Answer: The given compound is 1-butene.
Explanation:
In simple hydrocarbons, if there are only single bonds present then the suffix "ane" is added to the name of hydrocarbon.
If there is a double bond then suffix "ene" is added to the name.
If there is a triple bond then suffix "yne" is added to the name.
For example, [tex]CH_{2}=CH_{2}-CH_{2}-CH_{3}[/tex] has one double bond which is at position 1 and there are four carbon atoms present.
Hence, name of this compound is 1-butene.
Answer:
1-butene is the correct answer(:
Explanation:
Which of the following are greenhouse gases? Select all that apply. Oxygen, carbon dioxide, nitrous oxide, nitrogen
Answer:The green house gases are: carbon dioxide, nitrous oxide
Explanation:
Green house gases are the atmospheric gases which absorbs and emit radiant energy. These gases are responsible green house effect and rise in temperature of planet earth.For example: carbon-dioxide,nitrous oxide, methane, , water vapors etc. There also man made green house gases like: chloro-fluorocarbons , hydro-fluorocarbons etc.
Which statements describe phase changes? Check all that apply.
1) Particles in a liquid need to move more slowly in order to freeze.
2) Attractive forces overcome the motion of particles when a solid sublimes.
3) Attractive forces between the particles in a liquid are broken when a liquid boils.
4) Particles in gas move fast enough to make more attractive forces when the gas condenses.
the answers are 1 & 3.
The statements that describe phase changes are particles in a liquid need to move more slowly in order to freeze and attractive forces between the particles in a liquid are broken when a liquid boils.
For better understanding let's explain what it means
A phase change is simply known as a physical process. This is where a substance undergoes one phase to another and the change happens only by addition or removal of heat at a known temperature of the substance. Heat removal from a substance alters (change) a gas to a liquid or vice versa.From the above we can therefore say that the answer The statements that describe phase changes are particles in a liquid need to move more slowly in order to freeze and attractive forces between the particles in a liquid are broken when a liquid boils, is correct
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The correct statements about phase changes are Option 1 & 3 : particles in a liquid need to move more slowly to freeze, and attractive forces between particles in a liquid are broken when the liquid boils.
Phase changes refer to the transformation of a substance from one state of matter to another: solid, liquid, or gas. Let's examine the given statements:
Particles in a liquid need to move more slowly in order to freeze: This is correct. Freezing involves the removal of energy, causing particles to slow down and align into a solid structure.Attractive forces overcome the motion of particles when a solid sublimes: This is incorrect. Sublimation involves a solid changing directly to a gas, which requires the addition of energy to overcome attractive forces, not enhance them.Attractive forces between the particles in a liquid are broken when a liquid boils: This is correct. Boiling requires energy to overcome the intermolecular forces, allowing particles to move freely as a gas.Particles in gas move fast enough to make more attractive forces when the gas condenses: This is incorrect. Condensation involves gas particles losing energy and forming stronger attractive forces as they transition to a liquid state.Based on the explanation, the correct statements are 1 and 3.
Which best describes the heat that you can feel on the engine of a running car?
The heat is unusable and absorbed by the engine.
The heat is usable and absorbed by the engine.
The heat is unusable and lost to the surroundings.
The heat is usable and lost to the surroundin
please help
Answer is: The heat is unusable and lost to the surroundings.
Gasoline is a mixture of many different hydrocarbons: alkanes (paraffins), cycloalkanes and alkenes (olefins).
Balanced chemical reaction of gasoline combustion:
C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O + energy.
One part of energy produced in combustion of gasoline is used for car ungine (kinetic energy) and other part of that energy (in form of heat) is lost to the surronding and engine does not use it.
Experimental data have shown that the rate law for the reaction 2 hgcl2(aq) + c2o4 2 -(aq) → 2 cl-(aq) + 2 co2 (g) + hg2cl2 (s) is: rate = k[hgcl2][c2o4 2 -]2 how will the rate of reaction change if the concentration of c2o4 2 - is tripled and the concentration of hgcl2 is doubled?
Answer:
The rate will be doubled by a Factor of 18
Explanation:
Good luck to everyone doing this!! you got this
The rate of the reaction will increase by a factor of 18 if the concentration of C2O42- is tripled and the concentration of HgCl2 is doubled.
