The volume that is occupied is 22.4 L
What is the definition of the mole?The mole allows for the conversion of the mass of a substance to the number of entities it contains, and vice versa, through the use of its molar mass, which is the mass of one mole of the substance. The mole is a convenient unit for expressing amounts of substances in chemical reactions, as it provides a way to relate the mass of a substance to its number of entities, such as atoms or molecules.
If one mole of oxygen contain 6.02 * 10^23 moles
x moles would contain 6.70 x 10^22 molecules
x = 1 mole
Then the volume that is occupies is 22.4 L
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What element is in period 4 and has 5 neutrons in its most common isotope?
The neutrons are sub atomic particles. The particles which are smaller in size than an atom is known as sub atomic particles. The isotope of beryllium with mass number 9, i.e., ⁹Be has 5 neutrons.
What is isotope?The isotopes are defined as the chemical elements which have the same atomic numbers but different mass numbers. In isotopes, the number of neutrons differ from the number of protons. The physical properties of the elements are different.
'Be' has 3 isotopes, they are ⁷Be, ⁹Be and ¹⁰Be. Among these isotopes, ⁹Be is found to have 5 neutrons and 4 protons or electrons.
Thus ⁹Be is the most common isotope with 5 neutrons.
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who said energy levels are located certain distances from the nucleusA. DaltonB. ThomsonC.RutherfordD. Bohr
The correct answer is (D) Bohr. In 1913, Niels Bohr proposed the Bohr model of the atom, which introduced the idea that electrons occupy certain energy levels are located at specific distances from the nucleus of the atom.
Niels Bohr proposed the Bohr model of the atom, which introduced the idea that electrons occupy certain energy levels, or shells, that are located at specific distances from the nucleus of the atom. He proposed that electrons can only exist in these specific energy levels, and that they can transition between levels by absorbing or emitting energy in the form of photons. The Bohr model of the atom was significant because it provided a theoretical explanation for the atomic spectra that were observed in experiments, and it represented a significant advancement in our understanding of the structure of the atom. However, it was later refined with the development of quantum mechanics, which provided a more accurate description of atomic structure.
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What is the signal observed at ppm carbon nmr residual?
In carbon nuclear magnetic resonance (NMR) spectroscopy, the signal observed at 0 ppm corresponds to the chemical shift of the carbon atom in tetramethylsilane (TMS) used as a reference standard.
Parts per million (ppm) of the NMR spectrometer frequency are used to describe the chemical shifts of additional carbon atoms in a sample relative to the TMS signal. The electron density around the carbon atom, the hybridization of the carbon atom, and the makeup of the nearby atoms or functional groups are only a few of the variables that have an impact on chemical changes. As a result, the chemical shift of a particular carbon atom can provide details about the surroundings and structure of the molecule it is a part of.
The "residual peak" or "residual solvent peak" is another name for the signal seen in carbon NMR spectroscopy at 0 ppm.
Any leftover solvent molecules in the NMR sample might cause a signal to appear.
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Arrange the following carboxylic acids in order of decreasing acidic nature:
Oxalic acid (I), Malonic acid (II); Succinic acid (III)
a. I-II-III b. III-II-I C. II-III-I D.II-I-III
Option D, II-I-III.The acidic nature of carboxylic acids can be estimated by their dissociation constant, Ka. The larger the Ka value, the stronger the acid.
Malonic acid (II) is a stronger acid than succinic acid (III) due to the presence of two COOH groups in its molecular structure. Oxalic acid (I) is the weakest acid of the three due to its small molecular size.
Carboxylic acids are organic acids that contain a carboxyl group (-COOH) in their molecular structure. The acidic nature of carboxylic acids can be estimated by their dissociation constant, Ka, which is a measure of the strength of an acid in solution. The larger the Ka value, the stronger the acid. Malonic acid (II) has the formula CH2(COOH)2. It contains two carboxyl groups in its molecular structure, making it a stronger acid than succinic acid (III), which has the formula CH2(COOH)CO2H. The presence of two carboxyl groups in the molecular structure of malonic acid increases the number of hydronium ions produced when it dissociates in water, making it a stronger acid. Oxalic acid (I) has the formula C2O2H2. It is the smallest of the three carboxylic acids and has the weakest acidic nature. This is because it has only one carboxyl group in its molecular structure and its small molecular size makes it less likely to dissociate in water, resulting in a smaller Ka value.
