Explore topic-wise InterviewSolutions in Current Affairs.

just SWITCH it on

Explanation:

WAIT for it

i am not saure your intellient

ong>ANSWER:

I cannot UNDERSTAND ur language it's probably Espanol PLEASE post it in ENGLISH(US)

ong>Explanation:

the oxidation number change method the underlying principle is that the gain in the oxidation number (number of electrons) in one reactant must be equal to the loss in the oxidation number of the other reactant.

Equation:

Zn + NO3- = NH4+ + Zn2+

Acidic medium Basic medium

Submit

Practice exercises Balanced equation

Step 1. Write down the unbalanced equation ('skeleton equation') of the chemical reaction. All reactants and products must be known. For a better result write the reaction in ionic form.

Zn + NO3- → NH4+ + Zn2+

Step 2. Separate the process into half reactions. A redox reaction is nothing but both oxidation and reduction reactions taking place simultaneously.

a) Assign oxidation numbers for each atom in the equation. Oxidation number (also called oxidation state) is a measure of the degree of oxidation of an atom in a substance (see: Rules for assigning oxidation numbers).

Zn0 + N+5O-23- → N-3H+14+ + Zn+22+

b) Identify and write out all redox couples in reaction. Identify which reactants are being oxidized (the oxidation number INCREASES when it reacts) and which are being reduced (the oxidation number goes down). Write down the transfer of electrons. Carefully, insert coefficients, if necessary, to make the numbers of oxidized and reduced atoms equal on the two sides of each redox couples.

O:Zn0 → Zn+22+ + 2e- (Zn)

R:N+5O-23- + 8e- → N-3H+14+ (N)

c) Combine these redox couples into two half-reactions: one for the oxidation, and one for the reduction (see: Divide the redox reaction into two half-reactions).

O:Zn0 → Zn+22+ + 2e-

R:N+5O-23- + 8e- → N-3H+14+

Step 3. Balance the atoms in each half reaction. A chemical equation must have the same number of atoms of each element on both sides of the equation. Add appropriate coefficients (stoichiometric coefficients) in front of the chemical formulas to balance the number of atoms. Never change any formulas.

a) Balance all other atoms except hydrogen and oxygen. We can use any of the species that appear in the skeleton equations for this purpose. Keep in mind that reactants should be added only to the left side of the equation and products to the right.

O:Zn0 → Zn+22+ + 2e-

R:N+5O-23- + 8e- → N-3H+14+

b) Balance the charge. For reactions in an acidic solution, balance the charge so that both sides have the same total charge by adding a H+ ion to the side deficient in positive charge.

O:Zn0 → Zn+22+ + 2e-

R:N+5O-23- + 8e- + 10H+ → N-3H+14+

c) Balance the oxygen atoms. Check if there are the same numbers of oxygen atoms on the left and right side, if they aren't equilibrate these atoms by adding water molecules.

O:Zn0 → Zn+22+ + 2e-

R:N+5O-23- + 8e- + 10H+ → N-3H+14+ + 3H2O

Balanced half-reactions are well tabulated in handbooks and on the web in a 'Tables of STANDARD electrode potentials'. These tables, by convention, contain the half-cell potentials for reduction. To make the oxidation reaction, simply reverse the reduction reaction and change the sign on the E1/2 value.

Step 4. Make ELECTRON gain equivalent to electron lost. The electrons lost in the oxidation half-reaction must be equal the electrons gained in the reduction half-reaction. To make the two equal, multiply the coefficients of all species by integers producing the lowest common multiple between the half-reactions.

O:Zn0 → Zn+22+ + 2e-| *4

R:N+5O-23- + 8e- + 10H+ → N-3H+14+ + 3H2O| *1

O: 4Zn0 → 4Zn+22+ + 8e-

R:N+5O-23- + 8e- + 10H+ → N-3H+14+ + 3H2O

Step 5. Add the half-reactions together. The two half-reactions can be combined just like two algebraic equations, with the arrow serving as the equals sign. Recombine the two half-reactions by adding all the reactants together on one side and all of the products together on the other side.

