A connection needs more attractive forces than repellent ones in order to be stable.
The electrostatic pull that holds the atoms together to create compounds is the basis of chemical bonds. Stronger bonds and more stable compounds result from stronger electrostatic attraction. The bond will require more energy to be broken because of the electrostatic attraction, making it more stable. The bond will be less stable if the repulsive forces are too strong since they will make the link weaker and need less energy to break. A durable link between atoms requires that the attractive forces outweigh the repulsive forces.
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how many of the following molecules possess dipole moments? bh3, ch4, pcl5, h2o, hf, h2
BH3,CH4,PCl5,and H2 have zero dipole moment whereas the H2O and HF have permanent dipole moment.
what is dipole moment?
The bond dipole moment is the moments but property of the chemical bond that is used to measure the polarity of the bond within a molecule.
BH3 a non-polar molecule owing to its symmetric structure.
CH4 forms a regular tetrahedral structure and has very small electronegativity difference between the atoms that cancels out each other due to their directional vectors. Thus CH4 is non polar.
PCl5 is made up of polar P−Cl bonds that form a trigonal bipyramidal molecular which is arranged symmetrically thus the PCl5 molecule is nonpolar.
H2O is a polar compound with a bent shape, which is the reason for the polarity of the compound.
HF is a polar molecule owing to higher electronegativity difference and no other bonds to cancel the polarity thus formed.
H2 is a diatomic molecule and hence it is non-polar.
Thus, the atoms that possess dipole moments are H2O,HF .
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what is the concentration, in m/v percent, of a solution prepared from 50. g nacl and 2.5 l of water?
The concentration, in m/v percent, of a solution prepared from 50. g nacl and 2.5 l of water is 2 %.
The mass/volume percent is the ratio of a solution's total volume to the mass of the solute that makes up that solution. Since this type of concentration has been expressed as a percentage, the given proportion should be multiplied by 100.
The calculation if concentration is shown as:
It can be calculate as follows:
% NaCl = Mass of NaCl / Total mass × 100 %
% NaCl = 50 gram / 2500 × 100 %
% NaCl = 2 %.
As a result, the solution made from 50 g of nacl and 2.5 l of water will have a 2% concentration.
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2. In the equilibrium between carbonic acid, bicarbonate, and carbonate which
molecule(s) are favored at low pH?
There would be more of the bicarbonate ion present in the solution at low pH.
What specie is favored at low pH?We know that the pH has to do with the degree of the acidity of the alkalinity of a given solution. We know that carbonic acid can be able to dissociate in solution via a reversible reaction.
In this case, when the pH is low, we know that there would now be more of the bicarbonate ion as the acid would begin to dissociate so as to counter the constraint of the pH that has been imposed on the system.
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8) the above molecule is composed of/contains ? a) riboflavin b) deoxyribose c) phosphodiester bonds d) a and c only e) a and b only
The correct option is e)t a and b only. Riboflavin and deoxyribose are both components of the molecule, while phosphodiester bonds link the two together.
What is molecule?Molecule is a group of two or more atoms held together by covalent bonds. The atoms that make up a molecule can be from the same element, such as two hydrogen atoms, or from different elements, such as a hydrogen atom and an oxygen atom. Molecules can be as small as two atoms or as large as thousands of atoms. The properties of a molecule depend on how the atoms are arranged and the type of bonds that are formed.
Riboflavin is a B vitamin found in foods such as milk, eggs, and green vegetables, while deoxyribose is a five-carbon sugar that forms the backbone of DNA. Phosphodiester bonds are covalent chemical bonds which link the two components of the molecule together.
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an aqueous solution at has a h30 concentration of . calculate the concentration. be sure your answer has the correct number of significant digits
H3O+ is present in aqueous solutions with a concentration of 8.8 1012 M at 25 °C. Determine the amount of OH present. Please include significant digits in your response. OH ([OH]) concentration: Take water's ability to ionize itself as an example. 2 H2O(aq), H3O+(aq), and OH (aq)
Kw = [H3O+] [OH] = 1.0 1014 [OH] = 1.0 1014 / [H3O+][OH] = 1.0 1014 / 8.8 1012 [OH] = 1.1 103 M is the equilibrium constant for this reaction.