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Select the compound with the greatest surface tension in the liquid phase.a. NBr3b. NF3c. NCl3
NCl₃ has the greatest surface tension in the liquid phase. Option c is correct answer.
The compound with the greatest surface tension in the liquid phase is the one that has the strongest intermolecular forces of attraction.
Among the given options, NBr₃ and NCl₃ are both polar molecules with a trigonal pyramidal molecular geometry. The N-F bond in NF₃ is more polar than the N-Br and N-Cl bonds, but the molecule has a trigonal pyramidal molecular geometry.
Therefore, NCl₃ has the strongest intermolecular forces of attraction, and thus the greatest surface tension in the liquid phase, due to the greater size of the chlorine atom compared to the bromine and nitrogen atoms, which results in a larger surface area and stronger intermolecular forces of attraction.
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why genshin impact the gourmet supremos the importance of eating well?
Players have to first entire the Gourmet Supremos: Breakthrough Thinking every day fee quest first earlier than The Importance Of Eating Well will display up as available.
As quickly as you have finished Breakthrough Thinking, Parvaneh will display up in Inazuma City. She may be discovered close to Inazuma's Adventurers' Guild. The Gourmet Supremos is a sequence of World Quests and Commissions in Inazuma and Sumeru. It revolves across the titular Gourmet Supremos, a collection of 3 human beings from round Teyvat with an hobby in nearby cuisines. For the cutting-edge first-rate revival meals in Genshin Impact, not anything can beat the Crab, Ham & Veggie Bake (forget about the lacking Oxford comma). It's additionally referred to as the Baked Vegetable Pie. This cute morsel revives any downed man or woman and heals them.
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What is a simple definition of anion?
Anion is defined as an ion which contains negative charge.
An anion may be defined as an atom or molecule that is negatively charged. A cation is usually defined as an atom or molecule that is positively charged and carries a + charge with it.
Some of the properties of anion are given below:
Anion have a negative charge.Anion is formed by gain one or more electrons.Anion tends to act as weak bases.Anion is usually formed from non-metal elements.Anion are usually attracted to cations.Anions generally play an vital role in a wide variety of chemical and biological processes that takes place in our body. Let's consider an example, chloride ion, which is an ubiquitous ion that present in our body fluid is an anion.
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is nacl soluble in water
Yes NaCl is soluble in water.
A chemical compound with a chemical formula NaCl is sodium chloride. Strong sodium ions paired to un favourable chloride ions make form salt (Sodium chloride).
Solubility:
Water may dissolve salt because the positive part of its molecules attracts the negative chloride ions and the negative part of its molecules attracts the positive sodium ions.
The lattice of sodium chloride (NaCl), on the other hand, dissociates into individual ions when it dissolves in water, and these ions are then solved (wrapped) in a layer of water molecules.
NaCl is still thought to dissolve in water because crystalline NaCl can be recovered via solvent evaporation.
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when silver carbonate dissolves in water, what ions are produced?
When the silver carbonate dissolves in the water, the ions are produced are Ag⁺ and CO₃²⁻.
The chemical compound ,silver carbonate with the chemical formula that is Ag₂CO₃ is very poorly soluble in the water. The color of the compound silver carbonate is yellow color. It is the transition metal carbonate that is the reason it will not dissolve properly in the water. The very small amount of the silver carbonate is soluble in the water. The silver carbonate is sparingly dissolves in the water.
Thus, Ag⁺ and CO₃²⁻ ion are are produce if we dissolve the solid silver carbonate in to the water.
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What is acid catalyzed hydration ?
