Acid - Concentration - pH
X - 0.005 M - 2.3
Y - 2.0 M - 2.8
Z - 3.0 M - 2.8
Which of the following correctly ranks the three monoprotic acids listed in the table above from the weakest to the strongest?

Answer:

10

Explanation:

Khan Academy

Answer:

This is a reversible change. Similarly, if you boil water, it evaporates and becomes water vapor. When you cool this vapor down, it turns back to water. A change which cannot happen backward, that is, it cannot be reversed is called an irreversible change.

Explanation:

When we boil water by heating, then it changes into steam. Now, if we cool the steam, then water is formed again. So, the changing of water into steam has been reversed by cooling. Thus, the boiling of water (or evaporation of water) is a reversible change.

Precipitates are insoluble ionic solid products of a reaction, formed when certain cations and anions combine in an aqueous solution. The determining factors of the formation of a precipitate can vary.

If an electron changes its orbit then energy will be emitted , and electron will emit a photon in this transition .

During transition the energy of an electron increases with n that is also known as the principal quantum number. Here, the electron is shifting  from a higher energy level (n=3 ) to a lower energy level (n=1 ). So, it will emit a photon during the process of transition .

Hence, energy of photon emitted corresponding to transition n = 3 to n = 1 is h = 6 × 10^-34 J - sec. Also when Hydrogen like ion, electron jumps from n = 3, to n = 1, it results in the release of photon with frequency 2.7 xx 10^(15)Hz.

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To determine the pH of a solution using a pH indicator paper, you need a color chart or a color scale that corresponds to different pH values.

This color chart or scale is used to compare the color of the pH indicator paper after it has been immersed in the solution. The pH indicator paper is impregnated with a universal pH indicator, which is a chemical compound that changes color depending on the acidity or alkalinity of the solution.

The indicator undergoes a chemical reaction with the hydrogen ions (H+) or hydroxide ions (OH-) present in the solution, resulting in a color change.

By comparing the color of the pH indicator paper with the color chart or scale, you can determine the approximate pH of the solution. The color chart usually provides a range of colors corresponding to different pH values, allowing you to match the observed color to the nearest pH value.

In the hypothesis mentioned, the aim is to calibrate a cabbage pH indicator using the pH values obtained from a universal pH indicator. Therefore, in addition to the pH indicator paper and color chart, you would also need a range of solutions with known pH values to establish a calibration curve specific to the cabbage pH indicator.

In summary, to determine the pH of a solution using a pH indicator paper, you need a color chart or scale that correlates the observed color of the pH indicator paper with different pH values. This chart or scale serves as a reference for interpreting the color change and determining the pH of the solution.

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Answer: COLOR KEY

Explanation: CS

Answer:

Get SNS

Explanation:

Answer:

The new volume of gas would be 30 L.

Explanation:

This is an example of a Combined Gas Laws problem.

In this question, we have two reactions, and we have to find the number of atoms of reactants and products involved in this reactions:

2 C2H6 + 7 O2 -> 4 CO2 + 6 H2O

In this case, we have

Reactants:

4 Carbons

12 Hydrogens

14 Oxygens

Since the reaction is balanced, the number of atoms on both reactants and products side are the same

P4O10 + 6 H2O -> 4 H3PO4

In this case, we have

Reactants:

4 Phosphorus

16 Oxygens

12 Hydrogens

Since the reaction is balanced, the number of atoms on both reactants and products side are the same

Answer:

Energy is carried from one point to another or from one region to another by moving mass or through the action of waves.

· All waves have a source.  This source transforms energy into forms that can be carried as waves.

· Waves are not material objects.  Waves represent the moving energy being carried away from the source.

Waves are coordinated vibrations that transport energy.  Sometimes waves require the vibration of particles in matter to move, other waves travel without any need for particle vibrations.

Explanation:

Wave energy requires no motion for its movement whereas matter energy requires motion. Wave energy travels in electromagnetic spectrum whereas this is not applicable to matter energy.

Wave energy is obtained from the water currents in the ocean and seas. The energy so harnessed is a renewable form of energy.

