Answer:
f
Explanation:
The structures of two allotropes of carbon are represented above. Which of the following statements best helps explain why diamond is much harder than graphite?
answer choices
Diamond contains covalent bonds, whereas graphite contains ionic bonds.
Diamond contains ionic bonds, whereas graphite contains covalent bonds.
Carbon atoms in diamond have four covalent bonds, whereas graphite is made of layers that are held together by relatively weak dispersion forces.
Carbon atoms in diamond have a sea of mobile electrons that make the structure strong, whereas graphite does not contain delocalized electrons.
The given question is incomplete. Hence, can not be answered. Still, adding some relevant information for your reference.
What are allotropes?
Allotrope or allotropism is the property of some chemical elements existing in two or more different forms in the same physical state, known as allotropes of the element. Allotropes are different structural modifications of an element. Atoms of elements are connected to each other in different ways. Examples of carbon allotropes include diamond (carbon atoms bonded together to form a cubic tetrahedral lattice), graphite (carbon atoms bonded together in layers in a hexagonal lattice), graphene (individual layers of graphite), and fullerenes (these where the carbon atoms are bonded in a spherical, tubular, or ellipsoidal fashion).
The term allotrope is used only for elements, not for compounds. A more general term used for any chemical compound is polymorphism, but its use is usually limited to solid materials such as crystals. Allotropes refer only to different forms of an element within the same physical phase (state of matter such as solid, liquid, or gas). Differences in these states of matter are not the only examples of allotropes. Allotropes of chemical elements are often called polymorphs or phases of the element.
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What is the atmospheric pressure if the partial pressures of nitrogen, oxygen, and argon are 77.75 kPa,
19.94 kPa, and 1.999 kPa, respectively?
Answer:
The answer is P(AR) 27Kpa
Draw a Lewis structure for NHF2 in which the central N atom obeys the octet rule, and answer the following questions based on your drawing.The number of unshared pairs (lone pairs) on the central N atom is:The central N atom forms ______ single bonds.The central N atom forms ______ double bonds.Draw a Lewis structure for CO2 in which the central C atom obeys the octet rule, and answer the following questions based on your drawing.The number of unshared pairs (lone pairs) on the central C atom is:The central C atom forms ____ single bonds.The central C atom forms ____ double bonds.
The formation of molecule can easily be shown by drawing Lewis dot structure. Since atom's Lewis dot structure has three dots. Therefore, the number of unshared electron on N is 2 and shared electrons is 6.
What is Lewis dot structure?Lewis dot structure is a way to represent the valence electron of an element in the form of dot. These are mainly beneficial in understanding the chemical formula of covalent compound.
In compound NHF[tex]_2[/tex], N belongs to group 15 with 5 electrons. 3 electrons will be used in making bond with one electron of F and one electron of H. Now 2 electrons are left on the N. So now N has 1 lone pair and 3 bond pair. The geometry will be tetrahedral and shape will be pyramidal.
Therefore, the number of unshared electron on N is 2 and shared electrons is 6.
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How do homologous structures provide evidence that species may be changing over time?
Analogous structures demonstrate that identical selective pressures might result in similar adaptations, whereas homologous structures indicate evidence for shared ancestry.
With an example, what is homologous series?A group of chemical compounds with the same functional group is referred to as a homologous series. As a result of sharing an active group, the molecules have comparable chemical characteristics. The homologous series often includes alkanes, cycloalkanes, and alkenes.
What do you mean by homologous?adjective. matching, as in relative position or structure; having the same or a comparable relationship. Similar in origin and structure but perhaps not always in function: A horse's foreleg and a bird's wing are analogous.
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Which of the molecules regulate the enzyme that catalyzes malonyl‑coa synthesis?
a. fatty acids or fatty acyl-CoA
b. carnitine
c. oxaloacetate
d. acetyl-CoA
e. citrate
Acetyl-CoA, the molecules regulate the enzyme that catalyzes malonyl‑coa synthesis.
Acetyl-CoA carboxylases (ACCs) are the enzymes that catalyze acetyl-CoA carboxylation to create malonyl-CoA. ACC1 and ACC2 are two members of the ACC group in the mammals.
ACC1 is found in the cytosol and it is the first and most important enzyme in the de novo fatty acid production pathway.
ACC2 is found on the outer membrane of mitochondria and produces malonyl-CoA to regulate the activity of carnitine palmitoyltransferase 1 (CPT1), which is involved in the fatty acid -oxidation.
So, Malonyl-CoA is synthesized from the Acetyl-coA in presence of Acetyl-CoA carboxylases (ACCs).