How much H3O+ is present in water?In pure water, there are 10-6mol dm-3 H3O + ions present.
How is the pH of a solution determined using H3O?The hydronium ion concentration in moles per liter must be known in order to compute the pH of an aqueous solution (molarity). After that, the pH is determined using the formula pH = - log [H3O+].
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Which among the chemicals is NOT an approved sanitizer for kitchen tools
D. Steam
and equipment?
A. Chlorine B. Iodine C. Quaternary ammonium D. Timsen
a paricular vitamin's chemical formula has one colat atom. what is the molar mass of the vitamin if it conatain 4.34% cobalt
You can use the molecular mass of Co with its percentage composition to discover the molar mass of cyanocobalamin is 59.903g.
Atomic mass Co = 58.901 amuPercent cobalt with the aid of using mass = 4.34%To discover the molar mass of 1 percentage of the molecule, divide the atomic mass of Co with the aid of using its percentage of general composition.1 percentage of cyancobalmin = 58.901 amu / 4.34% = 13.5715 amuSo now multiply this with the aid of using 100%1357.15 amuThe molar mass of cyanocobalmin is 1357.15 g/molCheck 4.34 percentage of 1357.15 is 59.903 .Read more about atom:
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methanol (ch3oh) can be made by the controlled oxidation of methane: ch4(g)+12o2(g)→ch3oh(g)
The standard Gibbs free energy change for the reaction at 25°C is approximately - 111.158 KJ/mol.
To calculate the standard Gibbs free energy (ΔG°) at 25°C for the reaction CH4(g) + 1/2 O2(g) → CH3OH(g), we can use the formula:
ΔG° = ΔH° - TΔS°
where ΔH° is the standard enthalpy change for the reaction, T is the temperature in kelvin, and ΔS° is the standard entropy change for the reaction.
Assigning the respective values given in the question, we have:
ΔG° = (-126.4 kJ/mol) - (298 K)(-51.1 J/mol*K)
= -126.4 kJ/mol - (-15.2418 KJ/mol)
= - 111.158 KJ/mol
Therefore, the standard Gibbs free energy change for the reaction at 25°C is approximately - 111.158 KJ/mol. This value tells us that the reaction is thermodynamically favorable and will tend to occur spontaneously under standard conditions.
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Complete question:
Methanol, CH3OH, can be made by oxidation of methane in limited quantity.
CH4(g) + 1/2 O2(g) CH3OH(g)
ΔH = -126.4
ΔS = -51.1
Calculate ΔG° at 25°C.
what is one possible problem from regenerating a greensand bed by adding a higher dosage of potassium permanganate?
The chemical element KMnO4 is the same as potassium permanganate. Manganese is in the +7 oxidation state in this salt. The salt is also referred to as "potash permanganate." The ion of permanganate is a potent oxidizer.
Another popular technique for treating water to remove sulfur is manganese greensand. It is often advised for water with less hydrogen sulfide than 6.0 mg/l. A unique coating on a manganese greensand filter causes hydrogen sulfide gas to oxidize into solid sulfur particles, which are then filtered. Potassium permanganate is used to rejuvenate the greensand after all of the manganese oxide has been used up. Potassium permanganate is a purple oxidizing chemical that is added to the untreated water to maintain the manganese greensand filter.
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the combustion of g benzoic acid increases the temperature of a bomb calorimeter by . calculate the heat capacity of this calorimeter.
With this method, a sample is burned in a bomb calorimeter at a constant volume. Equation q = -CT, where C is the calorimeter's heat capacity and T is the temperature change, can be used to determine how much heat is released during the reaction.
If 1.000 g of benzoic acid burns in a bomb calorimeter to produce 26.38 kJ of heat, 0.550 g of benzoic acid will produce the following amount of heat:Conventionally, heat release is denoted by a negative sign.The sum of the heat emitted by combustion (Qc) and the heat absorbed by the bomb calorimeter (Qb) equals zero, according to the Law of Conservation of Energy.
The temperature of the bomb calorimeter rose from 22.01 °C to 24.27 °C after absorbing 14.5 kJ. Using the following expression, we can determine the calorimeter's (C) heat capacity.
