The chemical shift of a given proton is decided specifically with the aid of interactions with the nearby electrons. The most necessary thing to recognize is that when electrons are subjected to an external magnetic field, they structure their own small prompted magnetic fields in opposition to the exterior field.
Consider the methane molecule ( CH4 ) in which the four equal protons have a chemical shift of 0.23 ppm (this is a price we can look up in any chemistry reference source). The valence electrons around the methyl carbon, when subjected to B0, generate their own very small triggered magnetic area that opposes B0 . This induced field, to a small however full-size degree, shields the close by protons from experiencing the full force of B0 , an impact regarded as local diamagnetic shielding. In different words, the methane protons do now not quite journey the full force of B0 - what they journey is known as Beff , or the high-quality field, which is slightly weaker than B0 due to the have an effect on of the close by electrons.
In nuclear magnetic resonance (NMR) spectroscopy, the chemical shift is the resonant frequency of an atomic nucleus relative to a preferred in a magnetic field. Often the position and range of chemical shifts are diagnostic of the shape of a molecule.
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sulfide is formed when copper and sulfur are heated together. In this reaction, 130 g of copper reacts with 45 g of sulfur. After the reaction is complete, 8.0 g of unreacted sulfur remain. What is the mass of copper(II) sulfide formed?
The mass of copper(II) sulfide formed when copper and sulfur are heated together is 167g.
How to calculate mass of products and reactants?The law of conservation of mass states that the mass of a substance can neither be created nor destroyed.
This law further explains that in a chemical reaction, the mass of the reactants must equal the mass of the products.
According to this question, sulfide is formed when copper and sulfur are heated together. In a reaction, 130 g of copper reacts with 45 g of sulfur.
However, after the reaction is complete, 8.0 g of unreacted sulfur remain. This suggests that the mass of sulfide produced is as follows:
(130g + 45g) - 8g = 167g
Therefore, the mass of copper(II) sulfide formed when copper and sulfur are heated together is 167g.
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What is the limiting reactant for the following reaction given we have 3.4 moles of ca(no3)2 and 2.4 moles of li3po4?
Calcium nitrate [tex]Ca(NO_{3})_{2}[/tex] )is the limiting reactant for the reaction.
This is fewer than the 2.4 moles of lithium phosphate [tex]Li_{3} PO_{4}[/tex] that are readily available. This indicates a deficiency in calcium nitrate[tex]Ca(NO_{3})_{2}[/tex]. 2.4 moles of lithium phosphate must be added in order to complete the reaction.
As a result, calcium nitrate [tex]Ca(NO_{3})_{2}[/tex] is the limiting reagent and lithium phosphate[tex]Li_{3} PO_{4}[/tex] is in excess. The availability of Calcium Nitrate [tex]Ca(NO_{3})_{2}[/tex] is lesser than the 2.4 moles of lithium phosphate [tex]Li_{3} PO_{4}[/tex] that are accessible. This indicates that present amount of calcium nitrate [tex]Ca(NO_{3})_{2}[/tex] is inadequate to completely react with 2.4 moles of lithium phosphate[tex]Li_{3} PO_{4}[/tex]. Thus, calcium nitrate [tex]Ca(NO_{3})_{2}[/tex] is the limiting reagent and lithium phosphate [tex]Li_{3} PO_{4}[/tex] is in excess.
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Linking amino acid monomers together to form a polymer requires the formation of which type of bond?.
Polypeptides : Peptides are tiny chains of amino acids connected by the peptide bonds.
Function of polypeptides : Polypeptides aid make up proteins by bonding many amino acids conjointly.
Amino acids are organic components that comprises both amino and carboxylic acid functional groups.
Sequence of amino acids are known as polypeptides. The covalent bonds that hold on to amino acids conjointly are known as peptide bonds.
Types of amino acids : nonpolar, polar, negatively charged, and positively charged.
According to question
Linking amino acid monomers together to form a polymer requires the formation of peptide bonds.
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Convert 3.6 g/cm³ to lb/in³.