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Draw the major organic product of the reaction shown. HI OH
There are so many types of chemical reaction reaction like combination reaction, double displacement reaction, nucleophilic substitution reaction etc. Therefore, the major organic product of the reaction shown is 2-Iodo-2,3-dimethylbutane.
What is nucleophilic substitution reaction?
One nucleophile substitutes another in a family of organic reactions known as nucleophilic substitution reactions.
SN1 stands for nucleophilic substitution reaction. Leaving group, a nucleophile, electrophile and a solvent are present. The first step is the slowest because a bond is being broken to form carbocation by the attack of hydrogen ion from the HI acid. Then carbocation rearrangement takes place. Attack of iodide ion to form product 2-Iodo-2,3-dimethylbutane.
Therefore, the major organic product of the reaction shown is 2-Iodo-2,3-dimethylbutane.
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How do the atoms share electrons in molecule formation so that each atom appears to have a noble gas electron configuration? describe an example.
An essential component of chemistry are atoms. Covalent bond are necessary for atoms to reach the noble gas configuration because sharing electrons makes them stable.
A covalent bond is a type of chemical relationship where the atoms share electron pairs in order to create a compound or molecule.
Covalent bonding happens when atoms share electron pairs. Atoms join together through covalent bonds to form a full electron shell, which boosts stability. By sharing their outermost (valence) electrons, atoms can fill out their outer electron shell and become stable. Even though it's a frequent misconception, atoms don't always disperse their electrons equally when they establish covalent connections.
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What would be the final temperature of a 50g of 20c water and 50g of 40c water?
The final temperature of the mixture of 20c and 40c water would be 30c.
What is temperature?Temperature is a physical property of matter that quantitatively expresses the common notions of hot and cold.
This is due to the law of conservation of energy, which states that the total energy of a closed system remains constant. The total energy of the two waters together is the same, so the final temperature must be the average of the two. The total mass of the two waters is 100g, and the temperature difference between them is 20c.
So, the final temperature of the mixture is 20c + (20c/100g) x 50g = 30c.
This principle is also known as the "law of mixing temperatures" and is used in many scientific and engineering applications. For example, it is used to calculate the temperature of a mixture of two fluids, or to calculate the cooling of a hot object in a room.
This law can be further extended to mixtures of more than two fluids, as long as the total energy of the system is conserved. This means that the total mass, the specific heat capacity of each fluid, and the temperature of each fluid must all be known in order to calculate the final temperature. This can be a useful tool in engineering applications, such as the cooling of a computer chip or the heating of a room.
In summary, the final temperature of a mixture of two fluids, such as the 50g of 20c and 50g of 40c water, is the average of the two temperatures. The final temperature of the mixture is 30c.
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Why are chemical symbols used in chemistry?
Chemical symbols are used to quickly identify the elements and atoms in a chemical formula and to standardize the "language of science."
What are the benefits of chemical symbols in chemistry?Chemical symbols are useful for describing chemical elements since they save time by allowing you to record chemical formulas without having to type out each element's full name. Numerous molecules, especially organic ones, include atoms from a wide range of various elements.
What purpose does symbol use serve?Symbols, such as gestures, signs, objects, messages, and words, help people to grasp that world. They offer widely accepted meanings that act as guides for comprehending experiences and are shared by groups.
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What is the purpose of the proton H+) concentration gradient created across the mitochondrial membrane?
The electrochemical proton gradient across the inner mitochondrial membrane is basically used to drive ATP synthesis during the critical process of oxidative phosphorylation.
In a mitochondrial membrane, a proton gradient is formed when the proton concentration outside the membrane is greater than the inner membrane which is inside the membrane. The gradient develops as a result of the respiration's electron transport chain.
The electrochemical proton gradient drives ATP synthesis via the enzyme ATP synthase. ADP and Pi are combined to generate an ATP molecule because protons pass via the enzyme ATP synthase. Protons flow down towards their concentration gradient into the matrix via membrane protein ATP synthase which causes it to spin (like a water wheel) and catalyze conversion of ADP to ATP.
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Who introduced the symbols we use in chemistry today?
J.J. Berzelius, a Swedish scientist, advocated in 1813 that chemical symbols be based on the Latin names of the elements; by the middle of the 19th century, this idea had gained widespread acceptance.
How did the symbols come to be?Symbols for chemical elements are abbreviated notations that are derived from their scientific names, such as S for sulfur and Si for silicon. Sometimes the sign comes from the Latin term; for example, Au stands for aurum, or gold, and Na stands for natrium, or sodium.
