{{c1::Anomers}} are epimers that are formed when ring closure happens at an epimeric carbon
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Anomers are a type of epimer that are formed when a cyclic sugar molecule is created at an epimeric carbon.
Epimeric carbons are carbon atoms in sugar molecules that have different stereochemistry than their corresponding carbon in another sugar molecule. When a sugar molecule undergoes ring closure, the carbon atom that forms the new ring may have a different configuration than the carbon in the open-chain form. This leads to the formation of two anomers - α-anomer and β-anomer.
The difference between these two anomers is the orientation of the hydroxyl group at the anomeric carbon. The α-anomer has the hydroxyl group pointing down, while the β-anomer has the hydroxyl group pointing up. The formation of these anomers has significant implications in biochemistry and food chemistry.
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Related Questions
A radioactive substance has a decay rate of 0.064 per minute. How many grams of a 150 gram sample will remain radioactive after 45 minutes
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To determine how many grams of a 150-gram sample will remain radioactive after 45 minutes, we need to consider the decay rate and the decay constant of the substance. The decay rate is given as 0.064 per minute, which means that 0.064 units of the substance decay per minute. After calculations, it is found that approximately 132.07 grams of the original 150-gram sample will still be radioactive after 45 minutes.
The decay constant (λ) is related to the decay rate by the equation: decay rate = λ * initial amount.
In this case, the initial amount is 150 grams. So we can rearrange the equation to solve for λ: λ = decay rate / initial amount.
λ = 0.064 / 150 = 0.0004267 per gram.
Now, we can use the decay constant to calculate the remaining amount of the substance after 45 minutes using the equation: remaining amount = initial amount * exp(-λ * time).
Remaining amount = 150 * exp(-0.0004267 * 45).
Calculating this expression, we find that approximately 132.07 grams of the 150-gram sample will remain radioactive after 45 minutes.
Therefore, approximately 132.07 grams of the original 150-gram sample will still be radioactive after 45 minutes.
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Which of the following should be done when designing an experiment for a controlled scientific investigation?
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A usual type of controlled experiment balance a control group against an experimental group.
Which of the following should be done when designing an experiment for a controlled scientific investigation?The parts of the experimental design are control, free variable, dependent variable, constant variable, randomly assignment, and manipulation. These are the components is also help you explain if the experiment is valid. A controlled experiment is an experiment that set side by side the effect of one manipulated variable on a group that collects no treatment. controlled variables. the element that should be kept matching in both the nursing group and the non-treated group. True experiments have four elements: artifices, control, random or assignment, and random selection. The main of these elements is manipulation and control. Manipulation means that something is purposefully changed by scientists and the environment.
so we can conclude A common type of controlled experiment compares a control group against an experimental group.
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help!!! ASAP!!!
balace the equations
Answers
ABX
Explanation:
But upload an image straight next time
i need help please it's so hard help0123456789abcdefghij edited question
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This is a perfect answer
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\(\text{y = ax + b}\)
help meeeeeeeee pleaseeeeeeeeeee
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Plant cells and animal cells were observed under a microscope. The characteristics of two cells are listed below.
Cell X: Has chloroplast
Cell Y: Does not have a cell wall
Which statement about the two cells is correct? (5 points)
a
Cell X has a cell membrane.
b
Cell X has a small vacuole.
c
Cell Y has a large vacuole.
d
Cell Y has chloroplast.
Answers
Answer:
The answer is B
Explanation:
ITs B
Answer:
Cell X has a cell membrane
Explanation:
I took the test and got it right.
Direct electron transfer from a singlet reduced species to a triplet oxidizing species is quantum-mechanically forbidden
Answers
Direct electron transfer from a a singlet reduced species to a triplet oxidizing species is quantum-mechanically forbidden.