Wave energy is important as it provides enormous energy harvest. Waves have the high potential to generate energy on a mass scale. This energy can be utilized for energy production, water desalination etc. Special wave energy converters are available for this purpose.

Wave energy will reduce the dependence on fossils for energy. It can be considered as a reliable source to obtain energy using wave power. However, it is an expensive way and also requires high maintenance.

Wave energy is also weather dependent. As disturbances in the weather affect the energy production.

Thus, waves can be considered as an important source of renewable energy on earth.

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In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).

A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, an intermediate chemical equation is presented as follows:

As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.

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Answer:

1.2 × 10^22 atoms.

Explanation:

Firstly, cations refers to the positively charged atom in the ionic compound, which is Na+.

Given the mass of NaCl as 1.17g, the number of moles of NaCl can be calculated this:

Molar mass of NaCl = 23 + 35.5

= 58.5g/mol

Mole = mass/molar mass

Mole = 1.17/58.5

Mole = 0.02moles

Using Avagadro's number, 6.022 × 10^23 atoms of Na+ are in 1 mole of NaCl.

In 0.02 moles of NaCl, there are 0.02 × 6.022 × 10^23 of Na+

0.1204 × 10^23 atoms

1.2 × 10^22 atoms of Na+ (cation)

Answer:

about 12 cm

Explanation:

Considering the frequency of 2,450 MHz, the wavelength of microwave oven radiation is about 12 cm and the quantum energy of a microwave photon is about 1 x 10-5 eV.

Answer:  An isolated system is a thermodynamic system that cannot exchange either energy or matter outside the boundaries of the system.

Explanation:

Addition reactions are chemical reactions in which one bond is broken, and two new bonds are formed.

They are the inverse of elimination reactions, where two bonds are broken to form a new bond and eliminate a small molecule. In an addition reaction, a reactant molecule adds to a substrate molecule, resulting in the formation of a larger product molecule.

This process often occurs in organic chemistry, where functional groups or atoms are added to unsaturated compounds, such as alkenes or alkynes. Addition reactions play a crucial role in the synthesis of complex molecules and the modification of chemical structures, enabling the creation of diverse and intricate compounds.

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The approximate atomic radius of nickel is 1.532 × 10^(-8) cm.

In a cubic unit cell, the body diagonal length (diagonal that passes through the center of the unit cell) is equal to four times the atomic radius (4r). We can use this relationship to find the atomic radius of nickel.

Given: Edge length of the unit cell (a) = 3.524 × 10^(-8) cm

The body diagonal length is given by:

Diagonal length (d) = a√3

Substituting the given values:

d = (3.524 × 10^(-8) cm) × √3

Now, we can calculate the atomic radius (r) by dividing the diagonal length by 4:

r = d / 4

Performing the calculations:

r = [(3.524 × 10^(-8) cm) × √3] / 4

r ≈ (3.524 × 10^(-8) cm) × (1.732 / 4)

r ≈ 1.532 × 10^(-8) cm

Therefore, the approximate atomic radius of nickel is 1.532 × 10^(-8) cm.

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Transferring electrons from one species to another is a key component of redox reactions. A shift in oxidation number is the outcome of this. Working with metals may cause both electrodes to alter mass. The electrolytic solution's anions serve as a conduit for the passage of metallic ions to the cathode. The gas evolved from non-metals (gases) is gathered in a container. As a result, the mass of the negative electrode may fluctuate.

Based on the idea that metals precipitate out in their elemental form on solid electrodes when potential or electricity is imparted to them, electrochemical procedures extract and recover heavy metals. When there is an electron flow across the circuit from the anode, the fundamental reaction taking place is the reduction of metals in various oxidation states into a zero oxidation state (elemental state of metal) at the cathode (Nancharaiah et al., 2015). Based on how they work, these reductions can be divided into three categories: electrodeposition, electroflotation, and electrocoagulation. In EC, coagulating ions are released from the electrodes and react with the metals. These coagulates can then be sorted using centrifugation (Chen, 2004).

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In any chemical reaction, the mass of the products must equal the mass of the reactants. The mass of product B is the same as the combined mass of Reactant A and H₂O.

