URGENT
The graph shows the distribution of energy in the particles of two gas samples at different temperatures, T1 and T2. A, B, and C represent individual particles.
Based on the graph, which of the following statements is likely to be true?
Particle B is more likely to participate in the reaction than particle A.
Particle C is more likely to participate in the reaction than particle B.
Most of the gas particles have either very high or very low kinetic energies.
More gas particles participate in the reaction at T2 than at T1.
Answers
Answer:
particle C is more likely to participate in the reaction than particle B
Related Questions
The dipole moment of BrCl is 0.518 D and the distance between atoms is 213.9 pm.
Part A
What is the percent ionic character of the BrCl bond?
Answers
The percent ionic character of the BrCl bond is 0.0505%.
How to calculate the percent ionic character?One way to calculate the percent ionic character is to multiply the measured dipole moment by the value of eR, then multiply that result by 100. When one charge is totally transferred during the creation of the bond and the subsequent ions are spherical, the value of eR is the value of the dipole moment.We must understand that a difference in electronegativity leads to an increase in the polarity of the connection and the ionic nature. By computing the charge on each atom, we can get the % ionic character. The ionic character percent is determined by dividing the original charge by the charge that is present on a single electron.Here I attached the calculation
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An experiment is performed to determine to determine the molar mass of a solid unknown monoprotic acid (HA) by titration with a standardized NaOH solution. A) What measurements must be made to determine the number of moles of NaOH used in the titration? B) Write a mathematical expression to be used in determining the number of moles used to reach the endpoint of the titration. C) How can you use the information in B) to determine the moles of acid, HA? D) To determine the molar mass of the acid what should be measured about the acid before the titration? E) Write the mathematical expression to calculate the molar mass of the acid. F) Draw the apparatus to be used in this titration indicating what is going to be in each part of the apparatus. G) If the original solid acid was not completely dry before the experiment, would the results be different? In which way? Explain. H) If the original procedure called for dissolving the acid in 25.0 mL , but 35.0 mL were accidentally used, how would the results be affected? Explain.
Answers
The number of moles of NaOH is calculated by multiplying the moles of KHP by the mole ratio of NaOH to KHP, which is found by the balanced chemical reaction previously discussed.
Why is it called titration?A titration is described as "the process of determining the amount of a substance A by adding calibrated increments of substance B, the titrant, with which it reacts until exact chemical equivalency is obtained (the equivalence point)" (Oxford Dictionary of Chemical Terms).
The moles of KHP are multiplied by the mole ratio of NaOH to KHP, which is determined by the balanced chemical reaction mentioned above, to determine the number of moles of NaOH. 3. To determine the molarity of the NaOH solution, divide the moles of NaOH by the amount of NaOH solution needed to reach the titration's endpoint, in this case, litres.
The formula is molarity (M) of the acid x volume (V) of the acid = molarity (M) of the base x volume (V) of the base when the titrant and analyte have a mole ratio of 1:1. The concentration of a solution, measured in moles of solute per litre of solution, is known as its molarity.
Ha has a 268-gram mass per mole in its molar form. Ha is not a recognised chemical symbol for an element.
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Find an axis of rotation in this molecule. Are there any planes of symmetry?
O There is no axis of symmetry There is no plane of symmetry O There is one axis of symmetry along the axis of the purple and central atom. O There are two axes of symmetry along the axes of the brown and central atom. O The flat molecule lies in the only plane of symmetry
O There are two planes of symmetry, one in the plane of the molecule and one between the two brown atoms along the purple-black axis
Answers
A molecule can be split into two mirror-image halves by employing a hypothetical plane called a plane of symmetry.
What is meant by hypothetical plane?A hypothetical statement is one that is based on hypothetical concepts or circumstances rather than real-world ones. Through a mental modelling process, hypothetical thinking entails picturing potential outcomes and examining their effects.In fact, it is conceivable that there are differences between hypothetical and real choices: hypothetical choices, which have no consequences, might be quick and mindless, requiring fewer cognitive resources, whereas real choices, which are precise, immediate, frequently have higher stakes, and are frequently more emotionally charged. To test intuitions, hypotheticals are an effective tool. A hypothetical does not, in their opinion, accurately portray a real-world circumstance, which is why many individuals find it troublesome. Instead, the only time it poses an issue is when it is falsely depicted as being realistic.Planes of Symmetry
A molecule can be divided into two halves that are mirror images of one another using an imaginary plane known as a plane of symmetry.
