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Answer:

John Dalton

Explanation:

was an ENGLISH chemist, physicist, and meteorologist. He is BEST known for INTRODUCING the atomic theory into chemistry, and for his research into colour blindness, sometimes referred to as Daltonism in his HONOR.

Answer:

water

Explanation:

water when freezed it is in solid which we called ice.again if we heat it then the LIQUID form of water we will GET. then we heat this ,then after sometime it STARTS EVAPORATING

ANSWER:

JOHN DALTON is your answer

Answer:

The vast majority of explosives are chemical explosives. Explosives usually have less POTENTIAL energy than FUELS, but their high rate of energy release produces a great blast pressure. TNT has a detonation velocity of 6,940 m/s compared to 1,680 m/s for the detonation of a pentane-air mixture, and the 0.34-m/s stoichiometric flame speed of gasoline combustion in air.

The vast majority of explosives are chemical explosives. Explosives usually have less potential energy than fuels, but their high rate of energy release produces a great blast pressure. TNT has a detonation velocity of 6,940 m/s compared to 1,680 m/s for the detonation of a pentane-air mixture, and the 0.34-m/s stoichiometric flame speed of gasoline combustion in air.The PROPERTIES of the explosive indicate the class into which it FALLS. In some cases explosives can be made to fall into either class by the conditions under which they are initiated. In sufficiently large quantities, almost all low explosives can undergo a Deflagration to Detonation TRANSITION (DDT). For convenience, low and high explosives may be differentiated by the shipping and storage classes.....☺

Explanation:

Question:

calculate volume of CO obtained At stp by combustion 18g of c (c-12)

ANSWER:

Volume = 2.24litres

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SO2= 32+(16*2)

. =32+32

. =94

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ANSWER:

Otherwise it will explode

Explanation:

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EXPLANATION:

like gold , platinum, SILVER, etc are the examples of NOBLE metals . These are called noble metals because they are a group of metals that RESIST oxidation and corrosion in moist air & they are not easily attacked by acids .

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Answer:

Explanation:

FREEZING is the process of changing a LIQUID into a solid by cooling whereas melting is the process of changing a solid into a liquid by heating. HENCE it can be said that. Melting is the opposite change, from a solid to a liquid as the temperature increases. ... Freezing is a change from a high energy state to one of lower energy, the molecules are moving LESS as their temperature falls.t freezing is the REVERSE of melting

ACRYLIC FIBRE

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lint, or linter is a tool that analyzes sources code to FLAG programming errors bugs, STYLISTIC errors, and suspicious CONSTRUCTS, the Wikipedia artical then goes on to say that the TERM linter comes from a tool that analyzed C source code, the computer scientist Stephen C.

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Answer:

An example of material is the fabric from which something is MADE. An example of material are the facts used in a book. An example of material are the jokes a COMEDIAN tells. An example of material is the WOOD used to build something.

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ANSWER:

there is no SPACE between KEROSINE molecules

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ANSWER:

METAL SALT and HYDROGEN GAS

ANSWER:

CANT UNDERSTAND the QUESTION

ANSWER:

>> (d) is UR ANS...............!!

Answer:

Non-metals do not react with acids. This is due to the FACT that a substance undergoing reaction with acids, donates electrons to the H+ ions PRODUCED by the acids. But non-metals are acceptor of electrons and hence they do not donate electron to the hydrogen ion of the acid.

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The CORRECT ANSWER is FLOOD

Answer:

The composition of a sample of steel is : 98% iron, 1.5% carbon and 0.5% other elements. (b) Zinc dissolves in hydrochloric acid with the EVOLUTION of hydrogen gas. (C) Metallic sodium is soft ENOUGH to be CUT with a KNIFE. (d) Most metal oxides form alkalis on interacting with water.

Explanation:

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Answer:

CORNFLAKES in milk

Oil in WATER

EXPLANATION:these all can be SEPARATED by filtration

Answer:

a PHYSICAL CHANGE

b chemical change

c physical change

d chemical change

The HYDRIDE ION is formula is .

Answer:

5min = 300

13min= 780

512min= 30720

Explanation:

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The Early Stone Age began with the most basic stone implements made by early humans. These Oldowan toolkits INCLUDE hammerstones, stone CORES, and sharp stone FLAKES. By about 1.76 million YEARS ago, early humans began to make Acheulean handaxes and other large cutting TOOLS.

ANSWER:

The molecules of the air move further apart occupying more space than before. ... The balloon CONTRACTS when placed in the bowl CONTAINING cold water and ice because the temperature within the bottle reduces causing the air in it to COOL down.

Explanation:

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Answer:

Since 100 GRAMS of sodium has more MOLES, it contains more ATOMS than 100 grams of iron. As we know , the one - MOLE atoms contains 6.022 multiply 10 ^23 atoms . so , more the number of moles , more the number of atoms . and hence 100 G pf Na atoms has a greater number of atoms than 100 g Fe .

Explanation:

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ANSWER:

H2O

Slaked LIME

Quick lime

BAKING soda

Explanation:

R u sure that (i) and (ii) are the correct options ?? Becuz I'm GETTING the answer as 0.2 moles per litre
Sol. m= wt/GMM * 1/ Vol(in lts)
=> m = 5.85 / 58.5 * 1000/ 500
=> m = 0.1 * 2
=> m = 0.2 mol / lt

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Isoelectronic Definition.Isoelectronicrefers to two ATOMS,ions or molecules that have the same electronic structureand same number of valence electrons. The TERM means "equal electric" or "equal charge". ... There are many ions that are isoelectronic. Forexample: Isoelectronic ions. number of electrons.

