The electron configuration for each element is:
Al: [He] 2s2 2p6, [He]2s2 2p6; 1s2 2s2 2p6 3s2 3p1Na: [Ne] 3s1, [Ne]3s1; 1s2 2s2 2p6 3s1Ca: [Ar] 4s2, [Ar]4s2; 1s2 2s2 2p6 3s2 3p6 4s2Zr: [Kr] 5s2 4d2, [Kr]5s2 4d2; 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d2Ga: [Ar] 3d10 4s2 4p1, [Ar]3d10 4s2 4p1; 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1As: [Ar] 3d10 4s2 4p3, [Ar]3d10 4s2 4p3; 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3Bi: [Xe] 4f14 5d10 6s2 6p3, [Xe]4f14 5d10 6s2 6p3; 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 4f14 5d10 6s2 6p3Hg: [Xe] 4f14 5d10 6s2 6p2, [Xe]4f14 5d10 6s2 6p2; 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 4f14 5d10 6s2 6p2Co: [Ar] 3d7 4s2, [Ar]3d7 4s2; 1s2 2s2 2p6 3s2 3p6 4s2 3d7Pt: [Xe] 4f14 5d9 6s1,The electron configuration of an atom is the arrangement of electrons in its atomic orbitals. This arrangement is determined by the number of protons in the atom's nucleus and the energy levels of the electrons.
Electron configurations describe the distribution of electrons in the orbitals of an atom and are used to predict chemical properties and the behavior of atoms in a molecule. Electron configurations can be written in several ways, such as the condensed version, the noble gas core version, or the orbital filling version.
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sulfur-tethered methylene bridge-junction (stmbj) thiol methyl anchors: synthesis, characterization, and application in organic synthesis
Sulfur-tethered methylene bridge-junction (STMBJ) thiol methyl anchors are a type of chemical compound that is synthesized by attaching a methylene bridge to a sulfur atom through a thiol group.
These compounds are characterized by the presence of a sulfur atom, which acts as a tether, and a methylene bridge, which serves as a junction between the sulfur atom and the thiol group. They are used in organic synthesis as anchoring groups for various reactions and for the preparation of compounds with specific properties.
The synthesis of STMBJ thiol methyl anchors involves the use of chemical reactions, such as the reaction between a thiol and a carbonyl compound.
The characterization of these compounds is typically carried out using techniques such as infrared spectroscopy, nuclear magnetic resonance spectroscopy, and mass spectrometry.
The application of STMBJ thiol methyl anchors in organic synthesis is in the preparation of compounds with specific properties and in the design of new chemical reactions.
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How many bonds are broken and how many bonds are formed C2H4 + O2 → CO2 + H2O
In this reaction, two bonds are broken and two new bonds are formed.
What kind of reaction does CH4 O2 CO2 H2O have with water?Exothermic combustion occurs when octane or methane are used; It gives off energy. CH4 + 2 oxygen + CO2 + 2 water + energy The products have lower energies than the reactants.
What is an example of a balanced chemical equation?Take, for instance, the reaction: 2Mg(s)+O2(g)2MgO(g): The reactant and product sides contain two oxygen atoms and two magnesium atoms in this reaction. As a result, the chemical reaction is a balanced chemical equation because it complies with the law of conservation of mass.
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lactic acid produced in skeletal muscles travels to the liver where converts it to pyruvic acid.
Muscle-generated L-lactic acid travels through the bloodstream to the liver and from the cytosol to the mitochondria. In the matrix, L-lactate metabolism leads to pyruvate (PYR) via m-L-LDH and then to oxaloacetate (OAA) and malate (MAL) produced by mitochondria via three putative .
Lactate is oxidized to pyruvate by lactate dehydrogenase. Pyruvate is transported to mitochondria and converted to oxaloacetate by fermentation (anaerobic breakdown of glucose) by pyruvate carboxylase (produced in liver, muscle cells, red blood cells, etc.). It is formed during strenuous exercise when the body breaks down glucose without oxygen. Lactic acid is converted to pyruvate by the enzyme lactate dehydrogenase.
