Answer:
its B
Explanation:
i did the test yesterday
The configuration for the selenium subatomic particle with the maximum energy content is 4 s 2 followed by 4 p 4 point.
Explain electron configuration of selenium.
For selenium, the fundamental notation is [Ar]3d104s24p4. It has a Lewis structure. Due to the fact that they are not in the outer shell, which is the primary energy level 4, the ten 3d electrons of selenium are not visible. Selenium is paramagnetic because it possesses two unpaired electrons in the 4p-orbital.
Tellurium and polonium are also members of the sulfur family, which includes selenium. This family's outermost shell has six electrons. The electron configuration of selenium particularly is 2-8-18-6. Selenium can have a range of valence values thanks to the six electrons in its outermost shell.
Two electrons are present in the selenium atom's filled "4s" subshell. A "3d" subshell filled with 10 electrons. A "4p" subshell with four empty electrons. Selenium has an atomic number of 34. Thus, it possesses 34 electrons in total. With 6 valence electrons, the Se element needs 2 additional electrons to become stable, or we may say to complete its octet. Se's ion has a +2 charge as a result.
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if an equal number of moles of the weak acid hcooh and the strong base lioh are added to water, is the resulting solution acidic, basic, or neutral?
If an equal number of moles of the weak acid HCOOH and the strong base LiOH are added to water the resulting solution will be basic.
Take titration of a weak acid with a strong base as an example. Only a mild acid is present at the beginning. With the weak acid, the concentration of H₃O⁺ is in balance. If a strong base is added to the weak acid will give up its H⁺ in order to transform the base (OH-) into water (H₂O) and the conjugate base: HA + OH⁻ → A⁻+ H₂O. Since the added OH⁻ is consumed by this reaction, the pH will change to more basic.
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What is the molarity of a solution made by dissolving 2.25 mol KOH in enough water to make 8.0 L of solution?
Answer:
-Molarity is defined as moles of solute divided by liters of solution and has units of mol/L. To get this answer, you just divide the number of moles by the volume in liters: 2.5 mol/195L = 0.013 M. I think
Explanation:
Answer: 0.28125
Explanation:
What is the molality of a solution that contains 0.625 g of argon dissolved in 150 g of water?
The molality of a solution that contains 0.625 g of argon dissolved in 150 g of water is 0.1 moles/ kg
One approach to express the concentration of a solute in a solution is by molality. The unit of measurement is kilograms of solvent divided by moles of solute. We must convert the mass of the solute into moles and divide it by the mass of the solvent in order to determine the molality of the given solution.
Since
the water weighs 150.0 grams.
But first, the moles should be determined.
moles= mass/ mass molar
moles = 0.625 g/ 39.948 g/ moles
= 0.0156 moles.
molality = moles / kg
molality = 0.015 moles/ 0.15 kg
molality = 0.1 moles/ kg
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which sequence represents a correct order of historical developments leading to the modern model of the atom
The modern model of the atom are Discovery of the electron, Rutherford's atomic model, Bohr's atomic model, and the development of quantum mechanics.
What is the modern model of the atom? The modern model of the atom consists of three main components; a nucleus, which contains protons and neutrons, and a cloud of electrons that orbit the nucleus. The protons and neutrons in the nucleus are held together by a strong nuclear force. The electrons are held in orbit around the nucleus by the electromagnetic force. The number of protons in the nucleus determines the type of atom. For example, a hydrogen atom has one proton, while a carbon atom has six protons. The number of neutrons can vary, but the total number of protons and neutrons must equal the atomic mass. The electrons are arranged in shells around the nucleus, with each shell having a specific number of electrons. The number of shells and the arrangement of electrons determines the chemical properties of the atom. The modern model of the atom allows for a better understanding of how atoms interact with each other to form molecules, which are the basis of all matter.To learn more about model of atom refer to:
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why do electrons go into the 4s orbital before the 3d orbitals?
