The three pKa values of aspartic acid exists 1.89, 3.65 and 9.60.
What is meant by amino acid aspartic acid?Due to the presence of two carboxyl groups in the molecule, aspartic acid has an isoelectric point of 2.77. Carboxyl groups attached to alpha carbon have a pKa value of 1.88, -COOH groups attached to side chains have a pKa value of 3.65, and amino groups have a pKa value of 9.60. The sum of pKa1 and pKa3 is divided in half to determine the isoelectric point.
Depending on their side chains, the proteinogenic amino acids are amphoteric and have two or three pK values. The -carboxyl group is represented by pKa1, the -ammonium ion is represented by pKa2, the side chain group, if any, is represented by pKa3, and the isoelectric point, at which the amino acid has no net charge, is represented by pI.
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What is the type of ClF3 molecule?
The type of the ClF₃ molecule is the covalent compound. The Chlorine Trifluoride will represents the trigonal bipyramidal geometry.
The Chlorine Trifluoride that is ClF₃ represents the trigonal bipyramidal geometry. In the chlorine trifluoride compound, there are the three bond pairs of the electrons and the two lone pairs of the electrons around the central atom that is the chlorine atom. The total of the five pairs of the electrons represent the trigonal bipyramidal geometry.
The covalent compound is formed by the mutual sharing of the electrons. The chlorine atom will forms the three covalent bonds with the surrounding fluorine atoms in the stable state.
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the following do not represent valid ground-state electron configurations for an atom either because they violate the pauli exclusion principle or because orbitals are not filled in order of increasing energy. indicate which of these two principles is violated in each example or whether both or neither are violated.
An atom's nucleus is surrounded by electrons and protons and neutrons, each with a unique energy level. The Pauli exclusion principle shows how to fill orbitals with electrons in the proper order.
What is Pauli's law of exclusion?Pauli's exclusion principle is a fundamental principle of quantum mechanics that states that no two fermions can occupy the same quantum state simultaneously. Fermions are a class of subatomic particles that include electrons, protons, and neutrons, and are distinguished by their half-integer spin.
The exclusion principle is named after the Austrian physicist Wolfgang Pauli, who formulated it in 1925. The principle is based on the wave nature of matter and the fact that fermions are described by wave functions that obey the Schrödinger equation.
Energy order of orbital
1s<2s<2p<3s<3p<4s<3d<4p<5s<4d<5p<6s<4f<5d
An atom's nucleus is its main structural component. It is surrounded by electrons and has protons and neutrons inside. These electrons all share the same mass and charge, though. An atom's electrons each have a unique energy level. The positively charged nucleus's strongest attractive force is felt by the electrons nearest to it, which have the lowest energy. Higher energy electrons are located farther away.
The Pauli exclusion principle demonstrates how to fill orbitals with electrons in the proper order.
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Compare the emissions of a propane burning car to that of a car burning regular gasoline. Which pumps out more pollution? For simplicity, assume gasoline to be 100% octane (2,2,4- trimethylpentane).
1. Write and balance a combustion formula for each type of engine. (Don't forget phase signs!) Fuel + O2 → CO2 + H₂O
The combustion reaction for propane can be represented as follows:
C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (l)
The combustion reaction for gasoline (2,2,4-trimethylpentane) can be represented as follows:
C8H18 (g) + 25/2 O2 (g) → 8CO2 (g) + 9H2O (l)
In general, both types of engines produce CO2 and H2O as products of combustion. However, gasoline releases more CO2 per unit of fuel burned compared to propane, due to its higher carbon content. So, a car burning gasoline would produce more emissions of CO2 compared to a car burning propane.
how to calculate percent error chemistry
All of this is summed up with the formula: Percentage Error is equal ((Estimated Number – Actual Number)/ Actual number) x 100.
Depending on how close to the true value a measurement is, it may be accurate or inaccurate. Imagine you are conducting an experiment to find out how dense a sample of aluminum metal is. The true or accurate value of a measurement is one that is based on widespread agreement with an authoritative reference.
The accepted density for aluminum is 2.70g/cm3. A measurement's experimental value is its value as it is observed during the experiment. Let's say your experiment yields the experimental result that the aluminum density is 2.42g/cm3. The discrepancy between experimental and accepted values is an experiment's error.