Transfer from singlet to triplet:Either an excited singlet state or an excited triplet state will occur when an electron in a molecule with a singlet ground state is stimulated (through radiation absorption) to a higher energy level. All electron spins in a molecule electronic state known as a singlet are coupled.In other words, the ground state electron and the stimulated electron's spin are still coupled (a pair of electrons in the same energy level must have opposite spins, per the Pauli exclusion principle). The excited electron and ground state electron are parallel in a triplet state because they are no longer coupled (same spin). It is less likely that a triplet state would arise when the molecule absorbs radiation since excitation to a triplet state necessitates an additional "forbidden" spin transfer.To view more questions on quantum mechanism, refer to:
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Kw=[H3O+][OH-]=1.0x10^-14 At 25*c
Based on the information above, which of the following is true for a sample of pure water at 25°C?
A: [H₂0+] = 7.0 M
B: [OH-] = 1.0 x 10-¹4 M
C:pH = 10-7
D: POH = 7.00
Answers
A sample of pure water at 25°C has a pH of 7.00.
we can use the Kw expression to calculate the concentration of either ion:
Kw = [H3O+][OH-]
Since pure water is neutral, [H3O+] = [OH-]. Therefore:
[H3O+] = [OH-] = sqrt(Kw) = sqrt(1.0 x 10^-14) = 1.0 x 10^-7 M
So, the correct answer is C: pH = 7.00.
The pH of a solution is defined as the negative logarithm of the H3O+ concentration:
pH = -log[H3O+]
Substituting the value we found for [H3O+], we get:
pH = -log(1.0 x 10^-7) = 7.00
Therefore, a sample of pure water at 25°C has a pH of 7.00.
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Consider the insoluble compound nickel(II) hydroxide, Ni(OH)_2. The nickel ion also forms a complex with cyanide ions. Write a balanced net ionic equation to show why the solubility of Ni(OH)_2 (s) increases in the presence of cyanide ions and calculate the equilibrium constant for this reaction. For Ni(CN)_4^2-, K_f = 1.0 Times 10^31. Use the pull-down boxes to specify states such as (aq) or (s).
Answers
The pull-down boxes to specify states such as (aq) or (s) conclude that equilibrium constant for this reaction is 2.8*10¹⁵.
The following chemical reaction equation results in the formation of the nickel cyanide complex.
Ni(OH)(s)+4CN=={Ni(CN)²₄]+2OH
We know that,
K = Kf.Ksp
We are given that, Kf=1*10³¹
and, Ksp=2.8*10⁻¹⁶
K = Kf.Ksp
K = (1*10³¹)*(2.8*10⁻¹⁶)
= 2.8*10¹⁵
Thus, we can conclude that equilibrium constant for this reaction is 2.8*10¹⁵.
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asymmetries in the distribution of h2o and co2 in the inner coma of comet 9p/tempel 1 as observed by deep impact
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The inner coma of Comet 9P/Tempel 1 exhibits asymmetries in the distribution of H2O and CO2, as observed by the Deep Impact mission. The Deep Impact spacecraft was designed to study the composition and structure of comets.
The asymmetries in the distribution of H2O and CO2 refer to the unevenness in the concentration and spatial arrangement of these molecules within the inner coma of the comet. The inner coma is the cloud of gas and dust surrounding the nucleus of the comet.
Deep Impact's observations revealed that the distribution of H2O and CO2 within the inner coma of Comet 9P/Tempel 1 was not uniform. There were areas of higher and lower concentrations of these molecules, creating asymmetries in their distribution.
These asymmetries could be due to various factors, such as uneven outgassing from the comet's nucleus, variations in the temperature and composition of the coma, or interactions with the solar wind and magnetic fields.
Studying these asymmetries provides valuable insights into the processes and dynamics occurring within comets, as well as their evolution over time. The data obtained by Deep Impact contributes to our understanding of cometary compositions and the factors that shape their inner comas.
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Atoms with the same number of protons but different masses (from different numbers of neutrons) are called:
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Atoms with the same number of protons but different masses (from different numbers of neutrons) are called: Isotopes
Isotopes:
An isotope is one of two or more forms of the same chemical element. Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.
Elements with Different Atomic Masses:
Primarily there exists a total of three subatomic particles. Protons, neutrons and electrons. Protons and neutrons are inside the nucleus and much heavier than electrons. The atomic number of each element represents the number of protons of an atom of that element.
Reason :
Atoms that have the same number of protons but different numbers of neutrons are called isotopes.
