pls help and explain why

Start by assigning oxidation numbers to the atoms that take part in the reaction.

notice that the oxidation state of zinc changes from zero on the reactants' side to +2 on the products' side, which means that it is being oxidized.

Now take a look at nitrogen's oxidation state. Notice that some nitrogen atoms keep their oxidation state constant, i.e. +5 on both sides of the equation, but that other nitrogen atoms change their oxidation state from +5 to -3, which implies that they are being reduced. Balance the nitrogen atoms first by multiplying the nitric acid by 2. Since you're in acidic solution, you can balance the hydrogen atoms by adding protons,

H

+

, to the side that lacks hydrogen, and oxygen atoms by adding water molecules to the side that lacks oxygen.

Since you only need to balance the hydrogen atoms present on the reactants' side.

Hope that can start you off! And hope that helps!

The balanced chemical equation of the given reaction is written as follows:

[tex]\rm Zn(s)+2HNO_3(aq) \rightarrow Zn(NO_{3})_2(aq)+H_2(g)[/tex]

A balanced chemical equation is a symbolic representation of a chemical reaction that shows the exact number of atoms of each element present in both the reactants and the products.

In a balanced equation, the total number of atoms of each element on the reactant side of the equation must be equal to the total number of atoms of that element on the product side of the equation.

This ensures that the law of conservation of mass is upheld, which states that matter cannot be created or destroyed in a chemical reaction, only rearranged.

The balanced chemical equation is written above.

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The isotope that has the highest percent abundance is Os-190.

We know that the amount of the element that can be found in the universe does differ because the element is composed of isotopes. The isotopes are the atoms of the element that have the same atomic number but does have different mass numbers.

Now we know that the two common isotopes of osmium are Os-190 and Os-191. The isotope that would have the highest percent abundance is the isotope whose mass is closer to the relative atomic mass of osmium which is 190.23.

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Answer:

It's a chemical change.

Explanation:

The process of burning (as opposed to evaporating) is a chemical reaction, a chemical change. The wax molecules are undergoing a chemical change; they are changing into different molecules by reacting with a substance in the air.

viral symmetry that is both icosahedral and helical and possibly other symmetry is collectively referred as complex.

what is symmetry?

Chemistry terms like "molecular symmetry" refer to the symmetry that exists in molecules as well as how they are categorised. As it may be used to predict or explain many of a molecule's chemical characteristics, including its dipole moment and its permitted spectroscopic transitions, molecular symmetry is a key concept in chemistry.

An action that results in an object's appearance remaining unchanged is known as a symmetry operation. For instance, a water molecule will retain its original appearance if it is rotated by 180 degrees around an axis that runs through the centre O atom (located in the middle of the two H atoms). Each symmetry operation has a corresponding symmetry element, which can be an axis, a plane (2 dimensions), a line (1 dimensions), or a point (0 dimensions), with regard to which the symmetry operation is performed

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The ground state electronic configuration of Nitrogen atom is 1s²2s²2p³

The ground state electronic configuration of vanadium atom is 1s²2s²2p⁶3s²3p⁶4s²3d³

Electron configuration is the distribution of electrons within an atom or molecule (or other physical structure) in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s²2s²2p⁶. This means that the 1s, 2s and 2p subshells have 2, 2 and 6 electrons respectively.

The electronic configuration of a type of atom (neutral or ionic) allows us to understand the shape and energy of its electrons. Many general rules are followed in assigning an electron's "position" to its possible energy states, but these assignments are arbitrary and it is always unknown which electron is being described. Knowing the electronic configuration of a species allows us to better understand its binding ability, magnetism and other chemical properties.

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The formula 2n², where n is the primary energy level, can be used to calculate the maximum amount of electrons in each energy level (first quantum number).

The nucleus is the center of the orbits. One orbital will be larger than the others if an atom has several orbitals, or they will overlap. Additionally, an atom is perhaps most likely to occur in the electron shells. Orbitals, or groups of electrons arranged in a cloudlike pattern, surround the nucleus.

The highest level of probability for an electron to exist is in an atom's nucleus. The route that electrons travel while navigating the restrictions of the circle is referred to as a subshell. There are four different subshell classifications. The letters s, p, d, & f are used to identify the ​such​.