Answer:

sh5barch shougi

Explanation:

You'll have 20.5 g of hydrochloric acid (HCl) left, which is the answer to your query.

Data

HCl = 31.4 g

NaOH = 12 g

insufficient HCl =?

equilibrium in a chemical reaction

NaCl and H2O are produced from HCl and NaOH.

HCl's molar mass is equal to 1 + 35.5 = 36.5 g.

NaOH's molar mass is 40 g (23 + 16 + 1)

Figure out the limiting reactant.

Theoretical yield: 36.5/40 = 0.9125 for HCl/NaOH.

Research yield: HCl/NaOH = 31.4/12 = 2.62

Conclusion

Because of the increasing experimental yield, NaOH is the limiting reactant.

The excess reactant's mass should be determined.

35. 5 g of HCl ———————— NaOH weight 40 g

x ———————— NaOH in 12 g

x = (12 x 36.5) / 40

x = 438 / 40

x = 10.95 grams of HCl

Surplus HCl = 31.4 - 10.95

= 20.5 g

You'll have 20.5 g of HCl left, which is the answer to your query.

The complete question is,

To create aqueous sodium chloride and liquid water, aqueous hydrochloric acid must be combined with solid sodium hydroxide. Consider combining 12.g of sodium hydroxide with 31.4g of hydrochloric acid. Determine the smallest amount of hydrochloric acid that could possibly remain after the reaction. The quantity of significant digits in your response must be accurate.

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Large particles usually get smaller as a result of surface reactions. Both heating and freezing effects of tiny particles on the climate are seen.

Weathering can be classified as either physical or chemical. There is a wide variety in soil particle size due to variations in weathering processes.The overall surface area increases when the size is reduced more. This is significant since most chemical changes start at an object's surface.

The Earth's materials are the four major elements that make up the earth's crust. The earth is made up of minerals, rocks, soil, and water. Earth materials include the necessary building components for life, agriculture, and industry.

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To find the number of moles represented by a certain number of particles, you can use Avogadro's number and the concept of molar mass.

Avogadro's number (symbolized as N_A) is a fundamental constant that represents the number of particles (atoms, molecules, ions, etc.) in one mole of a substance. It is approximately equal to 6.022 × 10²³ particles/mole.

Molar mass is the mass of one mole of a substance and is expressed in grams/mole. It represents the sum of the atomic masses or molecular masses of the constituent particles in a substance.

To calculate the number of moles, you can follow these steps;

Determine the number of particles you have (atoms, molecules, ions, etc.).

Identify the molar mass of the substance or the average molar mass if it's a mixture.

Divide the number of particles by Avogadro's number to convert them into moles. The formula is:

Moles = Number of Particles / Avogadro's number

Moles = Number of Particles / (6.022 ×10²³ particles/mole)

The result will give you the number of moles represented by the given number of particles.

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--The given question is incorrect, the correct question is

"Explain how you would find the number of moles that are represented by a certain number of representative particles."--

Answer:

Follows are the solution to this question:

Explanation:

The characterization with water molecules would be that light waves are made up of 2 different types of atoms (2 hydrogen and 1 oxygen atoms), as per the Dalton theory. There are many multiple times as many atoms of hydrogen as oxygen atoms in each water molecules. For every two hydrogen atoms, all water molecules have one oxygen atom.

Answer:

Sample Response: Dalton’s theory about compounds tells us that all water molecules have different kinds of atoms, two hydrogen atoms for every one oxygen atom.

Explanation:

Answer:

b.location in the sky (If the question is saying:The H-R diagram is useful in

studying all of these about a star except for)

Explanation:

The theoretical HR diagram plots the temperature of the star vs their luminosity (brightness) and the observational HR diagram plots color of the stars vs the absolute magnitude. Depending on mass, stars will also go through specific evolutionary stages that can be seen through the location of the star on the HR diagram. However, the HR diagram will not have data on the location of the star in the sky.

The final concentration of the complex ion tetraamminecopper(II) ([Cu(NH3)4]2+) is 0.4 M.