Explanation:The question asks how the rate of the reaction 2 HgCl2(aq) + C2O42-(aq) → 2 Cl-(aq) + 2 CO2 (g) + Hg2Cl2 (s) will change if the concentration of C2O42- is tripled and the concentration of HgCl2 is doubled. Given the rate law rate = k[HgCl2][C2O42-]2, we can predict the effect on the rate. If the rate law is followed, tripling [C2O42-] will increase the rate by a factor of 32 or 9 because the concentration of C2O42- is squared in the rate law. Doubling [HgCl2] will double the rate of reaction. Therefore, tripling [C2O42-] and doubling [HgCl2] together will increase the reaction rate by a factor of 2 * 9 = 18.
Draw structural formulas for the alkoxide ion and the alkyl(aryl)bromide that may be used in a williamson synthesis of the ether shown.
The alkoxide ion (RO⁻) and the alkyl(aryl) bromide can be used in a Williamson ether synthesis to create ethers. The structural formulas of these compounds depend on the specific alkyl or aryl group involved in the synthesis.
In a Williamson ether synthesis, an alkoxide ion reacts with an alkyl (or aryl) halide to form an ether. To perform this synthesis, let's consider the given ether and determine the structural formulas for the alkoxide ion and the alkyl(aryl)bromide.
Given Ether:
The given ether is not explicitly mentioned in your question. To proceed, let's assume the ether you intend to synthesize has the following structure:
R-O-R
where "R" represents an alkyl or aryl group. This is a general representation for ethers.
Structural Formulas:
1. Alkoxide Ion (RO⁻):
- The alkoxide ion (RO⁻) is formed by removing a hydrogen atom from an alcohol (R-OH). It has a lone pair of electrons on the oxygen atom. The structural formula is as follows:
RO⁻
|
R
2. Alkyl (Aryl) Bromide:
- The alkyl bromide or aryl bromide can be represented as "R-Br" or "Ar-Br," where "R" represents an alkyl group, and "Ar" represents an aryl group. The structural formula depends on the specific alkyl or aryl group you are using.
Example 1 (Alkyl Bromide):
- For an alkyl bromide, if we use "R" as a general alkyl group, the structural formula is:
R-Br
Example 2 (Aryl Bromide):
- For an aryl bromide, if we use "Ar" as a general aryl group, the structural formula is:
Ar-Br
In a Williamson ether synthesis, the alkoxide ion (RO⁻) is a strong nucleophile that attacks the alkyl (aryl) halide, leading to the formation of the desired ether by replacing the halogen atom. The specific alkyl or aryl group used will depend on the reactants and the ether you intend to synthesize.
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What does R stand for in ideal gas law?
In the Ideal Gas law, the letter R represents the universal gas constant. Its value depends on the units being used for pressure, volume, moles, and temperature. The ideal gas law equation is PV=nRT.
Explanation:In the Ideal Gas law, the letter R stands for the universal gas constant. This constant is derived from the Ideal Gas Equation: R = 0.08206 L atm mol-¹ K-¹ or 8.314 L kPa mol-¹ K-¹. The ideal gas law itself is represented as PV = nRT, where P represents pressure, V is volume, n is the number of moles of the gas, T is temperature in Kelvin, and R is the universal gas constant.
The value of R, 0.08206 L atm mol-¹ K-¹ or 8.314 J/mol · K, depends on the units being used. For instance, when using SI units, R would be 8.31 J/mol · K.
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write the balanced equation for: Aqueous solutions of phosphoric acid and cesium hydroxide react to produce aqueous cesium dihydrogen phosphate and liquid water
The balanced chemical equation for the reaction between phosphoric acid and cesium hydroxide to produce cesium dihydrogen phosphate and water is 3 CsOH(aq) + H3PO4(aq) → Cs3PO4(aq) + 3 H2O(l).
Explanation:The balanced chemical equation for the reaction between aqueous solutions of phosphoric acid (H3PO4) and cesium hydroxide (CsOH) to produce aqueous cesium dihydrogen phosphate (CsH2PO4) and liquid water (H2O) is as follows:
3 CsOH(aq) + H3PO4(aq) → Cs3PO4(aq) + 3 H2O(l)
This reaction is an example of an acid-base neutralization, resulting in the formation of a salt (cesium dihydrogen phosphate) and water.
What molality of a nonvolatile, nonelectrolyte solute is needed to raise the boiling point of water by 8.00°C (Kb = 0.520°C/m)?
Seafloor spreading provides evidence of which of the following Earth processes?
A.erosion of coastlines
B.weathering of mountains
C.movement of crustal plates
D.formation of sedimentary rocks
Seafloor spreading provides evidence for D. formation of sedimentary rocks.
