The heat that released from a combustion reaction of C₆H₆ when 13.5 grams of h20 product are created is -1588.7 KJ/mole
Heat is produced when kinetic energy moves within a material or an object, or when kinetic energy moves from an energy source to a material or an object. Such energy can be transported using three different mechanisms: radiation, conduction, and convection.
Heat energy is created by the movement of tiny atoms, molecules, or ions in solids, liquids, and gases. It is possible to transfer heat energy from one thing to another. Heat is a flow or transfer that happens when two objects have different temperatures from one another.
2C₆H₆ + 15O₂ → 12CO₂ + 6H₂O
2x49.04 2x10 12x-393.5 6x-285.8
= [ 12(-393.5 )+6(-285.8) ] - [ 2(49.04)+(2x10) ]
= - 6936.8 - 98
= - 6534.8 KJ/mole
we have 13.5 gram of water produce so,
moles water = mass/ mass molar = 13.5 g/ 18 g/moles = 0.75 moles
with unitary method we can find the moles of benzene
mole benzene = 2/6 x 0.75 = 0.25 moles
so the heat release of 0.25 moles of benzene is
= - 6534.8 KJ/mole x 0.25 moles = -1588.7 KJ/mole
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why water boiling is not a chemical reaction, even though it releases a gas. Use the words chemical bond in your answer.
Water boiling is not a chemical reaction because it does not involve a chemical bond being broken or formed. During boiling, the water molecules absorb heat energy and gain enough kinetic energy to escape into the air as a gas, in the form of water vapor. This process is known as a physical change because it does not alter the chemical makeup of the water molecules, it only changes their physical state from liquid to gas.
The ambiguous name dimethylcyclopentene does not clearly distinguish between several structures.
A) Draw the structures of all constitutional isomers corresponding to this name.
B) Indicate which of these is likely to be the most stable i.e., have the smallest heat of combustion, justifying your rationale breifly.
C) Which of these structures represents an achiral molecule?
The linear dimethylpentene represents an achiral molecule, as it does not have a center of chirality.The cyclic dimethylpentene is likely to be the most stable isomer.
A) There are two constitutional isomers that correspond to the name dimethylcyclopentene. The structures are as follows:
Cyclic dimethylpentene:
H3C CH3
| |
C CH
| |
C CH
| |
C CH
| |
C CH
| |
C CH2
Linear dimethylpentene:
H3C CH3
\ /
C=C
/
C CH2
B) The cyclic dimethylpentene is likely to be the most stable isomer, as it has a more compact and organized arrangement of atoms, which leads to stronger bond interactions and a lower energy state. This can result in a lower heat of combustion compared to the linear isomer.
C) The linear dimethylpentene represents an achiral molecule, as it does not have a center of chirality.
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what produces the spectra in emission spectroscopy? a. frequency of spinning nuclei b. electronic transition from excited energy states to lower states
c. Frequency of molecular motions
d. Ionization and emission of electrons
The one produces the spectra in emission spectroscopy is b. electronic transition from excited energy states to lower states.
The emission spectrum for the chemical element is the frequencies of the spectrum of the electromagnetic radiation that is emitted by the electrons due to the transition from the higher energy state to the lower energy state. The energy of the photon of the photon emitted is equals the difference in energy between the two states.
The emission spectrum includes all the radiation that is emitted by the atoms or the molecules. The spectrum shows the intensity of the radiation at the different wavelengths.
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what smell have hydrogen peroxide?
Answer:
It is a Colourless and ODOURLESS gas
Using the equation outlined in this video for conversion of ppm to mg/m³, 1 ppmv of oxygen gas, O2, at 2 atm and 0°C is equal to how many mg/m³?? a. 778.5b. 2.85 c. 389.2d. 1.43
Using the equation outlined in this video for conversion of ppm to mg/m³, 1 ppmv of oxygen gas, O2, at 2 atm and 0°C is equal to 2.85 mg/m³.
The conversion of ppm to mg/m³ for a gas can be done using the following equation:
mg/m³ = (ppm) x (molecular weight) x (density of gas at standard temperature and pressure (STP)) / (10^6)
For oxygen gas (O2), molecular weight = 32 g/mol and density at STP = 1.429 kg/m³.
