Solubility data can be used to determine which compounds will be found in aqueous and organic layers during an extraction.
Compounds that are soluble in water will be found in the aqueous layer, while compounds that are insoluble in water will be found in the organic layer. In this experiment, compounds A and B are both soluble in water, so they will be found in the aqueous layer.
Compound C is insoluble in water, so it will be found in the organic layer. Compounds D and E are both soluble in water and organic solvents, so they can be found in either layer depending on the conditions of the extraction. If the organic solvent is non-polar, such as hexane, then both compounds will be found in the organic layer. If the organic solvent is polar, such as ethyl acetate, then both compounds will be found in the aqueous layer.
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63) Give the name for PI3.A) phosphorus triiodideB) potassium triiodideC) phosphorus(III) iodideD) phosphorus(II) iodideE) phosphorus iodide
The name for PI3 is phosphorus triiodide. The correct option is A.
PI3 is a covalent compound composed of phosphorus and iodine, with the molecular formula PI3. The compound is a dark red solid with a pungent odor and is highly reactive, decomposing rapidly in water and air.
The name "phosphorus triiodide" follows the standard naming convention for covalent compounds, where the prefix "tri-" indicates that the compound contains three iodine atoms bonded to one phosphorus atom.
The prefix "phosphorus" indicates the presence of a phosphorus atom, while the suffix "-ide" indicates that iodine is in its anionic form.
It is important to note that the other options listed (potassium triiodide, phosphorus(III) iodide, phosphorus(II) iodide, and phosphorus iodide) are all valid compounds with different chemical formulas and properties.
The correct name for each of these compounds is as follows:
B) Potassium triiodide is KI3
C) Phosphorus(III) iodide is PI3
D) Phosphorus(II) iodide is not a valid compound.
E) Phosphorus iodide is not a specific compound and can refer to several different phosphorus-iodine compounds with varying formulas and properties.
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Aluminum chloride is a sold at 25'C. Is the boiling point of methan higher than 25'C, or is it lower than 25'C. How can you tell?
Methane, being a gas, would have a lower boiling point than aluminum chloride, and is likely to be in a gaseous state at room temperature.
Methane (CH4) is a simple hydrocarbon gas that is typically known to have a boiling point lower than 25°C at standard atmospheric pressure (1 atm).
Aluminum chloride (AlCl3), on the other hand, is a solid compound at 25°C. It has a high melting and boiling point, and it is typically known to be a solid at room temperature (25°C) and atmospheric pressure.
Based on these properties, we can infer that the boiling point of methane (CH4) is lower than 25°C. This is because aluminum chloride (AlCl3), which is a solid at 25°C, would not be in a liquid state at or below 25°C, and therefore cannot have a boiling point higher than 25°C.
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what does protonation of a functional group do to it (like alcohol or an oxygen)
Protonation of a functional group, like an alcohol or an oxygen, generally does the following:
1. Increases the acidity of the functional group: Protonation adds a hydrogen ion (H+) to the functional group, which increases its acidity by creating a positive charge on the molecule.
2. Makes the functional group more reactive: The addition of a hydrogen ion increases the reactivity of the functional group, making it more likely to participate in chemical reactions.
3. Changes the polarity of the functional group: Protonation affects the distribution of electron density within the functional group, altering its polarity and potentially affecting its solubility and other properties.
In summary, protonation of a functional group like alcohol or oxygen increases its acidity, reactivity, and changes its polarity.
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To get salt out of a solution (separating salt from water) we could try
Select one:
a. evaporating the water so the salt is left behind
b. drinking the water
c. melting it
d. using the solute to redissolve it
e. using a magnet
To get salt out of a solution (separating salt from water), you could try:
a. evaporating the water so the salt is left behind
This is the correct method because as the water evaporates, the salt, which does not evaporate, will be left behind as solid crystals. The other options (b, c, d, and e) are not effective methods for separating salt from water.
In order to turn seawater into freshwater you have to remove the dissolved salt in seawater. That may seem as easy as just boiling some seawater in a pan, capturing the steam and condensing it back into water (distillation).
