1)Give an example of a useful product that involves an endothermic reaction or process
2)Give an example of a useful product that involves an exothermic reaction or process
​

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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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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For a given sample of ch3oh , the enthalpy change during the reaction is 82.7 kj. The mass of the methane gas will be 32 gram.

When methanol will provide some temperature, then it will break into methane and oxygen gas and release some amount of energy.

The balanced chemical equation can be written as:

[tex]2CH_{3}OH[/tex]→ [tex]2CH_{4} + O_{2}[/tex], ΔH= 82 kJ

It can be seen that 2 mole of methane will produce 82 kj energy.

Hence, the energy of 82.3kj the count of mole could be = (2×82.3)/82

 = 2 moles

The mass will be equivalent to the = 2 × 16 = 32 g

Therefore, the mass of [tex]CH_{4}[/tex] produced will be 32g

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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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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 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 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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Partition coefficient Chloroform = 11.98, Diethyl Ether = 2.81 and Benzene = 1.05      

Chloroform would be the ideal solvent to use when extracting the chemical from an aqueous solution because it has the highest solubility.

A solution is a homogenous mixture of one or even more solutes in a solvent. Adding sugar cubes to a cup of tea or coffee is an example of a solution. A property that facilitates the dissolution of sugar molecules is solubility. Solubility is the property of a substance (solute) to dissolve in a particular solvent. A solute is any solid, liquid, or gaseous substance that dissolves in a solvent.    

The compound needs 2 grams of solvent to dissolve it.

Finding solubility

For water, 2g/90ml= 2.22

For chloroform, 2g/7.50= 26.6

For diethyl ether, 2g/32= 6.25

For benzene, 2g/85= 2.35

Partition Coefficients -

For chloroform = 11.98

For Diethyl Ether = 2.81

For Benzene = 1.05

As a result of its high solubility, chloroform would be used to extract a compound from an aqueous solution.

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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 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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Answer is Δs=0.3kJ/K

Since, the tank is insulated rigid tank, The process is constant volume process,

Air as perfect gas

Obtain the properties from the table. Consider th state 1. P=100kPa, T, = 15°C

s=6.830kJ/kg-K

v=0.827 m³/kg

Constant volume process,

Consider the state 2. T = 40°C, v, v = 0.827 m²/kg

5,6.890 kJ/kg-K

Calculate the change in entropy,

Δs=m(s, -s) =5(6.890-6.830)

Δs=0.3kJ/K

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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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Answer:

Exoplanets

Explanation:

Exoplanets are planets beyond our own solar system. Thousands have been discovered in the past two decades, mostly with NASA's Kepler Space Telescope.

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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T-butyl chloride changes its ppt formed  and color more quickly with ague and an indicator than other chlorides do.

The hydrant A color shift was caused by the addition of AgNO3 when a product like Hl reacted with the acid-base indicator MethyL red. The released chloride ion was found by Agel precipitation at ambient temperature. Both a color change in an indicator and a precipitate format positively confirmed that the reactivity order in both cases is t-butyl chloride > n-butyl chloride. As a result, t-butyl chloride changes its ppt formed  and color more quickly with ague and an indicator than other chlorides do.

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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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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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A platinum wire is dipped into a strontium nitrate solution. Then inserted into a burner flame, then the strontium atoms emit a characteristic red color. this is an example of how an element can be identified by its unique atomic emission spectrum.

The goal of an atom's electron arrangement is to keep the energy of the atom as low as feasible. An atom's ground state has the lowest energy level of all the atoms. When the energy is applied to those atoms, the electrons take it in and go to a higher energy level. The electrons in atoms have quantized energy levels, which again means that they must transition from one level to another in discrete increments rather than constantly. An atom is said to be in an excited state when its potential energy exceeds that of the ground state. An excited atom is not a stable atom.

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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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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 density of the material would be 1.75 gm/cc.

p = n'∑Ac + ∑AA/VcNA

= n'(∑Ac + ∑AA)/9³NA

=n'(∑Ac + ∑AA)/(2(rA + rX))³ NA

n' = number of atoms per unit cell

= 4(assumption)

rA = 0.137 × 10⁻⁷ cm

rX = 0.241 × 10⁻⁷ cm

NA = Avagadros number

= 6.022 × 10²³

∑Ac = Atomic weight of all cations

∑AA = Atomic weight of all anions

p = n'(∑Ac + ∑∑AA)/(2(rA + rx))³NA

= 4(22.7 + 91.4/(2(0.137 × 10⁻⁷ + 0.241 × 10⁻⁷))³ 6.022× 10²³

= 1.75 gm/cc

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Answer:

The answer is sophisticated earthquake early-warning systems, increasingly accurate storm forecasting, and innovative flood risk and flood mitigation projects provide communities with the tools they need to respond to impending hazard events, and infrastructure design and engineering improvements help to reduce the damage suffered

Explanation:

I hope this helps

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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I would expect the dissolved oxygen levels from wаter entering а lаke to hаve lower thаn the lаke itself becаuse the steаm is аble to hаve wаrm wаter which cаn cаuse the lаke temperаture to be wаrm аlso. Hаving wаrm wаter meаns hаving less dissolved oxygen.

Dissolved oxygen (DO) is the аmount of oxygen thаt is present in wаter. Wаter bodies receive oxygen from the аtmosphere аnd from аquаtic plаnts. Running wаter, such аs thаt of а swift moving streаm, dissolves more oxygen thаn the still wаter of а pond or lаke. Heаlthy wаter should generаlly hаve dissolved oxygen concentrаtions аbove 6.5-8 mg/L аnd dissolved oxygen sаturаtion between аbout 80-120%.

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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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According to the given statement 1.24 M was the concentration of the hcl solution.

One of the main tools for connecting, managing, and running networked enterprise applications in a failover clustering infrastructure is a hyper - converged architecture (HCI) solution (HCI). Organizations may virtualize data, servers, and networks thanks to technology.

The balanced reaction is 2 HCl + Na₂CO₃ ==> CO₂ + H₂O + 2 NaCl

This shows that each mole of CO₂ created results in

There are two moles of HCl needed. So, starting with the atomic weights of carbon and oxygen, let's determine how many moles of CO₂ were produced.

Atomic weight carbon = 12.0107

Atomic weight oxygen = 15.999

Molar mass CO₂

= 12.0107 + 2 * 15.999

= 44.0087 g/mol

Moles CO₂ = 15.1 g / 44.0087 g/mol = 0.388559535 moles

We know we needed twice as much HCl based on the balanced equation,

so 0.388559535 mol * 2 = 0.77711907 mol

Simply divide the amount of moles by the number of liters because molarity is defined as moles per liter,

so: 0.77711907  mol / 0.625 l = 1.24339051 mol/l

Since our data only has three significant figures, round it to three figures to get 1.24 m.

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Answer:

Bile

Explanation:

Bile is secreted by the liver to help in the breaking down of food particles.​

The energy transfer in the form of light or heat is called radiant energy. Thus the flow of electric current can be called as radiant.

Radiation is a mod of energy transfer through vacuum and the electromagnetic radiations are such energy transfer from stars and space which hits the earth surface.

Sound is a mechanical wave only travels through a medium whereas electromagnetic waves does not need a medium to travel. Electromagnetic radiation is the combination of an electric field and magnetic field.

Hence, the flow of electric current by which the energy made available is called radiant.

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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.