So, 1 ppmv of O2 at 2 atm and 0°C is equal to:
mg/m³ = (1 ppm) x (32 g/mol) x (1.429 kg/m³) / (10^6) = 2.85 mg/m³
Therefore, the answer is B. 2.85 mg/m³.
Using the equation outlined in this video for conversion of ppm to mg/m³, 1 ppmv of oxygen gas, O2, at 2 atm and 0°C is equal to 2.85 mg/m³.
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naturally occurring thallium has two isotopes, thallium-203 (202.9723442 amu) and thallium-205 (204.9744275 amu). the atomic mass of thallium is 204.38 amu. what is the percent of thallium-205?
The percentage of Thallium-205-205 in the isotope is 70%.
The naturally occurring thallium has two isotopes,
thallium-203 (202.9723442 amu) and thallium-205 (204.9744275 amu) the atomic mass of thallium is 204.38 amu.
Thallium-203 & 205 compounds are used in rat and ant poisons. Also it is used for detecting infrared radiation.
Thallium has not been produced in the United States since 1984, but is imported for use in the manufacture of electronics, low temperature thermometers, optical lenses, and imitation precious jewels.Let us say we have X% of Ti-205. Then the rest (100-X)% is the Ti-203 percentage.
It is given that average atomic mass of Ti is 204.4.
Mass of Ti-205 in isotope =[tex]\frac{X}{100}*205[/tex]
Mass of Ti-203 in isotope =[tex]\frac{100-X}{100}*203[/tex]
[tex]\frac{X}{100}*205+\frac{(100-X) }{100}*203=204.4[/tex]
205X+20300-203X = 20440
X = 70
So,
Therefore, the percentage of Ti-205 in the isotope is 70%.
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True or false: more snow fell during the time period when layer C formed than when layer B formed
Differentiate between electric current and resistance in three points fast pleaseee
The difference between electric current and resistance is given below:
Electric Current
A system of electric charges in motion is called electric current.The SI unit of current is Ampere (''Amp'')Itis the amount of charge flowing through a cross section in unit time is given by, I= Q/tResistance
Resistance is a material's tendency to resist the flow of charge (current).The SI unit of Resistance is ohm (Ω)Formula of Resistance R= ρ*L/AAn electric current is formed when a conducting path is created to allow electric charge to continuously move. Electrical resistance is directly proportional to length (L) of the conductor and inversely proportional to the cross-sectional area (A).
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in the reaction al2o3(s) → 2 al(s) 3/2 o2(g) where δe = 1676 kj how many grams of al can form when 1000 kj of heat is transferred.
In the reaction : Al₂O₃ ----> 2Al + 3/2 O₂ , The gram of Al can form when 100 kJ of heat is transferred is 32.19 gram.
The chemical reaction is :
Al₂O₃ ----> 2Al + 3/2 O₂
The Heat of reaction = 1676 kJ
The molar mass Al = 26.982 g/mol
The gram of Al can form when 100 kJ of heat is transferred is :
The mass of the Al = 1000 kJ ( 2 / 1676 ) × 26.982
The mass of the Al = 32.19 g
Thus, the mass of the Al is formed is 32.19 g.
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Suggest how the values for the atomic radii of the noble gases given in Section 9 in the IB Chemistry data booklet have been obtained.
The values for the atomic radii of the noble gases listed in the IB Chemistry data booklet have likely been obtained through several methods like Crystal lattice structures, Electron diffraction, X-ray diffraction and Spectroscopy.
These methods involve various techniques and calculations, but they are all based on the principle of measuring the size of noble gas atoms and determining the atomic radii based on these measurements.
The values listed in the data booklet are likely the average or most commonly accepted values obtained from multiple studies and measurements.
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what mass of aluminum has a total nuclear charge of 1.1 c? aluminum has atomic number 13. suppose the aluminum is all of the isotope with 14 neutrons.
The total nuclear charge of an atom is equal to the number of protons in the nucleus, which is also known as the atomic number. The atomic number of aluminum is 13, which means that aluminum has 13 protons in its nucleus. 1.6858 x 10⁻¹⁸ kg of aluminum has a total nuclear charge of 1.1 C.