Seafloor spreading occurs when there's volcanic activity that leads to the formation of a new oceanic crust. Sedimentary rocks refer to the rocks that are formed when there's an accumulation of organic particles or minerals on the surface of the Earth.It should be noted that sedimentary rocks are deposited in layers that are referred to as strata. Examples of sedimentary rocks include limestones, iron ore, chert, etc.In conclusion, when seafloor spreading occurs, there are sediments that overtime accumulates and forms sedimentary rock.
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Astrology is the study of the Earth, Moon, and Stars in space. Please select the best answer from the choices provided
T
F
The answer would be false because the true answer would be astronomy
Identify the housing option that has the lowest maintenance cost a single-family home b condominium c mobile home or d apartment
Answer:c mobile home
Explanation:
A mobile home is preconstructed structure, that can be run and transported to other location according to the choice of living place. This can be prepared from wood or other kind of cheap material which can keep the weight of mobile home low.
Thus mobile home is the lowest maintainace cost home for a single family.
Which is more stable hydroxyl isopropyl or benzhydrol radical?
The benzhydrol radical is more stable than the hydroxyl isopropyl radical because it can delocalize its unpaired electron through resonance across the aromatic ring, while the hydroxyl isopropyl radical lacks such extensive resonance stabilization.
When considering the stability of hydroxyl isopropyl and benzhydrol radicals, it's important to look at resonance stabilization. Radicals that can delocalize their unpaired electron through resonance are generally more stable. In the case of a benzhydrol radical, also known as a benzylic radical, there is significant stabilization due to the possibility of multiple resonance structures. This is because the unpaired electron in the benzhydrol radical can be delocalized through the aromatic ring's system of conjugated pi bonds.
On the other hand, the hydroxyl isopropyl radical, which is an alkyl radical, lacks the extended conjugated system that allows for such delocalization. While it may have some hyperconjugative stabilization, it does not benefit from the extensive resonance stabilization that the benzhydrol radical enjoys. As such, the benzhydrol radical is more stable than the hydroxyl isopropyl radical due to the resonance effects and the subsequent delocalization of the unpaired electron across the aromatic ring.
A mysterious white powder could be powdered sugar (C12H22O11), cocaine (C17H21NO4), codeine (C18H21NO3), norfenefrine (C8H11NO2), or fructose (C6H12O6). When 82 mg of the powder is dissolved in 1.50 mL of ethanol (d = 0.789 g/cm3, normal freezing point −114.6 ∘C, Kf = 1.99 ∘C/m), the freezing point is lowered to −115.5 ∘C. What is the identity of the white powder?
Norfenefrine (C₈H₁₁NO₂).
Further explanationWe will solve a case related to one of the colligative properties, namely freezing point depression.
The freezing point of the solution is the temperature at which the solution begins to freeze. The difference between the freezing point of the solvent and the freezing point of the solution is called freezing point depression.
[tex]\boxed{ \ \Delta T_f = T_f(solvent) - T_f(solution) \ } \rightarrow \boxed{ \ \Delta T_f = K_f \times molality \ }[/tex]
Given:
A mysterious white powder could be,
powdered sugar (C₁₂H₂₂O₁₁) with a molar mass of 342.30 g/moles, cocaine (C₁₇H₂₁NO₄) with a molar mass of 303.35 g/moles, codeine (C₁₈H₂₁NO₃) with a molar mass of 299.36 g/moles, norfenefrine (C₈H₁₁NO₂) with a molar mass of 153.18 g/moles, or fructose (C₆H₁₂O₆) with a molar mass of 180.16 g/moles.When 82 mg of the powder is dissolved in 1.50 mL of ethanol (density = 0.789 g/cm³, normal freezing point −114.6°C, Kf = 1.99°C/m), the freezing point is lowered to −115.5°C.
Question: What is the identity of the white powder?
The Process:
Let us identify the solute, the solvent, initial, and final temperatures.
The solute = the powderThe solvent = ethanolThe freezing point of the solvent = −114.6°CThe freezing point of the solution = −115.5°CPrepare masses of solutes and solvents.
Mass of solute = 82 mg = 0.082 gMass of solvent = density x volume, i.e., [tex]\boxed{ \ 0.789 \ \frac{g}{cm^3} \times 1.50 \ cm^3 = 1.1835 \ g = 0.00118 \ kg \ }[/tex]We must prepare the solvent mass unit in kg because the unit of molality is the mole of the solute divided by the mass of the solvent in kg.
The molality formula is as follows:
[tex]\boxed{ \ m = \frac{moles \ of \ solute}{kg \ of \ solvent} \ } \rightarrow \boxed{ \ m = \frac{mass \ of \ solute \ (g)}{molar \ mass \ of \ solute \times kg \ of \ solvent} \ }[/tex]
Now we combine it with the formula of freezing point depression.
