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Dry ice is chemically solid CO2.
Due to it's charactersticks(ice LIKE colour,LOW friction SURFACE,no melting at room TEMPERATURE etc.) it is called dry ice.

Actinides IONS are usually colored. The color depends upon the number of 5f ELECTRONS, ions with 5f 0 electrons and 5f 7 electrons are colorless. The color is due to f-f electronic transitions.

==>Complex FORMATION of Actinide elements

The degree of complex formations decreases in the order:

An+4 > AnO2+2 > An+3 > AnO2+

The complexing power of DIFFERENT singly charged and doubly charged anions follows the order:

Singly charged anions: F-> No3-> Cl-

Doubly  charged anions: Co3-2> Ox-2> So4-2

Actinides also form complexes with a large number of organic substances.

Molecule is the general term used to describe any atoms that are connected by chemical bonds. Every combination of atoms is a molecule. A compound is a molecule made of atoms from different ELEMENTS. All compounds are molecules, but not all molecules are compounds. Hydrogen gas (H2) is a molecule, but not a compound because it is made of only one element. Water (H2O) can be called a molecule or a compound because it is made of hydrogen (H) and oxygen (O) atoms. 

There are two main types of chemical bonds that hold atoms together: covalent and ionic/electrovalent bonds. Atoms that share electrons in a chemical bond have covalent bonds. An oxygen molecule (O2) is a good example of a molecule with a covalent bond. Ionic bonds occur when electrons are donated from one atom to another. Table salt (NaCl) is a common example of a compound with an ionic bond. 

You may also learn about a third type of bond. Metallic bonds occur between metal atoms. We’re going to focus on ionic and covalent bonds. 

PHYSICAL and Chemical Traits of Compounds

When we discuss phase changes in matter, we are looking at physicalchanges. Physical forces alone (unless you're inside of the Sun or something extreme) rarely break down compounds completely. You can apply heat to melt an ice cube, but there will be no change in the water molecules. You can also place a cup of water in a container and decrease the pressure. The water will eventually boil, but the molecules will not change. 

Chemical changes in compounds happen when chemical bonds are created or destroyed. Forces act on the bonds between atoms, changing the molecular structure of a substance. You can pour liquid acid on a solid and watch the solid dissolve. That process is a chemical change because molecular bonds are being created and destroyed. Geologists pour ACIDS on rocks to test for certain compounds. 

There are millions of different compounds around you. Probably everything you can see is one type of compound or another. When elements join and become compounds, they lose many of their individual traits. Sodium(Na) alone is very reactive. But when sodium and chlorine (Cl) combine, they form a non-reactive substance called sodium chloride (table salt, NaCl). New compounds have few or NONE of the physical or chemical traits of the original elements. They have a new life of their own. 

Different Bonds Abound

If you look at sodium chloride, it is held together by one ionic/electrovalent bond. What about magnesium chloride (MgCl2)? It contains one magnesium(Mg) and two chlorine (Cl) atoms. There are two ionic bonds. Methane (CH4) is made up of one carbon (C) and four hydrogen (H) atoms. There are four bonds and they are all covalent. 

Those examples have very simple chemical bonds. However, most compounds have combinations of ionic and covalent bonds.

Hydrocarbons which have same MOLECULAR FORMULA but DIFFERENT structural formula are called Isomers . For Example refer to ATTACHMENT

The MASS RATIO of PROTIUM:DEUTERIUM:TRITIUM is 1:2:3.

As the bronze metal is HARDER and more melleable than copper in nature the STATUES are mostly made ........ .as it also conducts PROPERTY of ductility it can be used for making a statue

8.39 GRAMS of HCL will reacts with 5G of magnese DIOXIDE

because PETROL and DIESEL are HARMFUL for ENVIRONMENT

An isotope with ATOMIC NUMBER 83, this is also DENOTED by the symbol Z, when it lies to the band of stability it will generally decay through nuclear fussion.

In radioactivity, nuclear fussion is the process through which smaller nuclei of atoms join to form HEAVIER ATOM.

Isotope with atomic number 83 is lighter hence decays through nuclear fussion to form a heavy nucleus atom.

Because It is EXTREMELY HIGH Exothermic.
if we use petrol it may cause BLAST

Hey MATE here's UR answer

Electrovalency : the no. of electrons lost or gained by an ATOM during the formation of an ionic bond is called a its electrovalency

Covalency : the no. of electrons lost or gained during the formation of a COVALENT bond is called it's covalency.

The answer is :

➡️ Option (d) FE IE iron.

The REASON is :

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.

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Fe is comparatively less reactive than other metals like ca, mg, na etc.

Therefore, it does not REACT with cold or hot water .

But it does react with steam.

