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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check all features below that you included in your lewis structure. correct number of si and cl atoms si as the central atom line (single bond) between si and each of the four cl atoms six dots (electrons) associated with each cl atom no other lines or dots
Chlorine has a higher electronegativity than hydrogen but the attraction of the chlorine atom for electrons is not sufficient to remove an electron from hydrogen.
Explain about Lewis structure?Check all features below that you included in your Lewis structure.
correct number of S and Cl atomsS as the central atomline (single bond) between S and each of the two Cl atomssix dots (electrons) associated with each Cl atomfour dots (electrons) associated with the S atomno other lines or dotsDistributed in Polar covalent bonds. Some atoms are exceptions to the octet rule because they have extended octets.Hydrogen bonds are intermolecular forces acting between ammonia molecules. Due to the difference in electronegativity between the nitrogen and hydrogen atoms, a partial negative charge develops on the nitrogen atom and a partial positive charge develops on the hydrogen atom. Fluorine is the most electronegative of the group 17 elements, and iodine is the least electronegative. Therefore, the electronegativity difference between fluorine and iodine is the largest.The valence electrons in an atom or molecule are displayed as dots in a Lewis structure. A single dash can occasionally be used to denote shared electrons in molecules.Trigonal bipyramidal structure describes PCl5. The arrangement of the trigonal bipyramidal structure results in opposite bonds cancelling each other's dipole moments, making PCl5 nonpolar.Learn more about Lewis's structure here,
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when you combust 100.0 g 100.0 g of propane at 500. k 500. k and 1.00 atm 1.00 atm in a closed container, you expected to collect 279 l 279 l of carbon dioxide. instead, when you collect the gas, it measures 651 l 651 l in total. which of the following accounts for this difference?
for the following accounts Theoretical yield was calculated incorrectly
The random error that results from measuring the masses of the reactants and the product (+ or - 0.001 g?) could cause experimental error in a yield measurement. Or it can be a deliberate mistake brought on by impurities that are still in the final product (and artificially inflating its mass). Because the real yield is frequently lower than the theoretical value, percent yield is typically lower than 100%. This may be due to incomplete or conflicting reactions or sample loss during recovery.
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Please Help ASAP!
100 Points + Brainliest if correct!
Moles Fe = 209.7 g / 55.847 = 3.75
the ratio between CO and Fe is 3 : 2
Moles CO needed = 3.75 x 3 / 2 = 5.63
Mass CO = 5.63 mol x 28.01 g/mol =157.7 g
this gc analysis will not require a response factor run because the products are constitutional isomers
Given statement is True Regarding Gc analysis.
A GC analysis will not require a response factor run because the products are constitutional isomers.
Gas chromatography (GC), along with other chromatographic techniques, is vitally important in forensic science to separate substances of analytical interest. GC is the primary technique for the analysis of fire residues.
GC is used as one test to help identify components of a large liquid mixture and determine their relative concentration. It may also be used to separate and purify components of a mixture. Additionally, gas chromatography can be used to determine vapor pressure, heat of solution, and activity coefficients.