What year did symbols begin?Ancient beings first began scratching lines and hashtag patterns onto red rocks in a South African cave over 100,000 years ago. Such craftsmanship has been claimed as the first indication that our species was capable of producing symbols—clear signs that stand for a particular meaning—and as such, proof of a developed mind.
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which point on the potential energy diagram corresponds to the species below for the reaction of 2-methylpropene with hydrogen chloride?
The point B is the diagram in which it has the Highest maximum energy level shown Here For the reaction of 2-methylpropene with hydrogen chloride.
The least strong conformation is the eclipsed conformation in which the methyl and the hydrogen atom are gift near every different and enjoy pressure repulsion on every different.
This ends in steric difficulty and makes the molecule unstable.Isobutylene (or 2-methylpropene) is a hydrocarbon with the chemical formula (CH3)2C=CH2. It is a 4-carbon branched alkene (olefin), one of the 4 isomers of butylene.2−methyl propene is greater reactive with HCl than propene as the +I impact of methyl businesses makes double bond greater electron wealthy and for the duration of electrophilic addition, a tertiary carbocation intermediate is received that's greater strong than secondary carbocation intermediate.
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how is a new element formed in a star?
Answer:
Some of the heavier elements in the periodic table are created when pairs of neutron stars collide cataclysmically and explode, researchers have shown for the first time. Light elements like hydrogen and helium formed during the big bang, and those up to iron are made by fusion in the cores of stars.
Explanation:
Answer: Some of the heavier elements in the periodic table are created when pairs of neutron stars collide cataclysmically and explode, researchers have shown for the first time. Light elements like hydrogen and helium formed during the big bang, and those up to iron are made by fusion in the cores of stars.
Explanation:
A forensic scientist is attempting to identify a type of plastic found at a crime scene. What test could she conduct on the plastic to observe its chemical properties?.
By putting acid on the plastic and observe how it reacts, the chemical properties might be discovered.
Acids normally do not cause any reaction with plastics, and due to this reason plastic container are used to store acid.
Describe chemical propertiesChemical properties are those properties that could observed when a substance undergoes chemical change. during chemical properties one substance changes to another substance.
If the atoms of a molecule are rearranged, the substance is said to have undergone a chemical reaction. This would eventually result in the synthesis of a new chemical.
The forensic scientist is now interested in the plastic's chemical composition. reaction of acid and the plastic could be used to do this.
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what are the units of the rate constant for each of the reactions in table 12.2 in the textbook?
The order of the reaction is a measure of actual moles of reactant taking part in the reaction to form any product. The unit of rate constant are specific for order and type of reaction.
The power dependence of rate on the concentration of all reactants can be used to define the sequence of reaction. For instance, the concentration of one species in a first-order reaction determines the reaction's pace entirely. The number of species whose concentration directly influences the rate of reaction is represented by the order of reactions. It can be found by summing all of the exponents in the rate expression for the concentration terms. The stoichiometric coefficients corresponding to each species in the balanced reaction do not affect the order of the reaction. Chemical reactions are always defined by the concentrations of the reactants, never by the concentrations of the products.
Hence, rate constant unit depend on the order of the reaction.
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during glycolysis two moles of are generated for one mole of glucose? a) glycerate-1,3 bisphosphate b) glycerate-3-phosphate c) phosphoenolpyruvate d) all of the above are correct e) none of the above are correct
All of the aforementioned are incorrect if glycolysis produces two moles of for every mole of glucose.
D is the ideal choice.
What creates two molecules during glycolysis?Firstly, glycolysis yields two ATP, two NADH, and two pyruvate molecules. The aerobic catabolic breakdown of glucose known as glycolysis yields energy in the form of ATP, NADH, and pyruvate, which then enters the citric acid cycle to yield more energy.
From 2 moles of glucose, how many ATP are produced?76 ATP molecules can therefore be produced from two glucose molecules. Glycolysis. Two moles of ATP are created anaerobically for every mole of glucose.
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Is freezing point elevation or depression?
Freezing point depression is the reduction in the freezing point of a liquid caused by the addition of a non-volatile solute.
What is non-volatile solute?A non-volatile solute is a molecule or compound which does not easily vaporize at a given temperature and pressure. This type of solute does not evaporate into the air and instead remains in solution. Common examples of non-volatile solutes are salts, sugar, acids, bases, proteins, and other molecules. In comparison to volatile solutes, non-volatile solutes tend to remain in solution and are not readily removed by evaporation. This type of solute is also known as a “non-volatile ion”. Non-volatile solutes can be beneficial in certain applications, such as in food preservation, as they are able to provide flavor, color, and texture to food products. Non-volatile solutes can also be used in chemical engineering and pharmaceutical processes, as they can help control pH levels, improve solubility, and enhance stability of products.