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Why is HF boiling point so high?
The gas and liquid hydrogen fluoride (HF) is extremely toxic and corrosive. Its surprising high boiling point is even higher than that of hydrogen iodide despite being the lightest of the hydrogen halides.
In the liquid phase, hydrogen and fluorine atoms form hydrogen bonds as a result of the fluorine atom's strong electronegativity. 1 The van der Waals forces connecting the other hydrogen halides are much weaker.
The molecule HF is commonly called hydrogen fluoride; but its Chemical Abstracts Service name, as found in SciFinder, is hydrofluoric acid. This usage also applies to the other hydrogen halides and has the potential for confusion with the terminology for aqueous solutions of the same compounds.
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does freezing involve the creation of a crystal structure
Yes, freezing involves the creation of a crystal structure. Freezing is the process of changing a liquid to a solid by cooling it below its freezing point.
During the freezing process, the molecules of the liquid slow down and begin to arrange themselves in a repeating pattern, forming a crystal structure. The crystal structure that forms during freezing is determined by the chemical composition of the substance, its temperature, and the rate at which it is cooled.
If a liquid is cooled slowly, larger and more well-defined crystals will form, whereas if a liquid is cooled quickly, smaller and less well-defined crystals will form. The crystal structure created during freezing can have a significant impact on the physical properties of the solid, such as its strength, transparency, and melting point.
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Is methanol polar liquid?
Yes, methanol is a polar liquid.
Methanol is a simple alcohol consisting of a single carbon atom, three hydrogen atoms, and one hydroxyl group (-OH). The oxygen atom in the hydroxyl group is highly electronegative, meaning it attracts electrons towards itself. As a result, there is an uneven distribution of electron density in the molecule, with the oxygen end being slightly negative and the carbon end being slightly positive.
This polarity makes methanol a polar solvent, meaning it has the ability to dissolve polar substances. Polar substances, such as salts and sugars, are typically composed of atoms with high electronegativity differences, and they are attracted to the polar regions of methanol molecules.
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A solution is prepared by dissolving 23.7 g of CaCl 2 in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of Cl- in this solution is ________ M.
Also, The concentration of HCl in a solution that is prepared by dissolving 5.5 g of HCl in 200 g of C2H6O is ________ molal.
The concentration of HCl in the solution is 0.651 mol/kg.
To find the concentration of Cl- ions in the CaCl2 solution, we can first calculate the number of moles of CaCl2 that were dissolved:
23.7 g of CaCl2 / 110.98 g/mol
=> 0.214 moles of CaCl2
Next, we can use the number of moles to find the number of moles of Cl- ions:
0.214 moles of CaCl2 × 2 moles of Cl- ions/mole of CaCl2
= 0.428 moles of Cl- ions
Finally, we can use the volume of the solution to find the concentration in moles per liter (M):
Volume = 375 g of water ÷ 1.05 g/mL
=> 357.14 mL
=> 0.35714 L
Concentration = 0.428 moles of Cl- ions ÷ 0.35714 L
=> 1.20 M
So, the concentration of Cl- ions in the CaCl2 solution is 1.20 M.
Next, to find the concentration of HCl in molality, we can first calculate the number of moles of HCl that were dissolved:
5.5 g of HCl ÷ 36.46 g/mol
=> 0.151 moles of HCl
Next, we can use the number of moles of HCl and the mass of the solvent (C2H6O) to find the molality:
Molality = 0.151 moles of HCl / (200 g of C2H6O ÷ 46.07 g/mol)
=> 0.651 mol/kg
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What size filter paper should be used with a hirsch funnel?
The size of filter paper you should use with a Hirsch funnel depends on the size of the funnel. if you have a Hirsch funnel with a diameter of 7cm, you might choose filter paper with a diameter of 9cm.
To determine the appropriate filter paper size, you should select a filter paper that is slightly larger in diameter than the widest part of the Hirsch funnel. This allows the filter paper to fit snugly in the funnel and helps to prevent it from folding or collapsing during the filtration process.