The isotope of aluminum with 14 neutrons is known as aluminum-27, and its atomic mass is equal to 13 protons + 14 neutrons = 27 atomic mass units.
We can calculate the mass of aluminum with a total nuclear charge of 1.1 C by using the following formula:
mass = (total nuclear charge) / (elementary charge) x (atomic mass)
where the elementary charge is 1.602176634 x 10⁻¹⁹ C.
Plugging in the values, we get:
mass = (1.1 C) / (1.602176634 x 10⁻¹⁹ C) x (27 atomic mass units)
mass = 1.6858 x 10⁻¹⁸ kg
Therefore, 1.6858 x 10⁻¹⁸ kg of aluminum has a total nuclear charge of 1.1 C.
The nuclear charge, also known as the atomic number, is the number of protons in the nucleus of an atom. The protons are positively charged particles, and the number of protons in an atom determines the atomic number and the identity of an element. The nuclear charge of an atom determines its chemical behavior, as elements with the same number of protons are chemically similar.
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which of these situations would produce a hill plot with a hill coefficient less than 1?
The Hill coefficient, in this case, would be less than 1, indicating negative cooperativity.
The situation that would produce a Hill plot with a Hill coefficient of less than 1 is: A purified protein has multiple binding sites, and ligand binding to one site decreases the affinity of other sites for the ligand.
The Hill coefficient, denoted as n, represents the cooperativity of binding in a Hill plot. A Hill coefficient greater than 1 indicates positive cooperativity, where ligand binding to one site enhances the affinity of other sites.
On the other hand, a Hill coefficient of less than 1 indicates negative cooperativity, where ligand binding to one site decreases the affinity of other sites.
In the scenario where ligand binding to one site decreases the affinity of other sites, it implies negative cooperativity. This means that as more ligands bind to the protein, the affinity of the remaining sites for the ligand decreases.
Consequently, the Hill coefficient, in this case, would be less than 1, indicating negative cooperativity.
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Your question is incomplete, but most probably your full question was,
Which of these situations would produce a Hill plot with a Hill coefficient less than 1? A purified protein has multiple binding sites, and ligand binding to one site decreases the affinity of other sites for the ligand. A purified protein is a single polypeptide with one ligand-binding site, but the sample is contaminated with some partially denatured protein molecules. A purified protein has multiple binding sites, and ligands bind to each site independently without affecting the binding affinity of other sites. A purified protein is a single polypeptide with two ligand-binding sites, each having a different affinity for the ligand. Incorrect
hydrophobic molecules group of answer choices are ionic molecules that are attracted to the polar portion of the water molecule are uncharged, nonionic substances that seem to repel water are polar molecules that are attracted to the nonpolar portion of the water molecule are nonionic molecules that are attracted to the nonpolar portion of the water molecule
The Hydrophobic molecules are uncharged, nonionic substances that seem to repel water.
Hydrophobic substances do not have an affinity for water. Substances that are nonionic and nonpolar (or otherwise cannot form hydrogen bonds) actually seem to repel water; these substances are said to be hydrophobic (from the Greek phobic, fearing).
An example from the kitchen is vegetable oil, which, does not mix stably with water-based substances such as vinegar. The hydrophobic behavior of the oil molecules results from a prevalence of relatively nonpolar covalent bonds, in this case bonds between carbon and hydrogen, which share electrons almost equally.
Hence option c is the correct answer.
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--The complete question is, Hydrophobic molecules ________________________.
a. are polar molecules that are attracted to the non polar portion of the water molecule
b. are nonionic molecules that are attracted to the non polar portion of the water molecule
c. are uncharged, nonionic substances that seem to repel water
d. always have a partial charge at one end of the molecule
e. are ionic molecules that are attracted to the polar portion of the water molecule--
how to know whether element monatomic, made up of molecules, or form a large network of atoms bonded together
The monoatomic element can exist freely. The element which form molecules can not exist freely in nature, The element which have the property of the catenation and bonded by the covalent bonds in a continuous network.
1) Monoatomic = molecule of the element that has the atomicity 1 or the one atom in its molecule . The monoatomic are generally the noble gases that means they can exist freely.
example : Ar, He, Ne
2) Molecules : A molecule consists of two or the more atoms of the same element, or the different elements, that are the chemically bound together. The can not exist freely.
