for the above example there are 27 protons, 31 neutrons, 27 electrons
Atomic number is equal to the number of protons and equal to the number of electrons. So 27 = number of protons = Number of electrons. Mass number is the sum of the number of proton and neutrons Mass number = 58 = Number of proton + Number of neutrons .Number of neutrons = Mass number - Number of protons 58-27=31 The charged amount of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number. For conventional nuclei, this is equivalent to the proton count or the amount of protons in the nucleus of every atom in that element
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What do subscripts in an empirical formula indicate?; What is the symbol of empirical formula?; What is the purpose of a subscript in a molecular compound?; What does the subscript 2 indicate in br2?
If there is more than one atom of a specific kind, the number is written as a subscript following the atom. Molecular formula is the representation of the molecule to show the number of atoms.
Empirical formulas are normally used to represent substances with undetermined molecular structures or substances not made up of normal molecular entities. A molecular formula is a representation of a molecule that uses chemical symbols to indicate the types of atoms followed by subscripts to show the number of atoms of each type in the molecule. A subscript is used only when more than one atom of a given type is present. we use the symbol of the element and include the subscript "2" to indicate that two atoms of that element are joined together. It indicates two atoms of the element have joined together to form a molecule in br2.
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be sure to answer all parts. by taking into account electronegativity differences, draw the products formed by heterolysis of the carbon-heteroatom bond in the following molecule. classify the organic reactive intermediate as a carbocation or a carbanion. use a skeletal structure to draw the organic ion.
by taking into account electronegativity differences, the organic reactive intermediate is a carbocation .When a covalent bond is broken, a previously bonded species takes both of the original bonding electrons from the other species.
This process is known as heterolysis or heterolytic fission. In other words, the electrons from the less electronegative atom will go to the more electronegative atom. Compared to lithium, carbon has a higher electronegativity. Therefore, upon heterolytic cleavage, carbon will possess both bonding electrons and a negative charge, resulting in the formation of a carbanion. Carbocation with an empty p orbital perpendicular to the plane of the positively charged molecule is generated via heterolytic cleavage of a bond and has a planar shape. Because of its positive charge, it reacts with nucleophiles, which are entities with lots of electrons.
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What is the frequency of
an electron with a wavelength
of 225 nm?
[? ] × 10¹²] Hz
c = 3.0 x 108 m/s
The frequency of an electron with a wavelength of 225nm is 1.33 × 10¹² Hz.
How to calculate frequency?Wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next.
Wavelength is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.
λ = v/f
According to this question, an electron has a wavelength of 225nm i.e. 2.25 × 10-⁷m. The frequency is calculated as follows:
2.25 × 10⁷ = 3 × 10⁸/f
f = 3 × 10⁸ ÷ 2.25 × 10-⁷
f = 1.33 × 10¹²Hz
Therefore, 1.33 × 10¹² Hz is the frequency of the electron.
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Why do chemical reactions occur at all?; What occurs during all chemical changes?; What causes a chemical change?; Do chemical changes occur everywhere?
When atoms establish or break chemical bonds, chemical processes take place. When bonds between molecules or atoms are created, disrupted, or both, chemical changes result.
Which four chemical substances are they?Covalent bonds hold together molecules, ionic bonds hold together ions, metallic bonds hold together intermetallic compounds, and coordinate covalent bonds hold coordination complexes together.
What constitutes a chemical?Each molecule with just an analytical grade is deemed to be a chemistry. So a chemical always has the same "stuff," to put it another way. Natural substances like water include certain compounds.
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1. Consider the following compounds: Cl2 and CsCl
a) Which of these substances has non-polar bonds? Explain your reasoning.
b) Which of these substances is the most ionic? Explain your reasoning.
c) Suggest a substance which has polar covalent bonds. Explain your reasoning
Non-polar bonds are present in Cl2 compounds. CsCl compounds are the most ionic PCl3 or SCl2 compounds with polar covalent bonds.
a) Because the atoms at each end of the connection are the same, Cl2 will have non-polar bonds. On average, the electron pair will be kept midway between the two. There isn't a net pull either way.
b) CsCl. One or more chlorine atoms are connected to cesium, which has the lowest electronegativity of all the atoms on the list. As a result, when cesium meets chlorine, the difference in electronegativity will be the highest of all the cases on the list. The electron pair will be more strongly drawn to one end of the bond and the compound will be more ionic the greater the difference in electronegativity.
c) You might recommend either SCl2 or PCl3, which are the two options. You are seeking for an example with a tiny electronegativity difference because polar covalent bonds do not have enough electronegativity difference to produce ions.