For example, if you have a Hirsch funnel with a diameter of 7 centimeters, you might choose filter paper with a diameter of 9 centimeters. This will provide enough excess filter paper to fold over the edges of the funnel and ensure a tight fit.
It's also important to choose the appropriate grade of filter paper based on the nature of the material being filtered and the desired filtration rate. You can consult the manufacturer's instructions or a laboratory handbook for guidance on selecting the appropriate grade of filter paper.
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what is diels alder reactions?
Answer:
The reaction between a conjugated diene and an alkene
Explanation:
The Diels–Alder reaction is the reaction between a conjugated diene and an alkene (dienophile) to form unsaturated six-membered rings. Since the reaction involves the formation of a cyclic product via a cyclic transition state, it is also referred to as a "cycloaddition".
Benzoic acid has limited solubility in water, but its conjugate base is completely soluble in water. Draw the structure of the product formed when benzoic acid is treated with aqueous sodium hydroxide? Click in the checkered box to open the structure drawing tool box.
When benzoic acid is treated with aqueous sodium hydroxide, it undergoes a neutralization reaction to form sodium benzoate, water, and hydrogen gas.
The balanced chemical equation for the reaction is: C6H5COOH + NaOH → C6H5COO-Na+ + H2O
In this reaction, the sodium hydroxide reacts with the benzoic acid to form sodium benzoate (the conjugate base of benzoic acid) and water.
The hydrogen gas is formed as a byproduct of the neutralization reaction. Sodium benzoate is completely soluble in water, while benzoic acid has limited solubility in water.
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In a chemical change, the substances that make up matter change into other substances with ______ physical properties and chemical properties.
In a chemical change, the substances that make up matter change into other substances with physical properties and chemical properties.
What is chemical change?Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. Some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. Understanding chemical changes is a major part of the science of chemistry.
When chemical reactions occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated. An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen. So much energy is released that the hydrogen gas released spontaneously burns in the air. This is an example of a chemical change because the end products are chemically different from the substances before the chemical reaction.
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Calculate the pressure, in atmospheres, exerted by 2.50 L HF containing 1.35 mol at
320.0 K.
The pressure exerted by a gas can be calculated using the ideal gas law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is the temperature in kelvins.
Plugging in the given values, we get:
P = (nRT) / V
P = (1.35 mol * 8.31 J/mol*K * 320.0 K) / (2.50 L * 10^-3 m^3)
P = (4460.8 J) / (0.0025 m^3)
P = 17843.2 Pa
To convert from pascals to atmospheres, we divide by 101325 Pa/atm:
P = 17843.2 Pa / 101325 Pa/atm
P = 0.176 atm
So, the pressure exerted by 2.50 L of HF containing 1.35 mol at 320.0 K is approximately 0.176 atm.
when combining a strong acid with water to dilute it, you should add the acid to the water.
The given statement "when combining a strong acid with water to dilute it, you should add the acid to the water" is true because when diluting a strong acid, it is generally recommended to add the acid to the water, rather than the other way around; therefore the given statement is true.
This is because the process of mixing a strong acid with water can generate a significant amount of heat, and adding water to the acid can result in a rapid release of this heat, potentially causing the solution to boil or splatter. On the other hand, adding the acid slowly to the water allows for better heat dissipation, reducing the risk of splattering or boiling. Therefore, the general rule of thumb is to "add acid to water", which helps ensure safe and controlled mixing.
"
when combining a strong acid with water to dilute it, you should add the acid to the water.
True
False
"
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How many moles of H2O are needed to react with 7 moles Mg(OH)2 with excess Mg3N2?
answer asap plssss
In the presence of extra Mg3N2, a reaction involving 7 moles of Mg(OH)2 requires 14 moles of water.
One mole—what is it?A mole is the volume of a substance that contains 6.022 X 1023 of the substance's particles, atoms, ions, molecules, etc. A mole is a unit for counting molecules, ions, or atoms.
The reaction between Mg(OH)2 and H2O has the following balanced chemical equation:
Mg(OH)2 + 2H2O → Mg(OH)2·2H2O
This indicates that 2 moles of water react with 1 mole of Mg(OH)2.
We may determine how many moles of water are required by using the following formula since we have 7 moles of Mg(OH)2.