Colycycle and alanine cycle.
In the Coli cycle, glucose is metabolized to pyruvate in muscle and then to lactate, which is released into the blood and transported to the liver where it is converted to pyruvate and used for gluconeogenesis, resulting in The resulting glucose is released back to the muscle.
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curved arrow notation is used to show the movement of an electron ___. the base of the arrow begins at the source of the electrons, which is either a or a lone pair. the tip of the arrow points to the destination of the electrons.
Curved arrow notation is used to show the movement of an electron in a chemical reaction. The base of the arrow begins at the source of the electrons, which is either a or a lone pair. the tip of the arrow points to the destination of the electrons.
What is a chemical reaction?This refers to a process in which one or more substances, also known as reactants, are converted to one or more different substances, called products. Substances are either chemical elements or compounds.
The five basic types of chemical reactions namely:
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.
which of the following is a true statement about how living organisms use energy and chemicals to carry out life's activities? a)Both energy and chemicals cycle within an ecosystem.
b)Both energy and chemicals flow through an ecosystem.
c)Energy cycles within an ecosystem, but chemicals flow through it.
d)Energy flows through an ecosystem, but chemicals cycle within it.
The correct answer is d) Energy flows through an ecosystem, but chemicals cycle within it. This is because energy is transferred through the food chain and is converted into chemical energy by the organisms, while chemicals cycle through the ecosystem as they are recycled by the organisms.
Energy is transferred from one organism to another through the food chain, as one organism consumes another. This energy is then converted into chemical energy, which is used by the organism for its metabolic processes.
The chemicals used in these processes are then recycled through the ecosystem, as they are taken up by other organisms and eventually returned to the environment. This cycle of energy and chemicals is essential for the functioning of an ecosystem and for maintaining balance within the environment.
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Help Asha balance the following equation by completing the equation with the correct numbers:__H2 + __F2equation __HF
The blank energy of a particle is due to its blank compared to other particles and typically blank when particles get farther apart.
HELP
Convert a density of 7.2g/mL into the unit KG/L
By unit conversion the density of 7.2gmL is equal to 7.2 kg/L.
What is unit conversion?Unit conversion is the process of converting different units of measurement for the same quantity, typically using multiplicative conversion factors.Unit conversion is a multi-step process that involves division or multiplication by a numeral factor.To convert the units we have to construct a fraction equal to one, multiply the original measurement by that fraction, and simplify.Here given, the density = 7.2 g/mL
Since,
We know that,
1g = 0.001 kg a
And also,
1mL = 0.001L
Now, let's convert 7.2 g/mL to kg/L:
7.2 g/mL x 1kg/1000g x 1000mL/1L
= 7.2 kg/L
As a result, by the unit conversion the density 7.2 g/mL is converted to 7.2 kg/L.
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a doctor orders 2 tablets of amoxicillin per day for 11 days. If each tablet contains 375 mg of amoxicillin, how many mg of amoxicillin is given to the patients over those 12 days?
Dimensional analysis only
To find the total amount of amoxicillin given over 11 days, we can use dimensional analysis.
Start by identifying the known quantities: 2 tablets per day and 375 mg per tablet.
Next, identify the unknown quantity: the total amount of amoxicillin given over 11 days (in mg).
Write the equation using the known quantities and the unknown quantity:
(2 tablets/day) x (375 mg/tablet) x (11 days) = unknown quantity
Use the units to cancel out units and get the final result:
2 x 375 x 11 = 8250 mg
So, over 11 days, the patient will receive 8250 mg of amoxicillin.
question 6 options:the majority of autotrophs on earth require aerobic respiration in order to survive.heterotrophs are dependent on autotrophs to generate o2 from h2o in order to support aerobic respiration.heterotrophs evolved on earth before autotrophs.heterotrophs depend on autotrophs for conversion of light energy to chemical energy.there are no metabolic differences between autotrophs and heterotrophs.heterotrophs that do not eat autotrophs every day will die in a short time.autotrophs depend on heterotrophs to oxidize sugar and release co2 into the atmosphere.the majority of heterotrophs on earth do not use aerobic respiration as a form of energy conversion.