Acid catalyzed hydration is a reaction that involves the addition of water to an alkene in the presence of an acid catalyst. The reaction is typically carried out using a strong acid, such as sulfuric acid, which allows the reaction to proceed more quickly and efficiently.
The general reaction is as follows:
R-CH=CH-R + H₂O → R-CH(OH)-CH-R
In this reaction, the alkene undergoes an addition reaction, in which the double bond is broken and two new bonds are formed. One of the new bonds is formed between the alkene and a hydrogen atom from the water molecule, while the other is formed between the alkene and a hydroxyl group from the water molecule.
The acid catalyst plays an important role in this reaction by increasing the electrophilicity of the alkene, which allows it to react more readily with the water molecule. The acid catalyst also helps to stabilize the intermediate species that are formed during the reaction, which helps to drive the reaction forward.
Overall, acid catalyzed hydration is an important reaction in organic chemistry, and is used to produce a variety of different compounds, including alcohols and other functionalized molecules.
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Question:
What is the molar mass of KMnO4?
Molar Mass:
Molar mass is the number of grams of a substance that equals one mole or 6.02x1023 molecules, also known as Avogadro's number. Molar mass can be used to convert between moles and grams, denoted by g/mol.
The molar mass of a Potassium permanganate molecule, KMnO₄ is equals to the 158.04 g/mol.
We have a Potassium permanganate molecule, KMnO₄. It consists one atom of potassium, one atom of Manganese and four atoms of oxygen. The mass of one mole of a substance is called its molar mass. Molar mass of a molecule is calculated by the addition of the masses of the individual atoms within the their quantities present in a molecule. So, the molecular mass of KMnO₄, is sum of individual masses of hydrogen, nitrogen and chlorine atoms with number of their atoms. The atomic mass of potassium atom, K
= 39.10 g/mol
The atomic mass of oxygen atom, O = 16 g/mol
The atomic mass of Manganese atom, Mn
= 54.94 g/mol
Now, Molar mass of KMnO₄ = 1× atomic mass of potassium + 1×atomic mass of Manganese + 4× atomic mass of oxygen atom
= 1×K + 1×Mn+ 4×O
= 1×39.10 g/mol + 1×54.94g/mol + 4×16 g/mol
= 39.10 g/mol + 54.94 g/mol + 64 g/mol
= 158.04 g/mol
Hence, the molecular mass of KMnO₄ is 158.04 g/mol.
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For the balanced equation shown below, how many moles of H₂O will be produced, if 0.7209 moles of CO2 are produced?
4C₂H3F + 1102 8CO2 + 6H₂O + 2F2
The number of moles is 0.5 moles.
What is the number of moles?
The number of moles is a measure of the amount of a chemical substance. It is defined as the ratio of the number of entities (such as atoms, molecules, or ions) in a substance to Avogadro's number (approximately 6.022 x 10^23 entities).
The mole is a convenient way to express very large or very small amounts of substances in a compact form, making it an essential tool in the field of chemistry. It is used in chemical calculations and in the determination of the mass or volume of a substance.
We have that;
8 moles of CO2 produced 6 moles of water from the reaction equation
0.7209 moles of CO2 will also produce; 0.7209 * 6/8
= 0.5 moles
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Balance the three equations below by adding the appropriate coefficients on the red lines.
In the text boxes below, count the number of atoms of each element on both sides of the reaction to make sure they are equal.
A balanced equation obeys the law of conservation of mass. The coefficients are the numbers that are added in front of the formulas to balance the equation.
What is a balanced equation?A balanced equation is defined as the chemical equation in which the mass of the products and reactants on either side of the equation will be equal. The number of atoms of each element on both sides of the equation are equal.
1. 4Na + O₂ → 2Na₂O
2. C + 2H₂ → CH₄
3. 2H₂O₂ → 2H₂O + O₂
Thus in the balanced equation, the number of atoms on both sides of the equation are equal.
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Pushing
39N
Pulling
29N
Net Force =
The net force would be 10 N.