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NaCl Solution Possible Reactions: Possible Anode Reactions Possible Cathode Reactions NaCl Solution Observations: (be sure to include initial and final litmus tests) Anode Observations Cathode Observations Litmus before=neutral Litmus after=acidic Bubbles Litmus before=neutral Litmus after= basic Bubbles NaCl Solution Electrolysis Reactions: Based on your observations, select the half-reactions you think were actually occurring at the anode and cathode. Write the appropriate half-reactions and then determine the overall cell reaction. Anode Half Reaction: Cathode Half Reaction: Overall Cell Reaction: Potassium lodide Solution Electrolysis KI Solution Possible Reactions Possible Anode Reactions Possible Cathode Reactions Experiment 26. Investigation of Electrochemical Cells nov. 817) Page 13 KI Solution Observations: (be sure to include initial and final litmus tests) Anode Observations Cathode Observations Litmus before=neutral Litmus after=neutral Yellow solution Litmus before=neutral Litmus after-basic Bubbles KI Solution Electrolysis Reactions: Based on your observations, select the half-reactions you think were actually occurring at the anode and cathode. Write the appropriate half-reactions and then determine the overall cell reaction. Anode Half Reaction: Cathode Half Reaction: Overall Cell Reaction: Copper Sulfate Solution Electrolysis CuSO Solution Possible Reactions: Possible Anode Reactions Possible Cathode Reactions Cuso. Solution Observations: (be sure to include initial and final litmus tests) Anode Observations Cathode Observations Litmus before=neutral Litmus after acidic Bubbles Litmus before=neutral Litmus after=neutral Copper coated the electrode
NaCl Solution Electrolysis
At cathode: reduction => 2Na+(l) + e– → Na(l)
At anode: oxidation => 2Cl–(l) → Cl2(g) + 2e–
Net Reaction is written as: 2Na +(l) + 2Cl–(l) → 2Na(l) + Cl2(g)
Potassium lodide Solution Electrolysis
At the cathode potassium ions are discharged:
K+ + e → K
At the anode iodide ions are discharged:
I− →1/2 I₂+ e
Two competing reactions are possible at both cathode and anode. At Cathode: reduction reaction: at pH =7
Water can be reduced to hydrogen gas or Sodium ions reduced to sodium metal.
2H2O(l) + 2e– → H2(g) + 2OH
Na+(l) + e– → Na(l)
At anode: Oxidation reaction: at pH =7. Water can be oxidized to oxygen or chloride ion oxidized to chlorine molecule.
2H2O → O2(g) + 4H+ + 4e
2Cl– → Cl2 + 2e
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What type of bond is Na3PO4?; Is Na3PO4 ionic or molecular?; Does Na3PO4 have ionic and covalent bonds?; Is Na3PO4 a polyatomic ion?
The type of the bond is present Na₃PO₄ is the ionic bond. the Na₃PO₄ is the ionic compound. yes the Na₃PO₄ is the polyatomic ion.
The Na₃PO₄ is Na⁺ and PO₄³⁻. the phosphorus is the non metal and the oxygen atom is the non metal. the non meta and non meta form the covalent or molecular bond. the bond between the PO₄³⁻ bond is the covalent bond but the overall present in the Na₃PO₄ is the ionic bond . the bons in between the Na⁺ and PO₄³⁻ is the the ionic bond. the PO₄³⁻ id the polyatomic ion .
The bond between the positively charged ion and the negatively charged ion are called as the ionic bond and the compound form is the ionic compound.
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Consider a chemical species in which a carbon atom forms single bonds to three hydrogen atoms in which the carbon atom possesses no other valence electrons.
(a) What formal charge would the carbon atoms have?
(b) What shape would you expect this species to have?
(c) What is the hybridization of carbon atom?
The Formal charge is present on carbon which is +1. It has a triangular planer shape with sp2 hybridization- the concept of mixing two atomic orbitals to give rise to a new type of hybridized orbitals.
valence electron is an elementary particle in an atom's outer shell that really can take part in the development of a chemical bond if the outer layer is not shutdown. Both atoms inside a single covalent bond make a contribution each valence electron to create a shared pair. Valence electrons are ionic found in an organism's outermost shell. So because electrons in the outermost shells of two or more atoms are the first to come into contact with each other and decide how an atom might very well respond in a chemical process when two or more atoms interact. Numerous important molecules in your body, such as proteins, DNA, RNA, sugars, and fats, are composed of carbon atoms.
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How many grams of Al are needed to
produce 0.450 L of 1.6 M solution
of AICI3?
2AI+ 6HCI 2AlCl3 + 3H₂
[?] g Al
a sample of n2o3(g) has a pressure of 0.010 atm . the temperature (in k) is then doubled and the n2o3 undergoes complete decomposition to no2(g) and no(g). part a find the total pressure of the mixture of gases assuming constant volume and no additional temperature change. Enter your answer numerically, in terms of atm.
Thus, the total pressure is 0.184 atm.
What is Pressure?
The amount of pressure exerted (thrust) on a floor in line with unit place is described as ‘pressure’. It can also be defined as the ratio of the force to the place (over which the pressure is performing).