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Answer:

Electronic configuration An element's atomic number tells you the number of protons in the nucleus. The number of protons in an atom is equal to the number of electrons. In the first shell of an atom there are 2 electrons. In the third shell there are 18 electrons.

The percent error of Joe’s results is equal to 10.07 %

The percent error can be described as the difference between the actual value and the measured or approximate value. The percent experiment is used in scientific experiments to check the accuracy of the experimental results.

The mathematical formula of the percent error can be represented as:

Percentage error = (Measured value - Exact value)/Exact value] ×100

Given, the volume measured by Joe = 60.1 ml

The actual volume of the object = 54.6 ml

The percent error =  (60.1 - 54.6)/54.6] ×100 = 10.07 %

Therefore, the percentage error of Joe's results is 10.07 %.

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The solubility of MgCO3 in water will increase if 0.1m HNO3 is added to the solution at 298k.

Magnesium carbonate (MgCO3) is basic in nature and insoluble in water but when 0.1m HNO3 (acidic) is added the MgCO3 will dissociate due to the opposite nature that is MgCO3 is basic and HNO3 is acidic. This will lead to an increase in solubility. The balanced equation of this reaction is:

MgCO 3 (s) + 2 HNO 3 (aq) → Mg(NO 3) 2 (aq) + CO 2 (g) + H 2O (l)

The equilibrium constant for the dissolution of a solid substance into an aqueous solution is the solubility product constant. Ksp is used to represent it.

A type of equilibrium constant, the solubility product's value changes with temperature. Due to increasing solubility, Ksp often rises as temperature rises.

A substance's ability to dissolve in a solvent to create a solution is known as a substance's solubility. Ionic compounds, which separate into cations and anions, have a wide range of solubilities in water. While other substances are exceedingly insoluble, some are highly soluble and may even absorb moisture from the air.

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Answer:

Just as the organs in an organ system work together to accomplish their task, so the different organ systems also cooperate to keep the body running. For example, the respiratory system and the circulatory system work closely together to deliver oxygen to cells and to get rid of the carbon dioxide the cells produce.

Explanation:

In qualitative analysis, the student should omit the steps 1B-1E which leads us to omitting steps which involves the presence of Pb and Ag.

What is qualitative analysis?

In qualitative analysis, information that is non-numerical about a chemical species, a reaction, etc. are determined. Qualitative analysis is not a reliable analysis but it often easier, faster and is a lot cheaper to perform that the quantitative analysis. Qualitative Analysis deals with the grouping or identification of elements present in the sample. It is a standard procedure to classify the methods in two classes and those are qualitative inorganic analysis and qualitative organic analysis.

Hence, In qualitative analysis if there is no precipitate, student should omit the step 1B-1E.

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The student should omit steps 1B through 1E, which leads us to omit steps involving the presence of Pb and Ag, when performing a qualitative analysis.

What is qualitative analysis?
Qualitative analysis is used to determine non-numerical information about a chemical species, a reaction, etc. Although qualitative analysis is less accurate than quantitative analysis, it is frequently quicker, simpler, and much less expensive to conduct. The grouping as well as identification of elements found in the sample is the focus of qualitative analysis. The methods are typically divided into two categories: qualitative inorganic analysis as well as qualitative organic analysis.

Hence, In qualitative analysis if there is no precipitate, student should omit the step 1B-1E.

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After alpha particles were bombarded onto sheets of gold, the Rutherford model was developed. This model proposed that the atom was composed of a small, dense, positively charged core called the nucleus, with electrons orbiting around this nucleus.

The Rutherford model is a model of the atom that was proposed by Ernest Rutherford in 1911. It was based on his experiments with alpha particles. In the model, the atom is composed of a small, dense nucleus with positive charge surrounded by electrons that orbit the nucleus. The Rutherford model is unable to explain the stability of atoms and the nature of the electromagnetic force, but it did provide a starting point for the development of more sophisticated models of the atom.

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Nuclear equation: ninety-two 238 U → ninety 234 T h + 2 4 H e + power.

