The Raynaud phenomenon has a type iii hypersensitivity reaction mechanism in which immune complexes are deposited in tissues after antibodies bind to soluble antigens and are released into bodily fluids.
What Raynaud syndrome mechanism is categorized as a type iii hypersensitivity reaction?Immune complexes, which are lattices of antibodies and antigen, are formed when antibodies react to soluble antigen. Immune complexes (IgG or IgM), which are typically cleared by macrophages in the spleen or liver, become too numerous to be handled by these protective mechanisms.
Antigen-antibody aggregates known as "immune complexes," which are mediated by aberrant immunological responses in type III hypersensitivity reactions.
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25 Which of the following is considered an atomic solid? Fz (s) b. CsBr cN, (s) d.Nb (s)
From following compound F₂ , CsBr, CN, Nb. The compound that's considered as an atomic solid is Nb. the correct answer is D.
what is atomic solidAtoms of an element must be bound to other atoms of the same atom type in order for a substance to be considered an atomic solid.
Hydrogen and fluorine gases, abbreviated H₂ and F₂, are present at normal temperature. Atomic solids include things like pure metals, silicon crystals, and diamond. Atomic solids known as network solids have covalent bonds between their constituent atoms.
The atomic number 5 and symbol of the chemical element boron are B. In its solid state at ambient temperature is the metalloid boron.While some would refer to it as a molecule, it is essentially a concoction of atoms and not an atom. The most common ingredient in air, N2, is a gas, as can be seen by looking at it. So, that is not a solid. A diatomic gas is element 35, bromine (Br).
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if 70% of a radioactive element remains radioactive after 900 years, then what percent remains radioactive after 2000 years?
If 70% of a radioactive element remains radioactive after 900 years, then 28 percent remains radioactive after 2000 years.
Formula for exponential decay, which describes the percentage of a radioactive element that remains after a given time period. The formula is:
= P = P0 x e^(-lambda t)
where P is the percentage of the radioactive element that remains after a time period t, P0 is the initial percentage of the radioactive element, lambda is the decay constant for the element, and e is the base of the natural logarithm (approximately 2.718).
In this problem, you are given that P0 = 70% and t = 900 years. You want to solve for P at t = 2000 years.
Values into the formula and solving for P, we get:
= P = 70% x e^(-lambda x 2000 years)
= 70% x e^(-lambda x 900 years)
= 70% x 0.4
= 28%
Therefore, if 70% of a radioactive element remains radioactive after 900 years, then 28% remains radioactive after 2000 years.
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Which one of the following is NOT a strong electrolyte? A) LiOH B) HNO3 C) KBr D) NH4CI E)HNO2
Among the given options, formic acid is not an example of strong electrolyte and it is a weak electrolyte and it is a weak carboxylic acid.
Which are not strong electrolytes?
HCOOH is a weak electrolyte. Rest all are strong acids and they completely disassociates into ions.
Is HCl not a strong electrolyte?
Hydrogen chloride is a strong electrolyte, and it dissolves in water completely to form Hydrogen ions and chlorine ions.
Is NH4OH a strong electrolyte?
NH4OH is a weak electrolyte as it is only slightly ionize or dissociates in water. Hence, it does not dissociate completely into ions and value of Kb is low.
What are the 7 weak electrolytes?
Weak Electrolytes and their Examples
Examples of weak electrolytes include acetic acid (CH3COOH), carbonic acid (H2CO3), ammonia (NH3), hydrogen fluoride (HF), hydrogen cyanide (HCN), and pyridine (C2H5N), etc
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how would you make 1 liter of an aqueous solution with a 0.50 m concentration of a compound that has a molecular weight of 200 grams? explanation
Hence 3.011*10²³ molecules are present in 1 liter of solution .
Molecular weight of compound = 200 grams
molecular weight of compound is weight of 1 M concentration of compound .
1M conc of compound has = 200 grams
molecular weight .
