Consider a 100 ml solution of a 0.0010 m solution of methyl amine, ch3nh2, where kb = 4.4 x 10-4 . a) what is the ph of this solution?

Sodium chloride is an ionic compound. The chemical name of Sodium chloride is NaCl.

Ionic compounds are made up of ions. They have charged particles. Ionic compounds when dissolved in solvents they form ions. Sodium chloride losses Na + and cl ions. Magnesium oxide will form mg2+ and O2 ions.

Ionic compounds dissolve in polar solvents. Examples are water, methanol and formamide. For ionic compounds to dissolve there will be ionic compounds will form.

Ionic bonds are not directional. There would be electrostatic or columbic attraction will be form in molecules.  The bonding seen in ionic compounds is called ionic bonding. There are two types of ions seen in molecules such as positive ions and negative ions.

Therefore, Sodium chloride is an ionic compound. The chemical name of Sodium chloride is NaCl.

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Answer: B

Explanation: JUST TOOK THE QUIZ

The balanced chemical equation for the precipitation reaction of CaCl₂ and Cs₃PO₄ in an aqueous solution is:

3Ca²⁺(aq) +  2PO₄³⁻(aq) → Ca₃(PO4)₂(s)

The insoluble salts Ca₃(PO4)₂ and CsCl are created when the calcium ion in CaCl₂ interacts with the phosphate ion in Cs₃PO₄. CaCl₂(aq) + CsO₄(aq) Ca₃(PO4)₂(s) + CsCl.  

The unbalanced reaction is:

CaCl₂(aq) + Cs₃PO₄(aq) → Ca₃(PO4)₂(s) + CsCl(aq)

To balance the calcium:

3CaCl₂(aq) + Cs₃PO₄(aq) → Ca₃(PO4)₂(s) + CsCl(aq)

The chlorides:

3CaCl₂(aq) + Cs₃PO₄(aq) → Ca₃(PO4)₂(s) + 6CsCl(aq)

And the Cs:

3CaCl₂(aq) + 2Cs₃PO₄(aq) → Ca₃(PO4)₂(s) + 6CsCl(aq)

This is the balanced reaction, the ionic equation is:

3Ca²⁺(aq) + 6Cl⁻(aq) + 6Cs⁺(aq) + 2PO4³⁻(aq) → Ca₃(PO4)₂(s) + 6Cs⁺(aq) + 6Cl⁻(aq)

Subtracting the ions that don't react:

3Ca²⁺(aq) +  2PO4³⁻(aq) → Ca3(PO4)2(s)

This is the net ionic equation

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Standard deviation refers to the percentage of responses that fall inside particular points on a bell curve, whereas relative standard deviation refers to the amount of a standard deviation as a measure of the mean. Although both can be stated as departures from the mean, neither can be negative.

The standard deviation measures how far a given collection of data deviates from the mean value. In contrast, a type of standard deviation is the relative standard deviation. The standard deviation calculates the accuracy of your results. It demonstrates how closely the outcomes matched the mean value.

While relative standard deviation quantifies the precision or standard deviation of the mean value. While relative standard deviation is referred to as RSD, the standard deviation is referred to as SD.

In chemistry, mathematics, and statistical calculations, the phrases standard deviation, and relative standard deviation are most frequently employed. These phrases are used to gauge a result's degree of precision. While relative standard indicates the amount of standard deviation, standard deviation measures how closely a result varies from the mean value. The standard deviation can be determined to be modest or significant. RSD and SD make analysis performance predictions. Our analysis is more accurate if these values are modest, and vice versa.

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An extensive property is a property that depends on the amount of matter in a sample.

An intensive property is a property of matter that depends only on the type of matter in a sample and not on the amount.  

Examples of Extensive properties:

Examples of Intensive properties:

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Answer:

Emission Spectrum of Hydrogen. When an electric current is passed through a glass tube that contains hydrogen gas at low pressure the tube gives off blue light. When this light is passed through a prism (as shown in the figure below), four narrow bands of bright light are observed against a black background.

Explanation:

that hydrone molecules Diprotic acids

The lindeman-hinshelwood mechanism explains that role of m as a stabilizing force for the reaction.

