To form each of the monochlorination products shown, you will need to draw curved arrows that demonstrate the propagation steps. The first step is when a chlorine radical combines with the double bond to form a chlorine radical cation, which then donates an electron to the double bond.
This results in the formation of two radical chlorides, one on each carbon atom. These radicals then combine with two hydrogen atoms to form the monochlorination product, completing the reaction.The curved arrows for this process should be drawn as follows:
An arrow pointing from the chlorine radical to the double bond, representing the attack of the radical all arrows have been drawn, the monochlorination product has been formed. The mechanism of propagation steps to form each monochlorination product is shown in the following reaction:To represent this reaction, you can draw a curved arrow to show the movement of electrons from the bond to the chlorine. The arrow should start from the carbon-carbon double bond and point towards the chlorine.
Then, another curved arrow can be drawn to represent the formation of the C-Cl bond. The arrow should start from the chlorine and point towards the carbon with the unpaired electron.This process can be repeated to form the second monochlorination product. The following diagram shows the mechanism of the propagation steps:Here, you can see that the curved arrows are used to represent the movement of electrons during the reaction. The arrows point towards the atom that is gaining the electrons.
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Choose the correct answer.
The correct reaction equation is; Sr(OH)2 ----> Sr + 2OH
How do you know a correct reaction equation?A correct chemical reaction equation must follow the law of conservation of mass, which states that matter cannot be created or destroyed, only transformed from one form to another. This means that the total number of atoms of each element on the reactant side of the equation must be equal to the total number of atoms of each element on the product side.
To ensure that an equation is correct, you should first check that the chemical formulas of the reactants and products are correct. You can then balance the equation by adjusting the coefficients in front of each chemical formula so that the number of atoms of each element is the same on both sides of the equation.
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What is the meaning of friction
Explanation: the resistance that one surface or object encounters when moving over another.
or
the action of one surface or object rubbing against another.
Answer: a force that resists the motion of one object against another
Consider the reaction between aqueous solutions of potassium hydroxide and chromium (III) chloride. Based on your balanced equation for this reaction, answer the following questions: 1) What are the spectator ions in this reaction? and 2) What is the formula for the precipitate formed in this reaction? 3) What is the sum of all the coefficients in the net ionic equation for this reaction? Net lonic Equati....pdf Hydrocarbon C....pdf
The net ionic equation for the given reaction is: 1 Cr3+(aq) + 3OH-(aq) → Cr(OH)3(s)
2. The formula for the precipitate formed in this reaction is Cr(OH)3.
3. The sum of all coefficients in the net ionic equation is 4.
Consider the reaction between aqueous solutions of potassium hydroxide and chromium (III) chloride. The balanced chemical equation for the given reaction is:KOH(aq) + CrCl3(aq) → KCl(aq) + Cr(OH)3(s)1) Spectator ionsThe ions that do not take part in the reaction are known as spectator ions.
These ions are present on both sides of the equation without undergoing any chemical changes.The ionic equation for the given reaction is:3K+(aq) + 3OH-(aq) + Cr3+(aq) + 3Cl-(aq) → 3K+(aq) + 3Cl-(aq) + Cr(OH)3(s)The spectator ions are K+ and Cl-.2)
PrecipitateThe precipitate is formed when the two reactants are combined together, and it can be identified from the ionic equation. In this reaction, the precipitate is formed when KOH is added to the aqueous solution of chromium(III) chloride.The formula for the precipitate formed in this reaction is Cr(OH)3.3) Sum of all coefficientsThe net ionic equation represents the actual chemical change occurring in the reaction.
The spectator ions are removed, and only the ions that participate in the reaction are shown. The net ionic equation for the given reaction is:Cr3+(aq) + 3OH-(aq) → Cr(OH)3(s)The sum of all coefficients in the net ionic equation is 4.
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given the atomic mass of hydrogen is 1 amu, the atomic mass of oxygen is 16 amu, and one molecule of sulfuric acid has a mass of 98 amu, what is the atomic mass of sulfur trioxide?
The atomic mass of sulfur trioxide (SO3) is 82 amu.