What is the net force?Net force, also known as the resultant force, is the total force acting on an object after considering all individual forces acting on it. In other words, it's the sum of all forces that an object is subjected to.
The net force is calculated by adding up all the forces acting on an object in a particular direction and determining the single force that would produce the same effect as all those forces.
In this case, pushing force = 39 N, pulling force = 29 N
Net force = 39 N pushing force - 29 N pulling force
= 10 N pushing force.
In other words, the net force is 10 N pushing.
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What is symbol of microliter ?
The symbol of microliter is μL. It is defined as a unit of volume in the metric system.
Microliter is defined as a unit of volume in the Metric System. The symbol for microliter is μL. The base unit for this is liter and the prefix is micro. The prefix micro is derived from the Greek "mikrós" meaning small and it is symbolized as μ. It denotes a factor of one millionth (10-6) which means that there are 1,000,000 microliters in a liter. The symbol of microliter is μL.
1 μL = [tex]10^{-3}[/tex] μL.
It is a small volume and that is measurable in a typical laboratory. The use of microliter volumes would be in preparation of an electrophoresis sample when isolating DNA or during chemical purification. This is measured and dispensed using micropipettes.
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Which equation represents the second ionization energy of magnesium? Choose one: a) Mg+ (g) + e - â Mg(g) b) Mg +(g) â Mg2+ (3) +e- c) Mg(g) â Mg+ (g) + e- d) Mg(g) â Mg2+ + 2e- e) Mg(g) + e- â Mg- (g) e) Mg2+ (g) + 2e- â Mg(g)
Option b , represents the second ionization energy of magnesium.
What is ionization energy?Ionization energy is often measured in electronvolts (eV) or joules in physics (J). The energy required to ionise a mole of atoms or molecules is given in chemistry as kilojoules per mole (kJ/mol) or kilocalories per mole (kcal/mol), respectively.
Two periodic trends that adhere to the laws of Coulombic attraction are revealed by comparing the ionisation energy of atoms in the periodic table. In a given time, ionisation energy typically increases from left to right (that is, row). In a particular group, ionisation energy typically decreases from top to bottom (that is, column).
The latter pattern is caused by the outer electron shell moving away from the nucleus more and farther, with an additional inner electron shell being added every row as one proceeds down the column.
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who said electrons travel in paths called energy levels
The scientist who proposed that electrons travel in paths called energy levels was Niels Bohr.
In 1913, Bohr introduced the idea of a quantized electron energy in his model of the hydrogen atom. He suggested that electrons occupy specific, discrete energy levels around the nucleus, and that they can jump between these levels by absorbing or emitting energy. The energy levels are sometimes referred to as electron shells, and the further an electron is from the nucleus, the higher its energy level. This model helped to explain the spectral lines observed in hydrogen emission spectra and became a key concept in the development of quantum mechanics. The Bohr model was later refined by subsequent research and theories, but his insight and discovery still play a key role in our understanding of atomic structure.
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What is the molality of a solution formed by dissolving 27. 8 g of lii in 500. 0 ml of water?.
The molality of the solution that is formed by dissolving 27. 8 g of lii in 500. 0 ml of water is 5.56 moles/kg.
Molality is defined as the number of moles of solute per kilogram of solvent. To calculate the molality of a solution, we first need to determine the number of moles of solute in the solution and then divide that number by the mass of the solvent. In this case, the solute is LiI (lithium iodide) and the solvent is water.
The number of moles of LiI can be calculated using its molar mass:
27.8 g of LiI = 27.8 g / (mol/g) = 1.39 moles.The mass of the water can be calculated using its density:
500.0 ml of water = 500.0 ml * (1 kg/1000 L) = 0.5 kg.The molality of the solution is then calculated as follows:
1.39 moles of LiI / 0.5 kg of water = 2.78 moles/kg = 5.56 moles/kg (rounded to 2 decimal places).Learn more about Molality:
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what is achieved through the separation of crude oil?