In a bomb calorimeter, the combustion of 0.550 g of benzoic acid raises the temperature from 22.01 °C to 24.27 °C.
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which of the following geometries for the complex ion [co(en)(h2o)4]2+ are possible?
Octahedral type of molecular geometries are possible for the complex ion [Co(en)(H2O)4]2+.
In chemistry, an octahedral molecular geometry (also called a square bipyramid) is a compound with six atoms or groups of atoms or ligands arranged symmetrically around a central atom and defining the vertices of the octahedron represents the shape of The octahedron has eight faces, so the prefix is okta. The octahedral shape is characterized by Octahedral bond angle values of 90° and 180° define the octahedral shape. The angles between the four atoms forming the square bases of the two pyramids of the octahedral structure are 90°, as is the angle between each of these atoms and one of the apex atoms.
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Complete question :
Which of the following geometries for the complex ion [Co(en)(H2O)4]2+ are possible?
Check all that apply
trigonal bipyramidal or square pyramidal
octahedral
linear
tetrahedral or square planar
trigonal planar
What volume will 3.21 moles of oxygen gas occupy at stp
Answer:
71.9 L
Explanation:
PV = nRT
STP means 273K and 1.00 atm
(1.00 atm)(V) = (3.21 mol)(0.08206 L*atm/mol*K)(273K)
V = 71.9 L
given a concentrated solution of 50x concentration tae buffer, what volume (in ml) of this concentrated solution would we dilute to have 500ml of 1x tae buffer solution?'
We would dilute 10mL of this concentrated solution to make 500ml of a 1x TAE buffer solution.
Dilution is one of the easiest ways to make buffers. This is only applicable, though, if the working solution, which is the desired solution, has the same pH as the stock solution, which is the readily available, more concentrated solution. The dilution equation is employed in the preparation of buffer by dilution:
[tex]C_{1} V_{1} = C_{2} V_{2}[/tex]
where V refers to volume and C represents concentration. The subscripts 1 and 2 often denote the working solution and stock, respectively. Notably, both sides of the equation must always use the same units for concentration and volume.
From a stock of 50X TAE buffer, make 500mL of 1.0X TAE buffer as follows:
[tex]C_{1} V_{1} = C_{2} V_{2}[/tex]
(50X)V1=(1.0X)(500mL)
∴V1=10mL of 50X TAE Buffer
Calculating the volume of the water-based solvent is also necessary to finish the preparation. The remaining amount of water is needed to make the appropriate amount of working solution, which is 500mL.
[tex]V_{water}[/tex]=500mL−10mL=490mL
As a result, 490mL of water is used to dilute 10mL of 50X TAE Buffer.
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each drug has chemical and physical properties that must be considered when developing the pharmaceutical formulation, these include:
That the breakdown or dissolution of the drug after administration constitutes the pharmaceutic phase of drug activity, which must occur in medicine composition.
Describe healthcare.
Healthcare can be simply defined as organised medical care provided to an individual, group, or even community by a physician, nurse, or other qualified healthcare practitioner.
However, medically related Patients may contract infections from bacteria, viruses, fungi, and other pathogens while receiving therapy for another ailment.
For this reason, the primary goal of healthcare is to improve quality of life and healthy living through the provision of high-quality healthcare services.
As a result, the nurse is aware that the pharmaceutic phase of drug action, which must occur after administration of the medication, is the drug's breakdown or dissolution.
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write a chemical equation for formation of a polymer via a condensation reaction from the monomers succinic acid (hoocch2ch2cooh) and ethylenediamine (h2nch2ch2nh2).
HOOCCH2CH2COOH + H2NCH2CH2NH2 ----> Polymer + H2O is the chemical equation for formation of a polymer via a condensation reaction from the monomers succinic acid (hoocch2ch2cooh) and ethylenediamine (h2nch2ch2nh2).
A condensation reaction is a chemical reaction in which two smaller molecules combine to form a larger molecule, releasing a small molecule such as water or methanol as a byproduct. Condensation reactions are often used to synthesize polymer, which are large molecules made up of repeating units called monomers.