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One amu equals 1.661 * 10^(-24) g. a.) A Mg-24 atom weighs 23.985 amu. Convert this to grams and micrograms. b.) if an atom weights 1.395 *10^(-22) g, convert this into atomic mass units (amu). c.) What would be the total mass of 10,000 atoms of 24-Mg. Answer in kg.
a) The weight of Mg-24 atom is 3.976 x 10⁻²² g or 39.76 μg, b) The weight of the given atom is 8.399 amu c) The total mass of 10,000 atoms of 24-Mg is 3.976 x 10⁻¹⁹ kg.
a) To convert the weight of Mg-24 atom from atomic mass units (amu) to grams and micrograms, we need to multiply the given weight by the conversion factor of 1.661 x 10⁻²⁴ g/amu. Therefore,
Weight in grams = 23.985 amu x 1.661 x 10⁻²⁴ g/amu = 3.976 x 10⁻²² g
Weight in micrograms = 3.976 x 10⁻²² g x 10⁶ μg/g = 39.76 μg
b) To convert the given weight of an atom in grams to atomic mass units (amu), we need to divide the weight by the conversion factor of 1.661 x 10⁻²⁴ g/amu.
Weight in amu = 1.395 x 10⁻²² g / (1.661 x 10⁻²⁴ g/amu) = 8.399 amu
c) The total mass of 10,000 atoms of 24-Mg can be calculated by multiplying the weight of one Mg-24 atom by 10,000. Therefore,
Total mass = 23.985 amu x 1.661 x 10⁻²⁴ g/amu x 10,000 = 3.976 x 10⁻¹⁹ kg.
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a chemist uses hot hydrogen gas to convert chromium(iii) oxide to pure chromium. how manymoles of hydrogen are need to convert 5 moles of chromium(iii) oxide, cr 2 o 3 ?
We would need 15 moles of H2 to react with 5 moles of Cr2O3 and convert it to pure chromium.
What is the amount of hydrogen gas, in moles?The balanced chemical equation for the reaction between chromium(III) oxide (Cr2O3) and hydrogen gas (H2) is:
Cr2O3 + 3H2 → 2Cr + 3H2O
This equation tells us that 1 mole of Cr2O3 reacts with 3 moles of H2 to produce 2 moles of Cr and 3 moles of H2O.
If we want to know how many moles of H2 are needed to react with 5 moles of Cr2O3, we can use a proportion:
1 mole Cr2O3 : 3 moles H2 = 5 moles Cr2O3 : x moles H2
Solving for x, we get:
x = (3 moles H2 / 1 mole Cr2O3) * 5 moles Cr2O3
x = 15 moles H2
So, we would need 15 moles of H2 to react with 5 moles of Cr2O3 and convert it to pure chromium.
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a ground-state h atom absorbs a photon of wavelength 91.53 nm. what higher energy level did the electron reach?
The electron reached the higher energy level of 6 after absorbing the photon of wavelength 91.53 nm.
A ground-state hydrogen atom absorbs a photon of wavelength 91.53 nm. Using the Balmer formula and Rydberg constant, we can determine the higher energy level the electron reached.
The Balmer formula is:
1/λ = R_H * (1/n1² - 1/n2²)
where λ is the wavelength (91.53 nm), R_H is the Rydberg constant for hydrogen (approximately 1.097 x 10^7 m^-1), n1 and n2 are the principal quantum numbers of the initial and final energy levels.
In the ground-state, n1 = 1, as the electron is in the first energy level. Substituting the given values, we get:
1/91.53 x 10^-9 = 1.097 x 10^7 * (1/1² - 1/n2²)
Solving for n2, we find that n2 ≈ 6.
So, the electron reached the higher energy level of 6 after absorbing the photon of wavelength 91.53 nm.
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What are the relationships between Ka, Kb, Kw, pKa , pKb, and pKw
The relationships between these values can be described by the following equations:
Ka x Kb = Kw
pKa + pKb = pKw
Ka, Kb, and Kw are all equilibrium constants that relate to the strength of acids and bases in solution.
Ka is the acid dissociation constant, which describes the extent to which an acid donates a proton (H+) in solution. It is calculated by dividing the concentration of the products of the dissociation reaction by the concentration of the acid.
Kb is the base dissociation constant, which describes the extent to which a base accepts a proton (H+) in solution. It is calculated by dividing the concentration of the products of the dissociation reaction by the concentration of the base.
Kw is the ion product constant for water, which describes the extent to which water dissociates into H+ and OH- ions in solution. It is equal to the product of the concentrations of H+ and OH- ions in solution.
pKa and pKb are logarithmic measures of the acid and base dissociation constants, respectively. They are calculated by taking the negative logarithm of the respective equilibrium constant values.
pKw is the negative logarithm of Kw, and is equal to 14 at 25°C.