Crude oil separation is a process that involves separating the different components of crude oil into individual fractions.
This process is usually done at an oil refinery using several different methods, including distillation and fractional distillation. Through the separation of crude oil, individual fractions such as gasoline, diesel, and kerosene are produced, which are then used for various purposes.
The first step in crude oil separation is distillation.
Distillation is a process that involves heating crude oil to a high temperature, allowing it to vaporize and separate into different fractions based on their boiling points. This process is typically done in a distillation tower, which is a large cylindrical vessel with a series of trays that the vapor rises through.As the vapor rises, it cools and condenses, eventually forming liquid droplets that fall onto the trays. The trays are arranged in such a way that the heavier, more dense fractions condense and fall onto the trays at the bottom of the tower, while the lighter, less dense fractions condense and fall onto the trays at the top of the tower. This process is repeated until all of the fractions have been separated.Learn more about Crude oil separation at: https://brainly.com/question/8117126
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What is the name of the compound feO?
The name of the compound feO is Iron(II) oxide
A byproduct of the removal of sulfides from gases using iron oxide. In this procedure, gases are passed over a mixture of wood shavings and iron(III) oxide. spontaneous heating is a possibility. This heat could ignite something. easily started by sparks or heat coming from outside. used in electric furnace steel operations as well as for precipitating copper or lead from solutions of their salts.
FeO can be prepared by the thermal decomposition of iron(II) oxalate.
[tex]FeC_{2} O_{4}[/tex] → FeO + [tex]CO_{2}[/tex]+ CO
The procedure is conducted under an inert atmosphere to avoid the formation of iron(III) oxide [tex](Fe_{2} O_{3} ).[/tex] A similar procedure can also be used for the synthesis of manganous oxide and stannous oxide.
Stoichiometric FeO can be prepared by heating Fe0.95O with metallic iron at 770 °C and 36 kbar
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An analytical chemist is titrating 122.1 mL of a 1.000M solution of nitrous acid (HNO2) with a 0.4000M solution of NaOH. The pK, of nitrous acid is 3.35. Calculate the pH of the acid solution after the chemist has added 344.5 mL of the NaOH solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of NaOH solution added. Round your answer to 2 decimal places.Calculating the pH of a weak acid titrated with a strong base
The pH of the solution after the addition of 344.5 mL of the NaOH solution is 2.09.
What is Titration Reaction?
Titration is a chemical technique used to determine the concentration of a specific substance in a sample. In a titration, a solution of known concentration (the titrant) is slowly added to a solution of unknown concentration (the analyte) until the reaction between the two is complete. The reaction that takes place during the titration is called the titration reaction.
This is a problem of a weak acid titrated with a strong base. We can use the Henderson-Hasselbalch equation to solve it.
First, we need to calculate the amount of nitrous acid that is present in the initial solution before any NaOH is added. We can use the formula:
moles of HNO2 = 1.000 mol/L x 0.1221 L = 0.1221 moles
The balanced chemical equation for the reaction between nitrous acid and sodium hydroxide is:
HNO2 + NaOH -> NaNO2 + H2O
Since the molar ratio between nitrous acid and sodium hydroxide is 1:1, the amount of sodium hydroxide added is also 0.1221 moles.