How to find the atomic mass of sulfur trioxide ?Sulfur trioxide (SO3) has one sulfur atom and three oxygen atoms.
The atomic mass of sulfur can be calculated by subtracting the total mass of the oxygen atoms in sulfuric acid (3 x 16 amu) from the mass of sulfuric acid (98 amu) and then subtracting the mass of the remaining oxygen atom:
Mass of sulfur = (98 amu - 3 x 16 amu) - 1 x 16 amuMass of sulfur = (98 amu - 48 amu) - 16 amuMass of sulfur = 34 amuThe atomic mass of sulfur is 34 amu.
To find the atomic mass of sulfur trioxide, we add the atomic masses of one sulfur atom and three oxygen atoms:
Atomic mass of SO3 = 1 x 34 amu + 3 x 16 amuAtomic mass of SO3 = 34 amu + 48 amuAtomic mass of SO3 = 82 amuTherefore, the atomic mass of sulfur trioxide (SO3) is 82 amu.
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draw a mechanism showing the penta-coordinate intermediate and the formation of the phosphorylated intermediate (which is an anhydride)
The formation of the phosphorylated intermediate (an anhydride) involves the formation of a penta-coordinate intermediate. This intermediate is formed by a nucleophilic attack of the sulfur on the phosphorus atom of the phosphate group.
In this mechanism, the sulfur atom of the sulfate group nucleophilically attacks the phosphorus atom of the phosphate group to form a penta-coordinate intermediate. This intermediate then rearranges to form a phosphorylated intermediate, which is an anhydride.
Mechanism showing the penta-coordinate intermediate and the formation of the phosphorylated intermediate are given as follows:
Step 1: Alkyl Phosphate Formation : The first step of the mechanism includes the formation of an alkyl phosphate. A proton is abstracted by OH− from the phosphate group to create the alkyl phosphate. The base catalyzes this step.
Step 2: Binding to Mg2+After the alkyl phosphate is created, the magnesium ion binds to it.
Step 3: Nucleophilic attack: Following that, the nucleophilic attack happens, with the nucleophile being the water molecule. It is coordinated with the magnesium ion. It occurs at phosphorus, causing it to be phosphorylated. It results in the creation of a pentacoordinate intermediate.
Step 4: Release of Orthophosphate: Orthophosphate is released as a result of the reaction between pentacoordinate intermediate and water. It results in the creation of a diester intermediate.
Step 5: Subsequent Hydrolysis: In the final step, the intermediate diester is hydrolyzed to form orthophosphate and the final product. This is accomplished via nucleophilic substitution.
The end result is a free phosphate group that is bound to the alcohol's oxygen. A phosphate anhydride is formed in the process.
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18.35 mL of a solution of the acid H₂C₂O4 is titrated, and 58.20 mL of 0.4700-M NaOH is required to reach the equivalence point.
Calculate the original concentration of the acid solution.
The original concentration of the H₂C₂O4 solution is 0.7455 mol/L.
What is the original concentration of the acid solution?The balanced chemical equation for the reaction between H₂C₂O4 and NaOH is:
H₂C₂O4 + 2NaOH → Na₂C₂O₄ + 2H₂O
From this equation, we can see that the acid reacts with the base in a 1:2 ratio, meaning that one mole of H₂C₂O4 will react with two moles of NaOH.
To find the original concentration of the acid solution, we need to use the formula for calculating molarity:
Molarity = moles of solute / volume of solution (in liters)
We can start by calculating the number of moles of NaOH used in the titration:
moles of NaOH = Molarity x volume of NaOH used (in liters)
moles of NaOH = 0.4700 mol/L x 0.05820 L
moles of NaOH = 0.027354 moles
Since the acid and base react in a 1:2 ratio, we know that the number of moles of H₂C₂O4 is half the number of moles of NaOH used:
moles of H₂C₂O4 = 0.027354 moles / 2
moles of H₂C₂O4 = 0.013677 moles
Now we can use the formula for molarity to calculate the original concentration of the acid solution:
Molarity of H₂C₂O4 = moles of H₂C₂O4 / volume of H₂C₂O4 used (in liters)
Molarity of H₂C₂O4 = 0.013677 moles / 0.01835 L
Molarity of H₂C₂O4 = 0.7455 mol/L
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the electron configuration of nitrogen is 1s^2 2s^2 2p^3. how many electrons are present in an atom of nitrogen? what is the atomic number for nitrogen?