The number of existing protons and electrons in a neutral atom of an element is equal. But, the atoms of an element may have a different number of neutrons. Since neutrons do not participate in an atom's chemical reactions, the chemical properties of all these different atoms of an element are the same.
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How many atoms are in 0.500 moles of Nitrogen?
Answers
Answer:7.00335
Explanation:
What type of heat transfer causes the water in the bottom of the pool to be cooler and the water at the top to be warm?
Answers
Answer:
i think its convection
Explanation:
1. Electronegativities of the elements Be, Mg, Ca, and Sr follow a specific trend within their group. Based on this trend, the atoms of which element will have the least attraction for an electron?
A) Be.
B) Mg.
C) Ca.
D) Sr.
2. Which element has a larger atomic radius than sulfur?
A) Chlorine.
B) Cadmium.
C) Fluorine.
D) Oxygen.
3. Which ion was formed by providing the second ionization energy to remove an electron?
A) Ca2+.
B) N3–.
C) Fe3+.
D) S2–.
4. The most negative electron affinity is most likely associated with which type of atoms?
A) Large nonmetal atoms.
B) Small nonmetal atoms.
C) Large metal atoms.
D) Small metal atoms.
5. Selected properties of antimony (Sb) and iodine (I) are listed in the table below.
Element AtomRadius(pm) 1st IonEnergy(kJ/mol) ElectroAffinity(kJ/mol) Electronegative
Sb 145 ? –103 2.05
I 140 1008 –295 ?
Which predictions can most likely be made?
Sb has a lower ionization energy but a higher electronegativity than I.
Sb has a higher ionization energy but a lower electronegativity than I.
Sb has a lower ionization energy and a lower electronegativity than I.
Sb has a higher ionization energy and a higher electronegativity than I.
6. Which correctly summarizes the trend in electron affinity?
A) It tends to be very high for group 2.
B) It tends to be more negative across a period.
C) It tends to remain the same across periods.
D) It tends to be more negative down a group.
7. Which explains the change in ionization energy that occurs between removing the first and second electrons from an atom?
A) The ionization energy decreases because the ratio of the protons to electrons increases.
B) The ionization energy increases because the ratio of the protons to electrons increases.
C) The ionization energy decreases because the ratio of the protons to electrons decreases.
D) The ionization energy increases because the ratio of the protons to electrons decreases.
8. Which element would most likely have an electron affinity measuring closest to zero?
A) Na.
B) Al.
C) Rb.
D) Ar.
9. Electronegativities of the elements Na, Al, P, and Cl follow a specific trend across the period. Based on this trend, an electron will be most strongly attracted to
A) Na.
B) Al.
C) P.
D) Cl.
10. Which best describes ionization energy?
A) Energy needed to add an electron to a neutral atom in the gas phase.
B) Energy needed to add an electron to a neutral atom in the liquid phase.
C) Energy needed to remove an electron from an atom or ion in the gas phase.
D) Energy needed to remove an electron from an atom or ion in the liquid phase.
Answers
Answer: B D B A C B E D A B
Explanation:
When the dry ingredients of a cake are combined, what is the result?
atom
compound
mixture
element
Answers
When the dry ingredients of a cake are combined, the result is a mixture. Option 3.
What are mixtures?In chemistry, mixtures are substances that are obtained by mixing two or more chemically different substances together with each substance maintaining its chemical identity. In other words, the components of a mixture are still chemically unique and can be separated by physical means.
Mixtures can be homogeneous or heterogeneous. Homogenous mixtures are mixtures in which the components are uniformly dispersed throughout the entire mixture. For heterogeneous mixtures, the components are not uniform throughout the mixture.
Thus, when the dry ingredients of a cake, such as flour, sugar, etc., are combined, what we are going to have is a mixture. Whether this mixture would be homogenous or heterogeneous will depend on the level of mixing. Whatever the case may be, the components can still be separated by physical means.
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need help with 11 and 12 please and thank you!!!
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Holding a toast will not help in preventing Johny from dying of hypothermia as the thermal energy produced by holding a hot toast is not sufficient to maintain the thermal energy of the body.
What is thermal energy?Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.
Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.