Answer:
so so soon deep see see second
Explanation:
hail also
A solution is prepared by diluting 135. 0 ml of a physiological saline solution(0. 920% NaCl by weight) with 250. 0 mL of water. What is the osmotic pressure of the final solution at 37. 0 degree celsius? Assume that NaCl dissociates completely into Na+ and Cl-. Assume thedensity of the solution is the same as the density of water
Osmotic pressure of the final solution will be 2.99 atm when A solution is prepared by diluting 135. 0 ml of a physiological saline solution(0. 920% NaCl by weight) with 250. 0 mL of water.
We are given that 135 mL of 0.920% NaCl (by weight) solution is added to 225 mL of water
Mass of NaCl = (0.920*135)/100 = 1.242 g
Molar mass of NaCl is 58.44 g
Moles of NaCl = given mass / molar mass = 1.242/58.44 = 0.0212 mol
Total Volume of the solution = 135+225 = 360 mL
Volume of Solution (in L) = (360 mL/1000 mL)*1 L = 0.360 L
Concentration of NaCl = number of moles / Total volume of solution = 0.0212/0.360 = 0.0588 mol/L
Now, Osmotic pressure = i*c*R*T
here i is van't Hoff factor, c is molar concentration, R is gas constant, value of R is 0.0821 L.atm/mol.K, T is temperature
It is given NaCl dissociates completely into Na+ and Cl- so van't Hoff factor is equal to 2, temperature is given 37°C (310 K)
Osmotic Pressure = 2*0.0588*0.0821*310 = 2.99 atm
Therefore, osmotic pressure of the final solution will be 2.99 atm
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What is 6.022 x10 23 called?
6.022 * [tex]10^{23}[/tex] is called Avogadro's number. It is also called Avogadro's constant.
Avogadro's constant is the proportionality factor that relates the number of constituent particles in a sample with the amount of substance in the given sample. The exact value of Avogadro's number is 6.02214076×[tex]10^{23}[/tex]. It is the number of entities in a mole of any substance. Moles are based on the Avogadro's number. The number of moles of the system can be determined using the atomic mass of an element. That can be found on the periodic table. mass is an average of the abundant forms of that element found on earth. The mass of one mole of substance is called the molar mass of that substance. This all related to Avogadro's constant.
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What amount of carbon dioxide is produced by the reaction of 1 mole of ch4?
The amount of carbon dioxide , CO₂ is produced by the reaction of the 1 mole of the methane CH₄ is 44 g.
The reaction is given as :
CH₄ + 2O₂ ----> CO₂ + 2H₂O
The moles of the methane , CH₄ = 1 mol
The moles is given as :
The number of the moles = mass / molar mass
1 mole of the CH₄ produce the 1 mole of the CO₂
The moles of the CO₂ = 1 mole
The mass of the carbon dioxide , CO₂ = moles × molar mass
The molar mass of CO₂ = 44 g/mol
The mass = 1 × 44
= 44 g.
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What are the non-renewable energy sources of energy Mcq?
One category of non-renewable energy sources is natural gas.
The fact that we currently rely on these resources to meet the majority of our energy needs makes the fact that they cannot be replaced once they are depleted a serious issue for humanity. There are no renewable energy sources like natural gas. It takes millions of years for a fossil fuel to form. We can only produce more until a finite amount of it remains in the earth. Because it comes from sources that were created over millions of years by the action of heat and pressure on organic materials, the vast majority of natural gas in the United States is classified as a fossil fuel.
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Land, Labor, Capital, Entrepreneurship, Knowledge. what are the five factors of production?
Land, labor, capital, entrepreneurship, and knowledge make up the five components of production.
Land, labor, entrepreneurship, and capital are examples of the components of production, which are the inputs needed to generate a good or service.
The owners of the major production factors are typically the richest people in a society. In capitalism, the factors affecting production are frequently under the authority of firm owners and investors. In socialist systems, the state (or community) frequently has greater control over the inputs necessary for production.