The relationships between these values can be described by the following equations: Ka x Kb = Kw
pKa + pKb = pKw
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The difference in strength between LiAlH4 and NaBH4
LiAlH4 (lithium aluminum hydride) and NaBH4 (sodium borohydride) are both reducing agents commonly used in organic chemistry to reduce carbonyl compounds (such as aldehydes, ketones, and carboxylic acids) to alcohols.
The main difference in strength between these two reducing agents is related to the nature of the hydride (H-) ion that is involved in the reduction.
LiAlH4 is a stronger reducing agent than NaBH4 due to the fact that the Al-H bond is stronger and more polar than the B-H bond.
This means that LiAlH4 is a more powerful hydride donor and can reduce a wider range of functional groups than NaBH4, including esters, amides, nitriles, and even carboxylic acids.
NaBH4, on the other hand, is a milder reducing agent that is most commonly used for the reduction of aldehydes and ketones. It is less reactive than LiAlH4 because the B-H bond is weaker and less polar than the Al-H bond. As a result, NaBH4 is less likely to reduce other functional groups and is generally considered a more selective reducing agent.
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The reaction below can be identified as a _______________ reaction. 3H2 + N2 → 2NH3
An illustration of a combination reaction is the one that follows:
[tex]3H_2+N_2 - > 2NH_3[/tex].
What is Combination Reaction?When two or more compounds (reactants) combine to form a single substance (product), this is referred to as a combination reaction. This reaction also generates a large amount of energy in the form of heat in addition to the formation of new bonds and the products that arise.
Two reactants combine to produce one product in a combination reaction. Oxygen and halogens are very reactive, making them likely to mix with other elements to create new compounds. When two or more reactants combine to produce a single product, this is referred to as a combination reaction.
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_________ is exactly like SDS-PAGE, but with the addition of a reducing agent, like βmercaptoethanol, THAT WILL reduce disulfide bridges and result in a completely denatured protein.
Reducing SDS-PAGE is exactly like SDS-PAGE but with the addition of a reducing agent, like β-mercaptoethanol, that will reduce disulfide bridges and result in a completely denatured protein.
In this technique, proteins are separated based on their molecular weight. The process starts with denaturing the proteins using SDS, a detergent that binds to and unfolds the proteins.
The reducing agent, β-mercaptoethanol, is then added to the sample, which breaks the disulfide bridges holding the protein's structure together. This results in completely linear, denatured proteins. The proteins are then loaded into a polyacrylamide gel and subjected to an electric field.
As the proteins move through the gel, smaller proteins travel faster, creating a separation based on size. Reducing SDS-PAGE is useful for the accurate determination of molecular weights and analysis of protein structure.
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A buffer is prepared containing 0.800 molar acetic acid and 1.00 molar sodium acetate. What is its pH?
The pH of the buffer containing 0.800 molar acetic acid and 1.00 molar sodium acetate is approximately 4.84.
To calculate the pH of a buffer containing 0.800 M acetic acid and 1.00 M sodium acetate, you can use the Henderson-Hasselbalch equation:
pH = pKa + log10([A-]/[HA])
Here, pKa is the negative logarithm of the acid dissociation constant (Ka) for acetic acid, [A-] is the concentration of the conjugate base (acetate ion from sodium acetate), and [HA] is the concentration of the weak acid (acetic acid).
The pKa of acetic acid is approximately 4.74. Plugging the concentrations into the equation:
pH = 4.74 + log10(1.00 M / 0.800 M)
pH ≈ 4.74 + 0.1
pH ≈ 4.84
So, the pH of the buffer solution is approximately 4.84.
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How many different fin configurations are used for the B83?
The number of the different fin configurations that are used for the B83 is 10.
The B83 was the 12 feet long, that had the fins and the packed that is explosive force through the roughly 80 times greater as compared to that of the Hiroshima bomb. The job of this was to obliterate the hardened military sites and the command bunkers, that is including the Moscow's.
The Blast bombs is the light cases and the poorer penetration. The Penetration bombs is the cases that is hard enough to the penetrate concrete and the armor plating. The B83 pales as compared to others the most powerful bomb that is ever made.
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When calcium ions (Ca2+) are electrolytically reduced to calcium metal, what is the relationship between the moles of electrons transferred and the moles of Ca (s) produced?