Example : sulfur, oxygen, nitrogen
3) The large network of atoms bonded together = A network solid or the covalent network of solid is the chemical compound (or element) ,that are bonded by the covalent bonds in a continuous network.
Examples : copper, gold, tin, diamond
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Select all intermolecular forces that contribute to creating a solution of CH₂Cl₂ In H₂O. a. London Dispersion b. lon-dipole
c. Dipole-dipole d. H-bonding
Dipole-dipole forces are used by CH2Cl2 to interact with H2O.
Between molecules with permanent dipoles, there are dipole-dipole forces (i.e., polar molecules). These forces become stronger with increasing polarity for molecules with similar size and mass. Additionally, nonpolar molecules can develop dipoles as a result of polar molecules, producing dipole-induced dipole forces. Being a polar molecule, CH2Cl2 and water exhibit dipole-dipole forces when combined.
Because their angles are not 180° in CH2Cl2, the dipole moments of H-H and Cl-Cl atoms do not cancel one another.
Due to the oxygen atom's high electronegativity in the centre of the water molecule, it is well known that the electrons are concentrated around it.
The oxygen molecule's bent shape has been attributed to the presence of lone pairs of electrons on the molecule.
The individual dipole moments produced by the two hydrogen atoms in a water molecule do not cancel one another out, so the dipole moment is not zero.
As a result, when CH2Cl2 and H2O interact, their permanent dipole moments produce dipole dipole forces.
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Consider the chemical equation.
2H2 + O2 Right arrow. 2H2O
What is the percent yield of H2O if 87.0 g of H2O is produced by combining 95.0 g of O2 and 11.0 g of H2?
Use Percent yield equals StartFraction actual yield over theoretical yield EndFraction times 100..
56.5%
59.0%
88.5%
99.7%
The percent yield of H2O is 87.87% if 87.0 g of H2O is generated by mixing 95.0 g of O2 and 11.0 g of H2.
How do we get mass from moles?The mass of any material will be computed using its moles as: n = W/M, where W is the provided or needed mass.
M stands for molar mass.
95g Oxygen (O2) moles = 95g / 32g/mol = 2.96 moles
11g hydrogen (H2) moles = 11g / 2g/mol = 5.5 moles
The following chemical reaction occurs: 2H2 + O2 2H2O
The stoichiometry of the reaction indicates that:
1 mole O2 interacts with 2 moles H2.
2.96 mole O2 = interacts with 22.96=5.92 mole H2
Because hydrogen has a smaller molecular weight, it is the limiting reagent in this case, and the creation of water is solely dependent on it.
2 moles of H2 equals 2 moles of water
5.5 moles of H2 results in 5.5 moles of water
W = (5.5mol)(18g/mol) = 99g is the mass of 5.5 moles of water.
Given a theoretical yield of water = 87g%, the water yield will be computed as follows:
% yield = (87 / 99)×100 = 87.87%
If 87.0 g of H2O is produced by combining 95.0 g of O2 with 11.0 g of H2, the percent yield is 87.87%.
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A solid produced by a chemical reaction in solution that separates from the solution is called?
A solid produced by a chemical reaction in solution that separates from the solution is called Precipitate.
Precipitate: a solid that forms from a chemical reaction taking place in solution and separates from the solution.
It can also be formed by passing a gas into an aqueous solution of a substance (like passing carbon dioxide into lime water).a solid created when a solution undergoes a change, frequently as a result of a chemical reaction or temperature shift that makes a solid less soluble. A precipitate in meteorology is either liquid or solid water (rain, snow, etc.)
The clear liquid remaining above the precipitated or the centrifuged solid phase is also called the 'Supernate' or 'Supernatant'.
Numerous instances of mineral production in nature can be attributed to precipitation reactions, such as metal sulphide creation at so-called "black smokers," submarine vents.Therefore, the chemical reaction in solution that separates from the solution is called precipitate.