Land is a broad concept that refers to both agricultural land and other sorts of land resources, such commercial real estate. Natural resources like oil and gold can be extracted from the ground and made fit for human consumption.
Labor is the effort put forth by a person to market an item or service. It can appear in numerous ways, once more. Workers who work on a hotel's construction site include, for example, the waiter who serves clients or the receptionist who registers them.
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PLEASE HELPP !!
At what group # does the ionic radius suddenly increase dramatically from the lowest to the highest? Why?
Atomic and ionic radii in any group get larger as you descend from top to bottom. This is because more main shells are added as the atomic number rises.
What causes ionic radius to increase?This change in size (i.e., radius) that occurs when an atom acquires or loses its outermost electron is known as the ionic radius (s). If an atom gets another electron, it transforms into the negatively charged anion known as an anion, which has a larger ionic radius.Because valance electrons are added to the same energy level at the same time that the nucleus's protons are rising, the atomic radius shrinks over time. The stronger attraction between the electrons and the nucleus caused by the rise in nuclear charge.On the periodic table, the atomic radius grows as the number of energy levels in the elements rises from top to bottom.To learn more about ionic refer to:
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Predict the product(s) of this reaction: (Don't worry about balancing)
Zn(NO3)2 + NaOH -->
Explanation:
zn(NO3)2+2NaOH....zn(OH)2+2NaNO3
Use compound type to infer the relative boiling points of the following compounds: NaF, N2O and, H2O rank them in order from lowest to highest boiling point. Explain how you made your ranking. Then look up the boiling points and check your answer.
Answer:
H2O: 100°C
N2O: -88.5°C
NaF: 1414°C
Explanation:
H2O is a covalent molecule with strong hydrogen bonds between its molecules, giving it a high boiling point.
N2O - Because N2O has a weaker intermolecular force than H2O, it has a lower boiling point.
NaF is an ionic compound with no covalent bonds, only electrostatic forces between its ions, and thus has the lowest boiling point of the three.
These compounds' boiling points are:
H2O: 100°C
N2O: -88.5°C
NaF: 1414°C
Answer:i forgor
Explanation:i dont remember
How does potassium react with oxygen?
Potassium reacts with oxygen to form potassium oxide (K2O). The reaction is exothermic, releasing heat energy.
The chemical element potassium has the atomic number 19 and the letter K (which stands for kalium in Neo-Latin). It is a silvery-white metal that may be easily sliced with a knife using only a little pressure. A range of foods, including fruits and vegetables, contain potassium, a mineral that is crucial for human health. It contributes to maintaining a healthy fluid balance, healthy muscles and nerves, and a strong heart. A number of symptoms, such as muscle weakness and cramping, can result from deficiency. Although potassium supplements are readily available, it is typically advised to obtain potassium through a healthy diet. The reaction can be represented by the chemical equation: 2K + O2 -> 2K2O. Potassium has to be heated to a high temperature to react with oxygen.
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what is the ph of the solution that results from adding 25 ml of 0.33 m hcl to 25 ml of 0.58 m nh3? (kb for nh3
The pH of the solution that results from adding 25 ml of 0.33 m HCl to 25 ml of 0.58 m NH3 is 0.30.
In order to calculate the pH of the solution that results from adding 25 ml of 0.33 m HCl to 25 ml of 0.58 m NH3, one must first calculate the total molarity of the solution.
To do this, a simple equation can be used: M = (V1 x M1 + V2 x M2) / (V1 + V2). In this case, V1 = 25 ml and M1 = 0.33 m, and V2 = 25 ml and M2 = 0.58 m, so the total molarity (M) of the solution would be 0.50 m.
The next step is to calculate the pH of the solution. To do this, simply use the equation pH = -log[H+] and substitute the molarity of the solution (0.50 m) in place of [H+]. This gives us a pH of -log(0.50 m) = 0.30.