To determine the final concentration of the complex ion tetraamminecopper(II) ([Cu(NH3)4]2+), we need to consider the stoichiometry of the reaction between CuS and NH3.

The balanced chemical equation for the reaction between CuS and NH3 is: CuS + 4NH3 → [Cu(NH3)4]2+ + S2-

According to the balanced equation, one mole of CuS reacts with four moles of NH3 to form one mole of [Cu(NH3)4]2+ complex ion.

Initial volume of NH3 = 1.00 L

Initial concentration of NH3 = 1.00 M

Initial moles of NH3 = Initial concentration * Initial volume = 1.00 M * 1.00 L = 1.00 mol

After the reaction, 0.4 mol of NH3 has reacted to form the [Cu(NH3)4]2+ complex ion.

Final moles of NH3 = Initial moles - Moles of NH3 reacted = 1.00 mol - 0.4 mol = 0.6 mol

Final volume of NH3 remains the same at 1.00 L.

The final concentration of [Cu(NH3)4]2+ can be calculated as:

Final concentration= Final moles / Final volume = 0.4 mol / 1.00 L = 0.4 M

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Answer:

Ernest Rutherford and Frederick Soddy were the radiochemist who explained radioactivity.

Together, Rutherford and Soddy discovered that radioactivity involved the spontaneous breakdown of atoms into smaller, more stable particles. Their work laid the foundation for many subsequent advancements in nuclear science.

Explanation:

Ernest Rutherford was a renowned New Zealand physicist and chemist who made significant contributions to the study of atomic structure and radioactivity.

He is often referred to as the "Father of nuclear physics".

Riding that wave of astounding discoveries, Rutherford rose to prominence as the forerunner of a new wave of British Empire explorers who preferred to explore the atom rather than get lost in the vastness of a continent. Rutherford used radioactivity, not a compass or a map, to provide a clear picture of what the atom looks like.

Frederick Soddy was a British chemist and radiochemist who worked alongside Rutherford and helped to develop the theory of isotopes.

Soddy was extremely concerned about how scientific advancements were being used. Soddy was among the first to criticise economic growth based on the use of fossil fuels for energy production, claiming that the system conflates riches with debt. At the time, his now-commonplace recommendations for overhauling the monetary system were neglected and disregarded due to their perception as unorthodox.

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F-18 has a biological half-life of about 6 hours and a physical half-life of 1.83 hours, making its active half-life roughly 1.4 hours (7). Fluorine F 18 has a half-life is 109.7 minutes and decays by positron,(+) emission.

Positrons are released by this fluorine radioactive isotope. A radioactive version of glucose that's also easily absorbed by cancer cells as well as normal cells can be created using F-18. Nuclear imaging can be used to locate tumours, map brain activity, and identify other diseases.

A key source of positrons is the fluorine radioisotope fluorine-18 (18F). Its half-life was 109.771(20) minutes, and its mass is 18.0009380(6) u. 96% of the time, it decays via positron emission, and 4% by electron capture.

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Answer:The pOH of the solution is 9.914

Explanation:

pH is given as the negative logarithm (base 10) of the hydronium ion concentration [H₃O⁺] that is

pH= - log [H₃O⁺]

Since we are given  [H₃O⁺]=8.2 x 10⁻⁵,

pH=- log (8.2 x 10⁻⁵)

pH= 4.086

The pOH gives s the measurement of the concentration of OH− ions, Hence,

pH + pOH= 14

from the above calculation, we got  pH=4.086

So

4.086 + pOH=14

pOH= 14 - 4.086

pOH= 9.914

The pOH of the solution is 9.914

The balanced chemical reaction equation is;

2Ca(OH)2(aq)+H2SO4(aq)—→ CaSO4(s)+2H2O(l)

The symbolic representation of a chemical reaction is a chemical equation. To describe the reactants, products, and associated quantities involved in a chemical reaction, chemical formulae and symbols are used. The equation illustrates how chemical reactions can change one or more compounds (reactants) into new substances (products).

The direction of the reaction is shown by an arrow connecting the reactants and products, which is often pointing from left to right. The arrow could either "reacts to form" or "yields."

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