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I NEED HELP
Can an element be a molecule?
Answers
Answer:
Not quite, they are different catagories.
Explanation:
A molecule is two or more atoms connected to each other. An element is an atom with a name. Think of water, a single water molecule is called H2O because it has two hydrogen atoms and one oxygen atom. Hydrogen and oxygen are both elements. Another way to see it is like, there are many kinds of animals(atoms). A specific animal would be a cat or a bird or something(the elements).
TLDR: An element can be part of a molecule, but is not one on its own.
A student models the relationship between the Earth and the Sun using string and a ball. Which of the following explains the relationship demonstrated?
The magnetic attraction between Earth and the Sun.
The kinetic energy stored in Earth that originated in the Sun.
The gravitational attraction between the Earth and Sun.
The electromagnetic energy between the Earth and Sun.
Answers
Answer:
C
Explanation:
The relationship demonstrated by the student using a string and a ball to model the Earth and Sun is the gravitational attraction between the two celestial bodies. Gravity is the force that keeps the Earth in orbit around the Sun, and the strength of this force is proportional to the masses of the two objects and the distance between them. The string represents the gravitational pull between the two objects, which keeps the ball (representing the Earth) in a circular orbit around the larger ball (representing the Sun). Therefore, the correct answer is:
The gravitational attraction between the Earth and Sun.
If a certain species is found to have DNA composed of 17% cytosine, what would be the percentages of the other three bases?
Adenine = %
Thymine = %
Guanine = %
Enter only a number/numeral in each provided box.
Answers
Answer:
Adenine=33%
Thymine=33%
Guanine=17%
Explanation:
the base pairs percentages must be the same
Between reaction of magnesium powder and lead oxide which is oxidized in the reaction and which is oxidizing agent
Answers
Answer:
Mg is oxidized and Pb is the oxidizing agent
Explanation:
What is the pOH of a solution with a hydroxide ion, [OH-], of 7.34 X 10-³ M?
Answers
The pOH of a solution with a hydroxide ion, [OH-], of 7.34 X 10-³ M is 11.87.
How to calculate pOH?pH and pOH are measures of the acidity or alkalinity of a solution. The pOH can be calculated from the pH using the following expression;
pOH + pH = 14
According to this question, a solution has a hydroxide ion, [OH-], of 7.34 X 10-³ M. The pH of a solution can be calculated as follows;
pH = - log {H}
pH = - log 0.00734
pH = 2.134
pOH = 14 - 2.134 = 11.87
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Some atoms bond and others do not. What determines whether or not an
atom will bond with atoms of other elements?
please help
Answers
A solution is prepared by adding 91.9 g of ethanol, ch3ch2oh, to 481.0 ml of water. the final volume of the solution is 597.5 ml. assuming the density of water is 1.0 g/ml and the density of ethanol is 0.789 g/ml, calculate the molality of the ethanol in the solution.
Answers
Answer:
17.51M
Explanation:
first we make out what we've been given .
Mass of ethanol= 91.9g
volume of water = 481.0ml
volume of solution= 597.5ml
density of water = 1.0g/ml
density of ethanol= 0.789g/ml.
firstly find the volume of ethanol since the total volume of the solution is 597.5ml and we've been given the volume of water which is 481.0ml , we subtract the volume of water from the volume of the solution , to find out the volume of ethanol .
volume e =597.5ml - 481.0ml
= 116.5ml
Then we find the molecular mass of ethanol , which is 45.04g/mol .
then we find the number of moles of ethanol .
n=mass /molar mass
=91.9g/ 45.04g/mol
=2.04mols .
Then convert the volume from milliliters to liters , by dividing by a 1000 .
v= 116.5/1000
=0.1165L
since we have our number of moles and volume , we can now find the molarity . which is
M=n/v
= 2.04mols /0.1165L
= 17.51M .
lead can react with oxygen gas. If lead (IV) oxide is the product of the reaction, how would the reaction be classified
Answers
Answer:
this reaction is an oxidation reaction
The chemical reactions involving both oxidation and reduction are known as redox reactions. The oxidation involves the loss of electrons. The reaction of lead with oxygen is an example of oxidation reaction.