Therefore, the pH of the solution that results from adding 25 ml of 0.33 m HCl to 25 ml of 0.58 m NH3 is 0.30.
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Which condition is caused by nitrogen bubbles and requires the use of a decompression chamber?
The condition that is caused by nitrogen bubbles and requires the use of a decompression chamber is called decompression sickness (DCS).
What is decompression sickness (DCS)?The decompression sickness (DCS) is the type of disorder that occurs whereby there is release of excess dissolved nitrogen in the blood and tissues by high pressure leading to formation of bubbles as pressure decreases.
The clinical manifestations of decompression sickness include the following:
FatigueLoss of appetiteHeadacheVague feeling of illnessThe treatment of this disorder requires the use of high-pressure decompression chamber because this restores normal blood flow and oxygen to affected tissues.
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in a covalent bond, atoms select one: a. lose electrons. b. gain electrons. c. share protons. d. share electrons.
In a covalent bond , the atoms : correct option is d. share the electrons . The covalent bond formed between the atoms by the sharing of the electrons.
The covalent bond is a bond formed between the atoms by sharing the electron pair. The compound formed by the covalent bond is called as the covalent compound. The ionic bond is formed between the atoms by the complete transfer of the electrons pair. The compound formed by the ionic bond is called as the ionic compound.
The example of the covalent bond is the methane that is CH₄. The example of the ionic compound is NaCl.
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How do you find atoms per mole?
Basically atoms per mole are calculated on the basis that 1 mole value is equal to the no of atoms in exactly 12g Of C12 Isotope of Carbon. Hence, The number of particles in 1 mole is termed as Avogadro's Number i.e. equal to (6.0221421 x 10^23).
What is C12 Isotope of Carbon?The triple-alpha process, which creates carbon-12 in stars, accounts for its abundance, which accounts for 98.93% of the element carbon on Earth. Carbon-13, the other stable isotope of carbon, is second in abundance.
Calculation:
C12 isotope has atomic mass of 12g
1 Mole =6.0221421 x 10^23 this is equal to exact no of atoms present in C12 carbon.
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The mass of an average blueberry is 0.79 g and the mass of an automobile is 1800 kg . Find the number of automobiles whose total mass is the same as 1.0 mol blueberries. Type out all steps.
The energy content of one mole of blueberries is equal to 23,000 cars , When mass of an average blueberry is 0.79 g
What exactly are cars?Automobiles are self-propelled, wheeled transportation devices for people and cargo. They now serve as an essential component of modern life, allowing people to travel short distances in a short amount of time while also offering convenient and comfortable transportation.
Evaluating :Determine the mass of 1 mole of blueberries in
The mass of one mole of blueberries is 79 g.
Step 2:
Determine how many moles of blueberries there are in 1.0 mol.
There are 1.0 mol of blueberries in 1.0 mol.
Step 3:
Convert an automobile's mass to grams
1 kg = 1000 g
Thus, 1800 kg equals 1,800,000 g.
Step 4:
Determine how many cars there are.
79 g = 1.0 mol of blueberries
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How many atoms of carbon are in 4.00 moles of C?
In 4.00 moles of Carbon (C), there are 24.088 X 10²³ carbon atoms.
As it is known that one mole of any element contains 6.022 X 10²³ atoms.
So, 1 mole of Carbon also contains 6.022 X 10²³ carbon atoms.
In the question, it has been asked the number of atoms in 4 moles of Carbon which is equal to:
4 X 6.022 X 10²³ = 24.088 X 10²³ carbon atoms.
Also, the mass of 6.022 X 10²³ carbon atoms is 12 grams.
So, the mass of 4 moles of carbon atoms can also be found:
(mass of 24.088 X 10²³ carbon atoms) = 4 X 12 =48 grams
Or, 48 X 6.024 X 10²³ amu = 289.152 X 10²³ amu (atomic mass unit).