Answer:
0.130058
Explanation:
divide the mass / volume by 27.68
Which food contains at least 100 mcg of folate per serving? one, some, or all responses may be correct.
One-half cup of black-eyed peas contains at least 100 mcg of folate per serving.
In infants and the women with poor folic acid intakes, the neural tube defects (NTDs), or failures in the closure of the neural tube are more common. For the normal formation of the spinal cord, proper closure of the neural tube is required.
Within the first month of gestation, the neural tube begins to close, often before a person realizes that she is pregnant.
Therefore, 0.4 mg of folic acid should be taken every day, while consuming dietary sources of folate, i.e. intake of folate rich diet/meal by all people who are capable of becoming pregnant.
One-half cup of black-eyed peas contains at least 100 mcg of folate. Ready-to-eat breakfast cereal contains 200 mcg of folate and a slice of bread contains 20 mcg, and not 100 mcg of folate. One-half cup of broccoli and a cup of pasta contain 50 mcg, not 100 mcg of folate.
Complete question is-
Which food contains at least 100 mcg of folate per serving? one, some, or all responses may be correct.
1. Bread
2. Broccoli
3. Cooked pasta
4. Black-eyed pasta
5. Ready-to-eat breakfast cereal
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please help
The amount of matter in an object is known as ____ and it is measured using an electronic balance. The SI unit used with this measurement is ___. The amount of space something takes up is ___ and a graduated cylinder is most commonly used for liquids. The basic SI unit used for graduated cylinders in the ___.
please put answers in order
Answer:
Mass.
Si Unit Measurement.
volume.
milliliters.
Landfills produce methane, which is a greenhouse gas and contributes to global warming. please select the best answer from the choices provided t f
It is true that methane, which is a greenhouse gas and contributes to global warming.
A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range.
Global warming is rise in the average temperature of the Earth's climate system.
Most often greenhouse gases are carbon dioxide (CO₂) and methane (molecular formula CH₄). These gases come from burning multiple substances: coal, petroleum, plastic and natural gas.
Balanced chemical reaction of combustion of methane:
CH₄ + 2O₂ → CO₂ + 2H₂O
Greenhouse gases are so difficult to measure, because carbone dioxide, methane, chlorofluorocarbons comes from multiple sources, some of which are relatively hard to measure.
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Answer:
It's true
Explanation:
Took the test
Wherever it is found, water always contains oxygen and hydrogen in the mass ratio of 8 to 1. Taken by itself, this fact demonstrates what natural law?.
Natural law demonstrates constant composition wherever it is found, water always contains oxygen and hydrogen in the mass ratio of 8 to 1.
The above statement agreed by Law of constant proportions according to this law, a chemical compound always contains the same proportion of elements by mass. thus, irrespective of the source, or chemical compound always contains the element in a fixed ratio by mass for example, pure water obtained from river, sea, well always contains hydrogen and oxygen combined together in the ratio of 1:8 by mass that's why wherever it is found, water always contains oxygen and hydrogen in the mass ratio of 8 to 1. Taken by itself, this fact demonstrates constant proportions law demonstrates as natural law
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The first deaf african american alumnus of gallaudet to earn a doctorate was _______________ in 1982. shs 222
The first deaf Africans American alumnus of Gallaudet to earn a doctorate was Dr. Glenn B. Anderson in 1982.
Who is Dr. Glenn B. Anderson?As the first Deaf African-American doctor in the United States, Dr. Glenn B. Anderson is well-known in his field.
He was born and reared on Chicago's South Side, and at the age of seven, he lost his hearing. His parents advised him "you have to be twice as excellent as everyone else to succeed" when they encountered difficulties and challenges in his early life.
Dr. Anderson graduated with a bachelor's degree in psychology from what was then the Gallaudet College in 1968, and he then went on to the University of Arizona to get a master's degree in rehabilitation counseling.
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As the wavelength of an electromagnetic wave gets longer, the frequency ____________________.
Which electron configuration is correct for a ca 2 ion?
a. 1s22s22p63s23p1
b. 1s22s22p63s23p64s24p6
c. 1s22s22p63s23p64s2
d. 1s22s22p63s2
e. 1s22s22p63s23p6
The correct answer for electron configuration of a Ca2+ ion is e. 1s22s22p63s23p6 which is isoelectronic with the noble gas argon.