When calcium ions (Ca2+) are electrolytically reduced to calcium metal, each calcium ion gains two electrons to form one mole of calcium metal (Ca(s)). Therefore, the relationship between the moles of electrons transferred and the moles of Ca (s) produced is a 2:1 ratio.
What happens during an electrolytic reaction?When calcium ions (Ca2+) are electrolytically reduced to calcium metal, the relationship between the moles of electrons transferred and the moles of Ca(s) produced is that 2 moles of electrons are required to produce 1 mole of calcium metal. This is because the reduction of Ca2+ to Ca(s) involves a 2-electron transfer, as represented by the following half-reaction:
Ca2+ + 2e- → Ca(s)
In this reaction, each calcium ion gains 2 electrons to become a calcium atom in the solid form. Therefore, the ratio of moles of electrons transferred to moles of Ca(s) produced is 2:1.
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The molar solubility of CuI is 2.26 × 10⁻⁶ M in pure water. Calculate the Ksp for CuI.A) 5.11 × 10⁻¹²B) 1.02 × 10⁻¹¹C) 4.52 × 10⁻⁶D) 4.62 × 10⁻¹⁷E) 1.50 × 10⁻³
The correct option is A, the Ksp for Cul is 5.11 × 10⁻¹².
CuI (s) ⇌ Cu⁺ (aq) + I⁻ (aq)
Ksp = [Cu⁺][I⁻]
Since CuI dissolves completely to form one Cu⁺ ion and one I⁻ ion, the concentration of Cu⁺ and I⁻ ions is the same as the molar solubility of CuI.
Therefore, Ksp = (2.26 × 10⁻⁶)² = 5.11 × 10⁻¹²
Ksp stands for solubility product constant and is a measure of the extent to which a solute dissolves in a solvent. It is defined as the product of the concentrations of the ions in a saturated solution of a sparingly soluble salt at a given temperature. In other words, it represents the equilibrium constant for the dissolution of a solid substance in a solvent.
Ksp is an important concept in chemistry because it helps to predict the solubility of a substance and its behavior in solution. For example, if the Ksp value for a substance is high, it means that the substance is highly soluble and will dissolve easily in a solvent. Conversely, if the Ksp value is low, the substance will be less soluble and may form a precipitate. Calculating Ksp requires knowledge of the balanced equation for the dissolution of the substance, as well as the concentrations of the ions in solution.
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sotactic poly(methyl methacrylate) has a much lower t g than the corresponding syndiotactic polymer. explain why isotactic pmma has a lower t g.
Isotactic PMMA has a lower Tg because it is strongly influenced by its stereochemical structure and the degree of order and packing of its polymer chains.
The glass transition temperature (Tg) is the temperature at which a polymer changes from a glassy state to a more rubbery state.
The Tg is influenced by the arrangement of the monomers within the polymer chains, which is referred to as tacticity.
Isotactic PMMA has a regular arrangement of the methyl groups on the same side of the polymer chain, while syndiotactic PMMA has alternating positions of the methyl groups along the chain.
The isotactic arrangement allows for closer packing of the polymer chains due to the uniformity of the side groups.
This results in stronger van der Waals forces between the chains, which allows for more efficient packing of the polymer chains.
In contrast, syndiotactic PMMA's alternating arrangement of methyl groups leads to a more irregular packing of the polymer chains.
This reduces the strength of the van der Waals forces between the chains, making the packing less efficient.
As a result, isotactic PMMA has a lower Tg than syndiotactic PMMA due to the stronger intermolecular forces and more efficient packing of the polymer chains.
This enables isotactic PMMA to become more flexible and rubbery at lower temperatures compared to its syndiotactic counterpart.
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12. Rank the following groups in order of increasing activating power in electrophilic aromatic substitution reactions:
-OCH3, -OCOCH2CH3, -CH2CH3, -Br.
The groups can be ranked in order of increasing activating power as follows: -Br < -CH2CH3 < -OCH3 < -OCOCH2CH3
The activating power of a group in electrophilic aromatic substitution reactions is determined by its ability to donate electrons to the ring. The more electron-donating the group is, the more it activates the ring towards electrophilic attack.