Three statements regarding autotrophs and heterotrophs on Earth that true are:
(4) "Heterotrophs are dependent on autotrophs to generate O2 from H2O in order to support aerobic respiration".(5) "Heterotrophs depend on autotrophs for the conversion of light energy to chemical energy".(8) "The majority of autotrophs on Earth require aerobic respiration in order to survive".The other statements are incorrect. The following are the rationales:
(1) Heterotrophs can survive by eating other sources of food besides autotrophs, such as other heterotrophs, dead organic matter, or symbiotic relationships with autotrophs. They do not necessarily need to eat autotrophs every day to survive.(2) There is a wide range of heterotrophs on Earth, and some do use aerobic respiration as a form of energy conversion, while others may use anaerobic respiration, fermentation, or other metabolic pathways.(3) Autotrophs do not depend on heterotrophs to oxidize sugar and release CO2 into the atmosphere. Photosynthesis or chemosynthesis can be used by autotrophs to make organic compounds from carbon dioxide in the air or water.(6) Autotrophs and heterotrophs do have different metabolic processes. Autotrophs can make their own food through photosynthesis or chemosynthesis, while heterotrophs need to get energy from outside sources.(7) Autotrophs evolved before heterotrophs and are considered to be the primary producers in the food chain. Heterotrophs evolved later and depend on autotrophs for food.The statements that are true are 4, 5, and 8, as heterotrophs are dependent on autotrophs for the generation of O2 to support aerobic respiration and the conversion of light energy to chemical energy, and the majority of autotrophs on Earth require aerobic respiration in order to survive.
This question should be provided as:
Which three of the following statements about autotrophs and heterotrophs on Earth are true?
Heterotrophs that do not eat autotrophs every day will die in a short time.The majority of heterotrophs on Earth do not use aerobic respiration as a form of energy conversion.Autotrophs depend on heterotrophs to oxidize sugar and release CO2 into the atmosphere.Heterotrophs are dependent on autotrophs to generate O2 from H2O in order to support aerobic respiration.Heterotrophs depend on autotrophs for conversion of light energy to chemical energy.There are no metabolic differences between autotrophs and heterotrophs.Heterotrophs evolved on Earth before autotrophs.The majority of autotrophs on Earth require aerobic respiration in order to survive.Learn more about autotrophs here: brainly.com/question/16989903
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Show the Schematic representation of a polarimeter?
A polarimeter fundamental working principle entails the following: By passing light via a polarizer, one can produce light with a precisely prepared linear polarisation state.
What are the uses of polarimeter?Polarimeters have a wide range of uses, including determining the concentration and purity of chemicals in medications, maturation testing for agricultural products, and measuring the sugar content in beverages and candies.A polarimeter is made up of a light source, a monochromator (which reduces the light's spectrum to just one wavelength), a polarizer (which turns the beam of light into plane polarised light), a sample tube (which holds the sample being measured), a second polarizer (which determines the degree of rotation), and a light detector.By directing monochromatic light through two polarising plates, polarimeters calculate the optical activity. Sodium light is utilised because it has a high energy output and provides monochromatic light with a wavelength of 589 nm.To learn more about polarimeter refer to:
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If 100 cm3 of oxygen reacts with 30 cm3 of methane in the following reaction, how much oxygen will be left at the end of the reaction?
CH4(g)+2O2(g) → CO2(g)+2H2O(l)
Answer:
If it's liquid, this is the total volume:300+100= 400 cm3
Explanation:
CH4 + 2O2 –––> CO2 + 2 H2O
100 . . 500. . . . . . 0 . . . . . .0. . . (initial)
100. . . 200 . . . 100 . . . . .200 . . (reaction)
0. . . . 300 . . . 100 . . . . . 200 . .(final)
H2O can be either gas or liquid. If it is gas, this is the total volume of gases : 300 + 100 + 200 = 600 cm3
If it's liquid, this is the total volume:300+100= 400 cm3
Hi just need quick help
In DNA codons , A DNA or RNA molecule that codes for a specific amino acid by a group of three consecutive nucleotides.