The vertical plane in 2-chloropropane, (a), CH3CHClCH3, divides the H atom, the C atom, and the Cl atom.
The CH3 group (brown) on the mirror's right side is a reflection of the CH3 group (brown) on the left side. The split atoms' left and right halves are also.
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Consider the following reaction:
NO+O3?NO2+O2,rate= k[NO][O3]
Part A
What is the overall reaction order?
Answers
The overall reaction order is simply the sum of orders for each reactant. For the example rate law here, the reaction is third order overall (1 + 2 = 3).
What is the overall order of the reaction given the rate law?The concentrations of reactants frequently influence a reaction's rate, as was discussed in the preceding lesson. The link between the rate of a chemical reaction and the concentration of its reactants is expressed mathematically by rate laws, often known as differential rate laws or rate equations. Take the chemical equation's description of the reaction as an example.
aA+bB⟶products
rate is equal to k[A]m[B]n, where [A] and [B] are the reactant molar concentrations and k is the reaction's rate constant, which varies depending on the reaction's temperature. The reaction orders' exponents, m and n, are normally positive integers, however they can also be fractions.
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Chemists have determined that elements with atomic numbers greater than 92 are all
radioactive. In general, their half-lives are much shorter than the age of the universe. This
means that they no longer exist in nature and have all been artificially produced by
scientists in nuclear reactions.
Elements 93 through 105 in the periodic table have been created and named, and
scientists have claimed discovery of elements 106 and 107. The transuranium elements,
as they are called, become less stable as the atomic number and mass increase. For
example, element number 93, neptunium, has a half-life of two million years, while
element number 104, kurchatovium, has a half-life of 70 seconds.
The transuranium elements are the heaviest elements that exist and are readily
fissionable when subjected to nuclear bombardment. Chemists studying these elements
and the periodic table predict that stable elements may be found around atomic numbers
114 or 126.
Based on the information in the passage, which of the following relationships appears to
be true for those elements 93 through 105?
A. The greater the half-life, the greater the radioactivity.
B. The greater the atomic number, the greater the element stability.
C. The greater the radioactivity, the greater the half-life.
OD. The greater the atomic number, the lower the half-life.
OE. The greater the atomic number, the higher the half-life.
Answers
Answer:
The correct relationship is D. The greater the atomic number, the lower the half-life.
The passage states that the transuranium elements, elements with atomic numbers greater than 92, have short half-lives and become less stable as the atomic number and mass increase. It also gives specific examples of the half-lives of neptunium (element 93) and kurchatovium (element 104) to support this claim. Thus, as the atomic number increases, the half-life of the element decreases.
sample multiple choice question on quantum mechanical atomic model under analysis
sample questions on how ions are formed
Answers
Ions are formed by chemical interactions of accepting or loosing electrons.
What are ions?An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.
Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.
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Which of the following choices is an example of an acquired trait?
a human is born with brown eyes
a dog’s ears are bandaged so that they stand upright and her tail is docked short
a horse is born with a light-colored mane
a cat is born with black and white fur
Answers
Answer:
a dog’s ears are bandaged so that they stand upright and her tail is docked short
Explanation:
The dog is not born with ears that stand up or a short tail, therefore they are acquired traits.
What alkene is the major product formed from the following alkyl halide in an E1 reaction?
Answers
Alkenes are a group of unsaturated hydrocarbons with at least one double bond between carbon atoms that are pure carbon and hydrogen based.
What is alkene?Alkenes are a group of unsaturated hydrocarbons with at least one double bond between carbon atoms that are pure carbon and hydrogen based. Olefins is another name used to denote alkenes. The double bond in alkenes makes them more reactive than alkanes. A hydrocarbon with a carbon-carbon double bond is known as an alkene in organic chemistry. Any hydrocarbon with one or more double bonds is referred to as an alkene, which is frequently used as a synonym for an olefin. The distinction between internal and terminal monoalkenes is made in general.The 2-step elimination reaction, referred to as the E1 reaction, involves the creation of a carbocation as an intermediate step. The system expels a proton and a leaving group. In this instance, the rate is only influenced by the substrate. In compounds when more substituted alkenes are produced, the primary product will be taken into consideration.More +I impact will be visible from them as the number of substituted alkyl groups increases. The product generated becomes more stable as a result.As a result, the primary product generated in an E1 reaction is:To learn more about alkene refer to:
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Describe how ionic compounds form? Make sure to include what happens to the valence electrons. Which way does the electron travel? How do we determine the number of electrons that are transferred? And what holds them together?