To write a chemical equation for the formation of a polymer via a condensation reaction from the monomers succinic acid and ethylenediamine, we can start by representing the monomers as follows:
Succinic acid: HOOCCH2CH2COOH
Ethylenediamine: H2NCH2CH2NH2
In a condensation reaction, the monomers combine through a dehydration synthesis reaction, in which a molecule of water is released as a byproduct. The resulting polymer consists of repeating units of the monomers linked by a covalent bond.
The general chemical equation for a condensation reaction between two monomers can be written as follows:
Monomer 1 + Monomer 2 --> Polymer + byproduct
In this case, the polymer produced by the condensation reaction between succinic acid and ethylenediamine would be a polyamine with repeating units of the monomers linked by a covalent bond. The chemical equation for the formation of this polymer via a condensation reaction would be:
HOOCCH2CH2COOH + H2NCH2CH2NH2 -> Polymer + H2O
It is important to note that the actual structure of the polymer produced in this reaction will depend on the specific conditions of the reaction and the specific monomers involved. The chemical equation provided is a general representation of a condensation reaction between these monomers and does not represent the exact structure of the polymer that would be produced.
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which of the following is not a ligand to the porphyrin ring fe(ii) ion in oxymyoglobin?
His E7 isn't a ligand for the porphyrin ring (Fe(II)) ion in oxymyoglobin.
In the porphyrin ring, four pyrrole nitrogens are bound to the a ferrous (Fe(II)) ion centre. The Fe(II) ion does have six coordination sites, four of which are inhabited by pyrrole nitrogen, one by proximal histidine, and the final site can form a reversible bond with an O2 molecule.
A porphyrin is a large ring molecule composed of four pyrroles, which are smaller rings with four carbons and one nitrogen. A series of single and double bonds connect these pyrrole molecules, causing the formation of a large ring. The technical term for four pyrroles linked together is tetrapyrrole. The ring is flat in space and has a fairly even electron distribution around in its circumference.
A porphyrin is thus categorized as an aromatic compound. This demonstrates how stable a porphyrin molecule is. Porphin is the general porphyrin model. This molecule appears as just an intermediate in nature only on rare occasions, but it serves as the foundation for all porphyrin molecules.
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copper (63.546 amu) has two isotopes: 63 cu (62.9396 amu) and 65 cu (64.9278 amu). what percent of copper atoms are 65 cu?
Isotopes are two or more atom types that share the same atomic number (number of protons in their nuclei), location in the periodic table, and chemical element. Still, they have different nucleon numbers (mass numbers) as a result of having a different number of neutrons in their nuclei. Although the chemical properties of each isotope of a given element are nearly identical, they differ in their atomic weights and physical characteristics.
Along with 27 radioisotopes, copper (29Cu) has two stable isotopes: 63Cu and 65Cu. The radioisotope 67Cu, with a half-life of 61.83 hours, is the most durable; 54Cu, with a half-life of roughly 75 ns, is the least stable. A minute or less is the average half-life.
The percentage of copper atoms in 65 Cu is 25%.
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Which one of the following conditions would always result in an increase in the internal energy of a system? A) The system loses heat and does work on the surroundings. B) The system gains heat and does work or the surroundings. C) The system loses heat and has work done on it by the surroundings. D) The system gains heat and has work done on it by the surroundings. E) None of the above is correct
The system gains heat and has work done on it by the surrounding, this condition would always result in an increase in the internal energy of a system. thus the option D is correct.
When a system is heated or has work done on it by its environment, the internal energy of the system is constantly raised. Energy is an immaterial substance that is concerned with performing work on an item. One of the fundamental conservation rules that holds true throughout the cosmos is the conservation of energy. A type of energy is internal energy. The total kinetic energy of each gas molecule can be considered to be the internal energy U of our system. In other words, when the gas's temperature T rises, its molecules move more quickly and its internal energy U rises.
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in the laboratory you are asked to make a 0.643 m nickel(ii) iodide solution using 355 grams of water. how many grams of nickel(ii) iodide should you add
The amount of nickel(ii) iodide that should be added for making the solution is 71.3 kilograms.
As the molality and weight of water is given, we will use the formula of molality to find the mass of nickel(ii) iodide.