0.5 conc of compound has molecular weight = 200gram/2 = 100 gram
Hence 0.5 conc of compound means 100 gram of compound
As it is an aquous solution , thus means in order to make 1 liter 100gm of compound has to be added to 1000 ml of water to make 1 liter.
This means 100 gram of compound and add water until volume is 1 liter
In order to calculate number of molecules
No of molecules = Number of moles * avogardo constant
Avogardo constent = 6.022*10²³
as concentration of solution is 0.5 M
No of molecles = 0.5*6.022*10²³
= 3.011*10²³
Hence 3.011*10²³ molecules are present in 1 liter of solution .
A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds. Depending on the context, the term may or may not include ions that meet this criterion.[4][5][6][7][8] In quantum physics, organic chemistry and biochemistry, ions The distinction between is removed and molecule is often used when referring to polyatomic ions.
Molecules can be isonuclear. H. Consists of atoms of chemical elements. Two atoms in the oxygen molecule (O2). Or it may be heteronuclear, which is a compound composed of multiple elements. Water (2 hydrogen atoms and 1 oxygen atom; H2O). In gas dynamics theory, the term molecule is often used for gas particles, regardless of their composition. This relaxes the requirement that molecules contain more than one atom, since noble gases are single atoms . Atoms and complexes held together by non-covalent interactions, such as hydrogen bonds and ionic bonds, are generally not considered single molecules.
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a 4.18 g sample of a hydrocarbon is combusted in a bomb calorimeter that contains 974 g of water. the temperature of the water increases by 6.9 oc when the hydrocarbon is combusted. the calorimeter constant for the calorimeter was determined to be 624 j/oc. what is the heat of the reaction, in kj, when 4.18 g of the hydrocarbon are combusted? ch2o(l)
The heat of the reaction, in kJ, when 4.18 g of the hydrocarbon are combusted 775.70 kJ.
The heat energy is given as :
q = m c ΔT + Ccal ΔT
q = ( 974 g× 4.184 ×6.9) + 624 ×6.9
q = 32424.59 J
moles of hydrocarbon = 0.0418 mol
heat of combustion = 32424.59 J / 0.0418 mol
= 775707.89 J
= 775.70 kJ
Thus, A 4.18 g sample of a hydrocarbon is combusted in a bomb calorimeter that contains 974 g of water. the temperature of the water increases by 6.9 °C when the hydrocarbon is combusted. the calorimeter constant for the calorimeter was determined to be 624 J/°C. what is the heat of the reaction is 775.70 kJ.
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g does fission of light or heavy elements produce the most energy per mole of the given isotope? explain by discussing mass defect and nuclear binding energy.
Depending on the element's atomic number, fusion provides significantly more energy for lighter elements than fission does for heavier ones.
The term "binding energy" is the key to comprehending this. The combined mass of protons and neutrons in a nucleus, when they are held together by the strong force, is always less than the combined mass of the same number of unbound protons and neutrons.
The mass disparity is transformed into energy when two light nuclei combine to form a heavier nucleus. This means that to cause the nucleus to disintegrate, the same amount of energy must be added.
The issue is that a lot of energy is released when hydrogen and helium are fused together. Less energy is released when heavier elements are fused.
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given that the delta g value for a particular reaction is negative what can be said about relative portions of reactants and products when the reaction reaches equilibrium
When delta G value for a particular reaction is negative, then we can say that : there are fewer reactant molecules and then product molecules.
What is the characteristic of reaction if Delta G is negative?A negative ∆G means that reactants have more free energy than the products. Exergonic reactions are also called spontaneous reactions, as they can occur without addition of energy.
When used in a reaction, delta G is the difference in free energy between products and reactants. If this value is negative, then the reaction is spontaneous and if it is positive, then the reaction is non-spontaneous. If it is zero, then the reaction is at equilibrium.
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Is 1-methylpropane a correct way of naming butane?