Since the electronic configuration of nitrogen is 1s² 2s² 2p³, the number of electrons present in the nitrogen atom is 7, and the atomic number of nitrogen is also seven (7).
The atomic number of an atom is the number of protons in the nucleus of an atom. The number of protons defines the properties of an element. For example, if an element with 5 protons is boron atom.
The electronic configuration of an atom represents the number of electrons in each sub-energy level of the atom in the ground state.
The electronic configuration of nitrogen is 1s²2s²2p³. As you know, the electrons around the nucleus are located in energies or levels. Therefore, from the definition of electron configuration, we can say that the nitrogen atom has 2 electrons in the first energy level K of the s-subshell, and in the s-subshell and the p subshell of the second energy level L, respectively There are 2 or 3 electrons.
Therefore, the total number of electrons in the nitrogen atom is 7 (2 + 2 + 3). We know that the number of protons = the number of electrons, so the number of protons in the nitrogen nucleus is 7. Therefore, the nitrogen atom has an atomic number of 7.
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When a mineral breaks along a weekly bonded plane it is called
Answer: Cleavage
Explanation:
When a mineral breaks along a weekly bonded plane it is called cleavage
Please help me Look at the picture below
The first two statements are false, whereas the last statement, which says that pressure and volume of a gas are inversely related, is true.
How are pressure and volume related to one another?Statement 1: This claim was incorrect because, according to the ideal gas law, PV=nRT, pressure (P) and volume (V) are inversely proportional to each other at a constant temperature (T) and amount of gas (n). This means that as pressure increases, volume decreases. This relationship is known as Boyle's law. Therefore, the statement that pressure has no effect on volume of a gas is false.
Statement 2: This claim was incorrect because, pressure and volume of a gas are inversely related according to Boyle's law, which states that at a constant temperature, the pressure of a gas is inversely proportional to its volume. This means that if the pressure of a gas increases, its volume will decrease, and if the pressure decreases, the volume will increase, as long as the temperature remains constant.
Statement 3: This claim was correct because, According to Boyle's law, the pressure and volume of a gas are inversely proportional to each other, which means that when the pressure of a gas increases, its volume will decrease and vice versa, as long as the temperature and the number of particles in the gas are kept constant. This relationship is expressed mathematically as P₁V₁ = P₂V₂, where P₁ and V₁ are the initial pressure and volume, and P₂ and V₂ are the final pressure and volume.
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Weigh magnesium metal Complete the following steps: Place weighing paper on balance Use forceps to place magnesium o balance. Record exact mass in Lab Data Calculate moles of magnesium. Record in Lab Data Use forceps to place magnesium on bench near wires and stopper 0.215 g TARE Mass of magnesium (g) Moles of magnesium (mol) Temperature of water (°C) Temperature of water (K) Vapor pressure of water (mmHg) Barometric pressure (mmHg) 0.198 9
Moles of magnesium = 0.198 g / 24.31 g/mol = 0.00815 mol
What are the moles?
Based on the given data, we can calculate the moles of magnesium using the following formula:
moles of magnesium = mass of magnesium (g) / molar mass of magnesium
The molar mass of magnesium is 24.31 g/mol.
Thus, moles of magnesium = 0.198 g / 24.31 g/mol = 0.00815 mol
It seems that the experiment involves determining the mass and moles of magnesium. The temperature of water, vapor pressure of water, and barometric pressure are likely additional data points collected during the experiment for further analysis.
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Identify each of the following orbitals, and determine the n and quantum numbers. Explain your answers.
(a) one radial node the Number of radial nodes = n - l - 1
And number of angular nodes = l
n = 3 and l = 1
Orbital is 3p.
(b) It has zero angular node hence s-orbital and there is 1 radial node . 1 = n - 0 - 1 ; n = 2 and l = 0
The orbital is 2s.