Isoelectronicity is a phenomenon determined whilst or greater molecules have equal structure (positions and connectivities amongst atoms) and equal digital configurations, however, range through what particular factors are at positive places withinside the structure.
This definition is on occasion termed valence isoelectronic. Definitions can on occasion be now no longer as strict, on occasion requiring identification of the full electron matter and with it the whole digital configuration.[2] More usually, definitions are broader and can enlarge to permit one-of-a-kind numbers of atoms withinside the species being compared.[3]
The significance of the idea lies in figuring out considerably associated species, as pairs or series. Isoelectronic species may be anticipated to reveal beneficial consistency and predictability of their houses, so figuring out a compound as isoelectronic with one already characterized gives clues to feasible houses and reactions (Differences in houses which includes electronegativity of the atoms in isoelectronic species can have an effect on reactivity.)
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In atom has 11 protons, 12 neutrons, and 10 electrons. this atom has an atomic number of ______, an atomic mass of ________, and an overall charge of ______.
In atom has 11 protons, 12 neutrons, and 10 electrons. this atom has an atomic number of 11 , an atomic mass of 23 , and an overall charge of +1 .
What is electron?
Unattached or attached to an atom, an electron is a negatively charged subatomic particle (not bound). One of the three main types of particles inside an atom, along with protons and neutrons, is an electron that is linked to the atom.
An atom's nucleus is made up of electrons, protons, and neutrons. The positive charge of a proton balances out the negative charge of an electron. An atom is in a neutral state if its protons and electrons are equal in number.
They have a mass that is considerably lower, exist outside of the nucleus, and display both wave- and particle-like properties. Since an electron is also a fundamental particle, it is unreinforced and unbroken.
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Name the spectral line in the spectrum of h-atom obtained when an electron jumps from n = 4 to n = 3.
The spectral line has been defined as the more or less number of photons in the spectrum that appears bright or dark. The electron jumping from n = 4 to 3 belongs to the Paschen series.
What is the Paschen series?The Paschen series is the Infrared (I.R) region that has a number of lines estimating from higher energy levels to n = 3 energy levels. If the electron jumps from n = 4 to n = 3 then they have wavelengths of 1875 nm.
This wavelength has been found to lie in the IR region that emits electrons from the atom of hydrogen. The electron tends to move from higher energy states to lower energy states.
Therefore, the electron transition belongs to the Paschen series.
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The density of a 167.4 g sample of magnesium having a volume of 96.32 ml is ________ g/cm3.
The density of a 167.4 g sample of magnesium having a volume of 96.32 ml is 1.737 g/cm3.
What is density?The mass per unit volume is known as density. A scalar quantity, density. It is represented by the letter D, and the Greek letter rho is used as the sign for density. Mass divided by volume is how density is computed.
Mass is a physical body's total amount of matter. Mass is defined as the sum of the moles of the material and the compound's molar mass.
Given the mass is 167.4 g
The volume is 96.32 ml
mass / volume
167.4 / 96.32 = 1.737
Thus, the density of a 167.4 g sample of magnesium is 1.737 g/cm3.
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Suppose you stir a little baking soda into water until the water looks clear again. how could you prove to someone that the clear material is a mixture and not a compound?
To prove to someone that the clear material is a mixture and not a compound, you could put the solution in a cup and then let the water evaporate. The baking soda will stay in the cup.
What is baking soda?Baking soda is a NaHCO₃. Its chemical name of sodium bicarbonate. It is a salt of carbonates. It is used in making dishes. This is used to make cakes or other fermented foods.
Thus, you may put the solution in a cup and then let the water evaporate to demonstrate to someone that the clear substance is a mixture rather than a compound. The cup will hold the baking soda.
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Culinary arts is about understanding how flavors and ingredients blend together to
create edible masterpieces, which makes it a study of
(1 point)
O chemistry and algebra.
O art and science.
O psychology and history.