4Zn0 + N+5O-23- + 8e- + 10H+ → 4Zn+22+ + N-3H+14+ + 8e- + 3H2O

Step 6. Simplify the equation. The same species on opposite sides of the arrow can be canceled. Write the equation so that the coefficients are the smallest set of integers possible.

4Zn0 + N+5O-23- + 10H+ → 4Zn+22+ + N-3H+14+ + 3H2O

Finally, always check to see that the equation is balanced. First, verify that the equation contains the same type and number of atoms on both sides of the equation.

ELEMENT LEFT RIGHT DIFFERENCE

Zn 4*1 4*1 0

N 1*1 1*1 0

O 1*3 3*1 0

H 10*1 1*4 + 3*2 0

Second, verify that the sum of the charges on one side of the equation is equal to the sum of the charges on the other side. It doesn't matter what the charge is as long as it is the same on both sides.

4*0 + 1*-1 + 10*1 = 4*2 + 1*1 + 3*0

9 = 9

Since the sum of individual atoms on the left side of the equation matches the sum of the same atoms on the right side, and since the charges on both sides are equal we can write a balanced equation.

4Zn + NO3- + 10H+ → NH4+ + 4Zn2+ + 3H2O

5 STEPS because I am a NEW CUSTOMER and I am a new customer

ong>Answer:

find it on doubt nout I'm sure you will GET the correct answer

Explanation:

give me a thanks ❤️ MARK as BRAINLIEST follow me

ong>Answer:

26.47 %

Explanation:

Mass of SOLUTE = 36 G

    Mass of solvent = 100g

    Mass of solution = 100 + 36

                           = 136g

Concentration of solution = (Mass of solute / Mass of solution ) X100

                                  = (36/136) x 100

                                  = 26.47%

Mark me as brainliest.....

C is your CORRECT answer 4:2

11th

Chemistry

Chemical Bonding and Molecular Structure

Basics of Chemical Bonding

Calculate formal charge of ...

CHEMISTRY

avatar

Asked on December 27, 2019 by

Rishika Brar

Calculate formal charge of atoms HClO

4

,CO

3

2

.

HARD

Help best friend

Study later

ANSWER

The formal charge on three oxygen atom has electron pair shared by chlorine,

Cl=

2S−L

v−1

=0=

2×2−6

6−1

=−1

The formal charge on the oxygen atom having an electron pair shared by chlorine and HYDROGEN, then the formal charge is :

0=

2×2−0

1−1

=0

Formal charge onH is 0=

2×2−0

1−1

=0

For the Co

3

2

For the oxygen:

6−4−

2

1

×4=0

For the carbon atom:

4−0−

2

1

×8=0

For the second oxygen:

6−6−

2

1

×2=−1

plz make my answer brilliant if my answer is CORRECT

y7070yc07yc79cu9c0yviujobojcypuc8tyxi

ong>Answer:

molality of 648 G pure WATER is 55.56 m

mark me as brainleist................

plzzzzzzzzzzzz

ong>Answer:

But during REDUCTION SUBSTANCE never UNDERGOES LOSS of electrons

Please mark me as brainliest

ong>ANSWER:

I also have

Please mark me as BRAINLIEST

PlS PLS

ong>ANSWER:

Sorry I can't understand your question. Please POST PROPER QUESTIONS.

true

Explanation:

The number of electrons and PROTONS are always EQUAL in all atoms.

This MAINTAINS the electrical neutrality of the atom as the positive charges are BALANCED with negative charges.

If the number of electrons and protons are not equal, then the atom will have a net positive or negative charge and it will form a cation or an anion.

Therefore, the statement is true.