No, because it IS butane.
1-methylpropane says that: Three carbons are in the main chain ("prop-").
Thus, they are not different isomers (whether they're constitutional, conformational, stereochemical, etc). They are identical compounds.
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Draw the Lewis structure of IF4+ and then answer the following questions about it.
What is its steric number? [ Select ] ["0", "1", "2", "3", "4", "5", "6"]
What is the electron group geometry? [ Select ] ["linear", "trigonal planar", "tetrahedral", "trigonal bipyramidal", "octahedral"]
What is the molecular geometry? [ Select ] ["linear", "trigonal planar", "bent", "tetrahedral", "trigonal pyramidal", "trigonal bipyramidal", "see saw", "T-shaped", "octahedral", "square pyramidal", "square planar"]
What is the hybridization of I? [ Select ] ["sp", "sp2 (the 2 should be superscript)", "sp3 (the 3 should be superscript)", "sp3d (the 3 should be superscript)", "sp3d2 (the 3 & 2 should be superscript)"]
Is the molecule polar? [ Select ] ["yes", "no"]
How many sigma bonds are in the molecule? [ Select ] ["0", "1", "2", "3", "4", "5", "6"]
How many pi bonds are in the molecule? [ Select ] ["0", "1", "2", "3", "4", "5", "6"]
A total of 36 valence electrons make up the IF4: seven from the iodine atom, seven from each of the four fluorine atoms, and one from the negative charge. Iodine will serve as the main atom. Four single bonds will be created with fluorine atoms, totaling 8 of the 36 available valence electrons.
Does the planar square shape of if 4 exist?
Hybridization is therefore [sp3d2], and although the molecule has an octahedral structure, the atom's geometry is square planar because iodine carries two lone pairs of electrons, one above and one below the plane. As a result, the molecule has a square planar shape.
What is water's steric number?
In the case of water, the central oxygen atom possesses two non-bonding pairs and is connected to two hydrogen atoms. The steric number for water is 4, which is calculated as the sum of the number of atoms linked to the central atom plus the number of non-bonding pairs.
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a 10.0 gram piece of metal is placed in an insulated calorimeter containing 250.0 g of water initially at 20.0 o oc. if the final temperature of the mixture is 25.0 o oc, what is the heat change of water?
A 10.0 g piece of metal is placed in an insulated calorimeter containing 250.0 g of water initially at 20.0 °C. If the final temperature of the mixture is 25.0 °C, the heat change of water will be 5230 J.
Weight of metal = 10.0 g
Weight of water = 250.0 g
Initial temperature of water (Ti) = 20.0 °C
Final temperature of water (T2) = 25.0 °C
The specific heat capacity of water is 4.184 J/g.°C
We can calculate the heat change of water by the following equation;
Q = mwater × Cwater × (T2-Ti)
Q = 250.0 g × 4.184 J/g.°C × (25.0 - 20.0) °C
Q = 5230 J
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The energy that an object has due to its motion is called, a. gravitational potential energy. b. elastic potential energy. c. kinetic energy. d. thermal energy.
Kinetic energy is the form of energy that a moving body possesses. When kinetic energy is released into motion by gravity or any other force, potential energy is converted into kinetic energy.
Energy is omnipresent. However, we are aware that energy cannot be created or destroyed according to the rule of conservation of energy. However, we are aware that energy can only be transformed from one type of energy to another.
Energy is the definition of the ability to perform work of any kind. Mass and energy are inversely related. This is apparent from the Mass-Energy Equivalence.
E=mc2
It's stated that a body at rest has potential energy. In contrast, when an object is moving, it possesses kinetic energy.
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What are two qualities of metals? Describe each
Answer:Typical physical properties of metals : high melting points. good conductors of electricity. good conductors of heat.
Explanation:
Draw the electron configuration for neutral atom of titanlum_ energy
The electronic configuration of the neutral atom of titanium is =
⇒ [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{2}[/tex]
According to the question we need to draw the electron configuration of the titanium neutral atom,
First, let us study the concept of electron configuration.