By steady state concentration,

d[O] dt = d[O3] dt =0 (7) we can solve for [O] and [O3]

What is the Lindemann-Hinshelwood mechanism?

The unimolecular processes that take place in the gas phase are explained by the Lindemann-Hinshelwood mechanism. This method is typically employed in both isomerization reactions and gas phase breakdown. The isomerization of cyclopropane is an illustration of isomerization through a Lindemann mechanism.

The steady state approximation makes the assumption that, after a brief initial period, the concentration of the chemical intermediates will be constant throughout time, meaning that the rate of change in the intermediate's concentration over time will be zero.

Thus by steady state concentration,

d[O] dt = d[O3] dt =0 (7) we can solve for [O] and [O3]

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coal is burned and co2 will be emitted into the atmosphere.

What is ppm?

PPM, or parts per million, is the most effective way to express the level of performance or chemical concentration in a bigger mixture. This could be used to describe the components of water, the faulty rate of a provider, etc. Being a ratio of two quantities of the same unit, it is theoretically a dimensionless measure that is represented as a percentage and is better suited to representing lesser concentrations of chemicals in gases, liquids, or solids.

When a coal is burned, it releases a certain amount of carbon dioxide (CO2) in relation to the energy it produces. Compare the quantity of CO2 released per unit of energy output or heat content to compare emissions across fuels.

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According to the research, the correct option is electron energies are quantized. Max Planck was a popular German physicist who proposed that electron energies are quantized, considered to be the founder of quantum theory.

It is a probabilistic and quantification theory by Max Planck giving the name of the minimum amount of clusters to atoms that radiates energy formed by corpuscles in the form of light or heat only, as small packets.

In this sense, Planck assumed that light does not travel as a particle but as packets of light in the form of electromagnetic radiation which he called quanta, this was the basis on which what is known as quantum theory was founded.

Therefore, we can conclude that according to the research, the correct option is electron energies are quantized. Max Planck was a popular German physicist who proposed that electron energies are quantized, considered to be the founder of quantum theory.

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The mass of HNO3 obtained is 12.46 g from the given reaction.

The chemical reaction is :

Potassium Nitrate + Sulphuric acid ------> Potassium Bisulphate + Nitric acid.

The above reaction is basically used for the making of nitric acid.

Less than 200 degree celcius the Nitric acid if more than 200 degree celcius then it will form Potassium Sulphate.

Now,

1 mol of KNO3 reacts with1 mol of concentrated H2SO4 to give 1 mol HNO3

Molar Mass of KNO3 = 101.1 g

Molar mass of H2SO4 = 98.07 g

Mass of H2SO4 that can react with 20 g of KNO3 = (20 g* 98.07 g )/ 101.1 g

= 19.4 g

Molar mass of nitric acid= 63.01 g

Hence mass of nitric acid  produced by 20 g of KNO3 = (20 g * 63.01 g ) / 101.1 g = 12.46 g

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Answer:

It must be based on a hypothesis

Explanation:

if i remember correctly

Answer:It actually does not matter in which order you add the three different liquids into your jar; the layers will always end up being the same: The corn syrup settles on the bottom, the colored water is in the middle and the vegetable oil floats on the top.

Explanation:

If you originally had 200 g of substance A , 50 g of reactant have left after 4 half - lives .

At four half life  the fraction remaining of a substance is 1/16 or 0.25 of initial concentration and percentage remaining is 25 % .

So , If you originally had 200 g of substance A is present then amount of reactant  left after 4 half-lives = 200 g × 0.25 = 50 g .

Example of half - life is given below ,

Within one half-life, the amount of radioactive nuclei present at any particular time will be reduced to half. For instance, if a sample contained 100g of Cf-251 at some point, there would still be 50g of Cf-251 after 800 years. There would only be 25g left after an additional 800 years (a total of 1600 years).

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In the quantum mechanical model of the atom, an electron is viewed as a wave-particle that occupies a three-dimensional space near the nucleus. The movement of the electron is describes be a function, which is also called an atomic orbital.

