Fill in the coefficients that will balance the following:
_____Fe(HCO3)3+ _____CaO------> Fe2O3+_____Ca(HCO3)2

Answer:

1) Evaporation

Explanation: It would be evaporation because it requires water to gain 2,260 J/g.

The graphite and talc minerals are softer than a human fingernail. Therefore, option (3) is correct.

The hardness of a mineral measures its relative resistance to scratching,  by scratching the mineral against another substance whose hardness is known on the Mohs Hardness Scale.

The Mohs scale of mineral hardness is characterizing the scratch resistance of several minerals by measuring the ability of harder material to scratch softer material.

This method is useful for the identification of minerals in the field because we can test minerals against some common objects such as fingernails, pence, nails, etc. The scale is named behind the name of its creator the German mineralogist Friedrich Mohs.

The hardness of the fingernail is 2.5 while the hardness of the talc is 1 and the hardness of the graphite lies between 1 to 2. Therefore, graphite and talc are minerals that are softer than a human fingernail.

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Final answer:

The electron configurations for the elements with atomic numbers 15, 12, 9, and 18 are 1s²2s²2p¶3s²3p³ for Phosphorus, 1s²2s²2p¶3s² for Magnesium, 1s²2s²2pµ for Fluorine, and 1s²2s²2p¶3s²3p¶ for Argon, respectively.

Explanation:

The electron configuration of an element details the distribution of electrons in the atom's shells and subshells based on the principles of quantum mechanics. We'll list the electron configurations for various elements based on their atomic numbers.

These configurations were determined using the principles of the Aufbau principle, Hund's rule, and the Pauli exclusion principle.

Staples and metal shavings are types of Staples and metal shavings are types of physical hazards.

These are the types of hazards that can be possible by some contamination such as metal shavings getting into food staples are also a form of physical hazard caused by foreign contamination also.

It is a type of hazard which cause pain and harm to the human body and animals too.

They can be caused by food too like the small metal pieces that can enter our system through the food and goes to our alimentary canal as they cannot be digested and cause major infection in the human body. Which can also affect the immune system of the body

They get entry to the food pipe goes into the small intestine and large intestine as they interfere with the metabolism of the digestive system and cause  many more problems

They affect the biochemical reactions of the body like protein synthesis and all of which can lead to loss of motion and many infectious diseases

Therefore, is it a  physical hazard

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It will be B.reproducing because it is reproducing a new cell.

Increasing the temperature of a gas proportionally raises the average kinetic energy of the gas's molecules. With this increase, molecules move faster, indicating higher kinetic energy, resulting in a shift in kinetic energy distribution toward higher speeds overall.

When the temperature of a gas sample is increased, as mentioned, from 20ºc to 40ºc, there are some noticeable effects on the behavior of the molecular activity within the gas. The most notable effect is on the average kinetic energy of the gas molecules. According to kinetic-molecular theory, the temperature of a substance is proportional to the average kinetic energy of its particles. Hence, as the temperature increases, so does the average kinetic energy.

At higher temperatures, the distribution of kinetic energies among the atoms or molecules of the gas is broader than at lower temperatures. In more straightforward terms, molecules are moving more rapidly and have higher speeds at an increased temperature, indicating more kinetic energy. This shift in kinetic energy leads to a shift in the distribution toward higher speeds overall. So, when the gas's temperature has increased from 20ºC to 40ºC, the molecules' average kinetic energy has also subsequently increased.

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The presence of sodium carbonate can be identified by adding some sulphuric acid. The carbonates will produce carbon dioxide and it can be identified by the brisk effervescence.

Sodium carbonate is an inorganic compound formed from the sodium metal and carbonate ions. It is basic in nature due to the presence of electron  rich carbonate anion.

Sodium carbonate will reacts with acids and neutralise them to form salts. It is a weak acid and thus ionization and conductivity of its electrolyte are weak.

Sodium carbonate react with sulphuric acid gives carbon dioxide, water and sodium sulphate. The carbon dioxide formed there will evolves as gas and produce brisk effervescence.

