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Answer:

NITROGEN Di oxide is LIBERATES when DILUTE nitrite acid reacts with COPPER metal

Answer:

Explanation:

The value of Kw at 25°C is 1 x 10-14. SINCE pure water is neutral in nature, H+ ION concentration MUST be equal to OH- ion concentration. This shows that at 25°C, in 1 litre only 10-7 mole of water is in ionic form out of a total of approximately 55.5 moles.

ANSWER:

When water freezes it gives up some of water's energy to environment. This released energy is heat TRANSFER. Now at 1atm PRESSURE during freezing of n MOLE of water

Heat transfer= nΔH

fusion

where ΔH

fusion

= ENTHALPY of fusion

Answer:

25. C

BECOUSE d - orbital PRESENT only in phosphorus

it can form dpie bond

EXPLANATION:

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an isolated and neutral ATOM is an unbonded, single atom in GASEOUS STATE

ANSWER:

OPTION2 ..................

Answer:

4.65 MOLES

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Explanation:

ANSWER:

the purpose of usinghofmann voltameter for the electrolysis of dilute sulphuric is the INCREASING of POPULATION

Answer:

14 c HOH in WATER 15 has answer b

Explanation:

14 the ANGLE between hoh is LEAST that is 104.5°

ANSWER:

The Condition required for the formation of an ionic bond between two Elements are:

The two elements must be of opposite charge, ONE negatively charged (ANION) and the other positively charge (cation).

One of these elements must have HIGH negative electron gain enthalpy(Anion).

ANSWER:

Its charge is 0.

Explanation:

CO is a neutral ion .a  ligan ion or molecule that BINDS to a central metal ATOM to form a coordination COMPLEX

ANSWER:

because their VALENCE shells have the capability of GAINING electrones THUS they are mostly electronegative

ANSWER:-287.5 kj/mol

Explanation:

Explanation:

1) Burning of candle is physical change because the candle changes its states. It transform from solid to liquid and then liquid to gaseous.

Burning of candle is chemical change because when we light up the candle through oxygen it CONVERT into carbon dioxide and water.

So, burning of candle is both physical and chemical change.

2) Graphite is used in the leads of pencils because the carbon ATOMS makes the pencil smooth to WRITE in paper.

3) Lime water contains calcium hydroxide Ca(OH)2. When calcium hydroxide REACTS with carbon dioxide(CO2) it produces calcium carbonate(CaCO3) and water(H2O). The calcium carbonate makes the water milky.

4) Oxygen is collected by the downward displacement of water because it is only slightly soluble in water and is less dense than water.

5) The particles of any gas are widely spread and can move freely in any direction .

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ANSWER:

I THINK so it's 1) 4.60 × 10^-8 CM

A process that involves REARRANGEMENT of the molecular or IONIC structure of a substance as distinct from change in PHYSICAL from or NUCLEAR REACTION.

ANSWER:

covalent character directly proportional to zeff and polarisation.

in PERIOD on MOVING TOP to bottom Zeff decreases.

Explanation:

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Answer:

Glass is sometimes called a supercooled liquid because it does not FORM a CRYSTALLINE structure, but instead forms an amorphous SOLID that allows molecules in the material to continue to move.

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The MINERALS from which PROFITABLE metals can be obtained are called ores .

E.g :- Cinnaber ( Ore of MERCURY )

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Shreya ❤

ANSWER:

B- halogen

c halogen

d. ketone

e. ALCOHOL

An atom or a group of ATOMS which when present in a COMPOUND GIVES specific properties to it is CALLED a FUNCTIONAL group .

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Answer:

The anion is the ONE which is negatively charged, hence O is the anion.

Explanation:

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ANSWER:

are U a boy or a GIRL. if a boy then go to hell

It's. simple

Explanation:

FIRST. CHECK. the. ELEMENT. and. how. many. atoms. are. their. on. each. SIDE

ANSWER:

To obtain a PURE SUBSTANCE...

Explanation:

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ANSWER:

I don't KNOW CHEMISTRY BRO SORRY

ANSWER:

2 OXIDATION STATE is CORRECT answer

Answer:

HALOALKANES and HALOARENES are the hydrocarbons in which one or more hydrogen atoms have been replaced with halogen atoms. The PRIMARY difference between haloalkanes and haloarenes is that haloalkanes are DERIVED from open-chain hydrocarbons (alkanes) WHEREAS haloarenes are derived from aromatic hydrocarbons.

