3.09 minutes is the half-life of polonium-218 if a sample decays from 55. 4 g to 31. 7 g in 2. 50 minutes.
What is half-life?
The half-life of a radioactive sample is the amount of time it takes for half of its atomic nuclei to spontaneously transform into different nuclear species and emit particles and energy, or, more precisely, the amount of time it takes for the radioactive sample to disintegrate at a rate of one disintegration per second.
The rate constant for a first-order reaction and its half-life are connected by the constant t1/2 = 0.693/k.
Therefore, 3.09 minutes is the half-life of polonium-218 if a sample decays from 55. 4 g to 31. 7 g in 2. 50 minutes.
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which of the following statements correctly describe the relative stabilities of resonance forms? select all that apply. multiple select question. a resonance structure with multiple bonds is always preferred to a resonance structure with only single bonds. a resonance structure with like charges on adjacent atoms is more stable than one with opposite charges on adjacent atoms. a resonance structure with formal charges closer to zero on individual atoms is preferred. a resonance structure is more stable if a negative charge resides on a more electronegative atom.
A resonance structure with formal charges closer to zero on individual atoms is preferred and resonance structure is more stable if a negative charge resides on a more electronegative atom.
Chemistry concept known as the theory of resonance that postulates that a molecule's actual normal state is represented by a combination of several alternative distinct structures rather than by a single valence-bond structure. The molecule is then said to have a structure that is a resonance hybrid of these structures or to resonate among the various valence-bond structures. The molecule is said to be stabilized by resonance when the calculated energy for a resonance hybrid is lower than the energies of any of the alternative structures. Resonance energy is the difference between the energies of any alternative structure and the energies of the resonance hybrid.
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Predict the neutral organic product of the following reaction. When drawing hydrogen atoms on a carbon atom, either include all hydrogen atoms or none on that carbon atom, or your structure may be marked incorrect.
The oxygen of water molecule being electron rich abstracts the proton from the oxonium ion to form hydronium ion.
What is neutral organic?
The microbial decay of dead plant and animal matter is what causes NOM to exist in the environment. The Chemistry of Silica and Zeolite-Based Materials
What is hydrogen atom?
The chemical element hydrogen is represented by the atom known as hydrogen. The Coulomb force holds one negatively charged electron and one positively charged proton to the nucleus of the electrically neutral atom, which has one proton that is positively charged. Of the universe's total baryonic mass, atomic hydrogen accounts for about 75%.
The given reaction is an acid catalyzed hydration of alkenes. The hydration reaction converts an alkene to an alcohol.
Hydration of alkenes involves the conversion of alkenes to alcohols via the addition of water. Acid catalyzed hydration involves the presence of an acid such as sulphury acid.
Since, a carbocation is formed in the acid catalyzed hydration of alkenes, hence carbocation rearrangement occurs to form a more stable carbocation.
In the above step, the attack of double bond on the hydronium ion takes place to form a 2° carbocation. The direction of electrons is from the electron rich π bond to proton.
In the above step, the nucleophilic attack of water takes place on the secondary 2° carbocation to form the oxonium ion. The direction of movement is from the electron rich water molecule to the electron deficient carbocation species.
Finally, in the above step, the deprotonation of the oxonium ion takes place to form cyclooctane. The oxygen of water molecule being electron rich abstracts the proton from the oxonium ion to form hydronium ion.
Therefore, the oxygen of water molecule being electron rich abstracts the proton from the oxonium ion to form hydronium ion.
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What is retort stand used for?
And what are biohazardous substances?
Answer:
See explanation
Explanation:
A retort stand is a piece of scientific equipment intended to support other pieces of equipment and glassware — for instance, burettes, test tubes and flasks.Biohazardous waste products include infectious waste, animal waste, used sharps, discarded vaccines, and pathological waste.(a) the disorder alters glucose metabolism. describe the atoms and types of bonds in a glucose molecule.
in the disorder alters glucose metabolism, Covalent bonds hold carbon, hydrogen, and oxygen atoms together in a glucose molecule.
This glucose molecule is made up of six carbon atoms bonded together in a chain, along with oxygen and hydrogen atoms. C6H12O6 is the chemical formula for glucose. Glucose is an aldehyde-containing monosaccharide (-CHO) Covalent bonds form between nonmetals in general. The formation of ions occurs when one metal and a nonmetal convers. Carbon, hydrogen, and oxygen combine to form glucose. Because they are all nonmetals, they form covalent bonds.