When atoms with differing electronegativities share electrons in a covalent link, this creates a polar covalent bond. Let's have a look at the molecule of hydrogen chloride (HCl). The inert gas electron arrangement of each atom in HCl demands one additional electron.
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Answer: By considering Cl2 and CsCl compounds,
Cl2 compounds are non polar bonds. The most ionic compounds are CsCl compounds and CHCl3 compounds have polar covalent bonds.
Explanation:
a) Compounds that are non polar bonds have zero dipole moment. such molecules have an even distribution of charge between their atoms. The Cl2 molecule is a diatomic molecule consisting of two chlorine atoms. Both atoms have equal electronegativity. It denotes both atom share an equal proportion of charge. Thus the molecule formed by two chlorine atoms is always nonpolar.
b) According to Fajan’s Rule:
Greater the difference of electronegativity between atoms stronger is the ionic bond. As a result, when Cs meets Cl, the electronegativity difference is very high. Hence CsCl is most ionic and in cations the Cs is down the group in group 1 alkali metals and it is more Electopositive and has larger radius.
c) Polar covalent bonds are present in substances whose dipole moment is not zero. As for example, CHCl3 is a polar molecule due to the large electronegativity difference between hydrogen and chlorine. This induces a permanent dipole across the molecule with a partial positive charge on the hydrogen atom and a partial negative charge on the chlorine atoms. Therefore CHCl3 is a polar covalent compound because its dipole moment is not zero.
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in which of the following compounds is the oxidation number of s equal to 4? question 15 options: a) h2s b) na2so3 c) mgso4 d) s8 e) s2cl2
containing sulfur and having a bonus oxidation state The two SOCLs are. The word "oxidation" was first used to describe an object's reaction with oxygen by Antoine Lavoisier.
What takes place during oxidation?When oxygen reacts with a material or an element, an oxidation process occurs. Another meaning of oxidation is the elimination of hydrogen from reactant species. When a molecule, moiety, or ion loses electrons, it goes through oxidation
What can be said about oxidation?By losing electrons in a reaction, a reactant is said to have undergone oxidation. When a reactant undergoes a reaction, reduction is the procedure through which it picks up electrons. When metals plus acids interact, this happens regularly. When a reactant loses electrons, the process is referred to in science as oxidation.
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classify each of the following as a property of acids or bases. drag each item to the appropriate bin.
Answer:
Acids- Taste sour, turn litmus paper red, dissolve many metals
Bases- Taste bitter, turn litmus paper blue, feel slippery
Explanation:
Property of Acids:
Taste sourTurn litmus paper redDissolve many metalsProperty of Bases:
Taste bitterFeel slipperyTurn litmus paper blueWhat are Acids and Bases?Chemical substances with different characteristics include bases and acids. When a substance is dissolved in water, an acid or base will produce hydrogen ions (H+), while a base will produce hydroxide ions (OH-). Acids are often sour in taste, corrode metals and turn litmus paper red.
In contrast, bases often taste bitter, feel greasy or soapy to the touch, and turn litmus paper blue. The acidity or basicity of a solution is determined using the pH scale, in which a pH of 7 indicates neutrality, a pH value less than 7 indicates acidity, and a pH value above 7 indicates basicity.
Therefore, property of Acids:
Taste sourTurn litmus paper redDissolve many metalsProperty of Bases:
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select all the statements that correctly relate the degree of shielding of a nucleus to its chemical shift.
From right to left on a spectrum, chemical shift gets stronger. In terms of ppm, chemical shift is quantified. Using a reference signal as a benchmark, chemical shift is calculated.