[tex]\boxed{ \ \Delta T_f = K_f \times \frac{mass \ of \ solute \ (g)}{molar \ mass \ of \ solute \times kg \ of \ solvent} \ }[/tex]
It is clear that we will determine the molar mass of the solute (denoted by Mr).
We enter all data into the formula.
[tex]\boxed{ \ -114.6^0C - (-115.5^0C) = 1.99 \frac{^0C}{m} \times \frac{0.082 \ g}{Mr \times 0.00118 \ kg} \ }[/tex]
[tex]\boxed{ \ 0.9 = \frac{1.99 \times 0.082}{Mr \times 0.00118} \ }[/tex]
[tex]\boxed{ \ Mr = \frac{0.16318}{0.9 \times 0.00118} \ }[/tex]
We get [tex]\boxed{ \ Mr = 153.65 \ }[/tex]
These results are very close to the molar mass of norfenefrine which is 153.18 g/mol. Thus the white powder is norfenefrine.
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The identity of the white powder is [tex]\boxed{\text{norfenefrine}(\text{C}_{8}\text{H}_{11}\text{NO}_{2})}[/tex] .
Further Explanation:
Colligative properties
These are the properties that depend on the number of solute particles and not on their mass or identities. Following are the four colligative properties:
1. Relative lowering of vapor pressure
2. Elevation in boiling point
3. Depression in freezing point
4. Osmotic pressure
The temperature where a substance in its liquid form is converted into the solid state is known as freezing point. Freezing point depression is a colligative property because it depends on the number of moles of solute particles.
The expression for the freezing point depression is as follows:
[tex]\Delta\text{T}_\text{f}=\text{K}_\text{f}\,\text{m}[/tex] …… (1)
Here,
[tex]\Delta\text{T}_\text{f}[/tex] is the depression in freezing point.
[tex]\text{K}_\text{f}[/tex] is the cryoscopic constant.
m is the molality of the solution.
The formula to calculate the density of substance is as follows:
[tex]\text{Density of substance}=\dfrac{\text{Mass of substance}}{\text{Volume of substance}}[/tex] …… (2)
Rearrange equation (2) for the mass of substance.
[tex]\text{Mass of substance}=(\text{Density of substance })(\text{Volume of substance})[/tex] …… (3)
The volume of the substance is to be converted into . The conversion factor for this is,
[tex]1\,\text{ml}=1\,\text{cm}^3[/tex]
Therefore the volume of the substance can be calculated as follows:
[tex]\begin{aligned}\text{Volume}&=(1.50\,\text{mL})\left(\frac{1\,\text{cm}^3}{1\,\text{mL}}\right)\\&=1.50\,\text{cm}^3\end{aligned}[/tex]
Substitute [tex]1.50\,\text{cm}^3[/tex] for the volume of substance and [tex]0.789\,\text{g/gm}^3[/tex] for the density of the substance in equation (3) to calculate the mass of solvent.
[tex]\begin{aligned}\text{Mass of solvent}&=\left(\dfrac{0.789\,\text{g}}{1\,\text{cm}^3}\right)(1.50\,\text{cm}^3)\\&=1.1835\,\text{g}\end{aligned}[/tex]
This mass is to be converted into kg. The conversion factor for this is,
[tex]1\,\text{g}=10^{-3}\,\text{kg}[/tex]
Therefore the mass of solvent can be calculated as follows:
[tex]\begin{aligned}\text{Mass of solvent}&=(1.1835\,\text{g})\left(\dfrac{10^{-3}\,\text{kg}}{1\,\text{g}}\right)\\&=0.0011835\,\text{kg}\end{aligned}[/tex]
The mass of solute is to be converted into g. The conversion factor for this is,
[tex]1\,\text{mg}=10^{-3}\,\text{g}[/tex]
Therefore the mass of solute can be calculated as follows:
[tex]\begin{aligned}\text{Mass of solute}&=(82\,\text{mg})\left(\dfrac{10^{-3}\,\text{g}}{1\,\text{g}}\right)\\&=0.082\,\text{g}\end{aligned}[/tex]
The freezing point depression can be calculated as follows:
[tex]\begin{aligned}\Delta\text{T}_\text{f}&=-114.6\,^\circ\text{C}-(-115.5\,^\circ\text{C})\\&=0.9\,\circ\text{C}\end{aligned}[/tex]
The formula to calculate the molality of solution is as follows:
[tex]\text{Molality of solution}=\dfrac{\text{Amount (mol) of solute}}{\text{Mass (kg) of solvent}}[/tex] …… (4)
The formula to calculate the amount of solute is as follows:
[tex]\text{Amount of solute}=\dfrac{\text{Mass of solute}}{\text{Molar mass of solute}}[/tex] …… (5)
Incorporating equation (5) into equation (4),
[tex]\text{Molality of solution}=\dfrac{\text{Mass of solute}}{(\text{Mass of solvent})(\text{Molar mass of solute})}[/tex] …… (6)
Incorporating equation (6) into equation (1),
[tex]\Delta\text{T}_\text{f}=\text{k}_\text{f}\left(\dfrac{\text{Mass of solute}}{(\text{Mass of solvent})(\text{Molar mass of solute})}\right)[/tex] …… (7)
Rearrange equation (7) to calculate the molar mass of solute.