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A beryllium ion with a single electron (denoted $Be^{3+} ) is in an excited state with radius the same as that of the ground state of hydrogen.a. What is n for the Be3+ ion?b. How much energy in eV is needed to ionize the ion from this excited state?
When conduct electricity an ion from this excited state, 54.4 eV of energy must be provided.
What is an definition of energy?
Energy is referred to and by scientists as the capacity for work. People have figured out how to transform energy from one type to another and then use it to accomplish tasks, making modern civilization possible. Chemical, electrical, radiant, mechanical, thermal, and nuclear energy are the six main types of energy. Additional forms including electrochemical, acoustic, electromagnetic, and others might be addressed in other studies.
Briefing:
Since this electron has an energy of,
E₂=-Z²*13.6/n² eV
=-4²*13.6/2² eV
=-54.4eV
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three of the four structure have the same bonding sequence. which structure is an isomer of the other three?
The compound mentioned in option D having structure which is isomer of other three given option. And the rest three compound are same. Hence the correct option is D.
What are some examples of isomers?Isomers are substances that have exactly the same number of atoms, i.e., the same empirical formula, but differ from one another by the way in which the atoms are arranged. Several isomers with the formula C₈H₁₀ include ethylbenzene, m-xylene, p-xylene, and o-xylene. Isomers are chemical compounds that have the same chemical formula but have different characteristics and atom arrangements in the molecule. Isotopes are various atoms of a single element. Isomers are distinct substances with the same molecular structure. The number of neutrons distinguishes isotopes from each other, whereas the arrangement of the atoms distinguishes isomers.
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The complete question is as follows:
what is the mass in kilograms of 1.20x10^28 atoms of copper, Cu?
Answer: Mass of 1 atom of Cu=63.546 A.M.U
=63.546×1.66×10^(-27) kg
= 105.48636×10^(-27) kg
So,
Mass of 1.2×1038 atoms of Cu
= 1.2×1028×105.48636×10^(-27) kg
= 130127.973696×10^(-27) kg ANS !!!!
Cold packs, whose temperatures are lowered when ammonium nitrate dissolves in water, are carried by athletic trainers when transporting ice is not possible. Which of the following is true of this reaction?
Group of answer choices
ΔH = 0, since cold packs are sealed
ΔH > 0, process is endothermic
ΔH > 0, process is exothermic
ΔH < 0, process is exothermic
ΔH < 0, process is endothermic
When sports trainers transfer cold packs, which have temperatures dropped when ammonium nitrate dissolves in water when ice cannot be transported, the process is endothermic (Î"H > 0).
For what is nitrate renowned?For the growth of plants in particular, and therefore for other species that get their nourishment from plants, they serve as a significant supply of nitrogen. Nitrates are used for a number of things, such as fertilizers, food preservatives, drugs, and explosives.
Why do nitrates cause toxicity?Nitrate poisoning may be dangerous, especially for infants. Methemoglobinemia may result from excessive nitrate consumption, which can alter how blood delivers oxygen (also known as blue baby syndrome). The risk of developing methemoglobinemia is higher in infants who are bottle-fed and under six months old.
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what is the calcium ion concentration, [ca2 ], in 1.5m calcium chloride, cacl2? what is the chloride ion concentration, [cl1-]?
For every mole of calcium chloride you get one mole of Ca2+ and 2 moles of chloride. So the molarity of calcium 2+ is 1.5 M and the molarity of the chloride is 3.0 M
What is Molarity?
Since most reactions take place in solutions, it's critical to comprehend how the substance's concentration is expressed in a solution. The quantity of compounds in solution can be determined in a variety of methods.
The concentration of salts in the alkaline solution is represented by its molarity (M). The amount of fundamental substance needed to prepare the solution rises as molarity does. Molarity is crucial for the growth of strength.
The number of moles of dissolved solute per litre of solution is the definition of molarity, a unit of concentration. Molarity is defined as the number of millimoles per millilitre of solution by dividing the number of moles and the volume by 1000.
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continue adding salt to the solution until undissolved salt remains on the bottom of the container. this is now a (a) solution because no more sodium chloride can dissolve. the simplest ratio of ions in the solution is (b) sodium ion to (c) chloride ion and the simplest ratio of ions bound in the solid is (d) sodium ion to (e) chloride ion.
Continue adding salt to the solution until undissolved salt remains on the bottom of the container. this is now a (a)saturated solution because no more sodium chloride can dissolve. The simplest ratio of ions in the solution is (b)1 sodium ion to (c) 1 chloride ion and the simplest ratio of ions bound in the solid is (d) sodium ion to (e) chloride ion.
Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by means of water molecules, as this diagram indicates. as soon as this happens, the salt is dissolved, resulting in a homogeneous solution .
Dissolving a solid in liquid, inclusive of desk salt in water, is a bodily exchange because only the country of the matter has changed. A not unusual misconception approximately dissolving is that heating and/or stirring are required for the dissolving process to arise. on this observe, quantitative experimental evidence turned into accrued and analyzed to illustrate that neither heating nor stirring is required for dissolving.
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how to solve a titration problem for how many ml of a solution you need to reach the secodn equivalence point knowing the starting volume and the balanced equation
Your base titrant volume reading was 1.18 mL at the start of the titration. The base titrant volume was 23.00 mL when the titration was finished and the endpoint was reached.
When just enough titrant is added to completely neutralize the analyte solution during titration, this is known as the equivalence point. Molecules of base equal molecular weights of acid at the equivalence point in an acid-base titration and the solution is made up entirely of salt and water.
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what atomic or hybrid orbital on the central i atom makes up the sigma bond between this i and an outer f atom in iodine pentafluoride, if5 ? orbital on i what are the approximate f-i-f bond angles ? (list all possible separated by a space) .
The electronic configuration of iodine is [Kr] 4d10 5s2 5p5.
During chemical bonding, two 5p electrons of iodine get excited and shift to two separate empty 5d atomic orbitals. The 5s, three 5p, and two 5d atomic orbitals of iodine hybridize to yield six sp3d2 hybrid orbitals.
One of these six hybrid orbitals contains paired electrons. These paired electrons are situated as a lone pair on the central I atom in IF5. The remaining five sp3d2 hybrid orbitals contain a single electron each which they use for sigma bond formation with the p orbitals of fluorine atoms in IF5, one on each side of the molecule, as shown below.
The F-I-F bond angle in the IF5 molecule is 81.9°. Electronic repulsions present in the molecule distort the geometry or shape of the molecule and decrease the bond angle.
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explain why the spectra belongs with methyl butanoate. did the spectra you picked match your initial description?
The methyl butanoate is the ester. the ester contains C = O, carbonyl stretching is found about the 1735 cm⁻¹.
The methyl butanoate is from the ester family. it is also called as methyl butyrate. it is colorless liquid the odor of methyl butanoate is like an apple. methyl butanoate is used as solvent. the structure of methyl butanoate can be determine by the IR spectra. it is also used as an flavoring agent.
The methyl butanoate if from the methyl ester of butyric acid. the methyl butanoate is present is several plant product in very small amount. it is formed by the distillation from the essential oils of vegetable.
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what happens to the electron configuration of the outermost energy level as atomic number increases across a horizontal row?
As atomic number increases across a horizontal row, the electron configuration of the outermost energy level will become more complex.
This is because each successive element has one additional electron, which will be added to the highest-energy orbital available. As the atomic number increases, more orbitals will become available, which will increase the complexity of the electron configuration in the outermost energy level.
The Impact of Atomic Number Increases on the Electron Configuration of the Outermost Energy LevelIn the modern universe, the behavior of matter is a topic of great interest. The discovery of atomic structure in the mid-19th century changed the way scientists understood the behavior of matter. Atoms contain nuclei and electrons, and the number of the latter is determined by the atomic number.
The atomic number refers to the number of protons present in the nucleus of an atom. This means that the atomic number determines the number of electrons an atom possesses. These electrons are distributed in different energy levels, and the outermost energy level is the last to receive electrons. This means that the atomic number has a direct impact on the electron configuration of the outermost energy level.
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how many molecules of ch4 are in 48.2 g of this compound? question 19 options: 3.00 5.00 × 1024 4.00 2.90 × 1025 1.81 × 1024
In response to the question, 48.2 gram of CH4 contain 1.81*10²⁴ molecules of CH4.
What are some instances of molecules?A molecule is the simplest unit of any material that is composed of one or more elements and is capable of existing independently while maintaining all of the material's physical and chemical characteristics. Further atom division occurs within molecules. For instance, the symbols for the atom and molecule are O and O2, respectively.
Which four sorts of molecules are there?Large biomolecules can be divided into four categories: lipids, proteins, nucleic acids, and carbohydrates. Monomers called oligosaccharides, which comprise oxygen, oxygen, or hydrogen, are the building blocks of carbs.