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The results of the analysis of iron percentage in a sample are as follow: 19.93,19.88,20.00,19.90,19.98 and 19.95
Calculate a) Mean b) median c) Standard deviation d) Coefficient of variation
The mean of results given is 19.94, the median is 19.94, the standard deviation is 0.041 and the coefficient of variation is 0.002
Given the results of the analysis of iron percentage in a sample are:
19.93, 19.88, 20.00, 19.90, 19.98 and 19.95.
Mean is calculated as sum of observations divided by total number of observations.
Here, the total number of percentage analysis results = 6
(a) Mean = (19.93+ 19.88 + 20.00 + 19.90 + 19.98 + 19.95)/6
Mean= 119.64/6 = 19.94
(b) Median is the middle most value in a set of observations.
Arrange the given results in ascending order initially.
A.O = 19.88, 19.90, 19.93, 19.95, 19.98, 20.00
Since there are even number of observations the median is the average of two middle observations such that:
Median = (19.93 + 19.95)/2 = 39.88/2 = 1994
(c) The standard deviation is calculated as square root of variance such that variance is sum of the square of difference of each observation and mean divided by number of observations.
S^2 = [(19.88 - 19.94)^2 + (19.90 - 19.94)^2 + (19.93 - 19.94)^2 + (19.95 - 19.94)^2 + (19.98 - 19.94)^2 + (20 - 19.94)^2]/6
S^2 = [(-0.06)^2 + (-0.04)^2 + (-0.01)^2 + (0.01)^2 + (0.04)^2 + (0.06)^2]/6
S^2 = 0.00176
S = √0.00176 = 0.041
The standard deviation is 0.041
(d) Coefficient of variation is the standard deviation divided by the mean such that it is = 0.041/19.94 = 0.002
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hat is the name of the compound below? the line-angle structure shows a ring with six vertices and a circle inscribed, with a ch3 group attached to the first carbon and a cl atom attached to the second (clockwise) carbon. what is the name of the compound below? the line-angle structure shows a ring with six vertices and a circle inscribed, with a ch3 group attached to the first carbon and a cl atom attached to the second (clockwise) carbon. 1-chlorotoluene 2-chlorotoluene 3-chlorotoluene 4-chlorotoluene 5-chlorotoluene
The name of the compound is 2-chlorotoluene.
In natural science, the naming of mixtures keeps explicit guidelines and shows. The line-point structure you have given addresses a six-membered aromatic ring with a circle engraved, showing that it is a benzene ring.
The presence of a CH3 bunch joined to the main carbon and a Cl particle connected to the subsequent carbon demonstrates that the particle is chlorinated toluene.
To name the compound, we follow the show of numbering the carbons in the benzene ring with the end goal that the substituents get the most reduced conceivable number.
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how many 1h nmr signals does 2-chloro-3-methyl-2-butene exhibit? assume both allylic methyl show as chemically equivalent in the nmr. 1 2 3 4 5
2-chloro-3-methyl-2-butene exhibits 3 1H NMR signals, while assuming both allylic methyl show as chemically equivalent in the NMR.
Nuclear magnetic resonance spectroscopy, commonly known as magnetic resonance spectroscopy (MRS) or NMR spectroscopy, is a spectroscopic technique for studying the local magnetic fields surrounding atomic nuclei.The sample is placed in a magnetic field, and the nuclear magnetic resonance NMR signal is generated by radio waves excitation of the sample's nuclei, which is detected by sensitive radio receivers. The resonance frequency can be changed by the intramolecular magnetic field of an atom in a molecule, revealing details about the electronic structure and different functional groups of the molecule. The sole accurate method for identifying monomolecular organic molecules in modern organic chemistry is NMR signals spectroscopy because the fields are distinctive or extremely specific to certain substances.
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A patient is brought to the ED with respiratory depression. The patient has a history of COPD. What acid-base imbalance is most likely
A.Metabolic alkalosis
B.Respiratory acidosis
C.Metabolic acidosis and respiratory acidosis
D.Metabolic alkalosis and respiratory alkalosis
The most likely acid-base imbalance in a patient with respiratory depression and a history of COPD is Respiratory Acidosis So option B is correct.
Respiratory acidosis is a condition where there is a buildup of carbon dioxide (CO2) in the body, leading to an acidotic pH, which is below 7.35. This can occur in patients with respiratory depression because CO2 is not being effectively removed from the body through normal breathing. In a patient with a history of COPD, it is even more likely that this could occur because COPD can cause decreased lung function and decreased ability to effectively breathe and remove CO2.