What exactly does a nucleus do?The nucleus houses the genes, structures that hold the hereditary information, and regulates and controls the functions of the cell (such as growth and metabolism). In the nucleus, nucleoli, which are tiny bodies, are frequently seen. nucleoplasm.
What elements comprise a nucleus?Neutrons and protons, which have opposite electric charges, make up atomic nuclei. The strongest basic force now understood, known as the strong force, is what holds these things together. A normal atom's nucleus generally holds more than 99.9% of the atom's mass yet takes up considerably less than.01 percent of its volume.
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The outer shell electrons in metals are not tightly bound to the nuclei of their atoms. They are free to roam throughout the material, moving from atom to atom. These materials are good ____. conductors insulators for nothing
The outer shell electrons in metals are not tightly bound to the nuclei of their atoms. They are free to roam throughout the material, moving from atom to atom. These materials are good conductors.
A conductors can be defined as the substances and the materials that will allow flow of the electricity through it. in the conductors the electrons or the ions can be easily move from the one atom to another atom. in the case of metals the outer shell valence electrons are loosely bounded to the nucleus. the electrons are free to move from in the material that is from the one atom to the other atom.
Thus, the metals are the good conductors of the electricity.
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Question 6 (1 point)
Consider the hypothetical equilibrium system below:
A+B+C
What is the equilibrium constant of this system if the initial concentrations of A and
B were each 0.238 M, and the equilibrium concentration of C is 0.072?
Your Answer:
The equilibrium constant of the system can be obtained as 2.6.
What is the equilibrium constant?We know that we have to obtain the equilibrium constant by setting up the ICE table of the reaction as we can see in the portion below and this is shown as;
A + B ⇆ C
I 0.238 0.238 0
C -x -x +x
E 0.238 - x 0.238 - x 0.072
At equilibrium, we would have;
[A] = 0.238 - 0.072
= 0.166
[B] = 0.238 - 0.072
= 0.166
Then;
K = [C]/[A] [B]
K = [0.072]/(0.166)^2
K = 2.6
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Due to the extensive regulatory systems in the cell, tRNAs are rarely found attached to incorrect amino acids. True/False
False. Due to the extensive regulatory systems in the cell, tRNAs are rarely found attached to incorrect amino acids.
Transfer RNA (tRNA) is a molecule synthesized from the process of transcribing DNA into segments located in specific regions of chromosomes. It is involved with protein synthesis in the mechanism of gene translation. This molecule is responsible for driving amino acids to form the polypeptide chains that make up proteins.
While it is true that a cell has extensive regulatory systems to prevent the attachment of an incorrect amino acid to a tRNA, it is not true that the attachment of an incorrect amino acid is impossible, although rare, can happen.
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Identify the reactant, reagents, and intermediates in the synthetic sequence shown. Reagents may be used more than once or not at all. Draw the intermediate products Band C (both are neutral; omit byproducts). 1.1) NINH Compound B H. Pac 1.2) 1-bromo-2 methylpropane 2.1) NaNH, 2.2 2. butanone 2.3) H* OH step 3 reagent Compound C H, Lindlu's cat Answer Bank HPC NaNH N/NH Boetylene H, Lindtar's cat Incorrect Draw compound B. incorrect Incorrect Draw compound C
The reagents are H2, Pd/C at step 1 and H2, Lindlar's cat at step 3. The reactants are 1.1) NaNH2, 1.2) 1-bromo-2 methylpropane, 2.1) NaNH2, 2.2) 2 butanone, and 2.3) H+.
When the base H2, Pd/C reagent reacts with any NaNH2, an acidic proton is initially abstracted, leaving carbon with a negative charge that will be counterbalanced by any plus. Now, this alliance will attack the chemical one bromo three methylpropane from the back, releasing a negative. And substance B is created. NaNH2 and Compound B will react. There is acidic hydrogen compound B present, and NaNH2 will eliminate it. 2 Butane reacts with hydrogen that is acidic to produce Compound C which further reacts with reagent H2, Lindlar's cat to produce final product.
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I'm struggling with this differential rate law equation. The question and context are in the image. Thank you.