How many DNA codons are there?The stop codons, which signal that translation has finished, are UAA, UAG, and UGA.A DNA or RNA molecule that codes for a specific amino acid by a group of three consecutive nucleotides. The beginning or end of translation is indicated by specific codons. Start, stop, or termination codons are what are referred to as these.An RNA or DNA strand's codon is a group of three nucleotides. Codons are three-letter words that each make up a portion of the DNA (or RNA) instructions, which are made up of all of these codons collectively. Only 64 potential codons are conceivable since DNA and RNA both contain only four nucleotides.The complete question is,
What are the codons in DNA?
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Consider the chemical equations shown here.
2Na(s) + Cl₂(g) → 2NaCl(s)
4Na(s) + O₂(g) → 2Na₂O(s)
What is the overall equation for the reaction that produces NaCl and O₂ from Na₂O and Cl₂?
O Na₂O(s) + Cl₂(g) →NaCl(s) + O₂(g)
O
2Na₂O(s) + Cl₂(g) →2NaCl(s) + O₂(g)
O 2Na₂O(s) + 2Cl₂(g) →4NaCl(s) + O₂(g)
The chemical equations, NaCl + O2 + 2Na2O + 2Cl2 + 4,The less reactive oxygen gas from the molecule sodium oxide is replaced by the more reactive chlorine gas.
2Na Cl2 2NaCl: What kind of reaction is that?Examples of combination reactions include the reaction 2Na + Cl2 = 2NaCl. When one reactant decomposes into two or more products, as in AB => A + B, a decomposition reaction will take place. When two or more substances come together to form a single compound, for example, A + B => AB, this reaction is known as a combination reaction.The less reactive oxygen gas from the molecule sodium oxide is replaced by the more reactive chlorine gas. The right answer is equation (C), as it is balanced because there are an equal number of each sort of atom on each side. 4 sodium atoms, 4 chloride atoms, and 2 oxygen atoms are present on both sides, as well as the same number of sodium atoms on the left and right.To learn more about chemical equations refer to:
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Consider this reaction: 6 CO2 + 6 H2O + light equation C6H12O6 + 6 O2
If there were 2.38 x 102 g of H2O, 18.6 moles of CO2, and plenty of light, what would be the theoretical yield of the reaction?
As per the balanced reaction, 6 moles of water gives one mole of glucose. Here the limiting reactant is water. 238 g or 13.2 moles of water will give, 396 g or 2.2 moles of glucose.
What is photosynthesis ?The photosynthetic reaction involves the combination of water and carbon dioxide producing glucose and oxygen gas. The reaction takes place in the presence of light.
As per the given chemical equation 6 moles of water and 6 moles of carbon dioxide gives one mole of glucose.
molar mass of water = 18 g/mol
no. of moles in 238 g of water = 238 /18 = 13.22 moles.
no.of carbon dioxide = 18.6
Thus, water is the limiting reactant here.
Number of moles of glucose produced from 13.2 moles of water is :
= (13.2/6) = 2.2 mole.
molar mass of glucose = 180 g.
Then mass of 2.2 mol = 2.2 × 180 = 396g.
Therefore, the theoretical yield of the reaction will be 396 g of glucose.
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The strongest intermolecular interactions between hydrogen sulfide (H2S) molecules arise from:
A. dipole-dipole forces
B. London dispersion forces
C. hydrogen bonding
D. ion-dipole interactions
E. disulfide linkages
The strongest intermolecular interactions between hydrogen sulfide (H2S) molecules arise from dipole-dipole forces.
Sodium sulphide:
It is a peculiar chemical substance that emits a deadly gas and is highly combustible, corrosive, and toxic. At low concentrations, it smells like rotten eggs. It is created when organic material undergoes microbial decomposition in the absence of oxygen. It can be found in natural gas, crude oil, sewage, and other places.