When a non-volatile solute is added to a solvent, the vapor pressure of the solvent decreases, and the freezing point of the solvent is depressed. The freezing point is the temperature at which the liquid phase of a substance changes to the solid phase.
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Part A Spell out the full name of the compound. Submit Request Answer Part B Spell out the full name of the compound. Submit Request Answer Part C Br Spell out the full name of the compound. Submit Request Answer Part D Spell out the full name of the compound. Submit Request Answer Part E Spell out the full name of the compound. Submit Request Answer Part F Spell out the full name of the compound. Submit Request Answer
The name of the compound comprises of both the cation and anion part with most of the time the anionic part ending with suffix-ide.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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Draw lewis structure for BrF4-b What is the electron-pair geometry for Br in BrF4- ?c What is the the shape (molecular geometry) of BrF4-?
The shape (molecular geometry) [tex]BrF^{-}_{4}[/tex] is square planar.
Start with the tetrafluoroborate ion's Lewis structure, [tex]BrF^{-}_{4}[/tex]. A total of 36 valence electrons will be present in the molecule: 7 from bromine, 7 from each of the four fluorine atoms, and one additional electron to give the ion its negative charge.
For a total of 8 of the 36 valence electrons, the bromine atom will form single bonds with each of the four fluorine atoms. The number of valence electrons needed will increase to 32 since the fluorine atoms will each have three lone pairs connected. On bromine, the remaining 4 valence electrons will be arranged as lone pairs.
Four single bonds and two lone pairs make up the six areas of electron density that surround the bromine atom, making its steric number equal to six.
The molecular geometry will be square planar, or [tex]AX_{4}E_{2}[/tex], according to VSEPR Theory.
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Is it OK to drink out of pewter?
It is advised not to use pewter for hot beverages like tea, coffee, or even hot toddy because pewter melts at a comparatively low temperature compared to other metals.
What is Pewter?Pewter is an alloy mostly composed of tin, with varying quantities of hardening elements such as antimony, bismuth, copper, and lead.Modern pewter is totally safe to use for food and drink. Pewter used to include a little bit of lead, but that hasn't been the case in a very long time. All of our pewter products are made of lead-free pewter, making them suitable for use with food and beverages.Never put anything made of pewter in an oven, on a hot plate, or close to a flame.For more information on pewter kindly visit to
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Assertion: An object floats if it displaces an amount of liquid whose weight is greater than the actual weight of the object.
Reason: During floatation an object experiences no net force in the downward direction.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false. (d) Assertion (A) is false but reason (R) is true
(d) Assertion (A) is false but reason (R) is true
Based on the assertion and the reason regarding the weight of an object and upthrust experienced by the body in a fluid; Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
The correct option is A.
What is the principle of floatation?The principle of floatation states that an object will float in a fluid if the upthrust that is experienced by the object is equal to or greater than the weight of the object.
The upthrust experienced by a body is the upward force that a liquid or gas exerts on a body floating in it.
Upthrust on a body depends on the acceleration due to gravity, the density of the liquid, and the volume of the body immersed in the liquid.
The weight of a body is the force of gravity acting on the body. The weight of a body acts downward.
Thus in a fluid, the weight of an object acts downward while the upthrust on the object acts in an upward direction.
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What elements can bond with oxygen?
With the exception of the noble gases helium, neon, argon, and krypton, oxygen is reactive and will produce oxides with all other elements.
Can elements and oxygen combine?When an element interacts with oxygen, a variety of oxidation states and potential chemical compounds can result. Cellular respiration and photosynthesis are just two biological activities that involve oxygen in numerous reactions.
How many different substances can oxygen connect with?Oxygen can only generate two bonds because it needs two additional electrons to complete its octet, after which it will run out of empty orbitals in which to receive additional electrons and create additional bonds. Oxygen and sodium will combine to generate an ionic compound.
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consider a fuel cell that uses the reaction ch4(g)+2o2(g)→co2(g)+2h2o(l)
The value of E° for the cell reaction is 1.06 V.
The cell reaction is indeed the overall reaction that occurs in the cell, written with the assumption that right hand electrode is indeed the cathode, i.e. that the spontaneous reaction occurs in the right-hand compartment.
The cell would be represented by rule that metals have been written first, followed by metal ions found in the electrolyte. And they must be kept separate by the a vertical line.
