMICAL properties of elements do not depend upon atomic weight but on atomic number, that is the number of protons and atomic number is the basic properties of elements and not atomic mass. Therefore, Moseley considered atomic number as the basis of classification and not the atomic weight. Moseley proposed the modern periodic law according to which the physical and chemical properties of elements are the periodic functions of their atomic numbers. It means that when elements are placed in increasing order of their atomic number then after regular interval elements of same properties are repeated.

Mendeleev's periodic table was based on atomic masses while in Modern periodic table elements were arranged in the order of increasing atomic numbers in seven horizontal rows (period) and 18 vertical columns (groups). Elements of a group possess SIMILAR valence shell electronic configuration hence they exhibit similar chemical properties.

Study of the electronic configuration of different elements revealed that there is a close relationship between the electronic configuration of elements and their properties. On placing elements in increasing order of their atomic number, elements of the same configuration appear after regular intervals. As a RESULT of which elements of similar properties also appear after regular intervals. Hence periodicity in the properties of elements at a regular interval of atomic number is due to the REPETITION of similar valence shell electronic configuration.

Considering electronic configuration of elements Werner, Bury, Rang, etc. proposed modern periodic table or long form or extended form of periodic table. This table is also called Bohr's periodic table since Bohr, first of all, described the arrangement of electrons round the nucleus of an atom. please give me thanks

Answer:

Nitric Acid - HNO3

Nitrous Acid - HNO2

Hypochlorous Acid - HClO

Chlorous Acid - HClO2

Chloric Acid - HClO3

Potassium Hydroxide - KOH

Ammonium Hydroxide - NH4OH

Calcium Hydroxide - Ca(OH)2

Magnesium Hydroxide - Mg(OH)2

Barium Hydroxide - BA(OH)2

Aluminum Hydroxide - Al(OH)3

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Answer:

Effloresence is the MIGRATION of a SALT to the surface of a POROUS MATERIAL where it forms a COATING

ANSWER:

H2+1/2(O2) =H2O

C+O2=CO2

like this

Answer:

<U>The freezing point of a substance is the same as the MELTING point of its SOLID state.justify this statement with the help of SUITABLE example. Accepted Answer: The melting point of a substance is the temperature at which the substance CHANGES from solid to liquid at atmospheric pressure.

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ANSWER:

no

Explanation:

ANSWER:

Educated MIDDLE class or THIRD eastate peoples.

Answer:

it MAY be 16 gram

Explanation:

BECOZ SOLUTION will dissolve in waterto be light and it will be lighter and have the WEIGHT of 16 g so the answer is 16 gram .......................................

ANSWER:

the MAXIMUM VALUE is 22.4 LITER

ANSWER: its not POISONOUS, But it PAINS a LOT.

EXPLANATION:

Answer:

One way to IDENTIFY a physical CHANGE is that such a change may be reversible, especially a phase change. For example, if you freeze WATER into an ice cube, you can MELT it into the water again. ASK yourself:

Explanation:

Basic SOLUTIONS are CHARACTERIZED by pH values HIGHER than 7 and can conduct electricity. The QUALITATIVE properties of basic solutions INCLUDE slippery textures and bitter flavors. Basic solutions are used to neutralize acids in addition to being useful cleaning agents.

ANSWER:

i. The substance oxidised is hydrochloric acid.

ii. The oxidising AGENT is magnesium oxide.

iii.The substance reduced is magnesium oxide.

iv. The reducing agent is hydrochloric acid.

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ANSWER:

The CONCENTRATION of hydronium ions decreases when an acid is diluted because on adding water the H+ ions of the acid and hydroxyl ions of water react to FORM water MOLECULES and the concentration of hydronium ions decreases. When an acid is diluted, then the concentration of hydronium ions decreases

ANSWER:

EXPLANATION:

A WOODEN table should be CALLED a solid. A wooden table has a definite shape and VOLUME. It is very rigid and cannot be compressed i.e., it has the characteristics of a solid. Hence, a wooden table should be called a solid.

Answer:

A Chemical equation is always balanced on comparison of number of atoms of each element on both sides of the reaction.

During the BALANCING of chemical equation it is need to be followed that “ it has to FOLLOW law of conservation of MASS (mass on reactants side should be equal to mass on the products side)”.

Ex: H2 + O2 → H2O

In the above equation when Hydrogen atoms were compared on both sides of the reaction both are equal and when Oxygen atoms were compared they are not equal. So in this equation Oxygen atoms were not balanced on both sides of the reaction. And balancing of equation is required.

H2 + O2 → 2H2O

Similarly now Hydrogen were not balanced. So it REQUIRES balancing.

2H2 + O2 → 2H2O

Now COMPARING both Hydrogen and Oxygen on both sides then, found equal. So it is a balanced equation.

Answer:

Solids are rigid while gases, and LIQUIDS are not. (ii) Compressibility: The particles of matter can be compressed or reduced in volume by applying force or PRESSURE. ... (v) Shape: Solids have definite shape WHEREAS liquids take the shape of the CONTAINER in which they are placed and gases do not have any shape.