Molecule-to-molecule force:
The electrostatic force of attraction between the molecules is what causes the intermolecular forces to exist. Ionic forces (ion to ion forces and ion to an induced dipole forces), dipole-dipole forces (hydrogen bonding, permanent dipole-permanent dipole, and permanent dipole-induced dipole forces), and Van der Waals forces are three different forms of intermolecular forces (induced dipole to induced dipole).
Strongest intermolecular hydrogen sulphide force:
The London dispersion force and the London scattering force are two of the weakest forces, and it is known to emphasise the dipole-dipole interaction. Due to the substantial difference in electronegativity between hydrogen and sulphur, their bond is polar. As a result, dipole-dipole interactions are what happen between molecules.
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ionic liquid enables highly efficient low temperature desalination by directional solvent extraction
Generally, ionic liquids (ILs) are composed of cations and anions, and their melting points are generally below 100°C. Ionic-liquid-based extraction is defined as a novel separation method, which applies ILs as diluents and/or extractants for solvent extraction.
Seawater desalination plays an important role in addressing the global water shortage challenge. Directional Solvent Extraction (DSE) is one of the emerging non-membrane desalination technology that features the ability to utilize very low temperature waste heat (as low as 40 °C).
This process is enabled by the subtly balanced solubility properties of directional solvents, which do not dissolve in water but can dissolve water and reject salt ions.
The given question is incomplete and the complete question is given below.
"Ionic liquid enables highly efficient low temperature desalination by directional solvent extraction", Justify the statement.
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Balance ClO2(aq)+H2O(l)→HClO2(aq)+HClO3(aq)
Answer:
2ClO2 + H2O → HClO2 + HClO3
Explanation:
pls tell me if wrong have a good day/night<3
The number of chlorine atom on left is 1 while on right side is 2. The balanced equation is 2ClO[tex]_2[/tex]+ H[tex]_2[/tex]O → HClO[tex]_2[/tex] + HClO[tex]_3[/tex]
An equation per a chemical reaction is said to be balanced if both the reactants or the products have the same number of atoms and total charge for each component of the reaction. In other words, each side of the reaction have an equal balance of mass and charge. The components and outcomes of a chemical reaction are listed in an imbalanced chemical equation, but the amounts necessary to meet the conservation of mass are not specified.
The skeletal equation is ClO[tex]_2[/tex]+ H[tex]_2[/tex]O → HClO[tex]_2[/tex] + HClO[tex]_3[/tex]
The number of chlorine atom on left is 1 while on right side is 2. Multiply the reactant by 2. The balanced equation is 2ClO[tex]_2[/tex]+ H[tex]_2[/tex]O → HClO[tex]_2[/tex] + HClO[tex]_3[/tex]
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An atom is to a mole as
A.
A dozen is to an egg
B.
An egg is to a dozen
C.
A goose is to a gaggle
D.
Both B and C
According to a mole, an atom is A particle that matter that specifically specifies a chemical element is like an egg to a dozen and like a goose to a gaggle.
The correct answer is D
Name an atom.Atoms are a particular kind of material particle that make up a chemical element. The core nucleus of an atom is surrounded by electrons that are either positively charged or negatively charged in large numbers. The positive charges nucleus, which is composed of two comparatively large particles called protons and neutrons, may exist.
What is an atom, and how are they used?The positively and negatively charged protons and neutrons that make up the majority of atoms are encircled by a cloud of negatively charged electrons. At its most basic level, an atom would be any particle of stuff.
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Steve races to the nearest taco stand at lunchtime and sees that his pedometer recorded his peak speed at 108.9 cm/s. What was Steve's peak speed in kilometers per hour?
Steve's peak speed in kilometers per hour is 3.9204 km/h.
How to convert speed?Speed is the rate of motion or action, specifically the magnitude of the velocity.
Speed is the rate distance is traversed in a given time. According to this question, Steve races to the nearest taco stand at lunchtime and sees that his pedometer recorded his peak speed at 108.9 cm/s.
Unit of speed in centimetres per second can be converted to kilometre per hour as follows:
1 centimetre per second = 0.036 kilometre per hour
108.9cm/s = 3.9204 km/h
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I need help as soon as possible please!!