Now, we can calculate the concentration of nitrous acid and its conjugate base, nitrite (NO2-), after the addition of NaOH. The volume of the final solution is the sum of the initial volumes of the two solutions:
Vfinal = 122.1 mL + 344.5 mL = 466.6 mL = 0.4666 L
The amount of nitrous acid remaining after the addition of NaOH is:
moles of HNO2 remaining = moles of HNO2 initial - moles of NaOH added
moles of HNO2 remaining = 0.1221 moles - 0.1221 moles = 0 moles
All the nitrous acid has been neutralized by the sodium hydroxide. The amount of nitrite formed is equal to the amount of NaOH added:
moles of NO2- = moles of NaOH added = 0.4000 mol/L x 0.3445 L = 0.1378 moles
The total concentration of nitrite is the sum of the initial concentration and the concentration formed by the reaction:
[NO2-]total = [NO2-]initial + [NO2-]formed
[NO2-]total = 0 + 0.1378 moles / 0.4666 L = 0.2956 M
The concentration of nitrous acid can be calculated using the equilibrium expression for the acid dissociation constant, Ka:
Ka = [H+][NO2-] / [HNO2]
We can assume that the concentration of H+ is negligible compared to the concentration of NO2-, so we can simplify the equation to:
Ka = [NO2-]^2 / [HNO2]
Rearranging the equation and substituting the values, we get:
[HNO2] = [NO2-]^2 / Ka
[HNO2] = (0.2956 M)^2 / 4.5 x 10^-4
[HNO2] = 19.43 M
The pH can be calculated using the Henderson-Hasselbalch equation:
pH = pKa + log([A-]/[HA])b
where pKa = 3.35 is the negative logarithm of the acid dissociation constant, [A-] is the concentration of nitrite (the conjugate base), and [HA] is the concentration of nitrous acid (the weak acid).
Substituting the values, we get:
pH = 3.35 + log(0.2956/19.43)
pH = 3.35 - 1.26
pH = 2.09
Therefore, the pH of the solution after the addition of 344.5 mL of the NaOH solution is 2.09.
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In which state of Matter are the Forces of Attraction the Weakest?
The state of Matter in which the Forces of Attraction is the Weakest is the gaseous state.
The forces of attraction that depends on the intermolecular attractions or the repulsions. The intermolecular repulsions are greater in the gaseous state than the intermolecular forces of attraction. The molecules have the more randomness in the gaseous state as compared to other states. The state of matter that has the least intermolecular forces of the attraction is the gaseous state because of the reason they are in random in the motion.
Thus, in the gaseous state of the matter, the Forces of Attraction the Weakest.
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The maximum solubility of ag2co3 in 0. 02 m na2co3 is (ksp of ag2co3 is 8 x 10-12).
The maximum solubility of Ag2CO3 in 0.02 M Na2CO3 is 2 x 10^-5 M.
The solubility of a salt can be calculated using its Ksp (solubility product constant) value and the concentration of the ions present in the solution.
The equation for the solubility of silver carbonate (Ag2CO3) in a 0.02 M sodium carbonate (Na2CO3) solution can be written as:
Ag2CO3 (s) → 2Ag+ (aq) + CO3^2- (aq)
Ksp = [Ag+]^2 [CO3^2-]
Since we know the concentration of Na2CO3 (0.02 M),
we can calculate the concentration of CO3^2- ions in the solution:
Na2CO3 (aq) → 2Na+ (aq) + CO3^2- (aq)
[CO3^2-] = 0.02 M
Plugging these values into the Ksp equation:
Ksp = [Ag+]^2 [CO3^2-]
=> [Ag+]^2 * 0.02
[Ag+]^2 = Ksp / [CO3^2-]
=> 8 x 10^-12 / 0.02
=> 4 x 10^-10
[Ag+] = 2 x 10^-5 M
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Is organic chemistry as a second language helpful?
Yes, Organic Chemistry as a Second Language can be extremely helpful for students who are struggling with the concepts of organic chemistry. This book breaks down the complex principles of organic chemistry into simple, easy-to-understand explanations, which can be especially helpful for students who may have trouble with the more technical language often used in organic chemistry textbooks.
Additionally, the book includes numerous practice problems and step-by-step explanations, which can help students gain a better understanding of the material and improve their problem-solving skills. Overall, Organic Chemistry as a Second Language can be an invaluable resource for students looking to improve their understanding of organic chemistry.
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the composition of homogeneous mixtures is ______________.
The composition of homogeneous mixtures is differ. A salty-water solution, The mixture of water and sugar is an example of a homogenous mixture because both mixtures contain the same proportions of their constituents throughout.