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The complete question is-
How many molecules of ch4 are in 48.2 g of this compound?
(a). 3.00
(b). 4.00
(c). 2.90*10²⁵
(d). 5.00*10²⁴
(e). 1.81*10²⁴
part i: reviewing acid nomenclature name these acids: hclo h2cr2o7 h2co3 h3po4 what is the formula for nitric acid? 3. what is the formula for nitrous acid? part ii: acid and base dissociation (ionization) equations hydroiodic acid: 2. strontium hydroxide: 3.barium hydroxide: 4. sulfuric acid: part iii: neutralization reactions (include the molecular and new ionic equations for all reactions) done in class: nitric acid (strong acid) and sodium hydroxide (strong base). lithium hydroxide (strong base) and carbonic acid (weak acid). magnesium hydroxide(weak) and chlorous acid (weak). aluminum hydroxide(weak) and sulfuric acid (strong). write the chemical reaction when lithium hydroxide(strong) is mixed with phosphorous acid(weak). write the chemical reaction when potassium hydroxide(strong) is mixed with hydrobromic acid(strong). write the chemical reaction when barium hydroxide(strong) is mixed with acetic acid (weak). write the chemical reaction when iron (ii) hydroxide(strong) is mixed with phosphoric acid(weak).
Hydrochloric acid + sodium hydroxide -> sodium chloride + water
Sulphuric acid + copper hydroxide -> copper sulphate + water
Nitric acid + sodium hydroxide -> sodium nitrate + water
Hydrochloric acid + calcium hydroxide -> calcium chloride + water
Sulphuric acid + potassium hydroxide -> potassium sulphate + water
Hydrochloric acid + lithium hydroxide -> lithium chloride + water
Nitric acid + magnesium hydroxide -> magnesium nitrate + water
A strong acid is an acid that ionizes in water to give all its hydrogen ion. Weak acid only ionize to a certain degree. Acetic acid (CH3COOH) only ionize to give one hydrogen ion despite having other hydrogen atom.
A strong base is a base that ionizes in water to give all it hydroxide ion. Sodium hydroxide(NaOH) ionizes to give all its hydroxide ions.
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) what are the maximum (peak) mixing ratios of ozone (o3), nitric oxide (no), and nitrogen dioxide (no2) during these eight days?
These numbers show that the highest mean O3 concentration occurs during the daytime and is higher than it is at night. While there is a greater mean NO concentration at night.
O3 and NO2 exhibit a diurnal tendency, right?The NO, NO2 and NOx diurnal cycles resemble double waves. The morning peak is larger than the evening peak in size. The morning peak of NO2 arrives 1-2 hours after the NO peak, while the morning peaks of O3 appear roughly 6 hours, 5 hours, and 2 hours after the NO2 peak, respectively.
When do NOx gas levels peak during the day?The higher levels of NOx coincide with the peak hours for vehicular emissions, which are in the morning and evening.
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Calculate the volume (in ml) of 0. 100 m cacl2 needed to produce 1. 00 g of caco3(s).
1 gramme of calcium carbonate is needed to produce 1. 00 g of caco3(s).
Calcium carbonate does have a molar mass of 100.09 g/mol.
As a result, the number of moles of calcium carbonate = mass/molar mass. =1g/100.09g/mol = 0.01 mol, It is given the reaction of sodium carbonate and calcium chloride. CaCO3 + 2NaCl = Na2CO3 + CaCl2
One mole of calcium chloride reacts with one mole of sodium carbonate to produce one mole of calcium carbonate and two moles of sodium chloride.
one mole CaCl2 = one mole CaCO3
0.01 mol f CaCl2 = 0.01 mol CaCO3.
Calcium chloride molarity = 0.1 M
Molarity is characterised as the number of solute moles divided by the amount of solution.
volume of solution = 0.1 L = 100 mL = 0.01 mol/0.1 M
As a result of this, the volume of 0.1 M calcium chloride is 100 mL.
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Write the electron configuration of the oxygen atom?
Answer:
I think it's 2s^2 2p^4
Explanation:
NOT really sure but, I think its 2s^2 2p^4
Please, someone correct me if im wrong
ANSWER ⬇️⬇️⬇️⬇️⬇️⬇️
Answer:
electronic config. of oxygen = 2,6
substances that give a visibly colored solution can be analyzed using spectrophotometry. cu2 forms a complex with edta that is pale blue in aqueous solution. a chemist plans to determine the concentration of cu2 ions in solution using edta complexation, and the chemist obtains the following data using standard solutions. the path length of the cell used is 1.00 cm.
