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ong>Answer:

17. NUMBER of groups and periods In MODERN periodic table is ____and ___

(A) 16, 7 (B) 6, 16 (C) 18, 7 (D) 18, 6

ong>Answer:

The element with the atomic number 12 is magnesium. The atomic number indicates the number of positively charged PROTONS in each magnesium NUCLEUS. A NEUTRAL atom has equal numbers of protons as negatively charged ELECTRONS. The electron configuration of a neutral magnesium atom is: 1s^2 2s^2 2p^6 3s^2

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1-: DRY ice.

2-: Solid carbon dioxide.

3-: Naphthalene ball.

4-: Ammonium chloride.

5-: CAMPHOR.

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ong>Answer:

As a CONSEQUENCE, atoms of the same isotope will have the same ATOMIC ... 2H, or deuterium ( D), is the other STABLE isotope of hydrogen.

Hepta 1,2,3 Tri-ene

Explanation:

ong>Answer:

this is the LEWIS DOT DIAGRAM for the OZONE

EXPLANATION:

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ong>Answer:

A charge TRANSFER complex also CALLED as the electron donor acceptor complex can be defined as an ASSOCIATION of ... Charge transfer can also take place through the process of induction.

ong>ANSWER:

The ATOMIC number or proton number (symbol Z) of a chemical ELEMENT is the number of protons found in the NUCLEUS of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus

Explanation:

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ong>Answer:

1.The equilibrium constant KC for the reaction of hydrogen with IODINE is 54.0 at 700 K.

#H2(G) + 12(g) = 2 HI(g)

#Kc= 54.0 at 700 K

a. If kf is the rate constant for the formation of HI and kr is the rate constant for the decomposition of

HI, deduce WHETHER kf is larger or smaller than kr.

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ong>Answer:

Applications of Electrochemical Series. (i) Reactivity of metals: The activity of the metal depends on its TENDENCY to lose electron or electrons, i.e., tendency to FORM cation . ... (a) Alkali metals and alkaline EARTH metals having high negative values of standard REDUCTION potentials are CHEMICALLY active.

ic mass of:

K = 39 U

Mn = 55 u

O = 16 u

Now, KMnO4 = 39 u + 55 u + 4(16 u)

= 39 u + 55 u + 64 u

= 158 u.

∴ The formula unit mass of KMnO4 is 158 u.

More:

What is the difference between MOLECULAR mass and formula unit mass?

The basic thing is that we use the TERM 'formula unit mass' only when the molecules are formed by ions.

Na2

Explanation:

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ong>Answer:

soniaku kiran kumar REDDI samicandhra TANA

ong>Maie APANA 1000 answer pura pura kar raha HO.

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B NARENDRA Modi

Explanation:

Electromagnetic radiation, in CLASSICAL physics, the flow of energy at the UNIVERSAL SPEED of light through free space or through a material medium in the form of the electric and magnetic fields that make up electromagnetic waves such as radio waves, visible light, and GAMMA rays.

n't KNOW HINDI H EY HYBRID

ong>Answer:

1. BLACK residue left.
2. reddish brown fumes
3. alkaline PYROGALLOL solution
4. 2Cu(NO3)2(s) → 2CuO(s) + 4NO2(G) + O2(g).

ong>ANSWER:

colostomy detection sensitivity foldable states that there is inherent uncertainty in the active measuring the variable of a particle COMMONLY applied to the position and momentum of a particle the principle states that the more precisely the position is known the more UNCERTAIN the momentum is and vice versa

ELEMENTS of 1ST PERIOD belong to S block

Explanation:

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ong>Explanation:

During a chemical reaction, the substances that react are known as reactants whereas the substances that are formed during a chemical reaction are known as products. Six common TYPES of chemical reactions are discussed below.

Types of Chemical Reactions Explanation General Reaction

Combination reaction Two or more COMPOUNDS COMBINE to form one compound. A + B → AB

Decomposition reaction The opposite of a combination reaction – a complex molecule breaks down to make simpler ones. AB → A + B

Precipitation reaction Two solutions of soluble salts are mixed resulting in an insoluble solid (precipitate) forming. A + Soluble salt B → Precipitate + soluble salt C

Neutralization reaction An acid and a base react with each other. Generally, the product of this reaction is a salt and WATER. Acid + Base → Salt + Water

Combustion reaction Oxygen combines with a compound to form carbon dioxide and water. These reactions are exothermic, meaning they give off heat. A + O2 → H2O +

236 and 240 RESPECTIVELY

ong>Answer:

1. ATOMIC MASS of CL2 is 35.5*2= 71

formula mass of CaCl2 is 40+71=111g

2. formula mass of KMnO4=158.034g

ong>Answer:

B) CARBONATE

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Fundamental Subatomic Particles

1. The number of protons in the nucleus of the atom is equal to the ATOMIC number (Z).
2. The number of ELECTRONS in a neutral atom is equal to the number of protons.
3. The mass number of the atom (M) is equal to the SUM of the number of protons and neutrons in the nucleus.