An electron possesses dual nature, i.e. it has both wave as well as particle nature.  

According to this theory, since there is wave associated with every electron so, it also possesses a wave function ψ.

However, there is no such physical significance of ψ but ψ² has.

ψ² tells the maximum probability of finding an electron in a particular region.

This region where the probability of finding an electron of an atom is maximum is known as atomic orbital.

There are different shapes of the atomic orbitals.

Some of the orbitals and their shapes are mentioned below:

(I) s orbital - spherical

(ii) p orbital - dum-bb-ell

(iii) d orbital - double dum-bb-ell

(iv) f orbital - ( no discrete shape)

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Answer:

d

Explanation:

it is the smallest

Answer:

1800

Explanation:

Use a Kilojoules to joules converter. Or to do it is:

One kilojoules is equal to 1000 joules:

1kJ = 1000J

The energy E(J) in joules (J) is equal to the energy E(kJ) in kilojoules times 1000:

E(J) = E(kJ) × 1000

Hope this helped you!

1. Sally's average speed is 35.38 miles/hr. She deserves no ticket

2. The 20.0 ft tall building is 6096 mm tall.

For the first problem, recall that: speed = distance/time.

The distance covered by Sally is 97 km within 102 minutes.

1 km = 0.62 miles

97 km =  0.62 x 97

            = 60.14 miles

60 minutes = 1 hr

102 minutes = 102/60

                    = 1.7 hours

The average speed of Sally can be calculated as:

               60.14/1.7 = 35.38 miles/hr

Since the speed limit is 65 mi/hr, this means Sally's speed is still within acceptable limits and does not deserve a ticket.

For the second problem:

1 ft = 12 inches

20 ft = 12 x 20

          = 240 inches

1 inch = 2.54 cm

240 inches = 2.54 x 240

                = 609.6 cm

1 cm = 10 mm

609.6 cm = 10 x 609.6

                 = 6096 mm

Thus, the 20.0 ft tall building is 6096 mm tall.

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The resonance structure of the c―h bond in acetone, (ch3)2c═o, has a pka of 19.2 is given below

When a periodic force is applied to a system and its natural frequency is equal to or nearly equal to the frequency of the applied force, resonance is the phenomenon of enhanced amplitude that results.

Since propane lacks a double bond or an atom with a lone pair of electrons, the negative charge on acetone's conjugate base cannot be sustained by resonance structure.

If the applied vibration's frequency matches the body's natural frequency, the body will begin to vibrate with a very significant amplitude. Resonance is the name given to this phenomena.

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An aqueous potassium iodate solution is made by dissolving 508 grams of  in sufficient water so that the final volume of the solution is 2.90 L then its  molarity is  0.818 M .

Calculation ,

Given mass ( m ) = 508 grams

molar mass ( M ) = 214 g/mol ( known )

Number of moles ( n ) = given mass/molar mass = 508 grams / 214 g/mol

Number of moles ( n ) = 2.37 moles

Volume of the  aqueous potassium iodate ( V ) in liter = 2.9 L

molarity is calculated as,

Molarity = number of moles / volume of the solution =  2.37 moles / 2.9 L

Molarity = 0.818 M

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The separation of the components of a mixture is based upon the fact that each component has different physical properties. The components of a mixture are separated based on their physical properties.

A mixture is the physical combination of two or more substances suspended in the form of a solution, suspension, or colloid. Mixtures generally are of two types: homogenous and heterogenous mixtures. Homogenous mixtures have a uniform composition as the particles are uniformly distributed. On the contrary, heterogeneous mixtures have a non-uniform appearance because of their easily distinguishable constituents distributed across the mixture.

The components of a mixture can be separated based on their physical properties by the methods like distillation, chromatography, filtration, etc. The physical properties based on which the components of mixtures can be separated include boiling point, ability to dissolve, or the size of constituent particles.

The varying physical properties contribute to separating molecules by evaporation, filtration, handpicking, etc.

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ca(oh)2(aq) + 2hcl(aq)®2 h2o(l) + cacl2(s)  

the limiting reactant when 1.00 g of each reactant is combined is ca(oh)2.