Electron Configuration -
When the electrons are arranged in the atomic orbitals then the phenomenon is called electron configuration. It shows the number of electrons.Unlike the orbital system, it does not show information on the spin of electrons.We will be deriving the electron configuration of titanium with the help of an orbital diagram.
Orbital Diagram -
Representation of the arrangement of electrons in the atom's orbit.It represents electrons in the arrow form.It also tells about the spin of the electrons.For the filling of the electrons to derive the electron configuration of the Titanium atom we will be using the Aufbau principle -
Refer to the attached file that indicates the orbital diagram for the titanium neutral atom,
The filling of the electrons will be in the order -
⇒ 1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s < 4f < 5d < 6p < 7s < 5f < 6d < 7p
Now if we talk about the titanium neutral atom it has a total of 22 electrons,
Therefore, according to the given figure, the electron configuration of the Titanium neutral atom is = [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{2}[/tex]
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The frequency of electromagnetic waves is measured in what units? What does this unit mean?
The frequency of electromagnetic waves is measured in Hertz(Hz).
What is Hertz?
Hertz (symbol: Hz) is the frequency unit in the International System of Units (SI), equal to one event (or cycle) per second. Hertz is an SI-derived unit whose expression in SI-based units is s−1, meaning that 1 Hertz is the reciprocal of 1 second [2]. It is named after Heinrich Rudolf Hertz (1857–1894), who was the first to conclusively prove the existence of electromagnetic waves. Hertz is usually expressed in multiples of kilohertz (103 Hz, kHz), megahertz (106 Hz, MHz), gigahertz (109 Hz, GHz), and terahertz (1012 Hz, THz). Some of the most common uses of the device are to describe sine waves and musical tones, especially those used in radio and audio applications. It is also used to describe the clock speed at which computers and other electronic devices operate. Units are also used as a representation of photon energy via the Planck relation E = hν. where E is the photon's energy, ν is its frequency, and the proportionality constant h is Planck's constant.
Therefore, The frequency of electromagnetic waves is measured in Hertz(Hz).
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■) Explain why the mass of 1 mol of zinc differs
from the mass of 1 mol of sulfur.
Answer:
A big load of icecream/ loaded cake.
Explanation:
Freckles are dominant (F) over no freckles (f). If both parents are heterozygous. Determine the genotype and phenotype ratios. (5 points)
Answer: If both parents are heterozygous for freckles, then they each have a genotype of Ff. This means that each parent has one dominant allele for freckles and one recessive allele for no freckles. When these two parents mate, their offspring will have a genotype that is a combination of the genotypes of the two parents.
Explanation:
There are four possible combinations of genotypes that the offspring could have: FF, Ff, ff, and Ff. The first three genotypes are possible because each parent has a 50% chance of passing on each of their two alleles to their offspring. The fourth genotype, Ff, is possible because the offspring could inherit one F allele from one parent and one f allele from the other parent.
The genotype ratios for the offspring of these two heterozygous parents would be 1:2:1. This means that there is a 25% chance that an offspring will have the genotype FF, a 50% chance that it will have the genotype Ff, and a 25% chance that it will have the genotype ff.
The phenotype ratios for the offspring of these two heterozygous parents would be 3:1. This means that 75% of the offspring will have freckles, and 25% of the offspring will not have freckles. This is because the genotypes FF and Ff both result in the freckles phenotype, while the genotype ff results in the no freckles phenotype
place the following molecules in order of decreasing bond angle: nh3, co2, ccl4, of2
molecules in order of decreasing bond angle:CO2 > CCl4 > NH3 > OF2
Bond angle is referred to as the angle between two bonds, or the angle between two orbitals surrounding the central atom in a complex molecule or ion that include bonding electron pairs. The spectroscopic approach is used to calculate it and it is expressed in degrees. Three linked nuclei in a molecule form an angle called a bond angle. Conventionally, the bond angle is thought to range from 0° to 180°. The angles and topologies of electron domains are distinctive. With a bond angle of 180°, for instance, a center atom with two zones of electron density is regarded as linear.