Molality = number of moles of nickel(ii) iodide/weight of solvent in kilograms
Number of moles = mass/molar mass
Molar mass = 312.5 grams
Keep the values -
0.643 = moles/355
Moles = 228.3
Mass = 228.3 × 312.5
Performing multiplication on Right Hand Side of the equation
Mass = 71,332.8 grams
Mass = 71.3 kilograms
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Lithium ha two iotope with ma number 6 and 7. If the relative atomic ma of
lithium i 6. 94, determine the percentage abundance of each iotope
The percentage abundance of lithium 6 is 6% and percentage abundance of lithium 7 is 94%.
Relative atomic mass is defined as the ratio of the average mass of atoms of a chemical element in a given sample to the atomic mass constant. The atomic mass constant is defined as being 1/12 of the mass of a carbon-12 atom.
R.A.M = (Mass.no ×Abundance) / (Total abundance)
Let the abundance of Li-6 be x
Relative abundance of Li-7 will be 100−x.
6.94 = (6 × x)+ 7(100−x) / 100
6x + 700 – 7x = 694
X = 6%
Li-6 has 6%, Li-7 has 94% because the sum of the percent natural abundances of all the isotopes of any given element must total 100%. atoms that have the same atomic number (number of protons), but different mass numbers that is number of protons and neutrons are called isotopes.
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Kinetic energy___ the speed and/or the masse of a raised object
Kinetic energy directly proportional to the speed and/or the masses of a raised object.
What is kinetic energy?An item possesses kinetic energy when it is in motion. Applying force is necessary if we wish to accelerate an item. We must put forth effort in order to apply a force. Once the job is finished, energy is transferred to the item, which then moves at a new, constant speed.
The amount of kinetic energy that is transmitted is determined by the mass and speed attained. The relationship between kinetic energy and an object's mass and squared velocity is given by K.E. = 1/2 mv².
Thus, Kinetic energy directly proportional to the speed and/or the masses of a raised object.
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it takes 16.6 min for a 10.0 ml sample of an unknown as to effuse through a pinhole. a 10.0 ml sample of helium, he, required 5.00 min. what is the molecular weight of the unknown gas?
176.36g is the molecular weight of the unknown gas
At equal volumes, t2/t1= √M2 / √M1
Let the molecular mass of the unknown gas be x
16.6/5 = √x /4
√x = 16.4 × 4 / 5 = 13.28
x = 13.28*13.28
x = 176.36g
The entire mass of the atoms required to form a molecule per mole, expressed in grams, is what makes up the molar mass, also known as the molecular weight. Grams per mole are used to measure molar mass. The mass of 1 mole of a material, expressed in M grams, is its molecular weight, also known as its molar mass, abbreviated M. The mass of a given substance's molecules is its molecular weight. While molar mass and molecular weight have distinct definitions and measurement systems, their values are equivalent.
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a compound is a chemical substance with a given set of properties that cannot be broken down into substances with other properties. true false
What process is represented by this redox equation?
-
6H20 + 6CO2
C6H1206 +602
A. Cellular respiration
B. Rusting
C. Photosynthesis
D. Combustion
The process that is represented by this redox equation
6 H₂O + 6 CO₂ ---> C₆H₁₂O₆ + 6 O₂ is photosynthesis.
The correct option is C.
What is a redox reaction?A redox reaction is a reaction in which oxidation and reduction occur simultaneously at the same time and to the same extent.
In a redox reaction, electrons are transferred from one species to another.
The species that transferred electrons becomes oxidized whereas the species that accepts electrons becomes reduced.
Hence, a reduction reaction is a reaction in which a chemical species accepts electrons while an oxidation reaction is a reaction in which a chemical species donates electrons.
Considering the given reaction:
6 H₂O + 6 CO₂ ---> C₆H₁₂O₆ + 6 O₂
In the given reaction, carbon is reduced while oxygen is oxidized.
The reaction shows the process of photosynthesis where carbon dioxide is reduced to produce glucose.
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if the two different types of hydrogen atoms were equally reactive, what ratio of 1-chloropropane to 2-chloropropane would we expect as monochlorination products?
It is crucial to be able to extend out a line diagram to a condensed formula, therefore the first step in this process.