Answer:
3.Rate law=k[BH3]^1×[NH3]^1
Explanation:
first and 2nd trial comparison
when NH3 is halved, the rate is halved and therefore the exponent is 1
2nd and third trial comparison
0.125 to 0.100
which will effect the initial rate by ×100/125
the initial rate would be 0.0852×200/250
will be 0.0682
therefore the exponent for BF is 1
What are the substances that are present before a reaction takes place called the ones to the left of the arrow?; What is the reaction of a substance with oxygen called?; What are molecules called before and after a chemical reaction?
The reaction of a substance with oxygen called combustion.
What is a Chemical reaction?
A mechanism that significantly directs the chemical transformation of one group of chemical substances or molecules into another may be referred to as a chemical reaction. Numerous catalysts are used in this chemical transformation process to speed up the reaction.
Reactants are the elements to the left of the arrow in a chemical equation. Reactants are substances that are present at the beginning of a chemical reaction. Products are the substance(s) to the right of the arrow.When a chemical combines with oxygen gas, it produces a combustion reaction that releases energy in the form of heat and light. O2 must be one of the reactants in combustion processes. Hydrogen gas is burnt to produce water vapor.[tex]2H2(g)+O2(g)[/tex] → [tex]2H2O(g)[/tex]Therefore, the reaction of a substance with oxygen called combustion.
3. We refer to the molecules before and after a chemical reaction, respectively, as reactants and products.
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What are 5 examples of ionic bonds?
Examples of ionic bonds include:sodium chloride, or NaCl.sodium bromide, or NaBr.sodium fluoride, or NaF.sodium iodide, or NaI.potassium fluoride, or KF.
Which substance has an excellent ionic connection as an example?Sodium fluoride, often known as NaF, is created when two atoms of sodium and one of fluorine establish an ionic bond.The fluorine atom, with just enough room, accepts the sodium atom's single valence electron as part of this process.
Provide two examples of ionic bonds.When electrons move from one atom or group to another, they generate positive and negative ions, which are electrostatically attracted to one another. This electrostatic attraction is the basis for the formation of an ionic connection.Example: NaCl, KBr, etc.
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what occurs at stage a?; what occurs at stage a water cools and turns to liquid; in the water cycle, clouds form as a result of; during which process of the water cycle does water change from a gas to a liquid?; what occurs at stage a brainly; condensation; how can water vapor in the air return to earth; what is precipitation
At stage a water cools and turns to liquid is called as condensation. in the water cycle, clouds form as a result of condensation . during which process of the water cycle does water change from a gas to a liquid is condensation.
The stage a water cools and turns to liquid; in the water cycle is the condensation . in the water cycle, clouds form as a result of the condensation. the cloud formation is the stage of the condensation. in condensation the water vapor changes to the gas to liquid. condensation is during which process of the water cycle does water change from a gas to a liquid.
The precipitation is the stage at which the when the enough droplets are merge and it falls out the cloud to the ground below called as precipitation.
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A cyclotron is used to accelerate electrons. Electrons are released from rest near the center of the cyclotron. The amplitude of the voltage across the gap in the cyclotron is 20 V. The magnetic field in the cyclotron is 0.5 T. The cyclotron accelerates the electrons to a speed of 5 * 10^7 m/s. Find the cyclotron frequency. What is the radius of the largest semicircle that the electron traces out before exiting the cyclotron What is the kinetic energy of the electron when it exits the cyclotron How many semicircles does the electron trace out before exiting the cyclotron
To accelerate electrons, a cyclotron is ineffective. The electron's mass is very small, which causes a sharp increase in its speed. Similar to how the electrons drift away from the oscillating electric field due to rapid relativistic variation in their mass.
Positive ions are accelerated by cyclotrons, which are machines. Velocity is a factor in cyclotron frequency. Since electrons have such a small mass, they cannot be accelerated by a cyclotron. Because of this, the electron will be thrown out of step with the oscillating field because the velocity will be increased to such a high degree.