What is oxidation reaction?According to the classical concept, oxidation is defined as a process which involves the addition of oxygen or electronegative element or the removal of hydrogen or electropositive element.
During electron transfer, the species which loses electrons is said to be oxidized and the species which gains electrons is said to be reduced.
The lead (IV) oxide is the formula of PbO₂. Here the oxidation state of lead is +4. The lead (IV) oxide is used in manufacturing dyes and also used to make explosives. It is a corrosive outcome that can evolve in lead pipes that are used for drinking water.
The formation of lead (IV) oxide is given as:
Pb (s) + O₂ (g) → PbO₂ (g)
Thus the reaction is an oxidation reaction.
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Question 2 (1 point) The chemical formula for an ionic compound represents the a b number of ions in each molecule. total number of ions in the crystal lattice. number of atoms in each molecule simplest ratio of ions that results in an electrically neutral compound.
Answers
The chemical formula for an ionic compound represents the simplest ratio of ions that results in an electrically neutral compound. That is option D.
What is an ionic chemical compound?An ionic chemical compound is defined as the type of chemical compound that contains both the oppositely-charged ions of a metal and a nonmetal are attracted reacting with each other to form an ionic bond.
When represented as a chemical formula, it is the simplest ratio of ions that results in an electrically neutral compound.
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how many element are there on the periodic table?
Answers
Answer:118
Explanation: it’s right
Answer:
118 elements
Hope that helps
how many kilograms are 129.569grams?
Answers
0.129569. You have to divide the mass value by 1000.
Identifying Variables in the Effect of Type of Material on
Absorption Experiment
Answer the questions using the drop-down menus.
Which is the independent variable in this experiment?
Which is the dependent variable in this experiment?
Which is a controlled variable in this experiment?
Answers
In Absorption Experiment,
Water location is the independent variable in this experiment.
Room Temperature in the material is dependent variable in this experiment.
Type of a material is a controlled variable in this experiment.
What is Absorption Experiment ?Absorption experiment is nothing but the experiment of absorption of water in a material (sponge).
Experiment requires vessel, water and sponge.
Processor - take a vessel, pour water into it and dip sponge. take out the sponge. After taking of out sponge, water appears to be decreased from the vessel and sponge gets heavier. When we squeeze the the sponge, water drops down. It is because of water is absorbed by the spouge.
There are number of pores in the sponge, which absorbs the water.
Water location is the independent variable.
In this experiment Room Temperature is dependent variable in this experiment rate of absorption increases with increase in the temperature. decrease in the temperature cause to solidify the water. Type of a material is a controlled variable, we can change type of the material.
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Two scientists are debating how to classify a new animal species that they have discovered. They observe that the animal is capable of producing sperm.
What statement would they most likely make about the new species?
Answers
Answer:
This animal produces offspring that are genetically different from itself.
Explanation:
Answer:
answer is A
This animal produces offspring that are genetically different from itself.
Explanation:
hope this helps!
1- Give the chemical formula for trans-dichlorobis(ethylenediamine)platinum(IV). Use (en) as the symbol for ethylenediamine.
2- Give the systematic name of this coordination compound.
Na[Al(OH)4]
Answers
1.trans-[Pt(en)2Cl2]2+
2.coordination compound Na [Al (OH)] systematic name: sodium tetrahydroxidoaluminate (III)
For several industrial and technical applications, sodium aluminate serves as an efficient supply of aluminum hydroxide. A white crystalline solid with the chemical formula NaAlO2, NaAl(OH)4 (hydrated), [2] Na2OAl2O3, or Na2Al2O4, pure sodium aluminate (anhydrous) is a white substance. Both a solution and a solid form of sodium aluminate are sold commercially.Other comparable compounds, often referred to as sodium aluminate, include Na5AlO4 and Na7Al3O8, which contain complex polymeric anions and Na17Al5O16 and NaAl11O17, which was originally wrongly thought to be -alumina, a phase of aluminum oxide.Aluminum chloride, sodium chloride, and water are produced when hydrogen chloride and sodium tetrahydroxoaluminate interact. Diluted hydrogen chloride in a solution form.
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