7 moles Mg(OH)2 × (2 moles H2O / 1 mole Mg(OH)2) = 14 moles H2O.
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why is it important to drop a ball from the same height three times why were the numbers slightly different
Answer:
It is important to drop a ball from the same height multiple times to test and validate a theory or hypothesis. By doing this, one can observe and measure the consistency of the results and determine the average or most common outcome. The numbers may be slightly different due to small variations in the experiment such as air resistance, the angle at which the ball was dropped, or variations in the measurement tools used to record the data. By doing multiple trials and calculating an average, the effects of these variations can be minimized and a more accurate result can be obtained.
Explanation:
Dropping a ball from the same height three times is important in an experiment to calculate the average or mean value of the times it takes the ball to fall from the height to the ground. By repeating the experiment multiple times, we can minimize the effect of random errors and get a more accurate result.
However, even when dropping the ball from the same height three times, the recorded times may be slightly different due to several reasons. Some of these reasons could be variations in the initial release height of the ball, differences in the air resistance experienced by the ball during its fall, and slight variations in the reaction time of the person measuring the time. These variations can result in slightly different measured times, which can be accounted for by calculating the average value.
select the appropriate pipette to use for each of the following volumes:
A.) 874 uL
B.) 57 uL
C.) 340 uL
D.) 15 uL
A: 1000 µL micropipette, B: 100 µL micropipette, C: 1000 µL micropipette or 1 mL graduated pipette and D: 20 µL micropipette or 25 µL micropipette.
A) 874 µL: An appropriate pipette to use for 874 µL could be a P1000 pipette, which has a volume range of 100 µL to 1000 µL.
B) 57 µL: An appropriate pipette to use for 57 µL could be a P200 or P20 pipette. The P200 has a volume range of 20 µL to 200 µL, while the P20 has a volume range of 2 µL to 20 µL.
C) 340 µL: An appropriate pipette to use for 340 µL could be a P1000 or P200 pipette.
D) 15 µL: An appropriate pipette to use for 15 µL could be a P20 pipette, which has a volume range of 2 µL to 20 µL.
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Design an experiment to show that the chemical changes occurring as a log burns in a fireplace are governed by the law of conservation of mass.
The experiment to show that the chemical changes occurring as a log burns in a fireplace are governed by the law of conservation of mass can be performed by weighing the log before and after burning and measuring the amount of ash and gases produced.
The experiment can be carried out by obtaining a dry log of known mass, placing it on a scale, and recording its weight. The log is then burned in a fireplace, and once the fire has been extinguished, the remaining ashes are collected and weighed. Additionally, the volume of gases produced during combustion can be measured using a gas displacement apparatus.
The initial mass of the log should be equal to the final mass of the ash and gases produced, providing evidence for the law of conservation of mass in chemical reactions. The experiment can be repeated with different types of logs to demonstrate that the law of conservation of mass applies to all types of combustion reactions.
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How many ions would you expect MgBr2 to break down into in water? a) 2 b) 3 c) 1 d) 4
MgBr2 will break down as 3 ions into in water
Describe an ion.
A charged atom or molecule is known as an ion. Because there are more electrons than protons in the atom or molecule, it is charged. Depending on whether the number of electrons in an atom is greater or less than the number of protons in the atom, an atom can develop a positive charge or a negative charge.
The ionic compound known as magnesium bromide is created when the metal magnesium and the non-metal bromine are combined. Each molecule of MgBr2 contains three ions (1x Mg2 and 2x Br-).
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what is the type of polyester that gets formed in the reaction between ethylene glycol and phthalic anhydride?
The polyester that gets formed in the reaction between ethylene glycol and phthalic anhydride is Glyptal.
Poly(ethylene terephthalate), additionally referred to as PET, is the main polyester. It is a copolymer of ethylene glycol and terephthalic acid. PET and all different polyesters are produced industrially with the aid of using transesterification reactions. PET is ready with the aid of using the response of dimethyl terephthalate with ethylene glycol at 150 °C. Glyptal is a polyester, is shaped with the aid of using ethylene glycol and phthalic acid shaped with the aid of using step-boom polymerization as proven withinside the above response. As it warms, the phthalic anhydride will start to soften and dissolve withinside the ethylene glycol. You may also note that because it does so, the answer seems to boil; the water produced with the aid of using the response is boiling away.