The force applied perpendicular to the surface of an object in step with unit vicinity over which that force is sent.
PV=nRT is the ideal gas equation.
Where P denotes pressure, V denotes volume, n is the number of moles, R denotes the gas constant, and T denotes temperature.
As a result, the temperature of the sample will only be doubled, with the same volume and number of moles. Because temperature and pressure are inextricably linked, if one rises, the other must rise as well, resulting in a pressure of 0.092 atm.
The following are the steps in the breakdown process: Decomposition reaction: ⇄ +
As a result, 1 mole of produces 2 moles of products (1 of each), and n doubles. The pressure will double to 0.184 atm since the volume and temperature are now constants, and the pressure is directly proportional to the number of moles.
Thus, the total pressure is 0.184 atm.
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Rubbing alcohol is 70.% v/v isopropanol. How many mL of rubbing alcohol contain 5.0 mL of isopropanol?
A 500mL rubbing alcohol contains 350mL of isopropyl alcohol.
How to Calculate for Solute
1. Identify the given.
% v/v = 70% or 0.70
mL of solution = 500mL (rubbing alcohol)
2. Identify which quantity is required.
mL of solute = ? (isopropyl alcohol)
3. List down the equation to be used.
mL of Solute = (% v/v)(mL of solution)
4. Then, substitute the given quantities in the equation.
mL of solute = (0.70)(500mL)
5. Simplify or solve the equation, and interpret the answer.
mL of solute = 350mL of isopropyl alcohol
Interpretation: There is 350mL of isopropyl alcohol in a 500mL rubbing alcohol solution.
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When molecules begin to react, the rate of the forward reaction is faster than the rate of the reverse reaction. true or false?
When molecules begin to react, then the rate of the forward reaction is faster than the rate of reverse reaction: true
Why forward reaction is faster than reverse?When molecules begin to react, rate of the forward reaction is faster than reverse reaction. As reactants are consumed and products accumulated, the rate of the forward reaction decreases and rate of the reverse reaction increases.
Greater is the activation energy, slower is the reaction. Therefore, reverse reaction, for the exothermic reaction, has a greater activation energy than the forward reaction. Therefore, the reverse reaction proceeds at a slower rate than the forward reaction.
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Equal volumes of propane, C3H8, and carbon monoxide, CO, at the same temperature?
a. the number of molecules
b. average molecular speed
c. the number of atoms
d. a and c
Please explain why or why not the answer is d. If the moles of a gas is constant, would not the number of molecules and atoms be the same? Also, please explain why b is incorrect.
Equal volumes of propane, C₃H₈, and carbon monoxide, CO, at the same temperature a) the number of molecules.
a) the number of molecules are same this is true. the ideal gas equation is given as :
P V = n R T
n = P V / R T
a mole of gas contains Avogadro's number of molecules . so, the number of molecules are equal.
b) average molecular speed is depends on the molar mass and the have different molar mass. so, this statement is not true.
c) the no. of atoms are same is also not true. because the propane contains 11 atoms per molecule and the carbon monoxide contains the only two atoms.
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Arrange these elements in order of decreasing electronegativity: Rank from largest to smallest. HelpReset Na,P,N,Al
N>P>Al>Na are the elements in decreasing order of electronegativity.
What is electronegativity ?
The propensity of an element's atom to draw a shared pair of electrons toward it in a covalent connection is known as its electronegativity.
What order do the components of electronegativity follow?
In the periodic table, electronegativity rises from left to right across a row, as in C, N, O, and F. (Nuclear charge rises from left to right, increasing the attraction of electrons.)In the periodic table, electronegativity decreases as you progress down a group, for example F > Cl > Br > I (As "new shells" of electrons are formed and the nuclear charge is further insulated by the core electrons, the atomic radii rise with each group down, which reduces the attraction of electrons.)The most electronegative element is F.Li and Mg are two metals that are less electronegative than carbon (i.e. Compared to C, metals are electropositive).To know more about Electronegativity, visit:
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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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the descriptions pertain to either prokaryotic or eukaryotic transcription. match each description to the appropriate category.