How satisfied are you

The mole (symbol: mol) is the UNIT of measurement for amount of substance in the International System of UNITS (SI). A mole of a substance or a mole of PARTICLES is defined as exactly 6.02214076×1023 particles, which may be atoms, molecules, ions, or electrons.

Unit of: Amount of substance

Unit system: SI base unit

SI base units: Base unit (DIMENSIONLESS)

Explanation:

hope it helps you mate have a good day ❤️✌️

ong>Answer:

Photoelectric effect, phenomenon in which electrically charged particles are released from or WITHIN a MATERIAL when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a METAL plate when light falls on it.

Answer. Y, that is, the HARDEST naturally occurring substance in the world is diamond. The substance Z, which is a good CONDUCTOR of electricity is GRAPHITE. Both diamond and Graphite come from Carbon, a non-metal which lacks lustre, and also does not conduct electricity.

ong>Answer:

Please MARK as brain LIST answer

EXPLANATION:

I will follow you

ong>Explanation:

Deposits of calcium CARBONATE, CaCO3, FREQUENTLY develop on Portland cement concrete and on masonry units, including brick and tile, which have been BONDED with Portland cement. These surface deposits are termed efflorescence and are most frequently encountered in new or recent construction. While efflorescence is not normally damaging, except possibly to decorative coatings, it is aesthetically undesirable. The origin of efflorescence is EXPLAINED and a physicochemical model is developed to explain and quantify the key features of its formation. Calculations and experiments highlight the important role of soluble alkalis in the formation of efflorescence. Mechanistic interpretations and calculations suggest ways in which efflorescence can be mitigated by interrupting one or more steps of the PROCESS in conjunction with improved materials selection.

thank you

please mark as brainliest

A mixture is a material containing two or more elements or COMPOUNDS that are in close contact and are mixed in any proportion. For example, air, SEAWATER, crude oil, etc. The constituents of a mixture can be separated by physical means like filtration, evaporation, sublimation and magnetic separation

OR

The components of a mixture can be separated by physical methods. For example, a homogeneous mixture of two liquids can be separated using fractional distillation method. Two liquids have different boiling points.

The components of a mixture can be separated by physical methods. For example, a homogeneous mixture of two liquids can be separated using fractional distillation method. Two liquids have different boiling points. Thus, CCl 4 (b.pt 350 K) and anisole (b.pt 427 K) can be separated by fractional distillation. More volatile CCl 4 will distill out first, followed by LESS volatile anisole.

Explanation:

hope this would be helpful to you

ong>Answer:

1.The members of the alkaline earth metals include: beryllium (Be), magnesium (Mg), CALCIUM (Ca), STRONTIUM (Sr), barium (BA) and radium (Ra). As with all families, these elements SHARE traits. While not as reactive as the alkali metals, this family knows how to make bonds very easily.

The radioactive nuclei, or radionuclides, found naturally on Earth can be grouped into three series–headed by uranium-238, uranium-235, and thorium-232–plus several isolated beta-particle emitting nuclei, most prominently potassium-40 and rubidium-87. AVERAGE abundances of these nuclides are listed in Table 15-1.

The member least reactive is LITHIUM

PLEASE MARK AS BRAINLIEST

BOND ENTHALPY

ong>ANSWER:

a) SOURING of milk

b) MAKING ice cubes

ong>Answer:

Himalayan rivers are perenial and PENINSULAR rivers are RAIN FED

INAPPROPRIATE answer mate.....

complete it first

Hug+o2 its EQUATION Will be

to SOLVE these LIKE these

ong>Answer:

Stoichiometric Coefficients

Stoichiometric CoefficientsThe balanced equation makes it possible to convert information about ONE reactant or product to quantitative data about another element. Understanding this is ESSENTIAL to solving stoichiometric problems

All stoichiometric calculations begin with a balanced equation. Balanced EQUATIONS are NECESSARY because mass is conserved in every reaction. The number and kinds of atoms must be the same in the reactants and products. ... In mass calculations, the molar mass is needed to convert mass to moles.