(c) the shape of the orbital is that of dz². There is two angular nodes and there is no radial node.
n = 3 and l = 2
Hence the orbital is 3dz².
What is radial node?In atomic physics, a radial node is a point in space where the probability density of finding an electron in an atom is zero. It is a type of nodal plane that occurs in atomic orbitals, which are regions of space where electrons are most likely to be found.
Radial nodes occur in the radial distribution function of an atomic orbital, which describes the probability density of finding an electron at a given distance from the nucleus. The number of radial nodes in an atomic orbital is equal to n - l - 1, where n is the principal quantum number and l is the azimuthal quantum number.
Radial nodes represent regions of space where the radial wave function of the electron changes sign.
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use the trendline equation in fig6.2 to determine the kelvin temperature at which the pressure equals .72 atm
When the pressure is 0.72 atm, the temperature in Kelvin is 156 K.
To determine the Kelvin temperature when the pressure is 0.72 atm, you will need to use the trendline equation given in Fig 6.2. First, find the equation of the trendline by using the graph's two points, (300 K, 1 atm) and (500 K, 2 atm).
The equation for the trendline is:
y = mx + b
Where y is pressure, x is the temperature in Kelvin, m is the slope, and b is the y-intercept. We can find the slope of the trendline by using the two points provided in the graph:
Slope (m) = (y2 - y1) / (x2 - x1)
Slope = (2 atm - 1 atm) / (500 K - 300 K)
Slope = 0.005 atm/K
The equation for the trendline can now be written: y = 0.005x + b. To find the y-intercept, b, we can use one of the two points: Solving for b:
1 atm = 0.005(300 K) + bb = 1.5 atm
Now we can use the equation for the trendline to find the temperature (x) at which the pressure (y) equals 0.72 atm:
0.72 atm = 0.005x + 1.5 atm
0.72 atm - 1.5 atm = 0.005x
-0.78 atm = 0.005xx
= -0.78 atm / 0.005x
= 156K
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what does 2NaOH equal
3. Draw a Lewis dot structure for the fictitious molecular ion [ZO2]-1. Assume that the central Z atom is bonded to each of the outer O atoms by a single bond. What is the formal charge on the Z atom?
The formal charge on the Z atom in the [ZO2]-1 ion is +1.
The Lewis dot structure for the [ZO2]-1 molecular ion is:
O
|
Z === O
|
O-
1. Determine the total number of valence electrons in the ion by adding the valence electrons of each atom and the charge of the ion.
Z has 4 valence electrons, while each O atom has 6 valence electrons.The ion has an overall negative charge of 1, so there is one extra electron.Total number of valence electrons = 4 + 6 + 6 + 1 = 172. Connect the Z atom to each O atom with a single bond, which uses up 2 electrons.
We now have 15 electrons left to distribute.3. Add the remaining electrons in pairs as lone pairs to each atom until all valence electrons are used up.
Each O atom needs 2 lone pairs (4 electrons).Z needs 2 lone pairs (4 electrons).4. Draw the Lewis dot structure.
The Lewis dot structure for [ZO2]-1 is:O
|
Z === O
|
O-
5. Calculate the formal charge on the Z atom using the formula:
Z has 4 valence electrons.Z has 2 lone pairs (4 electrons) and 2 bonding electrons (1 bond to each O).Formal charge = valence electrons - (number of lone pair electrons + 1/2 x number of bonding electrons)
Formal charge = 4 - (2 + 1/2 x 2) = 4 - 3 = +1
Therefore, the formal charge on the Z atom in the [ZO2]-1 ion is +1.
What is valence electron?
A valence electron is an electron in the outer shell associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed.
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match each substance correctly to the principal type(s) of intermolecular force(s) present, other than covalent bonding.
Substance intermolecular force
CH2OH ---> Hydrogen bonding
CH3F --> Dipole-dipole forces
C3H8 --> Dispersion forces
CaCL2 --> Ionic bonding
The intermolecular force present in CH2OH is hydrogen bonding. The intermolecular force present in CH3F is Dipole-dipole forces. Ionic bonding is defined as a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions or between two atoms with sharply different electronegativities. It is the primary interaction occurring in ionic compounds. Hydrogen bonding results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom.