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How many mmols of hbr are in 17.6 ml of 0.0200m hbr?
The number of mmols of HBr are in 17.6 ml of 0.0200 M HBr is 0.352 mmol.
The volume of the solution = 17.6 mL = 0.0176 L
The molarity of the solution = 0.0200 M
The expression for the molarity of the solution is as :
The molarity = moles / volume in L
The number of the moles = molarity × volume
The number of moles = 0.0200 × 0.0176
The number of the moles = 0.000352 mol
The number of the moles in mmoles = 0.352 mmol
Thus, the number of moles of HBr is 0.352 mmoles in the 17.6 ml of the 0.0200 M.
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What is the difference between a natural and a synthetic substance?
Answer:
natural and synthetic substances
Explanation:
natural substances are naturally occurring substances without human interference.
synthetic substances are the man made substances which are made from the natural substances.
Hope it helps..
What is the molecularity of each of the following elementary reactions? Write the rate law for each.
(a) Cl2(g) → 2 Cl(g)
(b) OCl–(aq) + H2O(l) → HOCl(aq) + OH–(aq)
(c) NO(g) + Cl2(g) → NOCl2(g)
The molecularity of an elementary reaction is equal to the sum of the stoichiometric coefficients of the reactants.
The molecularity of an elementary reaction is the number of molecules or atoms involved in the reaction. It is equal to the sum of the stoichiometric coefficients of the reactants.
(a) The elementary reaction Cl2(g) → 2 Cl(g) is a unimolecular reaction, as only one molecule is involved. The rate law for this reaction can be written as:
rate = k[Cl2]
(b) The elementary reaction OCl–(aq) + H2O(l) → HOCl(aq) + OH–(aq) is a bimolecular reaction, as two molecules are involved. The rate law for this reaction can be written as:
rate = k[OCl–][H2O]
(c) The elementary reaction NO(g) + Cl2(g) → NOCl2(g) is a bimolecular reaction, as two molecules are involved. The rate law for this reaction can be written as:
rate = k[NO][Cl2]
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How do you convert moles to mass?
The molecular weight is the number of grams per mole for the substance and the conversion factor for moles to grams for that specific substance.
Molecules are made up of different atoms. For example, a water molecule (H₂O) is composed of one oxygen atom and two hydrogen atoms. Molecular weight (or molecular weight) is the sum of the atomic masses of all atoms present in a molecule. Moles is the amount in grams of a substance numerically equal to molecular weight. According to Avogadro's number, the number of molecules of a substance in one mole is 6.02 × 10²³ molecules. If we know the molecular weight of a substance and number of moles, then we can calculate the weight of substance, using the formula: molecular weight × number of moles
= mass of the substance in grams. Therefore, the mass of 1 mole of water is 18.02 g (1 mole of H₂O x 18.02 g/mol = 18.02 g).Hence, we got the relationship between moles and mass of substance.
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according to the kinetic-molecular theory, particles in solids
According to the kinetic-molecular theory, particles in solids are in constant motion.
Explain kinetic-molecular theory?
The kinetic-molecular theory is a theory that explains the properties of gases in terms of the motion and interactions of molecules. This theory states that all gases are composed of tiny particles that are in constant motion and that these particles collide with each other and with the walls of their container. The collisions between the molecules cause the gas particles to move in random directions, and the motion of these particles is what is responsible for the pressure of the gas. The kinetic-molecular theory also states that the average kinetic energy of the individual gas molecules is proportional to the temperature of the gas.
In the kinetic-molecular theory, particles in solids have fixed positions and are unable to move or vibrate, which help to explain the properties of solids such as their rigidity and strength.
Therefore, particles in solids are in constant motion.
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The air pressure in a tank is measured using an inclined manometer whose arm is inclined 45 degree from the horizontal line. the densities of the air and water are 1.225 kg/m3 and 1000 kg/m^3, respectively. Determine the gauge pressure of air in the tank.