What is meant by homogeneous?Any combination whose composition is constant throughout the entire mixture is said to be homogenous. Since the dissolved salt is spread uniformly throughout the entire salt water sample, the salt water described above is homogenous. In terms of composition or structure, homogeneous mixes are uniform. When table salt is added to water, for instance, the result is homogenous because the salt totally dissolves and the salt granules are dispersed throughout the water. The overall appearance and composition of a homogenous mixture are consistent. Solutions are the term used to describe a wide variety of homogenous mixtures. There are distinct constituents or stages in a heterogeneous combination. Gas, liquid, and solid matter exist in the three phases or states.To learn more about homogeneous refer to:
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Why does the atomic radius decrease on moving left to right along a period?
The atomic radius decrease on moving left to the right along the period because the number of the electrons increases.
The number of the protons and electrons increases and the attractive forces in between the nucleus and the electrons will increase, this leads to the electrons closer to the nucleus and the decreasing the size of the atom. The number of the electrons will increases in the same subshell and the outermost electrons will pulled closer together to the nucleus.
Thus, the atomic radius will decreases as we move from the left to the right across the period in the period table.
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What is ferrous sulfate?
Ferrous sulfate is just one of many forms of the metallic element iron. FeSO4
In its natural state, the solid mineral resembles small crystals. The crystals are usually yellow, brown, or blue-green, which is why ferrous sulfate is sometimes called green vitriol (1).
Supplement manufacturers use several types of iron in their supplements. In addition to ferrous sulfate, the most common are ferrous gluconate, ferrous citrate, and ferrous sulfate.
Most iron in dietary supplements comes in two forms, ferric or ferrous. It depends on the chemical state of the iron atoms.
The body absorbs iron forms better than iron forms. Therefore, health care providers often consider iron-rich forms, including ferrous sulfate, to be the best choice for iron supplementation
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Which of the following have the thickest layer of peptidoglycan in the cell wall?
mycoplasma
gram-positive bacteria
gram-negative bacteria
L-forms
The following have thickest layer of peptidoglycan in the cell wall : gram-positive bacteria
What is the thick layer of peptidoglycan?Thickened peptidoglycan layer in Gram positive cells allows them to retain the stain ( and hence remaining 'stain positive' or 'Gram positive) where as thin layer seen in Gram negative cells cannot prevent the stain from leeching out (and hence stain and Gram negative).
Gram-positive organisms have thicker peptidoglycan cell wall as compared to gram-negative bacteria. It is 20 to 80 nm thick polymer whereas peptidoglycan layer of the gram-negative cell wall is 2 to 3 nm thick and covered with outer lipid bilayer membrane.
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Which amino acids can form hydrogen bonds with water?
The amino acids that can form hydrogen bonds with water are those with polar or charged side chains, which are capable of forming hydrogen bonds with water molecules.
Amino acids with polar or charged side chains are the ones that have the capability of creating hydrogen bonds with water molecules. These amino acids are the only ones that can make hydrogen bonds with water. Serine, threonine, asparagine, glutamine, tyrosine, cysteine, methionine, histidine, lysine, arginine, and aspartic acid (aspartate) and glutamic acid are some of the amino acids that fall into this category (glutamate).
These amino acids have the ability to form hydrogen bonds with water molecules, which contributes to the general soluble nature of proteins as well as their structural integrity.
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why does the atomic radius decrease going from left to right across a period?
Atomic radius decrease going from left to right across a period because atomic number of element increases, atomic number and atomic radius are inversely proportional to each other.
The atomic radius of a chemical element is a proportion of the size of its particle, normally the mean or common separation from the focal point of the core to the furthest segregated electron
Atomic radius decreases across a period since valence electrons are being added to a similar energy level simultaneously the core is expanding in protons. The expansion in atomic charge draws in the electrons all the more unequivocally, pulling them nearer to the core.
The atomic radius continues decreasing while at the same time going from left to right in a period on the grounds that the atomic(nuclear) number of the element increments which implies the quantity of protons and electrons in the molecules expands (the additional electrons being added to a similar shell).
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