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The conjugate acid of CH3COO- is _____________. The conjugate acid of F- is _______________. The conjugate acid of CN- is ______________. The conjugate acid of PO43- is _____________.
The conjugate base of CH3COOH is _________________. The conjugate base of HCl is ______________. The conjugate base of H2SO4 is _________________. The conjugate base of H2S is _______________. The conjugate base of H3PO4 is _________________. The conjugate base of NH4+ is ___________________.
Na2HPO4 is soluble and exists in two units of the cation Na+ and one unit of the anion __________________. The conjugate base of this anion is _____________________. Na3PO4 is soluble and exists in three units of the cation Na+ and one unit of the anion ___________________. The conjugate acid of this anion is __________________.
The conjugate acid of CH3COO- is CH3COOH, The conjugate acid of F- is HF , The conjugate base of CH3COOH is CH3COO-, The conjugate base of HCl is Cl-, The conjugate base of H2SO4 is HSO4-, The conjugate base of H3PO4 is H2PO4-, The conjugate base of NH4+ is NH3, Na2HPO4 is soluble and exists as two units of Na+ and one unit of HPO4^2-, Na3PO4 is soluble and exists as three units of Na+ and one unit of PO4^3-, the conjugate acid of this anion is HPO4^2-
According to the Brnsted-Lowry acid-base theory, a conjugate acid is a chemical that is created when an acid donates a proton (H +) to a base; in other words, it is a base that has had a hydrogen ion added to it, as in the opposite reaction, the base loses a hydrogen ion. When an acid gives up a proton, it transforms into a base, and when a base takes one on, an acid is created. A conjugate acid-base pair is made up of an acid and a base that only differ by whether a proton is present or not.
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which of the following molecules has th emost energy? carbon dioxide, water, clucose, ocygen gas
Answer:
carbon dioxide
Explanation:
hope i helped
The molecule that has the most energy is carbon dioxide. The correct option is a.
What is energy?Energy can be internally transformed into any other kind of energy, even if it cannot be created or destroyed in an isolated system.
Nuclear reactions release energy that heats the steam that turns a turbine, producing electricity. The formula "KE + PE = const" can be used to express the conservation of mechanical energy.
Through a variety of conversion processes, carbon dioxide can be used to create fuels and chemical intermediates, but doing so requires a large amount of energy.
Natural gas carbon dioxide is a byproduct of many energy production processes and is essential to the carbon cycle for life. Additionally, it is a greenhouse gas.
Therefore, the correct option is a. carbon dioxide.
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Draw a Lewis structure for BrCl5 . What is the molecular geometry around the central atom in the Lewis structure?
The BrCl5 Lewis structure comprises an octahedral electron geometry and a square pyramidal molecular shape. Five bonds hold the core bromine atoms together.
What is the molecular geometry of the main atom in the compound?When the center atom possesses one or more lone pairs of electrons, the molecular geometries of the molecules alter. What is referred to as the electron domain geometry is determined by the overall number of electron pairs, including bonded pairs and lone pairs.
What atom serves as the center of a Lewis structure?The center atom in a molecular formula is often the atom with the lowest subscript and the largest bonding potential. The least electronegative atom is normally the central atom when all the atoms typically make the same number of bonds.
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how many molecules of co 2 can be formed when three molecules of c 4h {10} are mixed with thirteen molecules of o 2 and the combustion reaction leads to the formation of co 2 and h 2o?