Dipole-dipole forces are defined as a attractive forces between the positive end of one polar molecule and the negative end of another polar molecule. Dispersion force is defined as a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles.
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The complete question is,
Match each substance correctly to the principal type(s) of intermolecular force(s) present, other than covalent bonding.
CH2OH Ionic bonding
CH3F Hydrogen bonding
C3H8 Dispersion forces
CaCL2 Dipole-dipole forces
what is the formula for co3+ and se2-?
The formula for Co3+ is Co3+ because it represents the ion of cobalt that has lost three electrons, leaving it with a 3+ charge.
What is chemical formula and how they are formed ?
A chemical formula is a symbolic representation of a chemical compound that shows the types of elements present in the compound and the relative number of atoms of each element. For example, the chemical formula for water is H2O, which indicates that it is made up of two hydrogen atoms and one oxygen atom.
Chemical formulas are formed by identifying the elements that make up a compound and determining the relative number of each element in the compound. The number of each element is represented by a subscript following the chemical symbol of the element. For example, the chemical formula for methane is CH4, which indicates that there is one carbon atom and four hydrogen atoms in each molecule of methane.
The formula for Se2- is Se2- because it represents the ion of selenium that has gained two electrons, giving it a 2- charge.
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Seventy five percent of a compound is carbon. If you have 250 grams of this particular compound, how much carbon is contained?
Answer:
The compound has 187.5 g. of Carbon
Explanation:
If the 100% of the compound is 250 gr, then you can calculate the 75% of it by multiplying:
Amount of Carbon = (75%) 250 g.
75%= 0.75
250 (0.75)
= 187.5 g.
1. Choose the atom with the larger first ionization energy.
Select one:
a. Titanium
b. Manganese
2. Choose the atom with the larger first ionization energy.
Select one:
a. Silicon
b. Tin
The atom with the larger first ionization energy is Titanium. Option a.
The atom with the larger first ionization energy is Tin. Option b.
Ionization and ionization energyIonization is the process of removing one or more electrons from an atom or molecule, resulting in the formation of an ion. This can be achieved through a variety of methods, such as exposure to high-energy radiation or contact with other charged particles.
Ionization energy is the amount of energy required to remove an electron from a neutral atom or molecule, resulting in the formation of a positively charged ion. This energy is typically measured in electron volts (eV) or kilojoules per mole (kJ/mol), and varies depending on the identity of the atom or molecule and the electronic configuration of its valence shell. Ionization energy is an important property of atoms and molecules, as it can provide insight into their reactivity and chemical behavior.
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value: 4
Which of the following energy types are used in medical imaging process?
Light,heat,chemical, radiation
Answer:
radiation is the answer
which of the following is the correct electron configuration for tc? select the correct answer below: [kr]5s24d5 [kr]4d7 [kr]5s24d2 [kr]5s25d5
The correct electron configuration for Tc (technetium) is [Kr] 5s² 4d⁵. Therefore, the correct answer is: [kr]5s²4d⁵.
What is technetium?Technetium (Tc) is a radioactive chemical substance with the atomic number 43 and symbol Tc. It is a silvery-gray metal that belongs to the transition metals group on the periodic table. Technetium is the first element to be artificially produced, and all of its isotopes are radioactive, with no stable isotopes. It is a highly toxic and dangerous element, and therefore has no significant commercial applications. Technetium has many nuclear and medical applications due to its radioactivity, and is used in medical imaging, cancer treatment, and scientific research.
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Answer:
C
Explanation:
edg 2023
How does a phase change affect a thermochemical equation?
O It alters the products.
O It alters the moles of reactants.
O It affects the balance of the equation.
O It can affect the AH value.
The correct answer is option D, It can affect the AH value.
What is a phase change?A phase change is a physical change in a substance in which the substance's state of matter is changed, such as from a gas to a liquid or from a liquid to a solid. It is also known as a phase transition.