The gauge pressure of the air in the tank is 101325 Pa - 9.439*L when The air pressure in a tank is measured using an inclined manometer whose arm is inclined 45 degree.
Let's call the length of the inclined arm of the manometer L. Then, the vertical component of the arm length is given by
[tex]L sin(45) = L/\sqrt2[/tex]
Next, we can use the hydrostatic pressure equation to relate the pressure difference between the two arms of the manometer to the difference in height:
ΔP = ρgh
Where ΔP is the pressure difference, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the difference in height between the two arms of the manometer.
Since the two arms of the manometer are open to the atmosphere, the pressure at the top of the manometer is equal to the atmospheric pressure, which we can assume to be 101325 Pa. Therefore, the gauge pressure of the air in the tank is equal to:
[tex]P_{gauge} = P_{atm} - \triangle P[/tex]
where [tex]P_{atm[/tex] is the atmospheric pressure.
Putting it all together, we get:
ΔP = (ρwater - ρair)gh
[tex]= (1000 kg/m^3 - 1.225 kg/m^3) * 9.81 m/s^2 * (L/\sqrt2)[/tex]
= 9.439 * L
Therefore, the gauge pressure of the air in the tank is:
Pgauge = Patm - ΔP
= 101325 Pa - 9.439 * L
Note that the pressure will be in Pa, and you can convert it to other units like psi or bar as necessary.
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QuestionThe smallest part of an element that retains the chemical properties of the element.AelectronBmoleculeCatomDproton
The smallest component of an element that maintains its identity during a chemical reaction is known as the atom.
What is the smallest part of an element that retains its identity in a chemical reaction?The smallest piece of matter with all of an element's chemical properties is an atom. The tiniest part of an element, an atom nonetheless possesses all of the element's chemical characteristics. is a positively charged particle that moves around the nucleus.
The smallest elemental particle that can retain all of an element's chemical characteristics is an atom. It is the indivisible unit of matter that is capable of existing alone. It is a substance that makes up matter. The smallest component of an element that maintains its identity during a chemical reaction is known as the atom.
The smallest component of an element, an atom has exactly the same chemical makeup as the element as a whole. Dalton's Atomic Theory, which states that all matter is made up of indivisible, indestructible atoms, was the first reliable theory describing the nature of matter.
Therefore, the correct answer is option C) atom.
The complete question is;
The smallest part of an element that retains the chemical properties of the element.
A) electron
B) molecule
C) atom
D) proton
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What is the chemical p2?
The chemical P2 refers to the diphosphorus molecule, which is a compound made up of two phosphorus atoms bonded together.
Diphosphorus, also known as P2, is a chemical compound composed of two phosphorus atoms covalently bonded together. It is a highly reactive and unstable molecule that is rarely encountered in its pure form. Diphosphorus is an allotrope of phosphorus, meaning it is a different structural form of the same element.
At room temperature, diphosphorus exists as a colorless, odorless gas with a molecular weight of 60.98 g/mol. It is highly reactive and can easily ignite when exposed to air, making it a fire and explosion hazard. Diphosphorus is also highly toxic and can cause severe burns and respiratory problems if inhaled.
Diphosphorus has a unique electronic structure with a triple bond between the two phosphorus atoms. This triple bond makes the molecule highly reactive and unstable, as it seeks to break apart and form more stable bonds with other atoms. As a result, diphosphorus is a useful starting material for the synthesis of other phosphorus-containing compounds.
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Which type of light has the longest wavelength?
Group of answer choices
Gamma-rays
Microwave
Infrared
Radio
Is c2h2 polar or nonpolar ?
C₂H₂ is a nonpolar molecule.
Acetylene, commonly referred to as ethyne, is an organic chemical substance with the formula C₂H₂. This substance is a hydrocarbon since its entire atomic structure consists of hydrogen and carbon.
This is because the two carbon atoms form a triple bond with each other, and the two hydrogen atoms form single bonds with the carbon atoms. The electronegativity difference between carbon and hydrogen is very small, so the bonds are considered nonpolar.
Additionally, the molecule has a linear shape, which means that the charge distribution is symmetrical and there is no overall polarity. Therefore, C₂H₂ is a nonpolar molecule.
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