(c) A is true but R is false.

Explanation:

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ong>ANSWER:

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To FIND the number of moles of Zn, we divide the GIVEN amount of Zn by the molar mass of Zn. HENCE, 1.34 g of Zn contains 0.020 moles of ZINC.

rong>Answer:

To calculate molar MASS of a chemical compound enter its formula and click 'Compute'. In chemical formula you may use:Any chemical element. Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al.Functional groups: D, Ph, Me, Et, Bu, AcAc, For, Ts, Tos, Bz, TMS, tBu, BZL, Bn, Dmgparantesis () or BRACKETS [].Common compound names.Examples of molar mass computations: NaCl, Ca(OH)2, K4[Fe(CN)6], CuSO4*5H2O, water, nitric acid, potassium permanganate, ethanol, fructose.

Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to NUMBER of moles and vice versa.

ong>Answer:

I can't UNDERSTAND this question

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Explanation:

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ong>EXPLANATION:

MOLECULAR MASS of Na2O

= 2 × ATOMIC mass of Na (sodium) + 1 × atomic mass of O (Oxygen)

= 2 × 23 + 1 × 16

= 46 + 16

= 62u

Molecular mass of NH3

= 1 × atomic mass of N (Nitrogen)+ 3 × atomic mass of H (Hydrogen)

= 1 × 14 + 3 × 1

= 14 + 3

= 17u

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ong>Answer:

MAINTAIN your questions in a sequence to understand. FIRST

ong>Answer:

The Atomic number of magnesium is 12. Then its electron DISTRIBUTION is 2,8,2.

K, L and M shells have 2, 8, 2 electrons RESPECTIVELY. K and L shells can accommodate a MAXIMUM of 2 and 8 electrons respectively. The VALENCE shell has 2 electrons.

ong>Answer:

Explanation:

Answer:

Answer:

Answer:

Answer:

Width of rectangle is 25 cm.

Step-by-step explanation:

Given :-

A WIRE bend in form of square of side 30 cm.

Then wire is again bend in form of rectangle of LENGTH 35 cm.

To find :-

Width of the rectangle.

Solution :-

Here, Concept is : If we are bending wire in form of square than again bending it in rectangle. Than, PERIMETER of square will equal to perimeter of rectangle because we are not increasing length of wire by one measure we are bending it in square and rectangular shape.

So,

Perimeter of square = 4 × side

⟶ Perimeter = 4 × 30

⟶ Perimeter = 120

Thus,

Perimeter of square is 120 cm.

According to concept, Perimeter of square and perimeter of rectangle are equal.

So, Perimeter of rectangle is 120 cm.

Let, Breadth or width or rectangle be X cm.

We know,

Perimeter of rectangle = 2(Length + Breadth)

⟶ 120 = 2×(35 + x)

⟶ 120 = 70 + 2x

\⟶ 120 - 70 = 2x

⟶ 50 = 2x

⟶ 50/2 = x

⟶ x = 25

We take, Width of rectangle be x.

Therefore,

Width of rectangle is 25 cm.

ong>Answer:

When Alkali metals are heated in excess air BASIC nature of oxides are formed.

The reducing nature is determined by the tendency of losing electron. Since this tendency is lower in alkaline earth metal than alkali metal, the former are WEAKER reducing agent.

When sodium metal is heated in a free SUPPLY of air, sodium peroxide (Na2O2) ALONG with small amount of sodium oxide is formed. When sodium peroxide is dissolved in water, hydrogen peroxide is produced

For example, the reaction of methylene generated from photolysis of diazomethane with cis-2-butene or with trans-2-butene each give a single diastereomer of the 1,2-dimethylcyclopropane product: cis from cis and trans from trans, which proves that the methylene is a singlet.

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ong>Answer:

Both assertion and reason are TRUE and reason is the CORRECT explanation of Assertion.

Engineers, as PRACTITIONERS of engineering, are professionals who invent, design, analyze, build and test machines, complex systems, structures, gadgets and MATERIALS to fulfill functional objectives and requirements while considering the limitations IMPOSED by practicality, regulation, safety and cost.

ong>Answer:

An oxide is a chemical COMPOUND that contains at least one oxygen atom and one other element in its chemical FORMULA. "Oxide" itself is the dianion of oxygen, an O2– (MOLECULAR) ION. Metal oxides thus typically contain an anion of oxygen in the oxidation state of −2.

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c) the COLOUR remains the same

235 and 238 RESPECTIVELY

ong>ANSWER:

EVALUATION

here it is given that a solution has 50G of salt in320g of water

so MASS of the solution

=320g+50g

=370g

so the required mass percent of the salt in the solution

=mass of the salt÷mass of the solution ×100%

=50÷370×100%

=13.51%

so SAD for you

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