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ANSWER:

Number of shells increase .

Atomic size increases

nuclear force of ATTRACTION decrease DUE to that. electron will not be EASILY added so LESS energy is released

Answer:

MANDELEEV named Scandium(Sc) as EKA- + boron.

Lars Fredrik Nilson later named it as Scandium. In LATIN it means Scandinavia.

Hope it will help you.

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Explanation:

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here's UR ans

bcz in

He2 =

no.of bonding ORBITALS= no.of antibonding orbitals

so bond ORDER is 0

due to which He is stable

Answer: since compound has equal WEIGHTS of X and Y so,

Let the WEIGHT be a,

So according to question molar mass of the compound is given as 120g so,

a+a=120

2a=120

a=60g

So, MOLES of X in the compound = 60/30= 2moles and of Y = 60/20= 3moles. So, the REQUIRED FORMULA will be X2Y3.

Explanation:

Answer:

6.022×10^23×7×128

Explanation:

MOLECULES present in one gram of h2so4=6.022×10^23

molecules present in 128 gram=6.022×10^23×128

atoms In one MOLECULE of h2so4=7

total no. of atoms present in 128 G of h2so4=6.022×10^23×128×7

Answer:

MASS CONSERVATION is a property that depend only on the AMOUNT of SUBSTANCE

Answer:

HCL is IONIC because it has TWO IONS H+ and Cl-

EXPLANATION:

In ORDER to prove the presence of diffuse air in fresh water, when the water is heated, the BUBBLES are formed, which skip the SURFACE.

The properties of water consist of dissolved gases THEREFORE on heating they become lighter and rise above the surface and in order to escape into the air, they form bubbles.

This experiment proves that air has its presence in the water.

Answer:

A pure substance has UNIFORM COMPOSITION and properties in all its parts, as it consists of particles of only one kind. For EXAMPLE, sugar and salt are pure substances.

2. It has certain characteristics such as specific temperatures at which it melts and boils. For example, pure water boils at 100°C.

3. The constituents, which make up a pure substance cannot be SEPARATED by physical means.

Mixtures are impure substances.

1. A substance is said to be impure if it has particles of other substances mixed in it.

2. The constituents of impure substances may be PRESENT in any ratio.

3. The constituents of an impure substance retain their individual properties. For example, the properties of iron and sand do not change when they are mixed together.

The constituents of an impure substance can be separated by physical means.

Explanation:

ANSWER:

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It can be removed by using a water SOFTENER which works on the principle of ion exchange in which calcium and magnesium ions are EXCHANGED with SODIUM or potassium ions, reducing the concentration of hardness minerals to tolerable levels and thus making the water softer and giving it a smoother feeling.

EXPLANATION:

Electricity is CONDUCTED in CRYSTAL elctron that present in relatively free . But in case of heat , each carbon atom is covalently BONDED with fo other carbon atom and there are no free electons present .

I HOPE u understand.

ANSWER:

HOPE this is USEFUL........

Answer:

.

aviation turbine fuel

The Seta Smoke POINT Apparatus determines the smoke point of KEROSINE and aviation turbine fuel by measuring the MAXIMUM flame height prior to smoke formation and comparing the results with those of known standards.

Explanation:

Smoke point. The smoke point also known as BURNING point of an oil or fat is the temperature at which, under specific and defined conditions, it begins to produce a continuous BLUISH smoke that becomes clearly visible. ... The higher in quality and the lower in FFA, the higher the smoke point.

Answer:

Answer Given Conetration of SrCl2 = 10 −3 mol% ... So CATION VACANCIES PER mole of NaCl = 10–5 X 6.022 x1023

ANSWER:

C4H9NO2

3-methylamino PROPANOIC ACID

ANSWER:

REFER any REFERENCE BOOK.........

If the saturated liquid is a multi-component liquid (for example, a mixture of propane, isobutane and normal butane), the FLASHED VAPOR is richer in the more volatile components than is the REMAINING liquid.

Explanation:

Hey mate

Anti markovnikov rule is gonna to be followed here

Butanol is formed

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Answer:

basically pH scale is used to MEASURE the value of a SOLUTION to classify whether or is a base or an acid. if the value of the solution is more than 7 it is a base. of it is LESS than 7 it is an acid. of it is exactly 7 it is NEITHER base nor acid.

ANSWER:

IONS which MAKES it ALKALINE

Answer:

Zeolites

ZSM5

Explanation:

A catalytic reaction which depends upon the pore structure of the catalyst and on the size of the reactant and the product molecules is called shape selective catalysis.

EXAMPLES include:-

Zeolites-Zeolites have a rigid, 3-dimensional CRYSTALLINE structure consisting of a network of interconnected TUNNELS and cages. Water and ions move FREELY in and out of these pores but the zeolites framework remains rigid. The pore and channel sizes are nearly uniform, ALLOWING the crystal to act as a molecular sieve.

ZSM5-Structure of  ZSM-5 contains two intersecting channel systems of specific shape which restrict molecular diffusion through the framework.