All the given combinations results in ionic compounds by electron donating from metals. The compound formed between sodium and chlorine is NaCl and that of magnesium and oxygen is MgO.
What are ionic compounds ?Ionic compounds are formed between metals and non-metals. Metals are electron rich and will easily loss electrons to electron deficient nonmetals.
Sodium chloride or NaCl is formed by donating one electron from the sodium metal to the chlorine atom. Similarly magnesium donates its two valence electrons to oxygen forming MgO.
The valency of both Al and N is 3. Al donates its 3 electron to N and forms aluminum nitride AlN.
Similarly, potassium and sulphur forms potassium sulphide K₂S, where, each potassium metal donates one electron to sulphur atom.
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dispersion forces are a type of: select the correct answer below: intermolecular force van der waals force electrostatic interaction all of the above
According to the forces of attraction, dispersion forces are a type of van der waals forces.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
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A mass of 2.3g of an unknown solute is added to 14.3 benzene. (Kf = 5.12 C) The freezing point decreased by 5.1. What is the molar mass of the solute?
The molar mass of the solute is 163 g/mol.
What is molar mass?Molar mass can be defined as the mass in grams of one mole of a substance. The units of molar mass are grams per mole abbreviated as g/mol.
The molar mass of the solute can be calculated using the equation:
ΔTf = Kf * molality
molality = ΔTf / Kf
molality = 5.1 / 5.12
molality = 0.99 g/mL
Since the molality is the number of moles of solute per 1 kilogram of solvent, we can find the number of moles of solute in 14.3 g of benzene.
n = molality * (14.3 g) / 1000 g/kg = 0.014 moles
The molar mass of the solute can be calculated as:
molar mass = (2.3 g) / (0.014 moles) = 163 g/mol.
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Please answer my question.
Using standard thermodynamic data at 298K, the entropy changes of the environment when 1.59 mol of P₄O₁₀ (s) is irritated at standard conditions is - 45339.5 J/K
∆H°f product is the total enthalpy of standard formation based on the product substances. ∆H°f reactants is the total enthalpy of the standard formation based on the reactants.
We know:
∆H⁰f (P₄O₁₀) = - 2984 KJ/mol
∆H⁰f (H₂O) = - 285.8 KJ/mol
∆H⁰f (4H₃PO₄) = - 1288.3 KJ/mol
The e reaction is:
P₄O₁₀ (s) + 6H₂O (l) → 4H₃PO₄ (aq)
∆H⁰rxn = ∆H⁰f products - ∆H⁰f (reactants)
∆H⁰rxn = [4∆H⁰f (P₄O₁₀)] - [1 ∆H⁰f (P₄O₁₀) + 6 ∆H⁰f (H₂O)]
∆H⁰rxn = [4(- 1288.3)] - [ 1(- 2984) + 6(- 285.8)]
∆H⁰rxn = [ - 5153.2] - [ -11936 - 1714.8]
∆H⁰rxn = [- 5153.2] - [-13650.8]
∆H⁰rxn = - 5153.2 + 13650.8
∆H⁰rxn = 8497.6 KJ
Therefore, ∆H⁰rxn for this reaction is + 8497.6 KJ.
From the above-balanced chemical equation, we can write,
For the reaction of 1 mol of P₄O₁₀,
∆H⁰rxn value = + 8497.6 KJ
Then, for the reaction of 1.59 mol of P₄O₁₀, ∆H0rxn value
= + 8497.6 KJ/1 mol x 1.59 mol
= + 13511.184 KJ
We know,
∆S⁰surroundings = - ∆H⁰rxn/ T
Where,
∆S⁰surroundings = standard entropy changes of the surroundings
∆H⁰rxn = standard enthalpy changes of the reaction
T = temperature in Kelvin
Here,
∆H0rxn = 13511.184 KJ = 13511.184 x 10³ J = 13511184 J
T = 298 K
Now,
∆S⁰surroundings = - ∆H⁰rxn/ T
∆S⁰surroundings = - 13511184J/298 K
∆S⁰surroundings = - 45339.5 J/K
Therefore, the entropy changes for the surroundings when 1.59 mol of P₄O₁₀ reacts at standard conditions is - 45339.5 J/K
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Give an example of an endothermic reaction
Answer: photosynthesis
Explanation:
Answer:
The chemical reactions which occurs by absorption of heat are called endothermic reactions.
