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According to law.
the orbital who is have the LOWER VALUE of (n+l) the ELECTRON first full them.

as 3d have (3+2)=5
4s have (4+0)=4
that is why 4S COMES before the 3d.

Alkali Metals (Here-Potassium)

LESS dense than other metals

one LOOSELY bound valence electron

highly reactive, with reactivity increasing moving down the group

largest atomic radius of elements in their period

low ionization energy

low electronegativity

Alkaline Earth Metals(Calcium/magnesium)

TWO ELECTRONS in the valence shell

readily form divalent cations

low electron affinity

low electronegativity

The halogens and noble GASES are nonmetals, although they have their own groups, too.

high ionization energy

high electronegativity

poor electrical and thermal conductors

form brittle solids

little if any metallic luster

readily gain electrons

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There are four major TYPES (or “ranks”) of coal. Rank refers to STEPS in a slow, natural process called “coalification,” during which buried plant matter changes into an ever denser, drier, more carbon rich, and harder material. The four ranks are:

Anthracite: The highest rank of coal. It is a hard, brittle, and black lustrous coal, often referred to as hard coal, containing a high percentage of fixed carbon and a low percentage of volatile matter.

Bituminous: Bituminous coal is a middle rank coal between subbituminous and anthracite. Bituminous usually has a high HEATING (Btu) value and is the most common type of coal used in electricity generation in the United States. Bituminous coal appears shiny and smooth when you first see it, but look closer and you may see it has layers.

Subbituminous: Subbituminous coal is black in color and dull (not shiny), and has a higher heating value than lignite.

Lignite: Lignite coal, aka BROWN coal, is the lowest grade coal with the least concentration of carbon.

Also, there is peat. Peat is not actually coal, but rather the precursor to coal. Peat is a soft ORGANIC material consisting of partly decayed plant and, in some cases, deposited mineral matter. When peat is placed under high pressure and heat, it becomes coal.

SODIUM ethoxide not sodium metal will FORM Ok --- correct your question

Here is your answer

Sodium metal reacts with ethanol to form sodium ethoxide and hydrogen. The reaction INVOLVED is as follows: 

2C2H5OH + 2Na ==> 2C2H5ONa + H2 

Therefore X is ethanol

                 Y is hydrogen gas

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Not ALONE but YAH in their SALTS they can

3373 MOLECULES of WATER are present in ONE ml of water vapour at NTP

Si unit in chemistry is system of international for example:
The SI base units and their physical QUANTITIES are the metre for measurement of length, the kilogram for mass, the second for time, the ampere for electric current, the kelvin for temperature, the candela for luminous intensity, and the mole for amount of substance.####The frequency, represented by the Greek LETTER nu (ν), is the number of waves that pass a certain point in a specified amount of time. Typically, frequency is measured in units of cycles per second or waves persecond. One WAVE per second is also called a HERTZ (Hz) and in SI units is a RECIPROCAL second (s−1).

28G in a MOLE of that COMPOUND

SCl2 are in the ratio of. 8: 17 and S2CL2 are in the ration of 16: 17

In PHYSICS, intensity is the power TRANSFERRED per UNIT area, where the area is MEASURED on the plane PERPENDICULAR to the direction of propagation of the energy. In the SIsystem, it has units watts per square metre (W/m2).

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Finland is the TOP country to the MEDICINES

WAIT I will GIVE this ....

Generally temporary hardness can be  removed by boiling but PERMANENT hardness can not be removed by boiling.There are some special METHODS LIKE ion EXCHANGE methods to remove permanent hardness

First CONVERT the mass of Calcium given in 'g' to moles 'n' using:

n = m X M

n = 8 x 40.1

n = 320.8 moles

Now using n = N/NA

N = n x NA (Avogadro's NUMBER)

N = 1.93 x [10]x^{23}

SOLUTION:
The HYDRONIUM ion concentration is represented as [H3O+
] and is the unknown quantity.
The hydroxide ion concentration is represented by [OH-
] and is 1
Using the ion product of water, Kw, we have the FOLLOWING relationship:
Kw = [H3O+
] X [OH-
] where Kw = 1 x 10-14 (at 25C)
Solving for the hydronium ion concentration and substituting gives:
Kw 1 x 10-14
[H3O+
] = CCCC = CCCCCC = 1 x 10-5
[OH-
] 1 x 10-9
So the final hydronium ion concentration is 1 x 10-5 M. Comparison of 1 x 10-5 M versus 1 x 10-9 M.

We can divide CARBON DIOXIDE in the FORM of oxygen and carbon by HEATING PROCESS

Nitrophenol is the weakest interms of acidity, now in ORTHONITROPHENOL intramolecular HYDROGEN bonding between the adjacent hydroxyl and nitro groups significantly affects RELEASE of proton so it is weak COMPARED to PARA nitrophenol

The TABLETS CONTAINS the IRON in the POWDERED FORM.

B.o of Co = 1/2(Nb-Na)
=3
B.o of No += 3
Both have the same BOND order
Both are STABLE with LOWER bond lengths

When warmed with chloroform in the PRESENCE of alc. KOH, aniline GIVES offensivesmell of isocyanides while N-methyl aniline does not give this TEST.