I hope it will help you..please give thanks.

MAGNESIUM and chloride

Mg+2Cl----->MGCL2

1=c

2=mg magnesium

3=d

4=c

5=b

6=b

Explanation:

PLS MAK as BRANLIEST

Co2

Explanation:

HOPE it helps MARK as brainliest

ong>Explanation:

1. trivalent

2. two

3.

4.Na2CO3+2Hcl -- > 2 Nacl+ CO2+H2O

5. 2 NAHCO3 ---> Na2CO3+H2O+CO2

please make me brainlist

1 calcium, 1 carbon and 3 atoms of oxygen as CARBONATE, hence - 12+40+16×3= 100. Now by AVOGADRO's number (6.022×10^23) we will have mass of approx. 100gms as the mass.

make me brainliest

ong>Answer:

380 to 700 nanometers

The visible LIGHT spectrum is the segment of the

Explanation:

The visible light spectrum is the segment of the ELECTROMAGNETIC spectrum that the human eye can view. More simply, this range of wavelengths is CALLED visible light. TYPICALLY, the human eye can detect wavelengths from 380 to 700 nanometers.

HYDROGEN CHLORIDE (HCl), is a compound because it is made up of two elements hydrogen and CHLORINE...

ong>Explanation:

The alkaline-earth metals tend to lose TWO electrons to form M 2+ ions (Be2+, Mg2+, CA2+, and so on). These metals are LESS reactive than the neighboring ALKALI metal. Magnesium is less active than SODIUM; calcium is less active than potassium; and so on.

ong>Answer:STRONG>

Sulfuric Acid, H2SO4 is a chemical compound because it is made up of two HYDROGEN atom, one sulfer atom, and four oxygen ATOMS. Sulfuric acid is a strong acid, soluble in water, very polar and is an excellent solvent. Its APPLICATIONS include the production of fertilizers and DETERGENTS.

ong>ANSWER:

The electron CONFIGURATION of a neutral sodium atom is 1s22s22p63s1 .

this is your answer bro

Explanation:

first TIME iam asking mark me as brainlist PLEASE I helped you

sorry I didn't KNOW the answer FORGIVE me

ong>ANSWER:

Yes, all THINGS are MADE of ATOMS, and all atoms are made of the same three basic particles - protons, neutrons, and electrons.

ong>ANSWER:

EXPLANATION:

Answer:

50

Explanation:

first calulate the milimolesof NaCl = 1/20 × 20 = 1 milimole

now 1 milimoles is required for cougualtion of 20 ml therfore for one LITTER 50 milimoles are required.

hope it helps  u buddy..

pls mark me as brainliest : )

Radioactivity. All of the alkaline earth metals, except magnesium and strontium, have at LEAST one naturally occurring RADIOISOTOPE: beryllium-7, beryllium-10, and calcium-41 are trace radioisotopes. Calcium-48 and barium-130 have very long half-lives and THUS occur naturally. All isotopes of radium are radioactive.

square of the WAVE function, Ψ2, HOWEVER, does have physical significance: the probability of finding the particle described by a specific wave function Ψ at a given point and time is PROPORTIONAL to the VALUE of Ψ2. ...

hope it will HELP you plz mark me as brainlist and plz follow me❤

HOPE it's HELPED you...

on, STABLE subatomic PARTICLE that has a POSITIVE charge equal in magnitude to a UNIT of electron charge and a rest MASS of 1.67262 × 10−27 kg, which is 1,836 times the mass of an electron.

ong>Answer:

When treated with HBr or HCL alcohols TYPICALLY undergo a nucleophilic substitution reaction to generate an alkyl halide and water. Alcohol relative reactivity order : 3o > 2o > 1o > methyl. Hydrogen halide reactivity order : HI > HBr > HCl > HF (paralleling ACIDITY order).