[tex]\text{Molar mass of solute}=\dfrac{\text{k}_\text{f}}{\Delta\text{T}_\text{f}}\left(\dfrac{\text{Mass of solute}}{\text{Mass of solvent}}\right)[/tex] …… (8)
Substitute [tex]1.99\,^\circ\text{C/m}[/tex] for [tex]\text{k}_\text{f}[/tex], [tex]0.9\,^\circ\text{C}[/tex] for [tex]\Delta\text{T}_\text{f}[/tex], 0.082 g for the mass of solute and 0.0011835 kg for the mass of solvent in equation (8).
[tex]\begin{aligned}\text{Molar mass of solute}&=\left(\dfrac{1.99}{0.9}\right)\left(\dfrac{0.082}{0.0011835}\right)\\&=153.199\,\text{g/mol}\\&=\approx153.2\,\text{g/mol}\end{aligned}[/tex]
The molar mass of powdered sugar is 342.3 g/mol.
The molar mass of cocaine is 303.4 g/mol.
The molar mass of codeine is 299.4 g/mol.
The molar mass of norfenefrine is 153.2 g/mol.
The molar mass of fructose is 180.2 g/mol.
The calculated molar mass of solute is similar to that of norfenefrine. So the identity of the white powder is norfenefrine.
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Grade: Senior School
Chapter: Solutions
Subject: Chemistry
Keywords: colligative properties, depression in freezing point, cryoscopic constant, freezing point, 153.199 g/mol, norfenefrine.
Why is airborne and water borne chemicals both local and global issues
What are the dissolved particles in a solution containing a molecular solute? what are the dissolved particles in a solution containing a molecular solute? the atoms the cations the molecules the ions?
The dissolved particles in a solution containing a molecular solute are the molecules of the solute themselves. When a molecular solute dissolves, its molecules distribute uniformly within the solvent, forming a homogeneous mixture at the molecular level. However, ionic solutes dissociate into individual cations and anions.
Explanation:The dissolved particles in a solution containing a molecular solute like sugar (C12H22O11) would be molecules. In chemistry, a solution can be thought of as a mixture that is homogeneous at the molecular level. In these solutions, one component (the solvent) is usually present in a significantly larger concentration. Other components (solutes), are present in relatively lesser amounts. When a covalent solid like sugar dissolves in water, its molecules become uniformly distributed among the molecules of water creating an aquaeous solution.
However, not all solutions result in dissolved molecules. Solutions that include ionic compounds like sodium chloride (NaCl) will separate into individual cations and anions when dissolved in water. In contrast to molecular substances, ionic type compounds will break apart into separate ions. Hence, it's crucial to understand the type of solute in your solution.
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A cube has a mass of 100 grams and it’s density is determined to be 1g/cm^3. The volume of the cube must be
Answer:
Volume = 100 cm³
Solution:
Density measures and compares the amount of mass contained by a substance to its volume. It is expressed as,
Density = Mass / Volume
Data Given;
Density = 1.0 g/cm³
Mass = 100 g
Volume = ?
Formula Used;
Density = Mass ÷ Volume
Solving for Volume,
Volume = Mass ÷ Density
Putting values,
Volume = 100 g ÷ 1.0 g.cm⁻³
Volume = 100 cm³
You used both HNO3 and H2SO4 solutions in this experiment. briefly answer the following question.
why couldn't you substitute 3M H2SO4 for concentrated HNO3 in Part 1?
You couldn't substitute 3M H2SO4 for concentrated HNO3 in Part 1 of the experiment due to the significant differences in their reactivity and properties. HNO3 is a powerful oxidizing agent and provides specific reactions, while H2SO4 is a strong acid but not as strong an oxidizing agent.