Prokaryotic transcription happens in the cytoplasm, where Eukaryotic transcription happens inside the nucleus. Proteins referred to as transcriptional factors are required for eukaryotic transcription but not for prokaryotic transcription.
What distinctions between prokaryotic and eukaryotic transcription quizlet exist?Eukaryotic cells carry out transcription in the nucleus and translation in the cytoplasm. Translation starts while the mRNA is still being created in a prokaryotic cell because transcription and translation are linked together during this process.
How does transcription in prokaryotes work?Prokaryotic transcription is the process by which the genetic material in prokaryotes is converted into messenger RNA transcripts, which are then translated to make proteins.
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list the n , l , ml , and ms states available for an electron in a 4 p subshell in order ( n , l , ml , ms ).
The orbitals 4px, 4py, and 4pz make up the 4p subshell. Each orbital can hold a maximum of two electrons, while the p orbital has a total of six electrons.
In the orbital 4p, the p stands in for the azimuthal quantum number, while the 4 stands for the main quantum number (n) (l).
For a 4p electron:
N and L are fixed quantum numbers. ml might be -1, -1, or +1.
This informs you that there are three 4p orbitals, as was already mentioned. The spin quantum number, ms, may equal 1/2.
The following six quantum number sets (n, l, ml, ms) are so possible:
1. (n, l, ml, ms) = (4, 1, -1, +1/2)
2. (n, l, ml, ms) = (4, 1, 0, +1/2)
3. (n, l, ml, ms) = (4, 1, +1, +1/2)
4. (n, l, ml, ms) = (4, 1, -1, -1/2)
5. (n, l, ml, ms) = (4, 1, 0, -1/2)
6. (n, l, ml, ms) = (4, 1, +1, -1/2)
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when the denominators of two terms in a partial fraction expansion are complex conjugates, the two associated ks are .
When the denominators of two terms in a partial fraction expansion are complex conjugates, the two associated Ks are (complex roots).
Definition of partial fraction
Partial fractions are defined as the fractions that are used for the decomposition of a rational expression. When any algebraic expression is splits into a sum of two or more rational expressions, then each part of the algebraic expression is called as a partial fraction.
We can apply lapcae and inverse laplace for finding the complex roots from its complex conjugates in a partial fraction.
Hence, when the denominators of two terms in a partial fraction expansion are complex conjugates then the two associated Ks are (complex roots).
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whats wrong with the following lewis structure
The diagram is erroneous if there is an imbalance between the number of electrons displayed in lewis structure and the number of valence electrons.
What causes the Lewis dot structure to fail?Fails to explain how a molecule is shaped. - It was unable to explain how energy was released when covalent connections were formed.
How do you tell which Lewis structure is correct?A genuine Lewis structure has been created if every atom from the second period and up has at least an octet, no element from the second period has more than an octet, and the total number of electrons in bonds and lone pairs equals the total number of valence electrons accessible.
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In terms of electron energy band structure, discuss reasons for the difference in electrical conductivity between metals, semiconductors, and insulators.
The number of electrons in the valence shell determines conductivity. Metals, for instance, have a gap in their valence shell. This makes it simple to stimulate electrons so they can switch bands. There are no open electron sites in the outer shell of semiconductors and insulators.
For this to happen, an electron must have sufficient energy to cross into a different band. Consequently, a wider gap must be filled, using more energy. The band gap of insulators is wider than that of semiconductors. Therefore, the conductivity of a material has a direct relationship with the band gap size.The ability of water to conduct an electrical current is measured by its conductivity. Conductivity rises with salinity because dissolved salts and other inorganic compounds carry electrical current. Oil and other organic materials have a low electrical conductivity in water because they do not conduct electricity well. Temperature also has an impact on conductivity; the higher the conductivity, the warmer the water. Conductivity is a helpful indicator of water quality in general.
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which of the following conclusions is most clearly supported by the representations of nucleic acid
Adenine-thymine base pairs can be found in nucleic acid #1 but they are absent from nucleic acid #2.
Nucleic acids are found where?Additionally to certain viruses, it is present in all cells. A wide range of tasks are performed by nucleic acids, including the production of new cells, the processing and storage of genetic data, the synthesis of proteins, and the production of energy cells.