Given,
CH4 + 2O2 → CO2 + 2H2O
ΔG° rn = ΔG° of products - 2ΔG° of reactant
= {ΔG° of CO2 + 2ΔG° of H2O} - {ΔG° of CH4 + 2ΔG° of O2}
={[-394.38 + 2(-237.18)] - [-50.85 + 2(0)]}
= -817.89 KJ/mole
We know that,
ΔG° = -nFE° cell
⇒ E° cell = ΔG°/-nF
⇒ = (-817.89 x 10^3 j/mole) / 8 x 96500
E° cell = 1.06 V
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a photon with energy 2.92 ev is absorbed by a hydrogen atom. (a) find the minimum n for a hydrogen atom that can be ionized by such a photon. 3 correct: your answer is correct. (b) find the speed of the electron released from the state in part (a) when it is far from the nucleus. incorrect: your answer is incorrect.
The electron will be released from the atom and become ionized if a photon has greater energy than the electron's binding energy.
How much photon energy does a hydrogen atom require to ionize before it leaves its ground state?E1=13.6 eV is the minimal amount of energy needed to break free of the ground state. E 1 = 13.6 e V . Here, E stands for the overall energy needed to ionize an atom of hydrogen.
What energy level does a photon need to be at in order to ionize a hydrogen atom from the n 3 energy level?The formula En=2.181018n2 J/atom denotes the minimal amount of energy required to ionize an electron from a hydrogen atom's nth Bohr orbit in Joules per atom.
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What element is located on the left side of the table?
Answer:
Metals
Explanation:
right answer
How do you respond to a chemical exposure to the eye?
Do these things right away when a chemical splashes on your eye.Use water to irrigate your eye.For the at least 20 minutes, use pristine, lukewarm tap water.Use soap and water to wash your hands.To ensure that no chemicals or soap are still on your hands, thoroughly rinse them.Remove your contacts.
How might chemical spills be avoided?Safety Glasses, goggles, and shields — These products shield the face and eyes from chemical spills.Additionally, they protect them against gases, vapors, and dust.Skin Protection - Clothing items like gloves, boots, & coveralls should be used in order to protect the skin.
A chemical splash accident is what kind of mishap?Chemical splashes are incidents where dangerous substances unintentionally spill, project, aerosolize, or otherwise disseminate inside a laboratory setting.
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What are the 5 valence electrons?
Explanation:
Elements that have five valence electron are the group 15 element's. Those elements includes Nitrogen (N), Phosphorus (P), Arsenic(Ar) and Antimony (Ab).
How many grams of sucrose should be dissolved in 100g water in order to produce a solution?
To determine the amount of sucrose that should be dissolved in 100g water to produce a solution, you must refer to the solubility of sucrose.
What is solution?Solution is an answer or a set of answers to a problem or question. It is typically a result of problem-solving that can be logical, practical, or creative. Solutions are often developed through discussion, brainstorming, and collaboration in order to develop the best possible outcomes. Solutions are often unique, and the process of finding them can be complex.
The solubility of sucrose at room temperature is approximately 186 grams of sucrose per 100g of water. Therefore, to produce a solution, 186g of sucrose should be dissolved in 100g of water.
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What is the freezing point of 0.20 M sucrose?
The freezing point of sucrose solution is −0.372∘C
What is freezing point?
When the temperature of a liquid falls below its freezing point, it transforms into a solid. According to the internationally accepted definition, freezing is the solidification phase change of a liquid or the liquid content of a substance caused by cooling.
Most substances have the same melting and freezing points; however, certain substances have different solid-liquid transition temperatures. Agar, for example, exhibits hysteresis in its melting and freezing points. It melts at 85 °C (185 °F) and solidifies at 32 °C to 40 °C (89.6 °F to 104 °F).
Hence, the freezing point of sucrose solution is −0.372∘C
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what stereoisomers are obtained when (s)-3-methyl-1-pentene reacts with cl2?
The stereoisomers obtained when (S )-3-methyl-1-pentene reacts with are (2S ,3S )-1,2-dichloro-3-methylpentane and (2R ,3S )-1,2-dichloro-3-methylpentane.
In stereochemistry, stereoisomerism is a kind of isomerism in which molecules have the same chemical formula and sequence of connected atoms but differ in the three-dimensional orientations of their atoms in space.
When various groups of molecules connected to a central core have different relative orientations, stereoisomers develop. R-thalidomide and S-thalidomide are stereoisomers. Enantiomers are mirror images of one another that cannot be overlaid. Enantiomers that are mirror reflections of one other are referred to as stereoisomers. Diastereomers are also non-superimposable, despite the fact that they are not mirror images of each other. Stereoisomers and Diastereomers are not mirror images of one other.
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