Explanation:The reason you couldn't substitute 3M H2SO4 for concentrated HNO3 in Part 1 of the experiment is due to the difference in their reactivity and properties. Nitric Acid (HNO3) is a powerful oxidizing agent. This means it has the ability to oxidize other substances, bringing about specific chemical reactions. On the other hand, Sulfuric Acid (H2SO4), while still a strong acid, is not as strong an oxidizing agent and would not yield the same results if used as a substitute for HNO3 in this experiment.
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When bromobenzene reacts with propene in a heck reaction (in the presence of pd(php3)4 and et3n) , two constitutional isomers are obtained as the products. give the structures of the two products. interactive 3d display mode?
The Heck reaction involves bond formation between an alkene and an aryl halide. With bromobenzene and propene, two isomers can be obtained, 1-propylbenzene and 2-propylbenzene. These differ in the attachment point of the propyl group to the benzene ring.
Explanation:The Heck reaction involves a palladium-catalyzed carbon-carbon bond formation between an alkene and an aryl halide. When bromobenzene reacts with propene in a Heck reaction with pd(php3)4 and et3n, two constitutional isomers can be obtained. The difference between the two isomers would lie in the point of attachment of the propyl group to the benzene ring - it could either be at the end (1-propylbenzene) or at the middle (2-propylbenzene).
For 1-propylbenzene, the propyl group is attached to the benzene ring at one end, resulting in a straight chain configuration.
However, for 2-propylbenzene, the propyl group is attached to the benzene ring in the middle, resulting in a branched chain configuration.
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H2o is the chemical formula for water. in order to produce a single molecule of water, how many hydrogen atoms are needed?
Final answer:
To produce a single molecule of water (H₂O), exactly two hydrogen atoms are required. This 2:1 ratio of hydrogen to oxygen atoms is consistent no matter how many molecules of water are being made.
Explanation:
To produce a single molecule of water, which has the chemical formula H₂O, you need two hydrogen atoms. The subscript '2' in H₂ indicates that there are two hydrogen atoms for every oxygen atom in a water molecule. Therefore, for each molecule of water you create, you must have this 2:1 ratio of hydrogen to oxygen atoms.
For example, if you want to create two water molecules, you would need a total of 4 hydrogen atoms (2 molecules × 2 atoms/molecule). Similarly, to produce five water molecules, you would require 10 hydrogen atoms in all (5 molecules × 2 atoms/molecule). No matter the number of water molecules you are looking to produce, you will always need twice as many hydrogen atoms as you have water molecules because of this consistent ratio.
Many drugs decompose in blood by a first-order process. two tablets of aspirin supply 0.60 g of the active compound. after 30 min, this compound reaches a maximum concentration of 2 mg/100 ml of blood. if the half-life for its breakdown is 90 min, what is its concentration (in mg/100 ml) 4.0 h after it reaches its maximum concentration?
The concentration of drug after 4.5 hoursis [tex]\boxed{{\text{0}}{\text{.25 mg/100 mL}}}[/tex].
Further Explanation:
Radioactive decayis responsible to stabilizeunstable atomic nucleusaccompanied by the release of energy.
Half-life is the duration after which half of the original sample has been decayed and half is left behind. It is represented by [tex]{t_{{\text{1/2}}}}[/tex].
The relation between rate constant and half-life period for first-order reaction is as follows:
[tex]k = \dfrac{{0.693}}{{{t_{{\text{1/2}}}}}}[/tex] …… (1)
Here,
[tex]{t_{{\text{1/2}}}}[/tex] is half-life period.
k is rate constant.
Substitute 90 min for [tex]{t_{{\text{1/2}}}}[/tex] in equation (1).
[tex]\begin{aligned}k &= \frac{{0.693}}{{90{\text{ min}}}} \\&= 7.7 \times {10^{ - 3}}{\text{ mi}}{{\text{n}}^{ - 1}} \\\end{aligned}[/tex]
Radioactive decay formula is as follows:
[tex]{\text{A}} = {{\text{A}}_0}{e^{ - kt}}[/tex] …… (2)
Here
A is the concentration of sample after time t.
t is the time taken.
[tex]{{\text{A}}_0}[/tex] is the initial concentration of sample.
k is the rate constant.
The time for the process is to be converted into min. The conversion factor for this is,
[tex]1{\text{ hr}} = 60\min[/tex]
Therefore time taken can be calculated as follows:
[tex]\begin{aligned}t&= \left( {4.5{\text{ hr}}} \right)\left( {\frac{{60{\text{ min}}}}{{1{\text{ hr}}}}} \right) \\&= 270{\text{ min}} \\\end{aligned}[/tex]
Substitute 2 mg/100 mL for [tex]{{\text{A}}_0}[/tex] , [tex]7.7 \times {10^{ - 3}}{\text{ mi}}{{\text{n}}^{ - 1}}[/tex] for k and 270 min for t in equation (2).