Hope this HELPS you friend

In CHEMISTRY, finding the mass percentage of an element in a compound might sound COMPLICATED, but the calculation is simple. For EXAMPLE, to determine the mass percentage of hydrogen in water (H2O), DIVIDE the molar mass of hydrogen by the total molar mass of water and then multiply the result by 100

I not UNDERSTAND the QUESTION

It is the LAW of CONSERVATION of MASS..

Thomsen show that cathode RAY were composed of a previously unknown negatively charge particles , which was later NAMED that electron. cathode ray tubes use a FOCUSED bean of electron deflected by electric or magnetic field to creat e the images on TELEVISION screen.

It NAME is 3-hydroxy BUTANAL


HOPE it's HELPS

Here is your ans. by a IMAGE

MAKE me a branialist ALSO ...

Hope it's help U...

No You have to CHOOSE the longest CHAIN which is 6 carbon chain LOOK CAREFULLY

Mutagenesis /is a PROCESS by which the genetic information of an organism is changed, RESULTING in a mutation. It may occur SPONTANEOUSLY in nature, or as a RESULT of exposure to MUTAGENS. It can also be achieved experimentally using laboratory procedures. In nature mutagenesis can lead to cancer and various heritable diseases, but it is also a driving force of evolution. Mutagenesis as a science was developed based on work done by Hermann Muller, Charlotte Auerbach and J. M. Robson in the first half of the 20th century.[1

The presence of radiation in a GAS discharge is CALLED as CANAL ray.discovered byE.Goldstein

HEY MATE , HERE IS UR ANSWER...

A reagent containing an aqueous sodium hydroxide SOLUTION and benzenesulfonyl chloride is added to a substrate. In this test, the amine is shaken well with Hinsberg reagent in the presence of aqueous alkali (either KOH or NAOH).

PLS MARK MY ANSWER AS BRAINLIEST ANSWER

Chlorine is having ONE lone PAIR of electrons.

Hope it HELPS you.

the groups ferrocyanide have the charge -4, given from 6 ions CN− with charge -1 and a ATOM of iron with charge +2. Each [FE(Fe(CN)6)] is then a −1 , so with each [Fe(CN)6]4− being a 4− charge, the bolded iron is a +3

dear,hope this will help you

Boron is USED in insecticides and HERBICIDES. It is an ESSENTIAL trace ELEMENT. As boric ACID, it has antiseptic, antifungal, and antiviral properties.

The MOLECULES of air WATER and ACID REACTS on the layer of copper vessel and FORMS the layer of rusting on it

They are deflected in electric and magnetic field in OPPOSITE to that of cathode rays. The NATURE or e/m RATIO of anode raysdepend upon the nature of gas present in the cathode ray tube. They are( particles of anode rays ) simply positively CHARGED gaseous IONS.

An ionic compound is a giant structure of IONS. The ions have a REGULAR, repeating arrangement called an ionic lattice. The lattice is FORMED because the ions attract each other and form a regular PATTERN with oppositely CHARGED ions next to each other.

Sodium loses one electron to form Na+1. Aluminate is a polyatomic ION because it CONTAINS one aluminum atom and two oxygen ATOMS. This gives the WHOLE ion a -1 oxidation STATE. The formula for sodium aluminate is NaAlO2, which has no net charge.

At almost exactly the same time that chemists were developing the valence-bond model for coordination COMPLEXES, physicists such as Hans Bethe, John VAN Vleck, and Leslie Orgel were developing an alternative known as crystal field THEORY. This theory tried to describe the effect of the electrical field of NEIGHBORING IONS on the energies of the valence orbitals of an ion in a crystal. Crystal field theory was developed by considering two compounds: manganese(II) oxide, MnO, and copper(I) chloride, CuCl.

Diarrhoea is condition of passing three or more loose or LIQUID stools per day. It is caused due to an infection of bacteria,etc. It spread through contaminated (UNCLEAN or polluted) water and food, poor hygienic condition etc.. It is very common in India due to lack of proper hygiene and poverty.
It lead to loss of fuel from the body,i.e., dehydration, which may even prove fatal particularly in young children. Diarrhoea should not be neglected. The patient should be dehydrated by giving oral rehydration solution (ORS). ORS is mixture of clean water salt and sugar which can be easily prepared at home.
So I think option (b)- nacl.

KEY MEASURES TO PREVENT DIARRHOEA ARE:-
(1 ) Access to safe drinking water
(2) Improved sanitation
(3) Personal and food hygiene
(4) Education about how infections spread

HOPE IT'S HELP YOU .........
thanks for your reply.



KNOW ALSO--"ORT"
Oral rehydration therapy is a type of fluid replacement used as TREATMENT for dehydration. It involves drinking water mixed with sugar and salt while continuing to eat. When dehydration is serve, includes therapy supplement zinc also. SINCE its introduction and Development for widespread used in the later part of 12th century. 0rt has decrease human death from dehydration.