In this case, the bromine (-Br) group is the least activating because it is electron-withdrawing due to its high electronegativity. The ethyl (-CH2CH3) group is slightly more activating than -Br because it has some electron-donating properties. The methoxy (-OCH3) group is more activating than -CH2CH3 because it has a stronger electron-donating ability through resonance. Finally, the ester (-OCOCH2CH3) group is the most activating because it has both resonance and inductive electron-donating effects.
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47) How many moles of calcium chloride are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)2?
Reaction: 2HCl + Ca(OH)2 → 2H2O + CaCl2
A) 0.7
B) 1.0
C) 1.4
D) 1.3
E) not enough information
1.4 moles. of calcium chloride are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of [tex]Ca(OH)$_2$[/tex].option (c)
To determine the number of moles of calcium chloride [tex]CaCl$_2$[/tex] produced in the reaction, we first need to identify the limiting reactant, which we determined in the previous question to be [tex]Ca(OH)$_2$[/tex].
Using the stoichiometry of the balanced chemical equation, we can see that for every 1 mole of [tex]Ca(OH)$_2$[/tex], 1 mole of [tex]CaCl$_2$[/tex]is produced. Therefore, if 1.4 moles of [tex]Ca(OH)$_2$[/tex] is used up, then 1.4 moles of [tex]CaCl$_2$[/tex] would be produced.
Therefore, the answer is C) 1.4 moles.
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two step strategy for percent composition from experimental data
Two step strategy to determine percent composition from experimental data are to calculate the moles of each element and Calculate the percent composition.
To determine the percent composition from experimental data, we have to follow this two-step strategy:
1. Calculate the moles of each element: Divide the mass of each element obtained from the experimental data by its respective atomic weight (found on the periodic table). This will give you the moles of each element in the sample.
2. Calculate the percent composition: Divide the moles of each element by the total moles of all elements in the sample, then multiply the result by 100 to obtain the percentage. This will give you the percent composition of each element in the compound.
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asymmetrical alkyne + Hâ‚‚ (2 mol equivalent) + Pd/C
The reaction of an asymmetrical alkyne with hydrogen gas (H2) in the presence of a palladium catalyst (Pd/C) typically results in the reduction of the alkyne to an alkene.
The reaction mechanism involves the formation of a π-complex between the alkyne and Pd/C, followed by syn-addition of two hydrogen atoms across the triple bond to give a cis-alkene intermediate.
This intermediate can undergo isomerization to form a trans-alkene, or it can undergo further hydrogenation to give a saturated alkane.
If the alkyne is asymmetrical, meaning that the two substituents on the triple bond are different, then the product will be a mixture of cis- and trans-alkenes.
The ratio of these two isomers will depend on the steric and electronic effects of the substituents and the reaction conditions.
Overall, the reaction of an asymmetrical alkyne with H2 and Pd/C is a useful method for the selective reduction of alkynes to alkenes, which are versatile building blocks in organic synthesis.
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true or false Thermal energy flows into the reaction and out of the surroundings in an endothermic reaction.
True. In an endothermic reaction, thermal energy is absorbed from the surroundings and flows into the reaction, making the surroundings cooler.
How to determine the thermal energy of endothermic reaction?The thermal energy flows into the reaction and out of the surroundings in an endothermic reaction. In an endothermic reaction, energy is absorbed from the surroundings, causing the temperature of the surroundings to decrease. This energy transfer results in an increase in the internal energy of the system undergoing the reaction. This results in an increase in the internal energy of the system, which is why endothermic reactions often feel cold.
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A girl who weighs 36kg(about 80lbs) is about to go down a slide that is 1. 5m tall. How much energy is being used
The girl who weighs 36 kg is about to go down the slide that is the 1.5 m tall. The energy is being used is 529.2 kJ.
The weight of the girl = 36 kg
The height of the tall = 1.5 m
The expression for the energy is as :
Energy = m g h
Where,
The mass, m = 36 kg
The acceleration to the gravity, g = 9.8 m/s²
The height, h = 1.5 m
The energy = 36 kg × 9.8 m/s² × 1.5 m
The energy = 529.2 kJ
The energy used is 529.2 kJ, when the girl who weight is 36kg that is 80lbs and will about to go down the slide that is the 1. 5m tall.
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an increase in temperature affects the reaction rate by decreasing the velocities of particles that collide in the reaction. increasing the number of
An increase in temperature affects the reaction rate by increasing the velocities of particles that collide in the reaction, as well as increasing the number of collisions.