What is limiting reagent?

The stoichiometry of chemical processes states that a specific number of reactants are required for the reaction to be complete. Other names for them are limiting reactants and limiting agents.

In a chemical reaction, there are two techniques to determine the limiting reagent. Comparing the mole ratio of the reactants involved in a chemical reaction is one way. Comparing the masses of the reactants involved in a chemical reaction is another way. The limiting reagent is the one that reacts with a smaller amount of product.

Since, Ca(OH)2 is in the ratio 1:2 with HCl, which means for two moles of HCl, one mole of Ca(OH)2 is consumed which is required in smaller amount, Thus if Ca(OH)2 is present in less amount the reaction depend on its concentration and is limited by it. so ca(oh)2 is the limiting reagent.

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Environmental researchers have collected rain acidity data for several decades. They want to see if there is any evidence that attempts to reduce industrial pollution have produced a trend toward less acidic rainfall. They should display their data in a Time plot.

Acid Rain: What Is It?

Any type of precipitation that contains acidic elements, such as sulfuric or nitric acid, that falls to the ground from the atmosphere in wet or dry forms is referred to as acid rain, also known as acid deposition. Rain, snow, fog, hail, and even acidic dust might fall under this category.

Only one variable—the acidity level of the rainfall over a specific time period—will be present in the data used to create the plot or graph. But because the gbwre data is time-dependent, the plot is a time series. As a result, this is a two-dimensional univariate plot with time on the other axis and the acidity label Rainfall on the first. The time series plot is therefore the appropriate type of graph to use to illustrate this kind of data.

Questions:

Environmental researchers have collected rain acidity data for several decades. They want to see if there is any evidence that attempts to reduce industrial pollution have produced a trend toward less acidic rainfall. They should display their data in a(n)... a. Bar graph b. Time plot c. Histogram d. Box plot

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Answer:

Nitrogen is a chemical element with an atomic number of 7 (it has seven protons in its nucleus). Molecular nitrogen (N2) is a very common chemical compound in which two nitrogen atoms are tightly bound together. Molecular nitrogen is a colorless, odorless, tasteless, and inert gas at normal temperatures and pressures.

Explanation:

i had this quest before but it might be different 4 u tho.:)))))))

With seven protons in its nucleus, nitrogen has the atomic number 7 and is a chemical element.

Thus, Two nitrogen atoms are securely linked together to form the chemical molecule known as molecular nitrogen. At normal temperatures and pressures, molecular nitrogen is a colorless, odorless, tasteless, and inert gas.

Numerous different forms of contaminants contain atoms of nitrogen. Nitric oxide and nitrogen dioxide can be produced during high temperature combustion when nitrogen gas is present, as in car engines.

Both gases contribute to the creation of nitric acid, which is a component of acid rain, and peroxyacetyl nitrate (PAN), which is a key component of smog.

Thus, With seven protons in its nucleus, nitrogen has the atomic number 7 and is a chemical element.

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Norway is a Nordic nation in North-Western Europe that borders Sweden, Finland, and Russia. Due to its reputation for having an exceptionally cold winter season, it has grown to be a very famous tourist destination in Europe, yet more than half of its yearly tourists arrive during the milder months of May to August.

The lowest temperature ever recorded in Norway was -51.4°c on New Year's Day in 1886. Although temperatures and meteorological conditions around the world vary, Norway may experience some rather extreme lows. Norway has a variety of climatic characteristics that explain why it has the coldest climate in all of Europe. Here are a couple of them justifications.

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ph of 0.05M hydrochloric acid is 1.3 .

pH = -log10[H+] 

       = -log10[0.05] – log10[5 × 10-2] 

       = 2 – log5 

       = 2 – 0.6990  

       = 1.301

We already know that HCl is a powerful acid. As a result, it totally dissociates in an aqueous solution. As a result, the concentrations of H⁺ and HCl are the same. As a consequence, the pH of the aqueous solution of HCl is 1.31.