The atomic mass of an element can be defined as the sum of the number of protons and a number of neutrons present in the nucleus of an element. It is represented by the letter 'A'.
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What is the ionic of oxygen?
The chemical reaction causes oxygen to gain two more electrons, changing it into the closest stable form of a noble gas. Furthermore, O2-ion is produced when oxygen (O) receives two electrons.
Consequently, oxygen's ionic charge (O) is 2. From the food our bodies digest to the way the sunlight we receive is created, chemical processes occur all around us. Understanding physical and chemical changes is essential before beginning chemical processes. The chemical reaction causes oxygen to gain two more electrons, changing it into the closest stable form of a noble gas. Electrons are located in the area termed the electron cloud that surrounds the nucleus of an atom. The set of primary particles that comprise an atom includes many other particles than the electron.
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What mass of calcium hydroxide is formed when 10. 0g of calcium oxide reacts with 10. 0g of water.
The 10 g of the calcium oxide reacts with the 10 g of the water and formed the calcium hydroxide. The mass of calcium hydroxide is 13 g.
Given that :
The mass of calcium oxide = 10 g
The mass of water is 10 g
The reaction is given as :
CaO + H₂O ---> Ca(OH)₂
1 mole of CaO react with 1 mole of H₂O to form 1 mole of Ca(OH)₂
The moles = mass / molar mass
Moles of CaO = 10 g / 56 g/mol
=0.179 moles
Moles of H₂O = 10 g / 18 g/mol
= 0.556 moles
CaO is the limiting reagent .
The moles of Ca(OH)₂ = 0.17 mol
Mass = moles × molar mass
= 0.17 moles × 74 g/mol
= 13 grams
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how many moles of naoh must be added to 1.00 l of 0.0500 m zn(no3)2 to just start the precipitation of zn(oh)2?
The number of the moles of NaOH added to 1.00 L of 0.0500 M Zn(NO₃)₂ to start the precipitate of Zn(OH)₂ is 0.1 mol.
The precipitation reaction is given as :
Zn(NO₃)₂(aq) + 2NaOH(aq) ---> Zn(OH)₂(s) + 2NaNO₃(aq)
The molarity of the Zn(NO₃)₂ = 0.0500 M
The volume = 1 L
The moles of the Zn(NO₃)₂ = 0.0500 × 1
The moles of the Zn(NO₃)₂ = 0.0500 mol
The 1 mole of Zn(NO₃)₂ react with 2 mole of NaOH
The moles of NaOH = 2 × 0.0500
The moles of NaOH = 0.1 mol
Thus, the moles of the NaOH is 0.1 mol.
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How does knowing the reactants and products help you classify a chemical reaction? Write a short paragraph explaining.
The reactants and products can be evaluated to determine the type of reaction by analyzing how they regroup, or interchange bonds.
What are chemical reactions ?Chemical reactions are the chemical changes involving the combinations two or more atoms forming one or more new products. There are different types of reactions such as synthesis reaction, displacement reaction, combustion, decomposition etc.
The type of reaction can be identifies by analyzing how the regrouping is taking place there. Similarly the nature of reactants will be different for each reaction type. For example reaction with atmospheric oxygen forming carbon dioxide and water is called combustion.
Similarly the reaction with hydrogen is called hydrogenation or reduction reactions. If one or two groups of the reactants are displaced between them such reactions are called displacement reactions. If two reactants simply add-up to form a single product it is called synthesis reaction.
In this way we can determine the type of chemical reactions.
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A chemist mixes 4 liters of one acid solution with 10 liters of a 40% solution, resulting in a 30% acid solution. The table shows the amount of each solution used.
The acid concentration of the first solution is 5% or 0.05
as per stated details
the initial acid solution contains 4 litres
Let the initial acid solution's concentration equal x.
so the first solution's effective dosage is 4x.
the second acid solution has a volume of 10 litres
the second acid solution's concentration is 40%, that equals 0.4.
then the second solution's effective dosage is 0.4. (10)
The resulting acid solution will then contain (4+10) litres.
the acid solution's concentration is 30%, that is 0.3
thus the final solution's effective quantity is equal to 0.3(4+10).