Here's a step-by-step methodology:
1. As temperature increases, particles gain more kinetic energy.
2. This increase in kinetic energy results in higher velocities for the particles involved in the reaction.
3. The higher velocities lead to more frequent collisions between particles.
4. More frequent collisions increase the probability of successful reactions, which in turn increases the reaction rate.
So, an increase in temperature leads to an increase in both the velocities of particles and the number of collisions, ultimately resulting in a higher reaction rate.
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Calculate the % composition of these compounds:A. Ethane (C2H6)B. Sodium hydrogen sulfate (NaHSO4)
The percentage composition of ethane is 39.99% carbon
60.01% hydrogen and that of sodium hydrogen sulfate is 19.15% sodium 0.84% hydrogen 26.71% sulfur 53.30% oxygen
A. Ethane (C2H6)
To calculate the percent composition of ethane, we need to determine the molar mass of the compound, which is the sum of the atomic masses of all the atoms in the molecule.
Molar mass of ethane = (2 × molar mass of carbon) + (6 × molar mass of hydrogen)
= (2 × 12.011 g/mol) + (6 × 1.008 g/mol)
= 30.07 g/mol
Now we can calculate the percent composition of each element in ethane:
% composition of carbon = (2 × molar mass of carbon ÷ molar mass of ethane) × 100%
= (2 × 12.011 g/mol ÷ 30.07 g/mol) × 100%
= 39.99%
% composition of hydrogen = (6 × molar mass of hydrogen ÷ molar mass of ethane) × 100%
= (6 × 1.008 g/mol ÷ 30.07 g/mol) × 100%
= 60.01%
Therefore, the percent composition of ethane is:
39.99% carbon
60.01% hydrogen
B. Sodium hydrogen sulfate (NaHSO4)
To calculate the percent composition of sodium hydrogen sulfate, we need to determine the molar mass of the compound.
Molar mass of NaHSO4 = molar mass of Na + molar mass of H + molar mass of S + 4 × molar mass of O
= 22.99 g/mol + 1.008 g/mol + 32.06 g/mol + 4 × 16.00 g/mol
= 120.06 g/mol
Now we can calculate the percent composition of each element in sodium hydrogen sulfate:
% composition of sodium = (molar mass of Na ÷ molar mass of NaHSO4) × 100%
= (22.99 g/mol ÷ 120.06 g/mol) × 100%
= 19.15%
% composition of hydrogen = (molar mass of H ÷ molar mass of NaHSO4) × 100%
= (1.008 g/mol ÷ 120.06 g/mol) × 100%
= 0.84%
% composition of sulfur = (molar mass of S ÷ molar mass of NaHSO4) × 100%
= (32.06 g/mol ÷ 120.06 g/mol) × 100%
= 26.71%
% composition of oxygen = (4 × molar mass of O ÷ molar mass of NaHSO4) × 100%
= (4 × 16.00 g/mol ÷ 120.06 g/mol) × 100%
= 53.30%
Therefore, the percent composition of sodium hydrogen sulfate is:
19.15% sodium
0.84% hydrogen
26.71% sulfur
53.30% oxygen
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why does a hydrophobic residue on the exterior of a protein require decreased entropy?
A hydrophobic residue on the exterior of a protein require decreased entropy so as to enable diffusion.
Diffusion is defined as the process of movement of molecules such as proteins which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.
There are 2 main types of diffusion:
1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.
2) facilitated diffusion- It is a passive movement of molecules across cell membrane from higher concentration region to lower concentration.
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What is the conjugate base of H2PO4− ?A) HPO42-B) PO43- C) H3PO4D) H3O+ E) OH−
The conjugate base of H2PO4− is HPO42-. The answer is option A)
The conjugate base of an acid is the species formed after the acid donates a proton (H+). In other words, the conjugate base is the particle that remains after the acid has lost a proton.
In this case, H2PO4- is acid and it can donate one proton to form its conjugate base. When H2PO4- loses one proton, it becomes HPO42- which is its conjugate base.
Therefore, HPO42- is the answer.
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a sample of gas starts at 1.00 atm, 0.00 degrees celsius, and 30.0 ml. what is the volume if the temperature increases to 127 degrees celsius and the pressure decreases to 0.500 atm?