[tex]\begin{aligned}{\text{A}} &= \left( {\frac{{2{\text{ mg}}}}{{100{\text{ mL}}}}} \right){e^{ - \left( {7.7 \times {{10}^{ - 3}}{\text{ mi}}{{\text{n}}^{ - 1}}} \right)\left( {270{\text{ min}}} \right)}} \\&= \frac{{0.25{\text{ mg}}}}{{100{\text{ mL}}}} \\\end{aligned}[/tex]
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Radioactivity
Keywords: half-life, 0.25 mg/100 mL, 2 mg/100 mL, A, k, t, rate constant, 4.5 h, 270 min, radioactive decay formula.
Identify the spectator ions for the reaction that occurs when aqueous solutions of lithium sulfide and copper(ii) nitrate are mixed.
a.cu2+ and no3-
b.li+ and cu2+
c.li+ and no3-
d.s2- and cu2+
e.no spectator ions are present.
The spectator ions for the reaction between lithium sulfide and copper nitrate are [tex]\boxed{{\text{c}}{\text{. L}}{{\text{i}}^ + }{\text{ and NO}}_3^ - }[/tex].
Further Explanation:
Spectator ions:
These are the ions that exist in the same form on both sides of the reaction. These ions do not affect the equilibrium of any reaction.
The three types of equations that are used to represent the chemical reaction are as follows:
1. Molecular equation
2. Total ionic equation
3. Net ionic equation
The reactants and products remain in undissociated form in the molecular equation. In the case of the total ionic equation, all the ions that are dissociated and present in the reaction mixture are represented while in the case of the overall or net ionic equation only the useful ions that participate in the reaction are represented.
The steps to write the net ionic reaction are as follows:
Step 1: Write the molecular equation for the reaction with the phases in the bracket.
In the reaction, [tex]{\text{L}}{{\text{i}}_2}{\text{S}}[/tex] reacts with [tex]{\text{Cu}}{\left( {{\text{N}}{{\text{O}}_3}} \right)_2}[/tex] to form CuS and [tex]{\text{LiN}}{{\text{O}}_3}[/tex]. The balanced molecular equation of the reaction is as follows:
[tex]{\text{L}}{{\text{i}}_{\text{2}}}{\text{S}}\left( {aq} \right) + {\text{Cu}}{\left( {{\text{N}}{{\text{O}}_3}} \right)_2}\left( {aq} \right) \to {\text{CuS}}\left( s \right) + 2{\text{LiN}}{{\text{O}}_3}\left( {aq} \right)[/tex]
Step 2: Dissociate all the compounds with the aqueous phase to write the total ionic equation. The compounds with solid and liquid phases remain the same. The total ionic equation is as follows:
[tex]2{\text{L}}{{\text{i}}^ + }\left( {aq} \right) + {{\text{S}}^{2-}}\left({aq}\right)+{\text{C}}{{\text{u}}^{2+}}\left( {aq} \right) + 2{\text{NO}}_3^-\left({aq}\right)\to {\text{CuS}}\left(s\right)+2{\text{L}}{{\text{i}}^+}\left({aq}\right)+2{\text{NO}}_3^-\left( {aq}\right)[/tex]
Step 3: The common or spectator ions on both sides of the reaction get cancelled out to get the net ionic equation.
[tex]\boxed{2{\text{L}}{{\text{i}}^ + }\left( {aq} \right)} + {{\text{S}}^{2 - }}\left( {aq} \right) + {\text{C}}{{\text{u}}^{2 + }}\left( {aq} \right) + \boxed{2{\text{NO}}_3^ - \left( {aq} \right)} \to {\text{CuS}}\left( s \right) + \boxed{2{\text{L}}{{\text{i}}^ + }\left( {aq} \right)} + \boxed{2{\text{NO}}_3^ - \left( {aq} \right)}[/tex]
[tex]{\text{L}}{{\text{i}}^ + }[/tex] and [tex]{\text{NO}}_3^ -[/tex] ions are present in the same form on both the reactant and the product side and therefore are known as spectator ions.
Therefore, the net ionic equation is as follows:
[tex]{{\text{S}}^{2 - }}\left( {aq} \right) + {\text{C}}{{\text{u}}^{2 + }}\left( {aq} \right) \to {\text{CuS}}\left( s \right)[/tex]
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Answer details:
Grade: High School
Subject: Chemistry
Chapter: Chemical reaction and equation
Keywords: net ionic equation, spectator ions, CuS, Cu2+, Li+, NO3-, S2-, 2 Li+, 2 NO3-.