2C4H10 + 13O2 → 8CO2 + 10 H20
6.022 ×[tex]10^{24}[/tex] molecules of H2O
Moles of C4H10 = 3 moles of O2 = 13
O2 is limiting reagent
Moles of H2O = 10/13 × moles of O2
= 10/13 × 13 = 10 MOL H2O = 6.022 ×[tex]10^{24}[/tex] molecules of H2O
The tiniest component of an object that possesses all of its physical and chemical characteristics. The number of atoms that make up a molecule might vary. If they do, the additional atoms may be of the same type (for example, an oxygen molecule contains two oxygen atoms) or distinct types (a water molecule has two hydrogen atoms and one oxygen atom). Many thousands of atoms can make up biological compounds like proteins and DNA.
Molecular oxygen can be found in nature. To create dioxygen, often known as O2, two oxygen atoms form a covalent double bond. As a molecule, oxygen is typically present. Dioxygen is its name
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List modern evidence of Wegener’s Theory of Plate Tectonics.
Answer: proposed that the continents were like icebergs floating on heavier crust.
Explanation:
What kind of intermolecular forces act between two carbon disulfide molecules? Note: If there is more than one type of intermolecular force that acts, be sure to list them all, with a comma between the name of each force.
Two molecules of carbon disulfide are held together by nonpolar intermolecular interactions. The C-S bond is nonpolar because C and S have different electronegativities.
Two bond dipoles in opposite orientations in the linear structure of carbon disulfide balance out the dipole moments. Having the chemical symbol C and atomic number 6, carbon is an element with the meaning "coal" in Latin. It is nonmetallic and tetravalent, meaning that four of its atom's electron molecules can be used to create covalent chemical connections. The periodic table's group 14 is where it belongs. Only 0.025 percent of the crust of the Earth is made up of carbon. The tendency of an atom of a certain chemical element to draw shared electrons (or electron density) when forming a chemical connection is known as electronegativity and is represented by the symbol.
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The half-life of iodine-123 is 13.3 hours. How much of a 25.0 mg sample will remain after 39.9 hours?
A. 3.12 mg
B. 6.25 mg
C. 1.56 mg
D. 25.0 mg
E. 12.5 mg
3.12 mg of sample will remain after 39.9 hours if the half life of iodine is 13.3 hours.
Half life of the reaction is the time required for the reactant concentration to decrease to one-half its initial value. The half-life of a first order reaction is a constant that is related to the rate constant for the reaction.
here, Half life of iodine is 13.3 hours. so,
Half life t1/2 = ln 2/ K
k = 0.693 / t1/2
= 0.693 /13.3 hours
= 5.21 *10-2
The rate of a reaction is dependent on rate constant which is different for each reaction type. A first-order reaction is a reaction where the rate is dependent on the concentration of only one reactant. Because of this, it is also called a unimolecular reaction. The rate equation for this type of reaction is: Rate constant for first order reaction is,
k= 1/t ln [A]0 / [A]t
t = 39.9 hours
k = 5.21 * 10-2 / hour
putting all the values in the expression of rate constant for first order reaction we get,
[A]t = 3.12mg
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determine the longest wavelength of light that can remove an electron from a sample of potassium metal if the binding metal
If the electron's binding energy is low enough, light with a wavelength of 68 nm can remove one electron from the a specimen of potassium metal.
Who or what is an electron?A negative charge subatomic particle known as an electron can either be free or attached to an atom (not bound). One of the three main types atomic particles within an atom is an e that is bonded to it; an other two include proton and neutrons.
Can electrons halt their motion?An electron must always be oscillating at some frequency because it is a classical object with wave-like characteristics. An electron must be annihilated in order for its vibrational frequency to drop to zero.