If the temperature increases to 127 degrees celsius and the pressure decreases to 0.500 atm, the final volume of the gas is approximately 66.1 mL
We will use the combined gas law, which is:
P[tex]_{1}[/tex] * V[tex]_{1}[/tex] / T[tex]_{1}[/tex] = P[tex]^{2}[/tex] * V[tex]^{2}[/tex] / T[tex]^{2}[/tex]
Where P[tex]_{1}[/tex] is the initial pressure (1.00 atm), V[tex]_{1}[/tex] is the initial volume (30.0 mL), T[tex]_{1}[/tex] is the initial temperature (0.00°C), P[tex]^{2}[/tex] is the final pressure (0.500 atm), V[tex]^{2}[/tex] is the final volume (which we want to find), and T[tex]^{2}[/tex] is the final temperature (127°C).
First, we need to convert the temperatures from Celsius to Kelvin:
T[tex]_{1}[/tex] = 0.00°C + 273.15 = 273.15 K
T[tex]^{2}[/tex] = 127°C + 273.15 = 400.15 K
Now, plug in the values into the combined gas law equation:
(1.00 atm) * (30.0 mL) / (273.15 K) = (0.500 atm) * V[tex]^{2}[/tex] / (400.15 K)
Next, solve for V[tex]^{2}[/tex]:
V[tex]^{2}[/tex] = (0.500 atm) * (30.0 mL) * (400.15 K) / (1.00 atm * 273.15 K)
V[tex]^{2}[/tex] ≈ 66.1 mL
So, the final volume of the gas is approximately 66.1 mL when the temperature increases to 127°C and the pressure decreases to 0.500 atm.
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Determine the length of the object below with accuracy and to the correct degree of precision.
Use this media to help you complete the question.
12.48 cm
12.5 cm
12.10 cm
12 cm
The length of the object below with accuracy and to the correct degree of precision is 12.5 cm. So, the correct answer is B).
The scale shows a reading that falls between the mark of 12 cm and its adjacent division. As each unit on the scale is equal to 1 mm, the length between two sub units is equal to 0.5 mm.
Therefore, since the scale reading falls somewhere between 1 mm unit of length, it can be taken as half of it, which is 0.05 mm. Thus, the total length of the object is 12.5 cm or 12.05 mm.
This calculation demonstrates the importance of precision in measurements and the need to take into account the scale's increments to ensure accurate results. So, the correct option is B).
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--The given question is incomplete, the complete question is given
" Determine the length of the object below with accuracy and to the correct degree of precision.
Use this media to help you complete the question.
12.48 cm
12.5 cm
12.10 cm
12 cm "--
the boiling point of liquid hydrogen is 20.3 k at atm- 10.3 thermal expansion of solids and liquids spheric pressure. what is this temperature on (a) the celsius scale and (b) the fahrenheit scale?
The boiling point of liquid hydrogen is (a) -252.85°C on the Celsius scale and (b) -423.13°F on the Fahrenheit scale.
To convert the boiling point of liquid hydrogen, which is 20.3 K, to (a) the Celsius scale and (b) the Fahrenheit scale, follow these steps:
(a) Celsius scale:
1. Subtract 273.15 from the Kelvin temperature.
2. The result is the temperature in Celsius.
20.3 K - 273.15 = -252.85°C
(b) Fahrenheit scale:
1. Convert the Celsius temperature to Fahrenheit using the formula: F = (C × 9/5) + 32
2. The result is the temperature in Fahrenheit.
-252.85°C × 9/5 + 32 = -423.13°F
In conclusion, the boiling point of liquid hydrogen is (a) -252.85°C on the Celsius scale and (b) -423.13°F on the Fahrenheit scale.
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The luminosity (or wattage) of a heated, opaque, object emitting continuous radiation (perfect "black body" like a star) depends on only which two quantities?
a. The temperature and radius of the object
b. The temperature and mass of the object
c. The temperature and colors of the object
The correct option is a. The temperature and radius of the object.
The luminosity (or wattage) of a heated, opaque, object emitting continuous radiation (perfect ""black body"" like a star) is determined solely by its temperature and radius, according to the Stefan-Boltzmann Law. This law states that the energy radiated by a black body is proportional to the fourth power of its absolute temperature (in Kelvin) and its surface area. Specifically, the luminosity is proportional to the fourth power of the temperature multiplied by the surface area of the object.
Mass and color do not directly determine the luminosity of a black body. However, the temperature and radius of the object can indirectly affect its color, as hotter objects tend to emit bluer light while cooler objects tend to emit redder light.
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