Answer:

whereas an impure SUBSTANCE have two or more than two particle! A PURE element or compound contains only one substance, with no other substances mixed in. Impure materials MAY be mixtures of elements, mixtures of compounds, or mixtures of elements and compounds

Explanation:

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ANSWER:

SORRY do not KNOW SMALL enough

ANSWER:

RESIDUE is the SUBSTANCE which is left on the FILTER PAPER while the filtrate is the liquid which passes through the filter paper

Answer:

17 is the ROOT SQUARE of the NUMBER

Answer:

f orbital has diffused shape and exists next to d orbital. SINCE, shielding effect is DEFINED as a reduction in the effective NUCLEAR charge on the electron cloud, due to a difference in the ATTRACTION forces of the ELECTRONS on the nucleus

Answer:

The molar MASS of a substance is the mass of one MOLE of that substance.

The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in GRAMS PER mole, and is equal to the mass of 6.022 × 1023 atoms, molecules, or formula units of that substance.

ANSWER:

PROBABLY the STEEL is the RIGHT ANWER

Answer:

Carbohydrates are used as -:

Production of pulp from wood cellulose, applications of starch for paper MAKING as well as uses of GLUCOSE and saccharose for fermentation are the most IMPORTANT chemical and technical uses of carbohydrates. Carbohydrates used as fermentation feedstock are ESSENTIAL for the chemical industry.

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Answer:

The reactant have maximum

no.of moles÷Stoichiometric coefficient

ratio is in excess.

Explanation:

When we BALENCE any CHEMICAL reaction,

the numbers GOT are stoichiometric coefficients.

e.g,

N2 + 3H2 ===} 2 NH3.

here,

stoichiometric coefficients of N2 , H2 & NH3 are 1,3 & 2 RESPECTIVELY.

Answer:

mole FRACTION of SOLUTE is 0.082

Explanation:

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Answer:

2) 11.2l

Explanation:

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Answer:

4 STRUCTURAL isomers

Explanation:

there are a total of 4 structural isomers of C₄H₉OH i.e. butanol. They are as FOLLOWS:-

1-butanol

2-butanol (or sec-butanol)

isobutanol (or 2-methyl-1-propanol)

tert-butanol (or 2-methy;-2-propanol)

0.98

Explanation:

is the RIGHT ANSWER

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Answer:

DUE to accumulation of HOT air

Explanation:

there is no WAY of ESCAPING hot air in cooker due to which it LEADS increase in Temperature and pressure

Answer:

i HOPE u will like it and i TRIED to EXPLAIN it in EASY way

Explanation:

Since Cr2(SO4)3 is a molecule, it's oxidation number is 0. And the oxidation number of (SO4) is ALWAYS -2. THEREFORE, the oxidation number of Cr in Cr2(SO4)3 is +3.

ANSWER:

Xerox MULTI FUNCTION is a FASTER printer...

hope it helps you...

the WEIGHT of TWO LITRES of OXYGEN

Explanation:

32g

ANSWER:

I THINK 4 NUMBER is the answer

ANSWER:

the pressure COOKER work FASTLY and it's reason of scintific that pressure cooker save lpg and time you can UNDERSTAND my LANGUAGE

ANSWER:

2 molecules

Explanation:

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Answer:

5.86 × 3.96 ÷ 2.86

= 8.1138461538.

Answer:

An electrolytic process is the USE of electrolysis industrially to REFINE metals or COMPOUNDS at a high purity and low cost. Some examples are the Hall-Héroult process used for aluminium, or the production of hydrogen from water. Electrolysis is usually done in bulk using hundreds of sheets of metal connected to an electric power source. In the production of copper, these pure sheets of copper are used as starter material for the cathodes, and are then lowered into a solution such as copper SULPHATE with the large anodes that are cast from impure (97% pure) copper. The copper from the anodes are electroplated on to the cathodes, while any impurities settle to the BOTTOM of the tank. This forms cathodes of 99.999% pure copper.

ANSWER:

where are the OPTIONS....

ANSWER:

A COMPOUND is a substance made up of two or more elements chemically combined in a FIXED proportion by MASS. A compound cannot be separated into its component by physical methods. Mixtures: A mixture is a substance which CONSISTS of two or more elements are compounds not chemically combined together.

Answer:

SODIUM (NA) and potassium (k) react VIOLENTLY with water and LITHIUM (li) reacts slowly.....

Answer:

hi here your answer

Explanation:

EARTHEN pots have small pores through which the WATER seeps and as evaporation leads to cooling of the SUBSTANCE. In an earthen pot, water GETS evaporated QUICKLY through the pores. Cooling is caused by evaporation.

Hence, the answer.

Answer:

Explanation:

When temperature is decreased to 0*C, water turns into ICE. Whereas, when temperature is increased to 100*C, water is CONVERTED to steam. Water as steam has more latent heat than water in LIQUID and SOLID FORM. Hence, water as steam can cause severe burns while water as ice has a cooling effect.

ANSWER:

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