O biology and literature.
What is the name for a material with a free electron in its valence ring that allows electricity to flow freely?
Answer:
conductor
Explanation:
If the density of a metal sample is 1.56 g/l and the volume of the sample is 250ml, calculate the mass of the metal sample.
The metal sample with a density of 1.56 g/l and a volume of 250ml, has a mass of: 0.39 g
The density formula and the procedure we will use is:
ρ = m/v
Where:
v= volumeρ= densitym= massInformation about the problem:
ρ= 1.56 g/lv= 250mlm= ?By converting the volume units from (ml) to (l) we have:
v= 250ml * 1 l /1000 ml
v = 0.25 l
Applying the density formula and clearing the mass (m), we get:
m = ρ * v
m = 1.56 g/l * 0.25 l
m = 0.39 g
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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Considere the rate law rate = k[co2][n2]^n what is the order with respect to co2?
The order with respect to CO2 is 1 i.e it is first order with respect to CO2.
The rate of any chemical reaction can be determined by chemical kinetics, which is a branch of chemistry dealing with the study of reaction rates and their mechanisms.
According to chemical kinetics, the rate of a reaction depends upon its reactants which is given by the rate law expression,
Let us take a hypothetical example to understand the rate law expression
aA+ bB ⇒ cC
In the above reaction, we can write the rate law expression as,
Rate =k [A]^x[B]^y, where x and y are the orders of the reactants, a and b respectively and k is a constant.
Similarly, in the expression Rate = k [co2][n2]^n, the order of CO2 is 1 and the order of N2 is n.
Hence, the order with respect to CO2 is 1 i.e it is the first order with respect to CO2.
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In a combination circuit, to identify series and parallel elements, you should _____.
How many moles of acetic acid are in 1.52 ml if the concentration of the solution is 1.23 m.?
Acetic acid are in 1.52 ml if the concentration of the solution is 1.23 m 0.031 mole are present.
Here mass of acetic acid is 60g/mol and here given mole is 1.52 ml then
1.52/60= 0.025 and also here concentration are given then concentration=n/V so, n=C×V= 1.23 × 0.025=0.03mole
So in 1.52 ml 0.03mole are seen
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Gold has a density of 0.01932 kg/cm3. what volume (in cm3) would be occupied by a 22.2 g sample of gold?
The volume occupied by a 22.2 g sample of gold having a density of 0.01932 kg/cm3.
As we know that the density of a given substance is :
Density = mass/volume
Now to find the volume, reshuffle the formula:
volume = mass/ density
Now,
density = 0.01932 kg/cm3
mass = 22.2g = 0.0222 kg
Putting the values,
volume = 0.01932/0.0222
volume = 1.49 cm3
The volume is 1.49 cm3.
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Substance P is soluble in water but insoluble in propanone.
Substance Q is insoluble in water but soluble in propanone.
Substance R is insoluble in both water and propanone.
Describe how to obtain a pure dry sample of each of P, Q, and R from a mixture of P+Q+R.
When 10.286 g of a compound containing only carbon and hydrogen was burned completely in 38.265 g of oxygen, 33.264 g of carbon dioxide and some water were formed. calculate the mass of water.
Mass of water = 15.287 grams.
The equation here will look like this:
CxHy + O2 ------->CO2 + H2O
Hydrocarbon (contains c' and 'H' alone) and O2 are the reactants in this reaction.
Water and carbon dioxide are products.
Since mass cannot be created or destroyed in an isolated system, we now know this to be true. Although it is conserved, it can change forms.
Therefore, for chemical reaction
The mass of the reactants and the mass of the products must match. Here, just forms are altered to create the product.
Consequently, according to the Mass Law of Conversion:
Mass of Reactants = Mass of Products, we might say.
[(Mass of CO2) + (Mass H2O ] = [(Mass of Hydrocarbon) + (Mass of 02)]
[10.286 + 38.265] = [33.264 g + Mass of H20]
48.551 = 33.264 + Mass of H2O.
Mass of water equals 48.5519-33.261
The Mass of water will therefore be 15.287 grams.