Metabolic alkalosis is a condition where there is an excessive loss of acids from the body, leading to an alkaline pH, which is above 7.45. This is unlikely in this scenario.
Metabolic acidosis is a condition where there is an accumulation of acid in the body, leading to an acidotic pH. This is also unlikely in this scenario.
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Explain why the HOH molecule is bent, whereas the HBeH molecule is linear
The HOH molecule is bent, whereas the HBeH molecule is linear because the placement of the two sets of unpaired electrons in water forces the bonds to expect a tetrahedral arrangement, and the resulting HOH molecule is bent.
Why are molecules bent instead of linear?The presence of lone electron pairs in the central atom causes the bent structure of these molecules. Water, nitrogen dioxide, CH2, and other common bent molecules are listed below.
The primary distinction between linear and bent molecules is that linear molecules have atoms bonded together to form a straight molecule, whereas bent molecules have atoms arranged in a bent shape with an angle.
Thus, the oxygen atom, in addition to forming bonds with the hydrogen atoms, also displaces two pairs of unshared electrons.
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if an enzyme-catalyzed reaction has a velocity of 2 mm/min and a vmax of 10 mm/min when the substrate concentration is 0.5 mm, what is the km?
The Michaelis-Menten equation is used to describe the rate of enzyme-catalyzed reactions as a function of substrate concentration.
The equation is given by:
velocity = (Vmax × substrate concentration) / (Km + substrate concentration)
Where Vmax is the maximum velocity of the reaction and Km is the Michaelis constant, which is a measure of the substrate concentration required for the reaction to reach half of its maximum velocity (Vmax/2).
Given that the velocity of the reaction is 2 mm/min at a substrate concentration of 0.5 mm and a Vmax of 10 mm/min, we can use the Michaelis-Menten equation to solve for Km:
2 = (10 × 0.5) / (Km + 0.5)
Rearranging and solving for Km:
Km = (10 × 0.5) / 2 - 0.5
Km = 2.5 mm
So the Km for the reaction is 2.5 mm, which represents the substrate concentration required for the reaction to reach half of its maximum velocity (Vmax/2).
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which of the following intermediary metabolites enters the citric acid cycle and is formed, in part, by the removal of a carbon () from one molecule of pyruvate? a. lactate b. glyceraldehydes-3-phosphate c. oxaloacetate d. citrate e. acetyl coa
Acetyl CoA metabolites will enters the citric acid cycle and is formed, in a part, by the removal of a carbon () from one molecule of the pyruvate.
In the eukaryotic cells, the pyruvate molecules will be produced at the end of the glycolysis will transported into the mitochondria, which are the sites of a cellular respiration. If the oxygen will be available, aerobic respiration will go forward. In mitochondria, pyruvate will be transformed into a two-carbon acetyl group (by removing a molecule of carbon dioxide) that will be picked up by a carrier compound called as coenzyme A (CoA), which is made up from the vitamin B5. The resulting compound is called as acetyl CoA. It can be used in the variety of many ways by the cell, but its major function is to deliver the acetyl group which is derived from the pyruvate to the next pathway in the glucose catabolism.
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how many valance electrons would phosphorus (p) have, number of paired electrons and number of unpaired electrons?
Phosphorus (P) has 5 valence electrons. In its ground state, it will have 3 paired electrons and 2 unpaired electrons.
The number of valence electrons can be determined by using the periodic table. Look for the element in question, and identify its atomic number (the number of protons in the nucleus of an atom of that element). Then, use the electron configuration of the element to determine the number of valence electrons by counting the number of electrons in the outermost energy level (valence shell).
The electron configuration of Phosphorus (P) is: 1s2 2s2 2p6 3s2 3p3.
The outermost shell contains 5 electrons, thus 5 valence electrons.
The number of paired and unpaired electrons in an atom can be determined from its electron configuration also. If there are two electrons in a given energy level with opposite spins, they form a pair and are considered to be paired electrons. If there is only one electron in a given energy level, it has no pair and is considered to be an unpaired electron.