Examples : Melting of ice cubes.
Explanation:
Melting solid salts.
N2(g) + O2(g) + heat = 2NO(g)
So,
N= Nitrogen
O= Oxygen
NO= Nitric
Determine the number of neutrons in each of the following atoms given the mass number and atomic number. 1. An atom of oxygen with a mass number of 17 and an atomic number of 8 has a total of 9 neutrons. 2. An atom of aluminum with a mass number of 24 and an atomic number of 13 has a total of 11 neutrons. 3. An atom of phosphorous with a mass number of 31 and an atomic number of 15 has a total of 16 neutrons. 4. An atom of potassium with a mass number of 39 and an atomic number of 19 has a total of 20 neutrons. 5. An atom of fluorine with a mass number of 19 and an atomic number of 9 has a total of 10 neutrons.
The number of neutrons in an atom varies and can be determined by the atomic number of the element. The atomic number is the number of protons in the nucleus of an atom and defines the element. The number of neutrons can be calculated by subtracting the atomic number from the mass number, which is the total number of protons and neutrons in the nucleus.
For example, the most common isotope of carbon has 6 protons and 6 neutrons, so its atomic number is 6 and its mass number is 12. The number of neutrons in this isotope of carbon is 12 - 6 = 6.
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Directions: Each set of lettered choices below refers to the numbered statements immediately following it. Select the one lettered choice that best fits each statement. A choice may be used once more, more than once, or not at all in each set. Which one has the largest radius?
A. Cs
B. Ag
C. Pb
D. Br
E. Se
Out of the elements listed (Cs, Ag, Pb, Br, Se), the element with the largest atomic radius is Cs (cesium).
The largest atomic radius refers to the size of an atom, which is determined by the distance between the nucleus and the outermost electrons.
Key points:
Cs is a member of the alkali metal group, which are known for their large atomic sizes due to their low electron shielding and effective nuclear charge.The size of an atom increases as you move down the periodic table, as the electron shielding effect is more prominent and the effective nuclear charge decreases.Cs has the largest atomic number (55) among the elements listed, which contributes to its larger atomic size.Learn more about atomic radius here:
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Calculate the pH for the following concentration: [H3O+] = 5.77 x 10-7 M
The pH of a solution with a concentration of 5.77 x 10-⁷ M is 6.24.
How to calculate pH?pH refers to the quantitative measure of the acidity or basicity of aqueous or other liquid solutions.
The pH of a substance can be calculated using the following expression:
pH = -log H
Where;
H = concentration of acidAccording to this question, the concentration of a solution is 5.77 × 10-⁷M. The pH can be calculated as follows:
pH = - log 5.77 × 10-⁷M
pH = 6.24
Therefore, 6.24 is the pH of the solution
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1 cup=8 oz and 8 oz=1 cup
300.mL=1 can and 1 can=300.mL
You just created the equality 1 fluid oz = 29.7 mL.
Use this equality to determine how many ounces of water will be measured using the measuring cup introduced before Part A when making the cake. Keep in mind that the level of precision for the measuring cup is to the half-ounce as you round your answer.
Express your answer numerically in ounces to two significant figures.
Rounding to the nearest half-ounce, the answer is 8 oz to two significant figures.
What is the measure?Generally, We are given:
1 cup = 8 oz
1 fluid oz = 29.7 mL
So, 1 cup = 8 fluid oz
= 8 * 29.7 mL
= 237.6 mL
To find the number of ounces of water measured using the measuring cup, we divide the volume in mL by the conversion factor from mL to oz:
237.6 mL / 29.7 mL/oz = 8 oz
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There is always some form of_______ exchanged in both chemical and physical changes.
A. Energy
B. Volume
C. Mass
D. Density