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The distance between the two hydrogen atoms in a molecule of water is 0.000000000172 m. express this distance in scientific notation.
The distance between the two hydrogen atoms in a molecule of water is 0.000000000172 m,1.72x10 ^-10m is the distance in scientific notation.
Distance is the overall movement of an object, regardless of direction. The distance can be defined as the amount of ground an object has moved, regardless of its start or end point. An object's distance can be defined as the complete distance an object travels. for example. If the car drives 5 km east and then turns 8 km north, the total distance traveled by car is 13 km.
Distance is defined as the distance, or separation, between two objects. An example distance is 5 feet between two tables. An example of distance is the difference between both sides of the problem. noun.
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According to mo theory, when two atomic orbitals overlap, they combine to form an antibonding mo that is ____ energy and a bonding orbital that is _____ energy.
According to MO theory, when two atomic orbitals overlap, they combine to form an antibonding molecular orbitals that is lower energy and a bonding orbital that is higher energy. The electrons in a molecule are viewed as moving under the influence of the atomic nuclei throughout the entire molecule in molecular orbital theory rather than being allocated to specific chemical bonds between atoms.
The molecular orbitals that encircle and contain valence electrons between atoms in molecules are how quantum mechanics characterizes the spatial and energetic characteristics of electrons. By roughly representing the states of bound electrons—the molecular orbitals—as linear combinations of atomic orbitals, the molecular orbital theory revolutionized the study of chemical bonding (LCAO).
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What would happen to the ph of the cells of a group of people having a contest as to which one can stop breathing for the longest time?
If one can stop breathing for the longest time builds up in their systems pH of the cells causing the pH of their own blood to drop slightly 'pH level increases'
pH means quantitative measure of the acidity or basicity of aqueous or other liquid solutions
For most people its safe to hold your breath for a minute or two but so much longer can decreases oxygen flow to the brain can causing damage your brain as well as in heart a lack of oxygen can cause abnormalities or rhythm and can affect the pumping action of heart and when the brain senses the change in pH due to increased carbon dioxide it increases our respiratory system to get more oxygen and blow out more carbon dioxide in an taking the normal balance between oxygen and carbon dioxide that's why pH level increases
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Ionic bonds are ___________ than covalent bonds and are ___________ common in cells.
Answer:
Ionic bonds are stronger than covalent bonds
1. Eight atoms of carbon react with 18 atoms of hydrogen, forming only one molecule of CsHis. Is the
forming of only one molecule considered a violation of the law of conservation of mass? Explain.
Eight atoms of carbon react with 18 atoms of hydrogen , forming only one molecule of [tex]C_{8} H_{18[/tex] is considered as violation of the law of conservation of mass .
According to the law of mass conservation , neither chemical processes nor physical changes can create or destroy mass in an isolated system . The mass of the products and reactants of a chemical reaction must be equal, in accordance with the law of conservation of mass .
The reaction occur when eight atoms of carbon react with 18 atoms of hydrogen , forming only one molecule of [tex]C_{8} H_{18[/tex] is given as .
8C +18[tex]H_{2}[/tex] → [tex]C_{8} H_{18[/tex]
Mass of reactants = 8 × 12 + 18 × 2 = 132 g
Mass of reactants = 8 × 12 + 18 = 114 g
So , mass of reactant is not equal to the mass of product .
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The type of synapse that occurs between the terminal end of the presynaptic cell and the dendrites of the postsynaptic cell is referred to as which kind of synapse?
Axodendritic type of synapse that occurs between the terminal end of the presynaptic cell and the dendrites of the postsynaptic cell is referred to as which kind of synapse
Synapses are part of the circuits that connect the sensory organs of the peripheral nervous system to the brain. B. People who perceive pain and touch. Synapses connect neurons in the brain to neurons in the rest of the body, and from those neurons to muscles.
A synapse is a small gap between two neurons where nerve impulses are carried by neurotransmitters from the axon of a presynaptic (transmitting) neuron to the dendrites of a postsynaptic (receiving) neuron. It is called the synaptic cleft or synaptic cleft.
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