Phase changes also involve changes in energy, temperature, and pressure. For example, when a solid melts to become a liquid, it absorbs energy and the temperature rises. When a liquid boils to become a gas, energy is released and the temperature decreases. Similarly, when a gas condenses to become a liquid, energy is released and the pressure increases.
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For the partially completed Lewis structures, pick the correct Lewis structure.
How many Valence Electrons total overall?
The correct Lewis structures of the compounds that we have in the question have been shown in the images attached.
What is the Lewis structure?A Lewis structure is a diagram that shows the bonding between atoms in a molecule and the arrangement of electrons around the atoms. It is also known as a Lewis dot structure, Lewis dot diagram, or electron dot structure.
Lewis structures are useful in predicting the geometry of molecules and determining the polarity of molecules. They are also helpful in understanding the reactivity of molecules and how they interact with other molecules.
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Which of the following are volume ratios from this equation? Select all that apply.
2H2 + O2 --> 2H2O
The volume ratios from the equation 2H2 + O2 → 2H2O are:
2 L H2 : 1 L O2 (or 2 mol H2 : 1 mol O2)1 L O2 : 2 L H2O (or 1 mol O2 : 2 mol H2O)The coefficients in a balanced chemical equation give the ratio of moles of reactants and products. From the equation 2H2 + O2 → 2H2O, we can see that:
2 moles of H2 react with 1 mole of O2 to produce 2 moles of H2O.Therefore, the following volume ratios are valid:
2 L H2 : 1 L O21 L O2 : 2 L H2OWhat are the reactants?
The reactants are the substances that participate in a chemical reaction and are consumed to form new products. In the equation 2H2 + O2 → 2H2O, the reactants are hydrogen gas (H2) and oxygen gas (O2). These reactants undergo a chemical reaction to form water (H2O) as the product.
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please answer the question for BRAINLIEST asap
Using the formula M1V1 = M2V2 , if I add water to 100.0 mL of a 0.15 M NaOH solution until the final volume is 150 mL, what will the molarity of the diluted solution be?
Question 3 options:
0.23M
1.0M
0.10M
1.0E5M
Answer:
M2= 0,1 M
Explanation:
M1=0,15 M
V1= 100 mL =0,1 L
M2= ?
V2= 150 mL = 0,15 L
M1V1= M2V2
(0,15 mol/L) (0,1 L) = M2 (0,15 L)
0,015 mol / 0,15 L = M2
M2= 0,1 M
What kind of scientist would study the effects of acid rain on marble statues? A. A physicist B. A biologist C. A chemist D. An economist
Scientists would research the impacts of marble monuments and acid rain. A chemist. Hoping this is useful.
The correct answer is :C.
What are the substances that change the earth's surface?Surface sediments are transported and large stones are broken up through wind, water, and ice. Years are often needed for weathering, erosion, and deposition to cause noticeable changes. Nonetheless, certain things change the Planet's surface far more quickly than others. Extreme events, earthquakes, and volcanic eruptions are a few of them.
What adjustments to the Planet's surface may rain makes?Weathering and erosion caused by water movement change the properties of the terrain. Regional wind patterns and climate are defined by several interactions, including the role of the ocean. The unique physical and chemical properties of water have a profound effect on the planet's dynamics.
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Using C2H4 + 3 O2 -> 2 CO2 + 2 H2O. If 20 moles of fuel are combusted in the above equation, how many moles of CO2 are produced?
Which of the following molecules is drawn in a conformation that has a proton and a leaving group anti-periplanar? H₂C, Br Ph. H CH3 Br H H₂C Br H₂C Ph H₂C CH3 H Ph H₂C, Br H Ph Save for Later CH3 CH3 CH3 CH3 CH3 Sul
The molecule that is drawn in a conformation that has a proton and a leaving group anti-periplanar is H₂C, Br.
The A, B, C, and D bond angles of a molecule are referred to as anti-periplanar, or antiperiplanar, in organic chemistry. The dihedral angles of the A–B and C–D bonds in this conformer are larger than +150° or less than 150°. In textbooks, the term "anti-periplanar" is frequently used to refer to a strictly anti-coplanar structure with a 180° AB CD dihedral angle. The anti-periplanar functional groups will be 180° apart from one another and in a staggered configuration in a Newman projection of the molecule.