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Solve an equilibrium problem (using an ICE table) to calculate the pH of each of the following solutions. Ka(HF)=3.5 x 10^-4 a. ) 0.14 M HF b) 0.14 M NaF c) a mixture that is 0.14 M in HF and 0.14 M in NaF
The pH of each of the 0.14 M HF solution is 2.166, and the pH of each of the 0.14 M NaF solution is 8.30. The pH of the combined solution of 0.14 M HF and 0.14 M NaF is 3.45.
a) pH of 0.14 M HF solution is
ICE table
HF + H2O <===> H3O+ + F-
initial 0.14 - -
change -x +x +x
Eq 0.14-x x x
So,
Ka = [H3O+][F-]/[HF]
3.5 x 10^-4 = x^2/0.14-x
x^2 + 3.5 x 10^-4x - 4.9 x 10^-5 = 0
x = [H3O+] = 6.83 x 10^-3 M
pH = -log[H3O+] = 2.166
b) pH of 0.14 M NaF
ICE table
Naf + H2O <===> HF + OH-
initial 0.14 - -
change -x +x +x
Eq 0.14-x x x
So,
Kb = Kw/Ka = [HF][OH-]/NaF]
1 x 10^-14/3.5 x 10^-4 = 2.86 x 10^-11 = x^2/0.14-x
x^2 + 2.86 x 10^-11x - 4 x 10^-12 = 0
x = [OH-] = 2 x 10^-6 M
pOH = -log[OH-] = 5.70
pH = 14 - pOH = 8.30
c) a mixture of equal concentrations of both NaF and HF
pH = pKa
pKa = -log[Ka] = -log(3.5 x 10^-4) = 3.45
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in scrum a____is defined as a piece of a product that delivers some useful functionality to a customer.
According to scrum, a feature is a component of a product that offers or provides a customer some practical functionality.
The features in Agile approaches stand for a section of functionality that provides significant business value and meets a stakeholder requirement. User stories are the building blocks of features. "A feature is a service that meets the needs of a stakeholder. A benefit hypothesis and acceptability criteria are included for each feature. The Product Manager is in charge of the Features in the Scaled Agile Framework.
Although she doesn't necessarily compose them, she has the last say about the feature's priorities and content. Some businesses describe the person who is in charge of defining and ensuring that the feature is executed as intended using the role of feature owner rather than that of product manager.
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Is a charge indicated on the neutral atoms? If yes, where is it located?
Neutral atoms do not have a charge indicated on them because they have an equal number of protons and electrons, which cancel each other out. This means that the net electrical charge of a neutral atom is zero.
Protons and neutrons, which make up the nucleus of an atom, are positively charged. Electrons, which orbit the nucleus, are negatively charged. In a neutral atom, the number of protons and electrons is equal, so the positive charge of the protons is canceled out by the negative charge of the electrons, resulting in a net charge of zero.
However, atoms can gain or lose electrons to form ions, which do have a net electrical charge. If an atom gains one or more electrons, it becomes negatively charged and is called an anion. If an atom loses one or more electrons, it becomes positively charged and is called a cation. The charge of an ion is indicated by a superscript after the chemical symbol for the element, for example, Cl- for chloride ions (anions) and Na+ for sodium ions (cations).
Why do nonmetals form negative ions?; Do nonmetals tend to gain electrons to form negative ions?; Why do nonmetals tend to gain electrons?; How do nonmetals gain a negative charge?
Due to their increased number of valence electrons and propensity to gain electrons quickly, nonmetals have a propensity to generate negative (- charged) ions. Ionic bonds so typically occur between a metal and a nonmetal.
How do nonmetals gain a negative charge?Nonmetals frequently pick up electrons to create negatively charged ions.
To complete the octet in their valence shell, nonmetals like chlorine, fluorine, oxygen, and nitrogen frequently receive electrons from atoms of other elements, especially metals like sodium, calcium, and aluminum. Nonmetals have high electronegativity values as a result of this propensity. Nonmetals create ions with a negative charge by absorbing electrons from other chemical entities (i.e. anions). An exothermic reaction occurs when an electron is added to a neutral nonmetallic atom, releasing some energy in the process.