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EXPLANATION:

a) 3,5-Dimethyl HEPTANE

B) pent-1-ene-4-yne

ANSWER:

HEY ..

There will be TWO moles of ions produced

EXPLANATION:

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ANSWER:

12 is correct answer........

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okkk...........

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EXPLANATION:

The sugar get dissolved in water.The sugar turns into small molecules.When sugar GETS dissolved in water,the particles of sugar gets in between the spaces of particles in water and fills the space.The water contains LARGE molecular spaces and the sugar gets crystallized.The NATURE of matter will be liquid or will REMAIN the same.

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Answer:

HLO mate...... KINDLY post the QUESTIONS.

Answer:

MAGNESIUM from its salts like Magnesium CHLORIDE (MgCl₂) is extracted by electrolytic reduction.

Cathode: Mg²+ + 2e-→Mg..(reduction)

ANODE: 2Cl- →Cl₂+ 2e-........(OXIDATION)

MgCl₂→(ELECTRICITY)→Mg+Cl₂↑

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ANSWER :-}

the FOLLOWING compound are homoalicylic compounds.

Answer:

Availability of raw material.

Availability of skilled and unskilled labour at low costs.

Local government POLICIES should be in their favour.

Availability of other factors of production should be ensured.

For instance, according to UNESCO (2010), non-formal EDUCATION helps to ensure equal access to education, eradicates or minimizes illiteracy AMONG women and improve women's access to vocational training, science, technology and continuing education.

EXPLANATION:

ALTITUDE or height is defined based on the context in which it is used. As a general definition, altitude is a distance measurement, usually in the VERTICAL or "up" direction, between a reference DATUM and a point or object. The reference datum also often varies according to the context. WIKIPEDIA

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RANITIDINE are USED to CONTROL hyperacidity.

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ANSWER:

DELTA NG = -2

Explanation:

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Answer:

Explanation:

CHEMISTRY

The FIRST ionization enthalpy (Δ

t

​

H) values of the THIRD period elements, Na, Mg and Si are respectively 496, 737 and 786 kJ mol

−1

. Predict whether the first Δ

t

​

H value for AL will be more CLOSE to 575 or 760 kJ mol

- 1

? Justify your answer.

December 27, 2019avatar

Anushka Monika

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ANSWER

The electronic configuration are as follows;

1

​

1Na(3s)

1

,

1

​

2Mg(3s)

2

,

1

​

3Al(3s)

2

(3p)

1

,

1

​

4Si(3s)

2

(3p)

2

The ionisation energy of Mg will be larger than that of Na due to fully filled configuration (3s)

2

The ionization of Al will be smaller than that of Mg due to one electron extra than stable configuration but smaller than Si due to increase in effective nuclear charge of Si.

$$NaAl

So, the first Δ

t

​

H value of Al will be more close to 575 Kj/mol. The value for Al should be lower than that of Mg because of effective shielding of 3p electron from the nucleus by 3s electron

Answer:

the VALENCE electrons are present in the OUTERMOST shell of an electron PLEASE MARK

Answer:

An EXCHANGE REACTION occurs between compounds that, when written as a molecular equation, APPEAR to involve the exchange of parts between the two reactants. An exchange reaction will occur when ions in SOLUTION form insoluble products, WEAK electrolytes, or nonelectrolytes.

Answer:

Desalination means any process that REMOVES the excess salt and other minerals from water in order to obtain fresh water suitable for animal CONSUMPTION or IRRIGATION. Most desalination is by distillation. Some is by reverse osmosis or other methods. The MAIN purpose is to make water for PEOPLE to use.

1 FLUORINE

2 chlorine

3 bromine

4 IODINE

Answer:

the atomic mass of chlorine (CL) is 35.45 amu because chlorine is composed of SEVERAL isotopes, some (the majority) with an atomic mass of 35 amu (17 protons and 18 neutrons) and some with an atomic mass of 37 amu (17 protons and 20 neutrons).

It is a BRANCH of science and technology which deals with the extraction and purification of METALS from their ores.

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ANSWER:

physical property of co2 are

odourless

colourless

chemical property

burning candle GETS diffused

acidic in nature

Ca(oh)2 + CO2=CaCO3

in aq form TURNS blue litmus RED..

ANSWER:

PHYSICAL CHANGE is TEMPORARY or REVERSIBLE.......