Conformation is an essential factor in predicting reactivity in organic molecules. The anti-periplanar conformation of a molecule is one that occurs when two atoms in a molecule are in the same plane and are separated by 180 degrees. In this case, the proton and leaving group are placed in a perpendicular plane to the atoms directly in between them. This is the most stable conformer of the molecule. A significant factor in predicting reactivity in organic molecules is conformation. In this case, the molecule H₂C, Br is drawn in a conformation that has a proton and a leaving group anti-periplanar.
Therefore, the correct option is H₂C, Br.
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What is the name in a position called
The names of the positions are called:
(1) (10) Atomic number
(2) (11) Chemical symbols
(3) (12) Elements
(4) (13) Atomic mass
What is an atomic structure?Atomic structure refers to the composition and arrangement of subatomic particles within an atom. An atom consists of a central nucleus, which contains positively charged protons and uncharged neutrons, surrounded by negatively charged electrons that move around the nucleus in shells or energy levels.
The number of protons in the nucleus determines the atomic number and thus the identity of the element. The arrangement of electrons around the nucleus determines the chemical and physical properties of the element.
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The questions are:
10 What is the name for the number in this position called? (the answer is not "6") →6
11 What is the name for the letter in this position called? (the answer is not "C"!) →C
12 What is the name in this position called? (the answer is not "Carbon"!) →Carbon
13
What is the name for the number in this position? (the answer is not "12.0") →12.0
Use the spaces below to type your answers to the questions above.
Q10. Hydrocarbon molecules can react with halogens like Cl2 or Br2 (represented generically by X2) where C-H bonds are replaced by C-X bonds, forming HX molecules in the process. Balance the following chemical reaction and compute the estimated heat of reaction using the values above.
C3H8(g) + X2(g) → C3H2X6(g) + HX (g)
You are given the following average bond energies:
H-H 436 kJ/mol
H-X 431 kJ/mol
H-C 414 kJ/mol
C-X 339 kJ/mol
X-X 243 kJ/mol
Answer: To balance the given chemical equation, we can start by counting the number of atoms on both sides of the equation. We have 3 carbon atoms and 8 hydrogen atoms on the left side, and 3 carbon atoms, 6 X atoms, and 1 hydrogen atom on the right side.
C3H8(g) + X2(g) → C3H2X6(g) + HX(g)
To balance the equation, we can add a coefficient of 3 in front of HX on the product side:
C3H8(g) + X2(g) → C3H2X6(g) + 3HX(g)
Now, we have the same number of H atoms on both sides (8 H atoms on each side), and the equation is balanced.
To estimate the heat of reaction, we can use the bond energy values to calculate the energy required to break the bonds in the reactants and the energy released by forming the bonds in the products. We can then subtract the energy required to break the bonds from the energy released by forming the bonds to obtain an estimate of the heat of reaction.
Breaking bonds in the reactants:
3 C-H bonds × 414 kJ/mol = 1242 kJ/mol
1 X-X bond × 243 kJ/mol = 243 kJ/mol
Forming bonds in the products:
6 C-X bonds × 339 kJ/mol = 2034 kJ/mol
1 C-H bond × 414 kJ/mol = 414 kJ/mol
3 H-X bonds × 431 kJ/mol = 1293 kJ/mol
Estimated heat of reaction:
Energy released - energy required
(2034 kJ/mol + 414 kJ/mol + 1293 kJ/mol) - (1242 kJ/mol + 243 kJ/mol) = 2756 kJ/mol
Therefore, the estimated heat of reaction for the given chemical equation is 2756 kJ/mol. Note that this is only an estimate and actual experimental values may differ due to factors such as reaction conditions and the presence of catalysts.
Question 8 of 10
Which of the following diagrams is the correct electron dot diagram for Al?
O A.
OB.
О с.
O D.
..
•Al:
:AI:
•AI.
:AI.
Please help I need it asap!!!
Answer:
The correct electron dot diagram for Al is option A:
•Al:
:AI:
Explanation:
