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PHYSICAL PROPERTIES of Hydrogen:

1) It is Odorless.

2) It is tasteless.

3) It is Colourless.

4) It is highly combustible.

5) It is non- metallic.

a) When hydrogen and air is exposed to candle flame then the hydrogen will burn, that is, it is combustible.

b) When hydrogen BURNS in the air, it reacts with oxygen present in atmosphere to form water molecule, that is, H2O.

Name four metals which react with caustic soda or caustic potash solution on boiling and liberate hydrogen gas. Suppport your answer by writing a fully balanced EQUATION for any ONE of the above named metals.

4. Name two metals which react with dilute sulphuric acid or dilute hydrochloric acid to liberate hydrogen gas. Support your answer by writing fully balanced equations of any one of the named metal with (a) dilute sulphuric acid

(B) dilute hydrochloric acid.

5. Briefly describe an experiment to prove that water CONTAINS two volumes of hydrogen and one

volume of oxygen.

6. (a) By DRAWING neat diagram explain how hydrogen gas is collected in laboratory.

(b) What is importance of copper sulphate solution in above

ANSWER:

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EXPLANATION:

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ANSWER:

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Answer:

A suspension is a heterogeneous mixture in which the solute particles do not dissolve, but GET suspended throughout the bulk of the SOLVENT, left FLOATING around freely in the medium. The internal phase (solid) is dispersed throughout the external phase (fluid) through mechanical agitation, with the USE of CERTAIN excipients or suspending agents.

Explanation:

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ANSWER:

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ANSWER:

potatstim PERMANENTE (KMO2

Explanation:

MOLE CONCEPT

Answer:

All matter is MADE of atoms. Atoms are indivisible and indestructible. All atoms of a GIVEN element are IDENTICAL in mass and properties. Compounds are formed by a combination of two or more different KINDS of atoms.

Explanation:

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If you wanna FIND pH (PARTICLES of h in a COMPOUND or an element use this)

pH = -logX (H+)

Where X is The Compound or element of which you want to find The pH

Example - H2O

All you have to do is

(H)2 • O
And now molecule’s of That or The Weight Of Compound

If Oxygen is 1 gram then the pH will Be

PH (O) = log1
pH(O) = INFINITE / UnDefined

Well scientifically the answer will be infinite which is the absolute value of Log1

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ANSWER:

an element whose properties are INTERMEDIATE between those of METALS and SOLID non-metals or semiconductors.

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You have to brominate Phenol in carbon DISULFIDE to obtain 4-Bromophenol. At -30° C, 4-bromophenol is yielded by 97% and at +30° C, the yield is 82%. You will need a 5 litre flask fitted with a mechanical stirrer, a reflux condensor and a separatory funnel. To the top of the tunnel, a calcium chloride tube is attached and from this, a glass tube LEADING into a beaker holding about 1200ml of cracked ice and water for the absorption of hydrobromic acide evolves. In a separatory funnel approximately 546 ml of bromine which is dissolved in equal volume of carbon disulfide is placed. The flask is cooled in salt and ice mixture while the stirring starts and bormine solution starts to run in. This takes approximately 2 hours. Post 2 hours, the flask is detached and a condensor is attached in downward distillation. The flask is then heated and the carbon disulfide is distilled of. The carbon disulfide collects as much as 1200ml. The residual liquid is then vaccum distilled yiekding 1660gs of p-bromophenol boiling 145-150/25-30mm and 136 GMS of lower boiling material consisting of a mixture of o- and p-bromophenol. The reaction mixture should be cooled with salt and ice, when making 4-bromophenol. 25gms of 1,4 dioxane dibromide is gradually ADDED to 9.4 gms of phenol with water cooling. Then the mixture is poured with water and extracted with ether. The ether is DRIED with sodium sulfate, filtered and evaporated yielding 88% of 4-bromophenol.

Answer:

the quality or state of being malleable: such as. a : CAPABILITY of being shaped or extended by HAMMERING, FORGING, etc. the malleability of TIN.

ANSWER:

a GASEOUS pollutant

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Answer:

2-ethyl 4,4-dimethyl pentan-1-ol

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Answer:

Such a bond forms when the valence (outermost) electrons of one atom are transferred PERMANENTLY to another atom. The atom that loses the electrons BECOMES a positively CHARGED ion (cation), while the one that gains them becomes a negatively charged ion (anion). A BRIEF TREATMENT of ionic bonds follows.

Explanation:

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the ANSWERS is BASIC......

Answer:

U is unified ATOMIC mass unit(amu) g on the other side is molecular mass EXPRESSED in GRAMS therefore you have 24U and 24 g

ANSWER:

CYANOCOBALAMIN will be the ANS

Answer:

Take FIRST 20 elements from HYDROGEN to calcium and make a model. Subatomic PARTICLES mean number of protons, electrons and neutrons. Valency of metals is same as of BALANCE electrons. For non metals subtract VALENCE electrons from 8.

<STRONG>ANSWER:

HCl is a strong ACID, it dissociates 100% (I.e. completely)

pH of 0.02M HCL is 2

pOH of 0.02M HCL is 1.70

ANSWER:

Ethanol is an important industrial CHEMICAL; it is used as a solvent, in the synthesis of other organic CHEMICALS, and as an additive to AUTOMOTIVE gasoline

ANSWER:

It is not RADICAL. It is a neutral salt because it is salt of strong Acid and strong BASE. Ca2+ is basic radical and NO3– is acid radical.

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ANSWER:

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EXPLANATION:

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An electroscope is an EARLY SCIENTIFIC instrument used to detect the presence of electric charge on a BODY. It detects charge by the movement of a test object DUE to the Coulomb electrostatic force on it. The amount of charge on an object is proportional to its voltage. 

ANSWER:

BASIC RADICAL : Na+

Acidic Radical : CL-

ANSWER:

Element = A   (valency = 2)

Chlorine = Cl  (valency = 1)

Metal CHLORIDE = A Cl₂

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Answer:

GRAPHITE is a form of CARBON which is an element. ... Graphite is a non-metal and it is the only non-metal that can conduct electricity. You can find non-metals on the right SIDE of the periodic table and graphite is the only non-metal that is a good CONDUCTOR of electricity.

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Answer:

1. energy of PHOTON having WAVELENGTH 10 nm is 1.77ev

ANSWER:

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Explanation:

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Answer:

IONIC BOND, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (OUTERMOST) electrons of ONE atom are transferred permanently to another atom.

Answer:

Cesium (Ce) and Gallium (GA)

Explanation:

Cesium (Ce) and Gallium (Ga) are 2 metals that become liquids at a TEMPERATURE slightly above room temperature. There are other metals too like RUBIDIUM (Rb) and FRANCIUM (Fr) that become liquids at a temperature slightly above room temperature.

The REACTIVITY series of METALS, ALSO known as the activity series, refers to the arrangement of metals in the descending order of their REACTIVITIES

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Answer:

Natural Radioactivity

The phenomenon of spontaneous and continuous and uncontrollable disintegration of an unstable nucleus accompanied by the EMISSION of active radiations is called natural radioactivity. The substance which exhibits radioactivity is called a radioactive substance. e.g. Uranium, THORIUM, radium, etc.

Artificial Radioactivity

Artificially radioactive ISOTOPES can be USED in the treatment of disease as WELL as in its diagnosis. For example, an artificially radioactive isotope of cobalt is used to treat some types of cancer patients. The radiation from the cobalt damages cancerous cells and may prevent the spread of the disease

ANSWER:

HYDROGEN PEROXIDE this is a LINK below.

METAL:

1. Corrosion resistance.
2. Density.
3. Melting point.
4. THERMAL properties.
5. Electrical conductivity.
6. Magnetic properties.

Non Metal:

1. High ionization energies.
2. High electronegativities.
3. Poor thermal conductors.
4. Poor electrical conductors.
5. Brittle solids—not MALLEABLE or ductile.
6. Little or no METALLIC luster.