N a 3 P O 4 (aq)+L i 2 S O 4 (aq)→ Express your answer as a chemical equation. Enter NOREACTION if no reaction occurs. Identify all of the phases in your answer.
using the equation 2H2+O2-->2H2O if 19g of oxygen reacts completely, how many grams of hydrogen must react with it
Answer: 2.4 grams
Explanation:
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
For [tex]O_2[/tex]
Given mass = 19 g
Molar mass of [tex]O_2[/tex] = 32 g/mol
Putting values in above equation, we get:
[tex]\text{Moles of}O_2=\frac{19}{32}=0.60moles[/tex]
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
1 mole of [tex]O_2[/tex] reacts with 2 moles of [tex]H_2[/tex]
0.60 moles of [tex]O_2[/tex] wil react with =[tex]\frac{2}{1}\times 0.60=1.20[/tex] moles of [tex]H_2[/tex]
mass of [tex]H_2=moles\times {\text {molar mass}}=1.20moles\times 2g/mol=2.4g[/tex]
Thus 2.4 grams of hydrogen will react completely with 19 g of oxygen.
What is the mass of 1 mole of Pb?
Answer:
207.2 g
Explanation:
The mass of 1 mole of lead is given by its molar mass, which is 207.2 g/mol. This is an average molar mass, corresponding to the weighted average of the 4 lead isotopes, ²⁰⁴Pb, ²⁰⁶Pb, ²⁰⁷Pb, ²⁰⁸Pb, considering their abundance in nature. The mass of 1 mole of Pb is:
1 mol × (207.2 g/mol) = 207.2 g
Which of the following could be classified as matter? Check all of the boxes that apply. desk water idea cloud helium dream
Examples of matter include;
DeskWaterCloudHeliumFurther ExplanationMatter Matter is anything that has weight and occupies space. Matter exists in three states, liquid, gases, and solids.For example, from the examples above; helium is matter in a gaseous state, water in liquid state and desk in solid-state.Matter is made up of small particles that are in continuous random movement.Particles A particle refers to a single atom or a group of atoms that are bonded together and functions as a single unit. Therefore, matter is made up of particles that can either be single atoms or chemically bonded atoms to make a molecule. Hence, a molecule is also a particle of matter.An atom An atom is the smallest particle of an element that can take part in a chemical reaction.Atoms are made up of sub-atomic particles which include; protons, neutrons, and electrons. When two or more atoms are bonded together they form a molecule.Molecule A molecule is the smallest particle of an element or a compound that has similar properties of that particular compound or element.Molecules could be made up of atoms that are similar such as oxygen molecules or atoms that different from different elements, such as water molecules.The bonding of atoms to form molecules occurs as a result of the sharing or transfer of electrons between atoms.Keywords: Matter, states of matter, particles, atoms, molecules, elements, compounds
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Subject: Chemistry
Topic: Matter and particles of matter
Sub-topic: Classification of matter
How did convection currents cause the plates to move
Write all the species that are present in a phosphoric acid solution. in
Which of these carbohydrates is a monosaccharide maltose fructose cellulose or lactose
Use the periodic table in the tools bar to complete the electron configurations for the following elements: Lithium (Li): 1sA2sB
Answer: Value of A is 2 and value of B is 1.
Explanation:
Lithium is the third element of the periodic table. It belongs to the Period 2 and Group 1 and is considered as an alkali metals.
To write the electronic configuration, we need to find the number of electrons this element contain, which is equal to the atomic number.
Number of electrons = Atomic number = 3
So, the electronic configuration will be: [tex]1s^22s^1[/tex]
The s-orbital in total can contain only 2 electrons.
Hence, the value of A is 2 and value of B is 1.
The periodic table showcases the table of the chemical elements listed in order of atomic number, usually in rows(period) from the left to the right, in such a way that elements with similar atomic structures as well as similar chemical properties can be located in vertical columns (groups).
Lithium is the third chemical element on the periodic table. It can be located on group 1 element also known as the alkali metals. It is soft in nature and has a whitish color.
The electronic configuration explains how electrons are distributed in their atomic orbitals.
The electronic configuration for Lithium can be expressed as:
Li: 1s² 2s¹
Therefore, from the given information, we can conclude that the value for the electronic configuration of A and B in the Lithium sample given is 2 and 1 respectively
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What is the partial pressure of argon, par, in the flask? express your answer to three significant figures and include the appropriate unit?