Combining these findings yields equation.
4x +0.4(10) = 0.3(4+10)
4x +4 = 0.3(14)
4x = 4.2 - 4
4x = 0.2
x=0.05
Therefore, the final result is 0.05, or 5%.
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How many nucleotides are needed to make a single codon?
a. 1
b. 2
c. 3
d.4
e.5
What are Lewis dot structures? In other words, what is the basis of representing valence electrons with dots? How does this knowledge help you understand Lewis dot structures of ionic and covalent compounds?
The valence electrons of an atom can be represented using Lewis dot structures, which are also used to depict the bonding and non-bonding electrons in molecules.
The valence electrons of an atom are shown by Lewis dot structures, sometimes called electron dot structures. To represent the element's valence electrons in these structures, dots are placed all around the element's symbol. The number of valence electrons that each element has depends on where it is on the periodic table. Dots are used to symbolize valence electrons in order to highlight the electrons that are available for formation of bonds. To display the bonding and non-bonding electrons in a molecule, Lewis dot structures are utilized. This can be useful in figuring out a compound's reactivity and chemical characteristics. The Lewis dot structure can be used to depict the electron transfer for ionic compounds, which are created when electrons are transferred from one atom to another. Atoms with a complete complement of electrons (ions with a positive charge) and atoms that have either gained or lost electrons are visible in the Lewis dot structure of an ionic compound (ions with a negative charge). The Lewis dot structure can be used to illustrate the sharing of electrons in covalent compounds, which are created when atoms share electrons. A covalent compound's Lewis dot structure reveals how its atoms share electrons via a covalent connection. The nature of chemical bonding, the stability and reactivity of compounds, and the prediction of bond angles, geometry, and polarity of molecules can all be better understood by knowing Lewis dot structures.
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What type of bond will form between Li and O?
The type of bond that will form between Li and O is : ionic bond.
What is meant by ionic bond?Ionic bond is also called as electrovalent bond. It is type of linkage formed from electrostatic attraction between oppositely charged ions in a chemical compound. Such bond forms when the valence (outermost) electrons of one atom get transferred permanently to another atom.
Lithium and oxygen form the ionic bond. Lithium is in group 1A, therefore each atom of lithium has one valence electron. This is Lewis valence electron structure for lithium. Oxygen is in group 6A, thus each atom of oxygen has six valence electrons.
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What change in oxidation number represents reduction?
A decrease in oxidation number represents reduction.
Redox reactions, also known as oxidation–reduction reactions, are processes that involve the transfer of electrons from one species to another. These types of reactions are known as oxidation–reduction reactions. It is said that a species has become oxidized if it has lost electrons, while it has been said that a species has become reduced if it has gained electrons.
Using oxidation numbers, which are assigned to atoms in molecules by presuming that all bonds to the atoms are ionic, we are able to determine whether or not a reaction is a redox in nature. During the course of a process, oxidation is indicated by an increase in the oxidation number, and reduction is indicated by a decrease in that number.
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Neutrons are in the nucleus of the atom. A neutron has
Neutrons are located inside the nucleus of an atom. Neutrons are neutral particles and they don't have charge has a mass.
What are neutrons ?Neutrons are neutral subatomic particles located inside the nucleus of an atom. Other subatomic particles are electrons and protons. Protons are positively charged particles located with the neutrons inside the nucleus. The neutrons and protons together are called nucleons.
Electrons are negatively charged particles revolving around the nucleus through circular trajectories of fixed energies. The atomic number of an element is the number of its electron in its neutral state.
The mass number of an atom is the sum of number of protons and number of neutrons. The atoms with same number of neutrons are called isotones. Neutrons have mass comparable to that of protons.
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