Answer:

Comparison Of Physical Properties Of Metals And Non-metals

Property Type Metals Non-metals

LUSTRE Shining lustre They have no lustre except for iodine.

SONOROUS sound Sonorous. Non-sonorous.

Hardness GENERALLY hard exception being Na, K Generally soft except diamond

Explanation:

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Explanation:

This REACTION is both precipitation reaction as WELL as double displacement reaction.

In a double displacement reaction the ANIONS are exchanged and in a precipitation reaction, a PRECIPITATE is formed in the end. In this case, AgCl is the precipitate.

ANSWER:

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Answer:

EQUIVALENT CONDUCTANCE = K(kappa)×1000/N

= 0.002765×1000/(1/50)

= 2.765×50 MHO cm^2 /gequivalent

An element is a substance that cannot be BROKEN down into any other substance. There are about 100 elements, each with its own type of atom. Everything in the UNIVERSE contains the atoms of at LEAST one or more elements. The periodic table lists all the known elements, grouping together those with similar PROPERTIES.

ANSWER:

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ANSWER:

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Answer:

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Explanation:

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ANSWER:

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ANSWER:

U didn't GIVE the TEMPERATURE

ANSWER:

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ANSWER:

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Explanation:

Formal Charge:-

Formal charge (FC) is the charge ASSIGNED to an atom in a molecule, assuming that electrons in all chemical bonds are SHARED equally between atoms, regardless of relative electronegativity.[1] When determining the best Lewis structure (or predominant resonance structure) for a molecule, the structure is chosen such that the formal charge on each of the atoms is as close to zero as possible.

credits: Wikipedia

Formula for formal charge:-

FC= V-N- (B/2)

where,

V is the number of valence electrons of the neutral atom in isolation (in its ground state);

N is the number of non-bonding valence electrons on this atom in the molecule;

B is the total number of electrons shared in bonds with other atoms in the molecule.

1) Here,

Hydrogen has 1 valence electron always and it has no election left to be shared and it is sharing 2 electrons with C ( single bond) so the values to be put in formula for hydrogen become 1-0-(2/2) =0

Similarly for C

the valence electrons for carbon are always 4

in the given formula we can see that there is no electron left for sharing and it is sharing 8 electrons 6 with N ( 3 bonds) and 1 with H ( single bond) hence the values in the formula become 4-0-(6/2)=0

Same goes for N

5 valence electrons

1 lone pair so 2 electrons

6 shared electrons (3 bonds with C)

so, 5-2-(6/2)=0

2) Now here the position for N and C are interchanged, which makes it interesting.

The CASE with H will remain the same as it is still having single bond and it is able to achieve its stable state without any problem, no matter where it gets its electron from.

But for N, whose TENDENCY is to gain electrons, is now having 4 binds, one with H and 3 with C

so, it has exhausted it's lone pair of electrons.

The valence electrons of N is 5 the free electrons of N now is 0 and the shared electrons of N is 8 ( 4 bonds)

so the formal charge is 5-0-(8/2)=+1

Now for C, here as usual its valence electrons will be 4, but now it will have one lone pair of electrons as it has formed on 3 bonds as opposed to the usual bonding of 4. Also, because it has formed three binds, therefore, its shared electrons will be six.

hence, its formal charge will be 4-2-(6/2)=-1

Now, what is important to note here is that N usually does not have +ve charge but here it has it and same goes for C, it does not have negative charge but here it has it.

So, keep in mind that Formal Charge is NOT REAL CHARGE, IT IS FAKE CHARGE.

3. In this Ozone formula also, you will see that one of the oxygen atoms will have +1 other will have -1 and third will have 0 formal charge.

The formal charge appears to keep the molecule stable.

Hope this helps!

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ANSWER:

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Answer:

1) 2-methyl propane

2) 2,3-dimethyl butane

3) 1-methyl butane

4) 2,2-dimethyl propane

5) 2,4-dimethyl pentane

6) Pent-1-ene

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