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Boyel law STATES that at a given temperature, the VOLUME occupied by a fixed mass OH s had is inversly PROPORTIONAL to its PRESSURE PV=constant=k

Given

Co2

So in this we have 1 mole of carbon and 2 moles of oxygen

Mass of one mole of carbon = 12

Mass of one mole of oxygen =16

Total mass =12+(16x2)

=12+32

=44G

1 mole of Co2 having 44g mass

Now we are having 22g

So

Dividing it with 2

Then we get half mole of carbon and 1 mole of oxygen

22g=1/2 mole of carbon + 1 mole of oxygen

1 mole of oxygen CONTAINS 6.023 x10²³ atoms of oxygen.

Therefore 22g of Co2 contains 6.023x10²³ atoms of oxygen

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Given

AlCl3

Molar MASS =Al+Cl3

=27+(35X3)

=27+105

=132g

(Given quantity =66.7g)

=66.7/132

=0.5053g

Now TAKE the amount of moles and multiply it by Avogadro's constant, which is 6.023 x 10^23

=0.5053x6.023x10²³

=3.043 x 10²³

This is for 1 ATOM of CL

and in ALCL3 we have 3 atoms


So for three

=3.043x10²³x3

=9.13x10²³

Number of chloride ions=9.13x10²³

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First you NEED to find relative molecular mass. You can calculate it USING relative atomic mass of C and O So

MCO2=12+16×2

=44gmol−1

molecular mass of CO2 is 44. Which mean 44 grams of CO2contain Avogadro’s number of ATOMS. So,

44gmol−1=6.022×1023mol−1(Avogadro’s number)

442=6.022×10232

22G=3.011×1023

So 22g of CO2have 3.011×1023 CO2molecules.

Since ONE molecule has one carbon atom it also has 3.011×1023 Carbon atoms

Aniline when treated with ACETOACETATE will PRODUCE Nacetyl aniline. This if treated with H2SO4/HNO2/CH3COOH will produce paranito nacetyl aniline, which on hydrolysis will GIVE para nito aniline. a bit of ortho form will also form but it will be very LITTLE and can be easily separated by distillation.
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In the MODERN PERIODIC Table, the elements are arranged in the ORDER of their INCREASING Atomic number.

The modern periodic table contains 18 vertical columns which are called groups and 7 horizontal rows that are called periods.

The first vertical column or group contain Alkali metals.

The second group contains Alkaline earth metals

The first and the second groups together constitute the S-block.

After that, comes the D-block which contains 10 groups from IB to VIIIB,

the group VIIIB itself is a COLLECTION of 3 groups.

The F-block elements are present below the D-b;ock.

After it, the P-block elements come which constitute 6 groups from IIIA to VIIIA.

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The OPTION B Is the RIGHT ANSWER

Illustration : Find out the longest wavelength of absorption line for hydrogen GAS containing atoms in ground STATE.



Exercise 2: (i) The series limit for the Paschen series of hydrogen spectrum occurs at 8205.8 A° . Calculate.

(a) Ionization energy of hydrogen atom

(b) Wave length of the photon that would remove the electron in the ground state of the hydrogen atom.

(ii) Calculate frequency of the spectral line when an electron from 5th Bohr orbit jumps to the second Bohr orbit in a hydrogen atom.

(iii) Calculate the energy of an electron in 3rd Bohr orbit.

Illustration : Calculate the energy in kJ PER mole of electronic charge ACCELERATED by a potential of 1 volt.


Exercise 5: (i) What is highest frequency photon that can be emitted from hydrogen atom? What is wavelength of this photon?

(ii) Calculate the longest wavelength transition in the Paschenseries of He+

(iii) Calculate the ratio of the wavelength of first and the ultimate line of BALMER series of Li2+ ?

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The Pauli exclusion principle is the QUANTUM mechanical principle which states that two or more identical fermions (particles with half-integer spin) cannot occupy the same quantum state within a quantum system simultaneously. In the case of ELECTRONS in atoms, it can be stated as follows: it is impossible for two electrons of a poly-electron atom to have the same values of the four quantum numbers: n, the principal quantum number, ℓ, the angular momentum quantum number, mℓ, the magnetic quantum number, and ms, the spin quantum number. For example, if two electrons reside in the same orbital, and if their n, ℓ, and mℓ values are the same, then their ms must be different, and THUS the electrons must have opposite half-integer spin projections of 1/2 and −1/2. This principle was formulated by AUSTRIAN physicist Wolfgang Pauli in 1925 for electrons, and later extended to all fermions with his spin–statistics theorem of 1940.

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Hey MATE, here is your answer :

Aluminium - AL 3+
Sulphate - SO4 2-

So, it will be Al2(SO4)3.

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@sidhartha

Yes chloroform and acetone ABSORB OXYGEN from AIR.

HI Rahul,

The formula of heavy water is D2O
(DEUTERIUM OXIDE)

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Plowing makes the SOIL porus which helps the seeds to easily germinate and spread roots deep which in turn helps the PLANT to absorb required nutrients and moisture from the DEEPER PARTS of the soil. It also provides NECESSARY aretaion for the plant roots.

POTASSIUM chloride is the SALT . Simply because by adding WATER it MIXES and on heating water evaporate out leaving the salt potassium chloride

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ENERGY is required to change water from a solid to a liquid, i.e. to melt ice. In thisexperiment you will try to measure the latent heat of fusion of ice (LHice), the energy NEEDED (per gram) to melt ice. The needed energy will come from a CUP of WARM water.

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Answer:

yes it's true

Explanation:

as GASES have more intercellular SPACE than SOLID and liquid and it's intermolecular force is very weak which HELP to move freely