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Answer:

0.278m/s (3sf) OR 0.28m/s (2dp)

Explanation:

1km = 1000m

1h = 3600s (60mins x 60 secs)

1000m/3600s (simplify)

10m/36s (simplify by dividing both sides by 36)

(1/36)m/s OR 0.27777777777ms/s

Round up:

0.28m/s (2dp) or 0.278m/s (3sf)

We want to see what happens to the particle's speed in a given material as the temperature changes and it faces a change of phase.

We will see that the particles in the gas (vapor of water) have a larger speed than the ones in the liquid water.

As we increase the temperature of the material, the kinetic energy of the particles that make the material increase (thus the speed increases). This causes the particles to move more, and this is why as we increase the temperature, is likely to see an increase in the volume.

Then as we increase the temperature of liquid water and that water starts to change of phase (by boiling) the kinetic energy of the particles increase, and thus, the speed increases. then the particles will be moving faster than the particles of the water in the pan.

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Below is a diagram of the product's structure. The product is amide.

Aniline's N atom functions as a nucleophile, whereas propanoic acid's carbonyl group functions as an electrophilic center. A nucleophilic acyl substitution process takes place when aniline and propanoic acid are combined and heated. An amide is created during this reaction. At the carbonyl center, the reaction mechanism follows the addition-elimination pathway. The complete response mechanism is displayed here. An acyl group (R-C=O) joined to a nitrogen atom forms the functional group of an amide, which is typically an organic compound: The simplest amides are ammonia (NH3) derivatives with an acyl group in place of one hydrogen atom.

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The maximum wavelength of electromagnetic radiation which can ionize this atom is 320 nm or 320 x 10^-9 m.

The ionization energy is the minimum amount of energy that should be given to an element to eject electrons out of it i.e ionizing it.

The relation between Energy(E) and wavelength(λ) is as follows

E = hc/λ

Here h = Planck’s Constant = 6.626 x 10-34 J s

c = speed of light = 3 x 10^8 m/s

λ = wavelength of electromagnetic radiation

Putting the given values in the above equation

6.24 x 10^-19 J = 6.626 x 10^-34 x 3 x 10^8/ λ

λ = 320 x 10^-9 m.

Thus, the maximum wavelength of electromagnetic radiation which can ionize this atom is 320 nm or 320 x 10^-9 m.

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Compared to water, a carbonated soft drink with a pH of 3 is 10,000 times more acidic.

What is meant by acidic in nature?

Acids include different types of acids and vinegar; they differ from bases in that they have a lower pH. The Latin term acidus, which means "sour or harsh," is where the word acid, which originally meant "of the taste of vinegar," originates from.

Bases are compounds that can accept a proton, while acids are substances that can donate a proton.

The answer is 10,000 because every pH unit change makes something 10 times more acidic.

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According to the question, the heat of the reaction has been -22 kJ/mol where a negative sign illustrates the occurrence of the exothermic reaction.

The heat of reaction may be defined as the amount of energy that is significantly absorbed or liberated by the system in order to form the products. This is calculated on the basis of bond energies.

The energy constituent by each bond in the reactant has been the heat of the reactant, and the energy of the product has been the heat of the product.

The heat of the reaction can be calculated by the following formula:

The reactant molecules are [tex]CH_3OH[/tex] and C≡O.

The bond energy of the reactant is as follows:

[tex]H_r_e_a_c_t_a_n_t[/tex] = 3 × C-H + C-O + O-H + C≡O.
                = 3 × 413 + 358 + 467 + 1070

                = 3134 KJ/mol.

The product molecule has been [tex]CH_3COOH[/tex].

The bond energy of the product is as follows:

[tex]H_p_r_o_d_u_c_t[/tex] = 3 × C-H + C-O + O-H +C-C + C = O.

              = 3 × 413 + 358 + 467 + 347 + 745.

              = 3156 KJ/mol.

The heat of the overall reaction is as follows:

ΔH = [tex]H_r_e_a_c_t_a_n_t - H_p_r_o_d_u_c_t[/tex]

     = 3134 - 3156 = -22KJ/mol.

Therefore, the heat of the reaction has been -22 kJ/mol where a negative sign illustrates the occurrence of the exothermic reaction.

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