In nuclear physics and nuclear chemistry, a nuclear response is a method in which two nuclei, or a nucleus and an external subatomic particle, collide to supply one or greater new nuclides. accordingly, a nuclear response need to purpose a transformation of at the least one nuclide to some other.

Nuclear Fusion reactions electricity the sun and other stars. In a fusion response, two light nuclei merge to form a single heavier nucleus. The method releases strength due to the fact the whole mass of the resulting single nucleus is less than the mass of the two unique nuclei. The leftover mass turns into energy.

Nuclei with too many neutrons, too few neutrons, or which might be absolutely too massive are risky. They eventually rework to a stable form thru radioactive decay. wherever there are atoms with risky nuclei, there are nuclear reactions taking place clearly.

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Two lactate dehydrogenase isoenzymes interacting

what is affinity chromatography?

Affinity chromatography is a technique for extracting a biomolecule from a mixture that relies on a very particular macromolecular binding relationship between the biomolecule and another component. Depending on the biomolecule of interest, the specific type of binding contact may be between an antigen and an antibody, an enzyme and a substrate, a receptor and a ligand, or a protein and a nucleic acid. Binding interactions are routinely used to isolate different biomolecules. When compared to other chromatographic techniques, affinity chromatography is advantageous due to its high selectivity and resolution of separation.

In order to study the effects of pH and temperature on lactate dehydrogenase binding, immobilized NAD+ matrices were used to study the interactions of two isoenzymes of lactate dehydrogenase from pig heart muscle (H4) and rabbit skeletal muscle (M4). Investigated was how substrate, product, and sulphite affected the binding of heart muscle lactate dehydrogenase to immobilised NAD+. It was determined how the two lactate dehydrogenase isoenzymes interacted with immobilised pyridine and adenine nucleotides and their derivatives. Correlations between these factors' effects on lactate dehydrogenase's interaction with immobilised nucleotides and the known kinetic and molecular characteristics of the enzymes in free solution were found.

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Alkali carbonates are soluble in water so (NH₄)2CO₃ sodium carbonate and potassium carbonates are soluble in water.

A composite is a material comprised of two or more constituent parts. Examples of molecules are carbon dioxide, freshwater, and table salt. a substance produced by the chemical joining of two or three dissimilar components. Examples of compounds are salt (NaCl), which is made up of chloride and sodium atoms, and water (H2O), which would be made up of hydrogen and oxygen atoms.

When a group of atoms unite to form a pure material, a compound is created. These can be reduced to their individual atoms. Atoms from the reactants interact during chemical reactions to create new compounds. Reactants are the species that are reacting, while products are the results of the reaction.

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The complete table shows characteristics of gas law :      

                               Variables                    constant               Equation

Boyles law        pressure , volume         Temperature        PV = k

Charles law     volume ,temperature      pressure             V = kT

Gaylussac law  pressure, temperature      volume            P = kT

combined       pressure, temperature    no. of moles        PV = kT

     gas law                       volume                        

1) The Boyles law states that : The pressure of the gas is inversely proportional to volume of gas.

P ∝ 1/V

PV = k

k is constant

2) The Charles law `states that at constant pressure the volume is directly proportional to temperature of gas.

V ∝ T

V = kT

3) The gay - lussac law states that at constant volume pressure is directly proportional to temperature.

P ∝ T

P = kT

4) The combined gas law is the combination of temperature , pressure and volume .

PV = kT

Thus, The complete table shows characteristics of gas law :      

                              Variables                    constant               Equation

Boyles law        pressure , volume         Temperature        PV = k

Charles law     volume ,temperature      pressure             V = kT

Gaylussac law  pressure, temperature      volume            P = kT

combined        pressure, temperature    no. of moles        PV = kT

     gas law                        volume                        

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Answer:

The answer is A: temperature and moles of gas

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Given the electronegativity values of c (2.5), n (3.0), o (3.5), and s (2.5), The following molecules have polar bonds answer is all of the above.

There is bond between carbon and oxygen. So , bund is polar . since they have different electro negativities

The electronegativityes O' and s'are different. so, bond is polar and There is difference is electronegativityes between N and O, Sois polar bond.