The purpose of nucleic acidsThe genetic information contained in nucleic acids, including deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), is read by cells to produce the RNA and proteins necessary for life. This data may be replicated and passed on to the following generation thanks to the DNA double helix's well-known structure.
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there is a limit to the amount of fiber reinforcement that can be added to a fiber reinforced polymer because
The quantity of fiber reinforcement that can be added to a fiber reinforced polymer is limited since full strengthening requires that the fibers be thoroughly coated with the matrix.
Fiber Reinforced Polymer (FRP) has become one of the most popular methods in the repair and rehabilitation of concrete infrastructure due to its ease of application and the special physical characteristics.
Both destructive and nondestructive assessments have been used to test the durability of reinforced polymer in order to investigate the condition of the structure. Over the past 15 years, a relatively new class of non-corrosive, high-strength, lightweight materials have become useful materials for a variety of structural engineering applications.
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Lipids stored in adipose cells are released into the blood in the form of _______________ and transported in the blood bound to or part of ________________?A. Fatty acids; albuminB. Fatty acids; chylomicronsC. Fatty acids; apolipoproteinsD. Triacylglycerides; albuminE. Triacylglycerides; chylomicronsF. Acetyl-CoA; albuminG. Acetyl-CoA; apolipoproteins
Lipids stored in adipose cells are released into the blood in the form of Fatty acids and transported in the blood bound to or part of Albumin.Hence option A is correct.
What is lipids and its functions?All living cells are made up of lipids, which are fatty, waxy, or oily substances that are crucial to numerous bodily processes. Lipids aid in hormone regulation, nerve impulse transmission, organ cushioning, and the storage of energy in the form of body fat.
Phospholipids, sterols (which include the many types of cholesterol), and triglycerides—which make up more than 95% of the lipids in food—are the three primary categories of lipids. Fried foods, animal fats, and dairy products like cream, butter, and cheese contain higher levels of lipids than other dietary groups.
Lipids stored in adipose cells are released into the blood in the form of Fatty acids and transported in the blood bound to or part of Albumin. Hence option A is correct.
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What is the correct chemical name for Se9Br7?
Answer:
"biseleninum heptabromide ."which element is found in group 17 and period 2; where are the alkali metals on the periodic table; beryllium period number; where are the halogens found on the periodic table; group 2 periodic table; alkaline earth metals are located in what group on the periodic table; group 3 periodic table; a is an alkaline earth metal. if a loses two electrons to gain a complete octet
Location of groups periods and elements in the periodic table
What element is in group 17 and period 2?Fluorine (F)
Where are the alkali metals on the periodic table?in group 1
What is the period number of beryllium?2
Where are the halogens found on the periodic table?in group 18
What is group 2 of the periodic table?The alkaline earth metals
In which group on the periodic table are the alkaline earth metals found?in the 2
What is group 3 of the periodic table?That of the scandium family, also called that of rare earths and actinides
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What happens to elements and compounds that are dissolved ...
/yfhjfjhnfj kugj,hgbjh,kug kkgh,u,kghgvy, jtfg
When the water in a solution evaporates, elements and compounds that were dissolved in it crystallise.
What are substances and elements?
The pure versions of the chemicals that are found on the surface of the earth are known as chemical elements. There is a periodic table with 180 elements in it, and they are organised by increasing atomic number.
Oxygen and hydrogen combine to form the molecule known as water. Heat causes elements to crystallise when they come into touch with it.
A solution is a mixture in which one ingredient has been dissolved in another. When chemicals that are dissolved in water start to separate from the solution, crystallisation occurs. Minerals are created in this manner both underground and in aquatic bodies.
They turn to crystal.
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Use Hess's law to calculate AG° rxn using the following information.
CO(g) → C(s) + 1/2O2(g)
AG'Ixn = ?
CO₂(g) → C(s) + O2(g)
CO(g) + 1/2O2(g) → CO₂(g)
AG rxn=+394.4 kJ
AG rxn=-257.2 kJ
Answer:
AG rxn=+394.4 kJ
Explanation:
as you have just seen, the presence of one chirality center in a molecule causes it to not have a plane of symmetry. objects that lack a plane of symmetry are usually chiral. (the only exceptions are when they possess other symmetry elements such as a center or axis of symmetry.) which of the following molecules are chiral?