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The initial concentration and the Ka values of several weak acid (HA) solution are listen here. for which of these is the x is small approximation least likely to work in finding the ph of the solution?
The small approximation least likely to work in finding the pH of the reaction is 0.05 M, 1.0 ×10- 3. The correct option to this question is C.
Consider a monoprotic acid in the form of HA, which can only produce one proton.
Ka is the indicated acid dissociation constant.
Let's write the weak acid HA's dissociation.
Aqueous HA = H+ + A-
Baseline y 0 0
change - x x x
equilibrium (y-x) x M xM
Acid concentration is given as [HA] = 0.32 M, meaning that at equilibrium, we have (y-x) M.
Consequently, we have from the acid dissociation constant expression,
Ka =[H+][A-]/ [HA]
Ka= x×x/(y-x)
Ka= x^2/ y
This introduces the idea of approximation, where x is relatively little in relation to the original concentration of the acid, y, thus we can think of (y x ) y.
When the equilibrium constant value and the acid's starting concentration are near to one another, this approximation is invalid.
We can see that, of the options given, option c). 0.05 M, 1.0× 10-3 has the closest values of Ka and y. So the approximation is of the least importance in this case.
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Complete question :
The initial concentration and Ka's of several weak acid (HA ) solutions are listed here.
Part A
For which of these is the x is small approximation least likely to work in finding the pH of the solution? For which of these is the x is small approximation least likely to work in finding the pH of the solution?
A) 4.0 M 1.5 * 10-3
B) 6.00 M 1.0 * 10-6
C) 0.05 M 1.0 * 10-3
D) 0.100 M 1.0 * 10-5
How many grams in 4.65 x 1024 atoms of He?
Answer:
30.9 g He
Explanation:
To find the mass of the helium (He) sample, you need to
(1) convert atoms to moles (using Avogadro's Number)
(2) convert moles to grams (using the atomic mass of He)
It is important to arrange the conversions/ratios in a way that allows for the cancellation of units. The final answer should have 3 sig figs like the given value (4.65 x 10²⁴ = 3 sig figs).
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
Atomic Mass (He): 4.0026 g/mol
4.65 x 10²⁴ atoms He 1 mole 4.0026 g
-------------------------------- x -------------------------------- x ----------------- = 30.9 g He
6.022 x 10²³ atoms 1 mole
1) How many molecules are there in 10 moles of O₂ (g)?
Answer: There are 1.51×1023molecules O2 in 10.0 g O2 .
6.022e+24
Explanation: If you are trying to convert moles into molecules than you want to multiply the amount of moles (in this case 10) by Avogadro's number (6.022x10^23) and you get the number of particles/atoms/molecules. If you are trying to get the amount of moles from particles/atoms/molecules than you divide the number of molecules by Avogadro's number and get the amount of moles.
If you want to go from mass to mol
then divide by molar mass
If you want to go from mol to mass
then multiply by molar mass
What determines the amount of products formed in a chemical reaction?; How are chemical equations used in stoichiometry?; What is the ratio of reactants and products in a chemical reaction called?; What makes stoichiometry a relationship between reactants and products?
The amount of products that are generated are based on the mass of the reactants in the reaction.
The ratio of reactants and products in a chemical reaction is called chemical stoichiometry.
The stoichiometric coefficients help us to establish the mole ratio between reactants and products.
What is stoichiometry?
Stoichiometry is based at the regulation of conservation of mass where the overall mass of the reactants equals the overall mass of the products, leading to the insight that the members of the family among quantities of reactants and products commonly form a ratio of wonderful integers. This means that if the amounts of the separate reactants are recognized, then the quantity of the product can be calculated. Conversely, if one reactant has a known quantity and the amount of the products may be empirically determined, then the quantity of the opposite reactants can also be calculated.To know more about stoichiometry, click the link given below:
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Which best describes hydrogen bonding?
Dipole-dipole interactions between molecules that do not include a covalent bond to a hydrogen atom are known as hydrogen bonds. The attraction between two incredibly electronegative atoms, such N, O, or F, and a hydrogen atom that is covalently bonded to one of them causes it to occur.