Hence, phosphorus will have 3 paired electrons and 2 unpaired electrons.
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which aqueous solution will have the lowest freezing point? group of answer choices 0.075 m cacl2 0.15 m nacl 0.10 m hcl 0.050 m ch3cooh 0.20 m c12h22o11
It is known that Colligative property is directly proportional to molality or concentration. More the concentration more will be the elevation in boiling point or depression in freezing point. 0.15 m NaCl will have the lowest freezing point among all other given options.
Also colligative property depends on the number of particles as well.
the decreasing order of freezing point depression as follows:
0.15 m NaCl > 0.20 m C₁₂H₂₂O₁₁ > 0.10 m HCl > 0.050 m CaCl₂ > 0.050 m CH₃COOH
Thus, 0.15 m NaCl will have the lowest freezing point.
[Note: 0.15 m NaCl = 0.30 m particle concentration (NaCl dissociate into two ions)
0.20 m C₁₂H₂₂O₁₁ = 0.20 m particle concentration (no dissociation of this molecule)
0.10 m HCl = 0.20 m particle concentration(HCl dissociate into two ions)
0.05 m CaCl₂ = 0.15 m particle concentration (CaCl dissociate into 3 ions)
0.05 m CH₃COOH = 0.10 m particle concentration (CH3COOH dissociate into two ions)
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Which of the following has the largest mass?
a. 1.0 gallon of gasoline
b. 1.0 gallon of water
c. 3.0 liters of gasoline
d. 5.0 pounds of potatoes
b. 1.0 gallon of water of the following has the largest mass. Mass determined by density of the substance.
How mass of a substance can be calculated by using its volume?Mass of each substances were calculated based on their density:
1.0 gallon of gasoline => 1 gal x 6.3lb/gal=> 6.3 lb
1.0 gallon of water => 1 x 8.3lb/gal = 28.3 lb
3.0 liters of gasoline => 3 x 1.7 lb/gal= 5.1 l
5.0 lb of potatoes
Hence, it is clearly from the above calculation that 1 gallon of water has largest mass.
Mass and mass density: what are they?The quantity of material that makes up a thing is known to as its mass. Density refers to how closely combined atoms are packed, or how close together they are in a substance. The notion of mass is used to measure inertia. Conversely, the degree of compactness is characterized by density.
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. Most silver is produced as a byproduct of copper, gold, lead and zinc refining.
a. True
b. False
Answer:
true is produced by byproduct of copper,gold lead and zinc refining.
what is the polarity of dna polymerase exonuclease activity
DNA polymerases have both exonuclease and polymerase activities, and both of these activities have polarity, meaning they can only act in a specific direction.
The exonuclease activity of DNA polymerases is 5' to 3' exonuclease, meaning it can only degrade nucleotides from the 5' end to the 3' end of the DNA strand. This activity is crucial for proofreading and correcting errors during DNA replication, as the exonuclease activity can remove any incorrectly incorporated nucleotides before they can be extended further.
The polymerase activity of DNA polymerases is also direction-specific and is always 5' to 3' polymerase, meaning it can only add nucleotides to the 3' end of the DNA strand. This activity is crucial for extending the growing DNA chain in the 5' to 3' direction.
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how many kr atoms are in 3.87 g of kr
____ atoms
2.77 × 10²² atoms are in 3.87 g of kr.
Krypton is the chemical element having symbol Kr and its atomic number will be 36. It is a odorless, tasteless, colorless, noble gas which occurs in trace amounts in the atmosphere and it is often used with other rare gases in the fluorescent lamps. It is chemically inert. Krypton, like the other noble gases, which is used in lighting as well as photography. Krypton light has many spectral lines, and krypton plasma is very useful in bright, high-powered gas lasers (krypton ion and excimer lasers), each of which resonates and amplifies a single spectral line.
Weight of Kr = 3.87g
Molecular weight of Kr = 83.80 g /mole
Number of moles of Kr = 3.87 g / 83.80 = 0.0461
The Avogadro's number will be 6.022 × 10²³ molecules /mole
The number of atoms of Kr = 1 atoms / molecules × 0.0461 mole × 6.022 × 10²³ molecules /mole
= 2.77 × 10²² atoms.
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