OH Go back to your original model (4 different colors) and make a second identical model of it: Make sure the two models are identical by trying to superimpose them; all of the atoms on one should superimpose on atoms of the same color in the other_ Now switch any two balls on one of the models and answer the following questions_ Are the models still superimposable? Are they identical? What is the word for non-identical structures that have the same molecular formula?
The molecules which are chiral are all of the atoms on one should superimpose on atoms of the same color in the other. Yes.
Yes, the model represents enantiomers. Because it has non-superimposable mirror image.
2. No
3. different
Yes the models are superimposable.Models represent identical structure.Models does not represent enantiomers. because the mirror images are superimposable.
Objects that possess plane of symmtery will never be chiral. Because one of the property of the chiral molecule is, it has no plane of symmetry or centre of symmetry. for example ,take our hand, it doesn't has the property of plane of symmetry. if a molecule possess plane of symmetry it will be an achiral molecule. When we split achiral molecule into two halves, one molecular half will be the exact reflection of the another half of the molecule.
In tetrahedral carbon, if the carbon bonds with four different groups or atoms there will be a symmetry lose. So that it is asymmetric.
3-methyl hexane possess plane of symmetry.
no chiral carbon present
4th carbon atom is chiral
The chiral carbon is present in 4th carbon atom
* All the models are not superimposable
*They are not identical
*Non identical structures with the same molecular formula are called enantiomers.
Baseball bat - Achiral
nail - Achiral
Baseball gloves - Achiral
Baseball - Chiral
Screw - Chiral
Spiral staircase - Chiral
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If a reaction is spontaneous as written, match the value of delta G, delta E, and K with their proper value
If a reaction is spontaneous then The value ∆G is negative,∆E is positive and Keq is greater than 1.
A spontaneous reaction is a chemical reaction that occurs without the addition of energy. This type of reaction is spontaneous because it is exothermic and releases energy into the surroundings.
Examples of spontaneous reactions include burning, rusting, and the decomposition of hydrogen peroxide
It is given that the reaction is spontaneous. Therefore we can assume that the Gibbs energy is negative for a spontaneous reaction. Then,
∆G = -nFEeq
And ∆E is given by rearranging as,
∆E = -nF/∆G
This indicates that ∆E is positive and its value is above zero whereas ∆G is negative and its value is less than zero.
Also, we know that
Keq = 10^-(∆GRT2.303)
Keq > 1
Therefore, the value of ∆G is negative,∆E is positive and Keq is greater than 1 for the spontaneous reaction.
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What do the different blocks on the periodic table represent?
There are four different blocks in the periodic table. These are S block, P block , D block and F block.
Blocks are the set of Elements in the periodic table grouped by their valence electron orbitals. Each block indicates which electron sublevel is in the process of being filled. S block elements are on the left side of the periodic table except helium. The p-block elements are on the right side of the periodic table. They include the last six element groups of the table. D-block elements display properties between those of the highly reactive electropositive s-block elements and the more electronegative p-block elements. This is why they are called “transition” metals. The f-block elements or inner transition metals are the lanthanides and actinides.
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how to determine whether each of the following compounds is ionic, covalent, or acidic. then write the name for each compound.
Ionic compound: Metal + Nonmetal (usually)
Ionic compound: metal + polyatomic ion (usually)
Covalent compound: Nonmetal + Nonmetal (usually)
covalent compound: hydrogen and a nonmetal (usually)
How can a substance be recognized as an acid?Acid: An chemical molecule is referred to as an acid when it dissolves in water or reacts with other chemicals to produce H+ ions. such as hydrochloric acid. H+ ions are produced in this chemical reaction by HCl. Thus, it is an acid.
What clues do the name and formula of an acid provide?In general, hydrogen comes first in the formula for an acid. If an acid only contains two components, it is known as hydro- -ic acid. Hydrochloric acid is an example of HCl. And HBr is the chemical formula for hydrobromic acid.
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