Briefing:Binding energy of electron = 176 × 10³ Kj/ mol or (1.76× 10⁶ j/mol)
h = (6.63×10⁻³⁴ J/s)
c = (3×10⁸ m/s)
The energy require per electron is
1.76 × 10⁶ j / 6.02× 10²³ = 2.92 × 10⁻¹⁸ J
E = hc / λ
λ = hc / E
λ = 6.63×10⁻³⁴ m².kg.s⁻¹ * 3×10⁸ m/s / 2.92 × 10⁻¹⁸ J
λ = 6.8 ×10⁻⁸ m
λ = 6.8 ×10⁻⁸ × 10⁹
λ = 68 nm
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g which products are formed during the electrolysis of a concentrated aqueous solution of sodium chloride?
The products of electrolysis of concentrated aqueous solution of sodium chloride are sodium hydroxide, hydrogen gas and chlorine gas.
What is electrolysis?
By passing a direct electric current through an ionic compound in fluid form, electrolysis is the process of breaking down the substance into its constituent elements. Anions are oxidized at the anode while cations are reduced at the cathode. An electrolyte, electrodes, and some sort of external power source are the essential components needed to perform electrolysis.
Several large compounds with industrial use, such as sodium hydroxide and chlorine, are produced by an important process called sodium chloride electrolysis. It is possible to electrolyze sodium chloride in aqueous solutions or in a molten state. In order to speed up the redox processes, extra salts are also present when electrolysis is performed.
The electrolysis of a concentrated solution of NaCl gives (I) Cl2, (II) NaOH (aq) and (III)H 2 (g).
[tex]2NaCl (aq) + 2H2O[/tex] → [tex]2NaOH (aq) + H2(g) + Cl2 (g)[/tex]
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what is the correct form of the conversion factor needed to convert the number of moles of o to the number of moles of produced?
When converting from the known number of moles of one material to the unknown number of moles of another, a mole ratio is utilized. Using molar mass, which is the sum of the atomic masses of the constituent atoms of a molecule, one can convert between moles and grams of a chemical.
The mass of one mole, or 6.022 x 1023 atoms, of an element is its atomic mass, measured in grams. The number of moles of the chemical must then be divided into atoms. Avogadro's constant (6.022141791023) / one moles of a substance is needed to convert a substance's moles to atoms.
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When viewed from Oswego, how high will Polaris appear in the sky?
The North Star, or Polaris, can be found above the North Pole on the north celestial pole. It is directly overhead when viewed from the North Pole and lies on the northern horizon when viewed from the equator (at an altitude of 0 degrees) (at an altitude of 90 degrees).
Polaris' altitude in the sky is what?The northern horizon is 30 degrees above the location of Polaris. Until the traveler reaches the geographic (as opposed to magnetic) North Pole, this pattern will continue. Polaris is straight overhead at this latitude (90 degrees), 90 degrees above the northern horizon.
Is Polaris' altitude always 90 degrees?Polaris is always 90 degrees above the horizon if you are looking at it from the north pole (latitude 90 degrees), and it is also true at intermediate latitudes.
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Which of the following is a covalent compound?
a
CaO
b
CO
c
K2O
d
BaO
Answer:
b. CO
Explanation:
Covalent bonding involves the sharing of electrons between two or more atoms (mostly non-metals)
The other 3 are ionic bonds (metal and non-metal)
n this experiment, two equivalents of benzaldehyde were used, and the desired product was dibenzylideneacetone. how can you use the attached proton nmr of the product to show that you did not isolate the product of a single aldol condensation (that is, benzylideneacetone).
The two equivalents of benzaldehyde were used, and the desired product was dibenzalacetone has the proton NMR signal is 5 signals.
The reaction of the two equivalents of benzaldehyde with the acetone show the aldol condensation and form the product is dibenzalacetone.
the dibenzalacetone shows the following proton NMR signals:
proton a : 7.1 ppm , doublet = 1 proton
proton b : 7.8 ppm doublet = 1 proton
proton c : 7.5 ppm doublet = 2 protons
proton d : 7.4 ppm is the multiplet = 2 protons
proton e : 7.3 ppm multiplet
The chemical shifts are based on the protons chemical environment. the coupling constant is 12 Hz for the olefinic hydrogens.
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