Ethylenediamine tetraacetic acid (EDTA) substances that give a visibly colored solution can be analyzed using spectrophotometry. cu2 forms a complex with edta that is pale blue in aqueous solution.
Abdominal cramps, nauseousness, vomiting, diarrhea, headaches, low blood pressure, skin issues, and fever are just a few of the side effects that EDTA can bring on. It is NOT SAFE to consume EDTA for more than 5 to 7 days or in doses greater than 3 grams per day. Overdosing can result in mortality, dangerously low calcium levels, and renal injury. Absorption spectrophotometry, which examines how radiation and certain light spectra are absorbed, and Ultraviolet-Visible Range spectrophotometry, which examines how certain light spectra are reflected from a given source, are the two main forms of spectrophotometry that are used.
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the molar mass of oxygen gas (o2) is 32.00 g/mol. the molar mass of c3h8 is 44.1 g/mol. what mass of o2, in grams, is required to completely react with 0.025 g c3h8? 0.018 grams 0.034 grams 0.045 grams 0.091 grams
The mass of O₂ in grams required to completely react with 0.025 g of C₃H₈ is 0.091 g.
The reaction is given as :
C₃H₈ + 5O₂ -----> 3CO₂ + 4H₂O
The mass of C₃H₈ = 0.025 g
mola mass of C₃H₈ = 44.1 g/mol
moles of C₃H₈ = mass / molar mass
= 0.025 / 44.1
= 0.00056 mol
moles of O₂ = 5 × 0.000567
= 0.00284 mol
molar mass of O₂ = 32 g/mol
mass of O₂ = moles × molar mass
= 0.00248 × 32
= 0.091 g
The mass of Oxygen required is 0.091 g to react with 0.025 g of C₃H₈ .
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which of these statements is incorrect? a. the binding forces in a molecular solid include london dispersion forces. b. ionic solids are insulators. c. all of the statements (a-d) are correct. d. molecular solids have high melting points. e. ionic solids have high melting points.
Ionic solids are therefore insulators, which is the right response. Choice "B."
Explain what an insulator is.An insulator is any substance that prevents the energy—such as electricity, heat, or cold—from the moving through it easily. Good insulators include glass, plastic, rubber, and the wood.
Which insulator is the used most frequently?The most popular and generally accessible type of insulation, blanket, comes in the form of rolls or batts. Flexible fibres, most frequently fibreglass, make up this substance. Additionally, natural fibres like cotton and sheep's wool are available in batts and rolls, along with artificial fibers and mineral wool.
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What is the amount of product obtained in a reaction known as?
Answer: Actual Yield
if 0.00849 moles of bai₂ makes 0.00283 moles of precipitate and 0.00630 moles of na₃po₄ makes 0.00315 moles of precipitate, which reactant is limiting?
In the given statement, the reactant that is limiting is BaI₂.
What is BaI₂?
BaI₂ is a chemical compound composed of barium and iodine. It is an ionic compound, meaning that the barium and iodine atoms are held together by electrostatic forces. BaI₂ is a yellow-brown colored solid at room temperature. It is used in the production of certain semiconductor materials and in medicine as a contrast agent for imaging studies.
The reactant is limiting because the amount of BaI₂ that is needed to produce the same amount of precipitate (0.00315 moles) is double the amount of Na₃PO₄ that is needed to produce the same amount of precipitate (0.00283 moles). This means that for the reaction to proceed, there must be twice as much BaI₂ as Na₃PO₄, and since there is only 0.00849 moles of BaI₂, the reaction will be limited by the amount of BaI₂ available.
What is Precipitation reaction?
A precipitation reaction is a type of chemical reaction in which two solutions are mixed together to form an insoluble salt, which is referred to as the precipitate. This type of reaction is often used to identify the presence of certain ions in solution, as the formation of a precipitate indicates that the ions in question are present.
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If exactly one molecule of solute is present in 1. 00 l of solution, what is the concentration of the solution?.
A molar solution is one that contains 1 mole of a material in 1 liter of water.
The concentration is 1.66x10-24 M if there is exactly one molecule of the solute in one litre of solution.
In this situation, 1 mole is defined as 6.02x10²³ particles, or molecules. As a conversion factor, consider the following:
1 mole = 6.02 x 10²³ molecules.