Therefore, by the  brisk effervescence formed in the reaction we can identify the presence of sodium carbonate in the mixture.

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Enteropeptidase is a chemical that activates the transformation of trypsinogen to trypsin.

In biology and chemistry, activation refers to the process of preparing or energising something in preparation for a future reaction. The term "activation" in chemistry describes the reversible transformation of a molecule to a chemical and physical state that is essentially identical to the original state, with the distinguishing feature that the new state demonstrates a greater tendency to undertake a certain chemical reaction. Therefore, conceptually speaking, activation is the reverse of protection, where the resultant state shows a lower tendency to conduct a certain reaction. Enteropeptidase is a chemical that activates the transformation of trypsinogen to trypsin.

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A pH of 10 is 1,000 times more basic than a pH of 7 because the pH scale is logarithmic, and for every point increase, the solution becomes 10 times more basic.

In chemistry, pH is a scale used to specify the acidity or basicity of an aqueous solution. A pH of 7 is neutral, any value above 7 is considered basic or alkaline, and any value below 7 is considered acidic. The pH scale is logarithmic and as a result, every point increase means the solution is 10 times more basic. So, a pH of 10 is 1,000 times more basic than a pH of 7 (10^3, since 10-7 equals 3).

Neutral pH: A pH value of 7 is regarded as neutral. This signifies that the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in the solution is equal, resulting in a balanced state.

Acidic Solutions: Solutions with a pH below 7 are classified as acidic. The lower the pH value, the higher the concentration of hydrogen ions. These solutions tend to have a surplus of H+ ions, making them proton-rich and acidic.

Basic or Alkaline Solutions: Solutions with a pH above 7 are considered basic or alkaline. In such solutions, the concentration of hydroxide ions (OH-) surpasses that of hydrogen ions. These solutions are proton-poor and exhibit alkaline characteristics.

Logarithmic Nature: The pH scale is logarithmic, which implies that each unit change on the scale represents a tenfold difference in the concentration of hydrogen ions. For instance, a solution with a pH of 10 is 10 times more basic than a solution with a pH of 9, and 100 times more basic than a solution with a pH of 8.

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To express 87,449 in scientific notation with four significant figures, it's written as 8.745 × 104. The number 0.000066600 in scientific notation with five significant figures is expressed as 6.6600 × 10-5.

To express the number 87,449 in scientific notation with four significant figures, you need to place the decimal after the first digit and count the number of places you move it. In this case, the decimal is moved 4 places to the left: 8.7449 becomes 8.744. Now, we need just four significant figures, so it rounds to 8.745. This gives us 8.745 × 10 to the power of 4, or 8.745 × 104.

Writing the number 0.000066600 in scientific notation with five significant figures involves moving the decimal point 5 places to the right, giving us 6.6600 which rounds to 6.6600 with five significant figures. This becomes 6.6600 × 10 to the negative fifth power, or 6.6600 × 10-5.

The pH of 0.025 M [OH-] solution would be 12.4

The pH is the degree of acidity or alkalinity of a substance.

Mathematically,

pH = 14 - pOH

pH = -log [H+]

pOH = -log [OH-]

In this case, [OH-] = 0.025 M

Thus

pOH = -log [OH-]

           = -log 0.025

              = 1.6

pH = 14 - 1.6

       = 12.4

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Among the elements listed, potassium (K) would have the lowest first ionization energy.

The element with the lowest first ionization energy is potassium (K). In general, elements in group 1A of the periodic table, also known as alkali metals, have the lowest first ionization energies.

This is due to their electron configuration, which features a single valence electron in the outermost shell, held relatively loosely due to the shielding effect of inner electrons and the large atomic size.

As a result, it requires less energy to remove this outer electron compared to other elements. Potassium, located in group 1A, has an atomic number of 19 and exhibits this characteristic exceptionally well.

Therefore, among the elements listed, potassium (K) would have the lowest first ionization energy.

Complete question :-

Which element has the lowest first ionization energy?
a) As
b) P
c) K
d) Bi
e) Sb

"The correct answer is d. An alpha particle consists of two protons and two neutrons.