When an atom of a certain chemical element forms a chemical bond, it has a propensity to draw shared electrons, which is denoted by the symbol, which stands for electronegativity. The atomic number of an atom and the separation of its valence electrons from the charged nucleus both have an impact on how electronegtive that atom is. The atom is more in need of an electron when the electronegativity is higher. o Electronegativity grows across a period from left to right. o The attraction of an atom on the electrons in a bonding pair is strongest when the valence shell is nearly full.

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The mass of the 65Cu isotope can be determined using the formula below. - To obtain the mass of the 65Cu isotope, replace all the known values in the formula above. - The mass of the 65Cu isotope is therefore 64.9233 amu. So, "Option C" is the right response.

Average atomic mass of copper=63.546 amu

On putting given values we get:

63.546= 100

62.9298 ×69.09+M

2 ×30.91

on solving we will get mass of  65

Cu isotope =64.9233

The total mass of an atom is made up of all of its protons and neutrons.

"Isotopes" is the name used to describe atoms having differing atomic weights caused by various neutron counts. The protons in isotope elements are the same, but the neutron content varies.

The total mass of the protons and neutrons in an atom's nucleus is known as its atomic mass. With 6 protons and 7 neutrons in its nucleus, this carbon isotope has a 13-atom mass, or 7+6=6. It has an atomic mass of 13 mass units. (amu).

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In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge.  Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The correct option is option A.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

Quarks are present in protons and neutrons but not in electrons. Quarks are sub-atomic particles that have mass, but not an integer of charge.

Therefore, the correct option is option A.

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The rotational spectroscopy looks like many peaks joined together in the shape of parabola. The number of peaks depends on the shape of the molecule. The peaks are 2B distance apart from each other.

What is rotational spectroscopy?

Rotational spectroscopy is an absorption spectroscopy where the energies of transitions between the energy levels of a molecule in the gas is measured. It is also called as microwave spectroscopy. Rotational spectroscopy only works on the molecules which have permanent dipole moment.

In rotational spectroscopy each line represents a transition between energy levels.

E = BJ (J+1)  

where J = energy level, B = rotational constant.

When the transition is from J = 0 to J = 1,

E = E(f) - E(i) = B x 1 (1+1) - B x 0 (0+1) = 2B - 0B = 2B.

Therefore, the spacing between the peaks in Rotational spectroscopy is 2B. The number of peaks depends on the shape of the particular molecule.

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The volume of 0.250 m sulfuric acid necessary to react completely with 74.3 g sodium hydroxide is 3.7 L.

The chemical reaction of sulfuric acid and sodium hydroxide is given as below:

H2SO4 + 2NaOH ------- Na2SO4 + 2H2O

From above, we noticed that, one mole of sulfuric acid react with two moles of sulfuric acid.

Therefore, firstly we convert grams of sulfuric acid into moles.

As we know that, molar mass of sodium hydroxide is 40 g.

It is defined as the given mass to the molar mass of substance.

Mathematically,

Moles = Given mass / molar mass

Given mass of sulfuric acid = 74.3 g

By substituting all the values, we get

Moles = 74.3 / 40

= 1.85 mol

So, 1/2 moles of sulfuric acid one moles of sodium hydroxide.

Or, 1.85 moles of sodium hydroxide react with 1/2 × (1.85) moles of sulfuric acid.

1.85 moles of sodium hydroxide react with 0.925 moles of sulfuric acid.

Now,

Concentration of sulfuric acid = 0.250 M

Moles of sulfuric acid = 0.925 mol

C = m/ V

V = m/ C

= 0.925/ 0.250 = 3.7 L

Thus, we concluded that the volume of 0.250 m sulfuric acid necessary to react completely with 74.3 g sodium hydroxide is 3.7 L.

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The partial pressure of nitrogen gas is 1.43 x 10^-3 M to be exact, but we can also consider it as 1 atm.

Partial pressure can be defined as- if a container filled with more than one gas, each gas exerts pressure. The pressure of anyone gas within the container is called its partial pressure.

   As we know, pressure is the force per unit area. Partial pressure can be the pressure half-filled the area.

        Ideal gas behavior allows gas mixtures to be specified simply. In particular, the ideal gas law holds for each component of the mixture separately. Each component exerts its own pressure referred to as its partial pressure.