When only 1 molecule of the solute is present, use this conversion factor to determine moles of the solute:1.66x10-24 moles are equal to (1 molecule)/((1 mole)/(6.02x1023 molecules)).
Only moles remain after the molecules cancel.
By definition, concentration is the number of moles of a solute per litre. Divide the volume, in this case 1.0L, by the 1.66x10-24 moles to get:
1.66x10-24 molar, or 1.66x10-24 M, = (1.66x10-24 moles solute)/(1.0 litre).
What is the solution's concentration when 1 mole of solute dissolves in 1 liter of solution?A way to express solution concentration is by molarity. It is described as the quantity of solute that dissolves in one liter of solution.
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what is the molarity of a solution made by dissolving 25 g fe(no3)3 in enough water to make 250.0 ml of solution?
The molar concentration of a solution created by decomposing 25 g of Fe(NO₃)₃ in 250.0 ml of water is 0.413M.
How are molarities determined?We divided the number of mole of solute by both the given quantity of liters of solutions to determine the mole ratio of a solution.
What does molarity refer to?The quantity of a material in a specific volume of solution is known as its molarity (M). The number of moles of something like a solute each liter of a solution is known as molarity.
Briefing:
m= 25,
Molar mass(M) of Fe(NO₃)₃ = 241.86g/mol
V= 0.25dm3,
Molarity(C) = ?
Moles = m/M= C×V
Substitute and Simplify
m/M = C×V
25/241.86= C×0.25
Molarity(C) = 0.413M
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Warm air rises at the equator and cold air sinks at the poles creating
Responses
A hurricanes.hurricanes.
B convection currents.convection currents.
C the Coriolis effect.the Coriolis effect.
D tornadoes.
Warm air rises at the equator and cold air sinks at the poles creating is B convection currents.
What is convection currents?Convection can be described as the single or multiphase fluid flow which can take place spontaneously as a result of the combined effects of material property heterogeneity as well as the body forces on a fluid, especially with density and gravity.
It should be noted that in case whereby Warm air rises at the equator and cold, there will be a phenonmenon in which the air sinks at the poles which will bring about the convection currents.
Therefore, option B is correct.
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Pure sodium metal placed in water will spark and ignite, as well as form bubbles and gas. What are the signs that this is a chemical reaction? check all that apply.
Enter a chemical equation for HClO4(aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely. Express your answer as a chemical equation. Identify all of the phases in your answer. Enter a chemical equation for HBr(aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely.Express your answer as a chemical equation. Identify all of the phases in your answer. Enter a chemical equation for Ca(OH)2(aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely.Express your answer as a chemical equation. Identify all of the phases in your answer.
HClO₄(l) → H⁺ (aq) + ClO₄⁻ (aq) for HClO4(aq) , HBr(aq)→H+(aq)+Br−(aq) for HBr(aq) and Ca(OH)₂ → Ca²⁺ + 2OH⁻ for Ca(OH)2(aq) are the equation showing how it is an acid or a base according to Arrhenius definition.
A material is referred to as an Arrhenius acid if it contains a hydrogen atom and readily emits hydrogen ions or protons in water, in accordance with the Arrhenius theory. The quantity of replaceable hydrogen ions in an Arrhenius acid is referred to as its basicity. Chloride (Cl-) and hydronium (H3O+) ions are created when hydrochloric acid is dissolved in water.
A Lewis acid is a molecule or ion that can make a covalent bond with an electron pair or donate a proton, depending on its Brnsted-Lowry or Brnsted-Lowry acid properties. The proton donors, also referred to as Brnsted-Lowry acids, make up the first group of acids.
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The half-life of 55cr is about 2. 0 hours. The delivery of a sample of this isotope from the reactor to a certain laboratory requires 12 hours. About what mass of such material should be shipped in order that 1. 0 mg of 55cr is delivered to the laboratory?.
The half-life of 55cr is about 2. 0 hours. The delivery of a sample of this isotope from the reactor to a certain laboratory requires 12 hours. The bare minimum of such material that should be shipped is 63.9 mg= 64 mg.
Given Information: 1.8 hours is the half-life. Formula: 0.693/k is the half-life.Where: k is the rate constant.k=0.693/1.8 =0.385 hr^-1
To determine the initial concentration, use the following formula: In the A/Ao=-kt
Where: A represents the final concentration.
A o stands for initial concentration.
It is now time
Using the exponential function on both sides:
A A。 A。 -kt = e A -kt = e A = 63.9mg
The bare minimum of such material that should be shipped is 63.9 mg= 64 mg.
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