The next step is to begin sketching the various scenarios as we switch out one hydrogen on a propane cylinder for a chlorine atom. It should be obvious that there are only two options for chlorinating propane: C-1 or C-2 (chlorination at C-3 would give the same product as that at C-1).
Monochlorination means the addition of a chlorine atom. When chlorine atom is added to the below structure. Chlorine will substitute at one of the hydrogens.
Constitutional isomers of these two substances are 1-chloropropane and 2-chloropropane.
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how did the study of the atom contribute to our understanding of the periodic table of the elements?(1 point) responses
The study of the atom contribute to our understanding of the periodic table of the elements by providing information about the structure of the atom and the arrangement of the elements.
What does research into the atom show?This study reveals how the elements are arranged.
Atomic weight (number of protons).Atomic weight (number of protons and neutrons).electron arrangement.Understanding atoms let scientists learn more about the building blocks of elements, which helped organize the periodic table. Scientists were able to organize the periodic table using the atomic weights and atomic numbers obtained from experiments that revealed the properties of individual atoms. Which is a system of categorizing the elements based on their atomic qualities, by comprehending the structure of the atom and the arrangement of the components.
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a compound contains 27.04% sodium, 16.48% nitrogen and 56.52% oxygen what is the empirical formula of the compound?
NNaO3 is the empirical formula of the compound, a compound contains 27.04% sodium, 16.48% nitrogen and 56.52% oxygen
⇒Find molar mass of each component: N=14.0067, Na=22.98976928, O=15.9994
⇒Convert to moles: N=1.1765797796769, Na=1.1761753530743, O=3.5295073565259
⇒Find smallest mole value: 1.1761753530743
⇒Divide all components by the smallest value: N=1.0003438489011, Na=1, O=3.0008343120781
⇒Round to closest whole numbers: N=1, Na=1, O=3
⇒Combine to get the empirical formula: NNaO3,
The scientific name for nitrogen is N, and it is an element that has no colour nor smell. The ground beneath our feet, the water we drink, and the air we breathe all contain nitrogen. In reality, nitrogen makes up the majority of the atmosphere on Earth, making up around 78% of the atmosphere.
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how many moles of naoh are contained in 15.2l of a 0.205m naoh solution? multiple choice 125 moles naoh 0.0134 moles naoh 3.12 moles naoh 74.1 moles naoh 0.0779 moles naoh
3.12 moles NaOH are contained in 15.2l of a 0.205m NaOH solution
15.2 x 0.205 = 3.116 moles. By rearranging the equation, you must first determine how many moles are there in this solution. False. Molarity (M) x Volume (L) equals 15.2 x.205, or 3.12 moles.
Molarity (M), which is determined by dividing the solute's mass in moles by the volume of the NaOH solution in liters, is the most often used unit to represent NaOH solution concentration: liters of solution/moles of solute equals M. One liter of a NaOH solution with a 1.00 molar concentration (1.00 M) contains 1.00 moles of solute.
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consider two different isotopes of the same neutral element. which statements about these isotopes are true? (there may be more than one correct choice.)
The number of protons in each isotopes is the same. Because both isotopes have the same amount of orbital electrons, the claims made about them are accurate.
What does an element mean?An element is a basic thing that is difficult to divide into smaller parts. A material that cannot be broken down by non-nuclear processes is referred to as an element in chemistry and physics. An element is a unique component of a bigger system or set in computers and mathematics.
What makes anything an element?Any material that cannot be broken down into simpler compounds by regular chemical processes is a chemical element, often known as an element.
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What is the mass of a neutron in atomic mass units (amu)?
The mass of a neutron in atomic mass units is 1.008665 amu
Because neutrons are atomic particles, neutrons are a component of atoms. The English physicist James Chadwick discovered neutrons for the first time in 1932. He found the presence of a particle with no electric charge while conducting radioactivity studies, and he named it the neutron which typically has zero charge.
The atomic mass unit or AMU is a unit of mass used to express the masses of atoms and molecules. The mass of a neutron is almost the same as the mass of a proton whereas the electron is much less massive. In terms of AMU, the mass of a neutron in atomic mass units is 1.008665 amu
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