     Partial pressure is the measure of the thermodynamic activity of gas molecules. The gasses diffuse and react based on their partial pressures and not concentrations in a gaseous mixture.

Complete question: -

The solubility of N2 gas in blood is 6.10 x 10^-4M when the partial pressure of N2 gas is 1.00 atm and the temperature is 37-degree C. If a scuba diver breathes compressed air with a total air pressure of 3.00 atm, what is the solubility of N2 in her blood?

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The caloric value(in kcal/g) of the potato chips is 0.04467 kcal/g.

Heat absorbed by water:

[tex]Q=m.C.T\\Q=26.8 * (21.4-16.4)*1\\Q=0.134[/tex]

The caloric value of potato chips :

=Kcal/grams of potato chips

[tex]=0.134/3.0\\=0.04467 Kcal/g[/tex]

How to calculate heat absorbed?

Q = mc∆T

What is caloric value?

A food calorie is actually a “kilocalorie.”  In other words, it is the amount of energy needed to raise the temperature of one liter of water by one degree.

Thus, the caloric value of the potato chips is 0.004467Kcal/g

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A correlation between changes in global climate with methane and carbon dioxide levels is Variations in ice layer color and thickness.

Ice cores provide direct information about how greenhouse gas concentrations have changed in the past, and also provide direct evidence that climate can change rapidly. By examining the gas trapped in the ice core, scientists learned the amount of carbon dioxide for the first time.

Global temperature has been associated with at least the last million years of Earth's history. A particularly powerful correlation technique is to use the composition of atmospheric gases trapped in ice bubbles. Since most gases remain in the atmosphere long enough to be well mixed on a global scale, ice cores around the world simultaneously exhibit the same atmospheric composition with trapped gas bubbles.

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The combination of the chlorine and the chromium species is designated by the reaction [tex]2Cr + 3Cl_{2} ------- > 2CrCl_{3}[/tex]. Option B

We know that the term reaction has to do with the way in which two atoms are combined in a compound. Now, the reaction must be balanced. This implies that the number of atoms on the reactant side must be the same as the number of atoms on the products side.

We are talking about how to write the reaction between the chromium atom and the chlorine atom. We know that we have to find out which of the reaction is balanced and that is; [tex]2Cr + 3Cl_{2} ------- > 2CrCl_{3}[/tex]

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Explanation:

a fraction 880/1000 or 22/25

mixed number 44/5

whole number 8

In a Grigmand reaction experiment, all the glass wake washed are complete without water druplet and dried leaving a single aIf it's not dried properly I molecules properly I water Hem aims im tube then this water as am acid the test molecule acts.

We realize Grignard reagents are robust bases one hundred twenty acts as an acid wherein. An or by derivative is a secondary by-product derived from a production system, manufacturing manner, or chemical reaction it is not the primary service or by-derivative being produced. facet products are impurities that appear throughout the response because of aspect reactions that may be opportunity response pathways or similar reactions.

An aspect reaction is a chemical response that occurs at an equal time as the actual foremost response, however to a lesser volume. It results in the formation of. A facet reaction is a reaction that produces a distinct spinoff aside from the preferred derivative. It happens concurrently with the principal reaction but to a lesser extent. for instance, when phenol is reacted with nitric acid the main reaction is the formation of o-nitrophenol.

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The ways to write a chemical equation for a chemical reaction are:

What is the term chemical reaction?

In a chemical reaction, reactants undergo a chemical reaction and transform into products through a chemical process. For instance, By inhaling oxygen, which then combines with glucose to produce carbon dioxide, water, and energy, we are able to breathe. The response is provided below. C6H12O6 + O2 = 6CO2 + 6H2O + Energy.

Note that Reactants are the substances that are changing and are written on the left-hand side of the equation. Products are the newly produced substances.

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Certain types of experiments must begin by heating a crucible to constant mass. The steps in this process are stated below:

Heating a crucible is very crucial to maintain the measurement as thoroughly as possible. The porcelain crucibles are hygroscopic as they absorb weighable moisture from the air. We could get rid of moisture as much as possible by heating it.

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