An alpha particle is a type of ionizing radiation that is emitted from the nucleus of an atom during radioactive decay. It is composed of two protons and two neutrons, which means it has a charge of +2 due to the two protons. This configuration is equivalent to the nucleus of a helium-4 atom, making an alpha particle essentially a helium nucleus.

 To clarify the other options:

a. A particle consisting of a positively charged electron does not exist as described. Electrons are negatively charged, and a positron is the antiparticle of an electron, which has a positive charge. However, an alpha particle does not contain electrons.

b. A particle consisting of one proton and two neutrons is not an alpha particle. This combination would not have a charge of +2, as the alpha particle does.

 c. A particle consisting of two protons and two electrons would not be stable. The two electrons would neutralize the charge of the two protons, and this combination does not represent an alpha particle.

Therefore, the only correct option is d, which states that an alpha particle consists of two protons and two neutrons."

Hydrogen bonds between water molecules are broken when ice melts as a result of increased kinetic energy of the water molecules, which comes with increased temperature. As the water molecules move past each other, the hydrogen bonds are naturally broken. Conversely, these bonds remain intact as water freezes, contributing to the less dense nature of ice compared to liquid water.

In the process of ice melting, the hydrogen bonds between water molecules are broken due to the kinetic energy of the water molecules, which increases as the temperature increases. The water molecules move and slide past each other, causing the bonds to break.

Hydrogen bonds regularly form and break in liquid water, but when the temperature drops and water freezes, a crystalline structure is formed, which is maintained by hydrogen bonding as there is not enough energy to break these bonds. This characteristic makes ice less dense than liquid water, an unusual property when compared to other liquids.

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The decreasing order of elements of the number of valence electrons is as follows:

[tex]\boxed{{\text{Kr}}={\text{Ar}}>{\text{Br}}={\text{Cl}}={\text{F}}>{\text{O}}>{\text{As}}={\text{Sb}}>{\text{Si}}>{\text{Al}}>{\text{Ca}}={\text{Ba}}={\text{Sr}}>{\text{Li}}>{\text{Na}}}[/tex]

Further explanation:

The electronic configuration is the distribution of electrons of an atom in the atomic orbitals. There are two states for an electron: ground as well as the excited state. The configuration of the atom in the lowest possible energy levels is called the ground-state electronic configuration. When an electron jumps from the stable ground state to some higher level, that state is called the excited state and the electronic configuration corresponding to this state is known as the excited-state half-filled configuration.

The filling of electrons in different energy levels or orbitals is done in accordance with the following three rules.

1. Aufbau principle: The principle states that the electrons are filled in various orbitals in the increasing order of their energies as follows:

[tex]1s<2s<2p<3s<3p<4s<3d<4p<5s<4d<5p<6s<4f<5d<6p<7s<5f<6d<7p[/tex]

2. Hund’s rule: Electron pairing will not start until each orbital is singly occupied.

3. Pauli’s exclusion principle: According to this principle, all the four quantum numbers [tex]\left({n,\;l,\;{m_l},\;{m_s}}\right)[/tex] for any two electrons can never be the same. In an orbital, the spin of two electrons has to be different. If one electron has the clockwise spin, the other would have the anticlockwise spin and vice-versa.

The atomic number of Kr is 36. Its electronic configuration is [tex]\left[{{\text{Ar}}}\right]\;3{d^{10}}4{s^2}4{p^6}[/tex]. So it has 8 valence electrons.

The atomic number of Ca is 20. Its electronic configuration is [tex]\left[{{\text{Ar}}}\right]4{s^2}[/tex]. So it has 2 valence electrons.

The atomic number of Ba is 56. Its electronic configuration is [tex]\left[{{\text{Xe}}}\right]6{s^2}[/tex]. So it has 2 valence electrons.

The atomic number of Br is 35. Its electronic configuration is [tex]\left[{{\text{Ar}}}\right]\;3{d^{10}}4{s^2}4{p^5}[/tex]. So it has 7 valence electrons.