☺Thermolytic Decomposition REACTION

It is the reaction in which SINGLE REACTANT decomposes into 2 or more products on heating.
example:-
2Pb(NO3)2---)2Pbo+4NO2+O2



☺Photolytic Decomposition Reaction

It is the reaction in which a single reactant decomposes to form 2 or more products in the PRESENCE of sunlight.
example:-
2Ag+Br2----)2AgBr

An ionic compound has unit CELL CONSISTING of a ions are the corners of a cube AB3
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n₁ = 1.85×10²¹÷ 6.023×10²³

= 0.003 moles

n= m/M.wt.

0.003 = m/187

m= 0.561 g

MASS of X + mass of y = 0.688

MX + 0.561 = 0.688

mx = 0.127 g

n₂ = 1.65×10²¹÷6.023×10²³

n₂ = 0.0028 moles

n₂ = mx/ M.wt

0.0028 = 0.127/M.wt

M.wt = 0.127/0.0028

M.wt. = 47 g/mol.

Both baking SODA and baking powderare LEAVENING agents, which means they are added to baked GOODS before cooking to PRODUCE CARBON dioxide and cause them to rise. Baking powdercontains baking soda, but the two substances are used under different conditions.

No these METALS are very reactive if exposed in air EASILY catch FIRE

Their is no reactivity for 8A group,,,since they are inert in nature,,,,they are CALLED NOBEL gases,,,,they are HIGHLY stable,,,,due to it's octet

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_____________________

》Quicklime in a beaker,a STUDENT feels the beaker turning hot.

➡This is DUE to the REACTION exothermic.

➡Exothermic reaction :- The reaction in which HEAT is produced.

_________________________

Hope you understand..✌

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The normal BOILING point is the temperature in which the vapour pressure of a LIQUID becomes equal to ATMOSPHERIC pressure. If the INTERMOLECULAR FORCES are small, the liquid has a high vapour pressure. ... More heat will be required to separate the molecules, so the boiling point will be higher.

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______________________

⚫Adding water to SUGAR is a PHYSICAL change because it CHANGED as dissolved in water.

➡Physical change :- Changes in physical properties.

⚫Adding water to slaked lime is a chemical change because slaked lime reacts with water and produces heat.

➡Chemical change:- One or more substance at a time reat with ANOTHER substance which are AVAILABLE in environment.

________________________

Hope you understand...✌

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The ATOM no of SODIUM is 11.

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No,the elevation in BOILING point will not be the same. Elevation in boiling point is COLLIGATIVE property and is dependent on the NUMBER of PARTICLES. Nacl is can IONIC compound which dissociates in solution to give ncore particles whereas sugar is made up of molecules which does not dissociates

NOTHING will HAPPEN.....as there is nothing to REACT with....

HOPE it HELPS....

Look....if we will USE IRON or COPPER then bulbs will be costly...and they would not GIVE us THT much amount of light

E-Z NOTATION FOR GEOMETRIC ISOMERISM

This page explains the E-Z SYSTEM for naming geometric isomers.

Important!  If you have come straight here via a search engine, you should be aware that this page follows on from anintroductory page about geometric isomerism. Unless you are already confident about how geometric isomers arise, and the cis-trans system for naming them, you should follow this link first. You will find links back to this current page at suitable points on that page.

The E-Z system

The problem with the cis-trans system for naming geometric isomers

Consider a simple case of geometric isomerism which we've already discussed on the previous page.



You can tell which is the cis and which the trans form just by looking at them. All you really have to remember is that trans means "across" (as in transatlantic or transcontinental) and that cis is the opposite. It is a simple and visual way of telling the two isomers apart. So why do we need another system?

There are problems as compounds get more complicated. For example, could you name these two isomers using cis and trans?



Because everything attached to the carbon-carbon double bond is different, there aren't any obvious things which you can think of as being "cis" or "trans" to each other. The E-Z system GETS around this problem completely - but unfortunately makes things slightly more difficult for the simple examples you usually meet in introductory courses.

How the E-Z system works

We'll use the last two compounds as an example to explain how the system works.

You LOOK at what is attached to each END of the double bond in turn, and give the two groups a "priority" according to a set of rules which we'll explore in a minute.

In the example above, at the left-hand end of the bond, it turns out that bromine has a higher priority than fluorine. And on the right-hand end, it turns out that chlorine has a higher priority than hydrogen.



If the two groups with the higher priorities are on the same side of the double bond, that is described as the (Z)- isomer. So you would write it as (Z)-name of compound. The symbol Z comes from a German word (zusammen) which means together.

Rutherford's alpha particle SCATTERING experiment changed the way we think of atoms. ... Rutherford directed beams of alpha PARTICLES (which are the nuclei of helium atoms and hence positively CHARGED) at thin gold foil to TEST this model and noted how thealpha particles scattered from the foil.



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I can't UNDERSTAND your QUESTION...

HII

FORMULA FOR CABOXYLIC AVID:-----
COOH

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• Here is your ANSWER !!
• IMAGE has answer !
• Image ATTACHED !!

The boiling WATER can't get above 212 degrees, and the PAPER is THIN enough that this water KEEPS it temperature from climbing high enough to combust. it's only then the water on the other side of the paper entirely boils away the paper cup will burn away.....