Any electronegative atom, such as oxygen, chlorine, or fluorine, may make up the other atom, whereas one of the atoms is hydrogen. Between molecules or between two different molecules, hydrogen bonds can develop between the atoms.
How to determine hydrogen bonding?
Determine whether hydrogen bonds are likely by looking at the molecule's Lewis structure. The electronegative atom needs one or more unshared electron pairs and a negative partial charge, much like oxygen and nitrogen do.
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What group column is lithium on the periodic table?; What are the columns vertical called on the periodic table Why are they called this?; What are the columns going down the periodic table called?; What group or period contains Li and Cs?
The alkali metals are represented by the elements hydrogen, lithium (Li), sodium (Na), cesium (Cs), and francium (F) (Fr). Except for hydrogen, these metals are soft, glossy, low-melting, extremely reactive, and tarnish.
Lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium make up the chemical elements that make up the alkali metals (Fr). Group 1, which is located in the s-block of the periodic table, is made up of them and hydrogen. All alkali metals have an s-orbital for their outermost electron, and as a result, they all have many of the same distinguishing characteristics. In fact, the alkali metals offer the finest illustration of group trends in periodic table features, with elements exhibiting well-defined homologous behavior. Because lithium is the family's major member, it is sometimes known as the lithium family.
At standard pressure and temperature, the alkali metals are all gleaming, supple, and extremely reactive metals that rapidly lose their outermost electron to create cations with charge +1.
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Which of the following is the correct statement of law of conservation of matter?
According to the principle law of conservation of mass, matter cannot be created or destroyed.
What law governs the conservation of matter?According to the Law of Conservation of Matter, even when matter transforms into a different form, the amount of matter remains constant. Although it may occasionally appear that matter vanishes during a scientific experiment, this law informs us that matter does not magically appear or vanish; rather, it only transforms from one form to another.
What is the mass Mcq conservation law?A chemical reaction neither creates nor destroys atoms.Only the products are produced after the reactants' atoms have been rearranged. Therefore, mass remains constant during a chemical process.
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examine the following set of ionization energy values for a certain element. how many valence electrons does an atom of the neutral element possess?
The atom of the element must have about three valence electrons.
What is the ionization energy?We define the ionization energy as the energy that we have to supply to the atom of the element so that the atom can be able to loose electrons. Now if the electrons that we are about to loose is the first electron that is to be lost from the atom then we can talk about the first ionization energy.
In practical terms however, we can be able to loose all of the electrons that are present in the inside of the atom but this is going to take up a lot of energy and this where this question becomes quite important.
If we survey the values of the ionization energy that we have been given, we can see that after the third value of the ionization energy, there is an unprecedented jump in the value of the ionization energy.
The implication of this is that the fourth electron is in an inner shell that requires a much higher energy to be removed from the atom.
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Missing parts;
Examine the following set of ionization energy values for a certain element. How many valence electrons does an atom of the neutral element possess? Ionization step - Ionization energy (kJ/mol) IE1 - 1012 IE2 - 1903 IE3 - 2912 IE4 - 4956 IE5 - 6273 IE6 - 22233 IE7 - 25997 IE8 - 27575 Express your answer numerically as an integer.
Draw the major organic product for each of the two situations.
(a) Phenylacetic acid is treated first with Br2 and one equivalent of PBr3, then with a large excess of ethanol.
(b) Propionic acid is treated first with Br2 and one equivalent of PBr3, then with a large excess of ammonia.
a) Phenylacetic acid is treated first with Br2 and one equivalent of PBr3, then with a large excess of ethanol is 2-bromo-2-phenyacetic acid.
b) Propionic acid is treated first with Br2 and one equivalent of PBr3, then with a large excess of ammonia is Alanine.
The are the examples of the Hell-Volhard-Zelinsky reaction .
a) when phenylacetic acid react with the PBr₃ it will convert to the major product as 2-bromo-2-phenyacetic acid.
b) Propionic acid is treated first with Br2 and one equivalent of PBr3, produces the 2-bromo propanoic acid and then it treated with a large excess of ammonia and produces the major product as is Alanine.
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