The atomic number of Li is 3. Its electronic configuration is [tex]1{s^2}2{s^1}[/tex]. So it has 1 valence electron.

The atomic number of F is 9. Its electronic configuration is [tex]\left[{{\text{He}}}\right]\;2{s^2}2{p^5}[/tex]. So it has 7 valence electrons.

The atomic number of As is 33. Its electronic configuration is [tex]\left[{{\text{Ar}}}\right]\;3{d^{10}}4{s^2}4{p^3}[/tex]. So it has 5 valence electrons.

The atomic number of Sb is 51. Its electronic configuration is [tex]\left[{{\text{Kr}}}\right]\;4{d^{10}}5{s^2}5{p^3}[/tex]. So it has 5 valence electrons.

The atomic number of O is 8. Its electronic configuration is [tex]\left[{{\text{He}}}\right]\;2{s^2}2{p^4}[/tex]. So it has 6 valence electrons.

The atomic number of Al is 13. Its electronic configuration is [tex]\left[{{\text{Ne}}}\right]\;3{s^2}3{p^1}[/tex]. So it has 3 valence electrons.

The atomic number of Cl is 17. Its electronic configuration is [tex]\left[{{\text{Ne}}}\right]\;3{s^2}3{p^5}[/tex]. So it has 7 valence electrons.

The atomic number of Si is 14. Its electronic configuration is [tex]\left[{{\text{Ne}}}\right]\;3{s^2}3{p^2}[/tex]. So it has 7 valence electrons.

The atomic number of Na is 11. Its electronic configuration is [tex]\left[{{\text{Ne}}}\right]\;3{s^1}[/tex]. So it has 1 valence electron.

The atomic number of Ar is 18. Its electronic configuration is [tex]\left[{{\text{Ne}}}\right]\;3{s^2}3{p^6}[/tex]. So it has 8 valence electrons.

The atomic number of Sr is 38. Its electronic configuration is [tex]\left[{{\text{Kr}}}\right]\;5{s^2}[/tex]. So it has 2 valence electrons.

So the decreasing order of elements of the number of valence electrons is as follows:

[tex]{\text{Kr}}={\text{Ar}}>{\text{Br}}={\text{Cl}}={\text{F}}>{\text{O}}>{\text{As}}={\text{Sb}}>{\text{Si}}>{\text{Al}}>{\text{Ca}}={\text{Ba}}={\text{Sr}}>{\text{Li}}>{\text{Na}}[/tex]

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1. Determine the ion with configuration [tex]\left[{{\text{Ar}}}\right]\;3{d^2}[/tex]: https://brainly.com/question/7599542

2. Identification of element which has electron configuration [tex]1{s^2}2{s^2}2{p^2}3{s^1}[/tex]:https://brainly.com/question/9616334

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Electronic configuration of the elements

Keywords: electronic configuration, valence electrons, decreasing order, Kr, Ar, Cl, Br, F, O, As, Sb, Si, Al, Ca, Ba, Sr, Li, Na, 8, 7, 6, 5, 4, 3, 2, 1, Aufbau, Hund’s rule, Pauli’s exclusion principle.

The elements are ranked by their number of valence electrons from most to least as follows: F, Cl, Br, O, Sb, As, Kr, Ar, Si, Al, Na, Li, Ca, Sr, Ba.

The elements can be arranged according to their number of valence electrons (the electrons on the outermost shell of an atom) as follows. Starting with elements having the most valence electrons: F, Cl, Br, O, Sb, As, Kr, Ar, Si, Al, Na, Li, Ca, Sr, Ba.

To explain further, elements in Group 17 (F, Cl, and Br) have 7 valence electrons, Group 16 element (O) has 6, Group 15 elements (Sb, As) have 5, noble gases (Kr, Ar) have 8 (fully-filled), Group 14 element (Si) has 4, Group 13 (Al) has 3, Group 1 elements (Na, Li) have 1, and Group 2 elements (Ca, Sr, Ba) have 2 valence electrons.

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