Answers
Ionic compounds form through the transfer of electrons between atoms. In order for an ionic compound to form, one atom must give up one or more of its valence electrons, while another atom must gain one or more electrons to fill its valence shell.
The transfer of electrons occurs from the atom with the lower ionization energy to the atom with the higher electron affinity. This means that the electron is transferred from the element that is in the lower position in the periodic table and is more likely to lose an electron, to the element that is in the higher position in the periodic table and is more likely to gain an electron.The number of electrons transferred is determined by the difference in the number of electrons needed to fill the valence shells of the two atoms. For example, if one atom has two valence electrons and another atom has six valence electrons, then four electrons would need to be transferred in order for the two atoms to fill their valence shells and form an ionic compound.Once the electrons have been transferred, the resulting ions are held together by the electrostatic force of attraction between the positively charged ions and negatively charged ions. This creates a strong bond between the ions, forming a stable compound.What are ionic compounds?Ionic compounds are formed when one atom loses one or more electrons and another atom gains the same number of electrons. The atom that loses electrons is called a cation, and the atom that gains electrons is called an anion.
The cation and anion are attracted to each other by the electrostatic force of attraction between opposite charges, resulting in the formation of a stable compound.
Ionic compounds can be formed by both metals and nonmetals, but typically occur between a metal and a nonmetal. Metals tend to lose electrons easily and form cations, while nonmetals tend to gain electrons easily and form anions. The electron transfer process is driven by the desire of both atoms to fill their valence shells and achieve a stable electron configuration.
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Total cations =
Total anions =
Answers
There are eight cations (A and B) and four anions in the unit cell as shown here.
What is the unit cell?A unit cell is the smallest repeating unit in a crystal lattice structure. It is defined by the repeating pattern of atoms, ions, or molecules that make up a crystal. The unit cell can be visualized as a small box that is repeated over and over again to form the entire crystal.
The shape and size of the unit cell are unique to each type of crystal and are determined by the arrangement of atoms within the crystal. The study of unit cells is important in understanding the properties and behavior of materials at the atomic scale.
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why do the electron configurations in question 5 all end with the same sublevel notation
Answers
since they are all in group 1A, electron configurations with the same sublevel designation (alkali metals). Each one has a valence electron that is positioned in a S orbital.
How do electrons work?The electron is a subatomic particle with a basic electric charge of -1. Electrons are often thought of as elementary particles since they belong to the first generation of lepton particles, having no known components, or substructure.
An atom may have an electron linked to it or be without one. An electron is a subatomic particle that has a negative charge (not bound).
Protons, neutrons, and electrons make up the atom's nucleus. The electron is the smallest atom-forming particle and a carrier of a negative charge.
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What is the RMS velocity (in m/s) of Kr gas at 387 K?
Answers
The root mean square velocity or RMS velocity of krypton gas (A = 83.8 g) at 387 K is 341 m/s.
What is RMS velocity?According to kinetic theory of gases, the root mean square velocity of a gas is related with the temperature in K, universal gas constant R and mass of the gas M as follows:
u = √3RT/M
Given the temperature T = 387 K
atomic mass of Kr = 83.8 g = 0.083 Kg
R = 8.314
Then rms velocity = √(3 × 8.314 Kgm²/s²/K mol × 387 K)/ 0.083 Kg
= 341 m/s
Therefore, the RMS velocity of krypton gas at 387 K is 341 m/s.
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why is the melting point of toluene only -95°c, whereas that of benzene is 5°c?
Answers
The primary difference between toluene and benzene is the presence of a methyl group (-CH3) on one of the carbon atoms in toluene.
What is benzene?Benzene is an organic compound and an aromatic hydrocarbon composed of six carbon atoms joined in a ring, with one hydrogen atom attached to each. It is a colorless and highly flammable liquid with a sweet smell. It is a naturally occurring component of crude oil, and it is one of the most important industrially-produced chemicals in the world.
This methyl group increases the size of the molecule and its ability to interact with other molecules. This increased interaction between molecules causes toluene to have a higher boiling point and melting point than benzene.
The melting point of toluene is -95°C, whereas the melting point of benzene is 5°C. This difference is due to the increased ability of the toluene molecule to interact with other molecules. When toluene is heated, the increased interactions between molecules cause them to move more quickly, leading to a higher melting point than benzene.
Additionally, the presence of the methyl group on the toluene molecule increases the shape of the molecule, making it less symmetrical than benzene. This asymmetry can also affect the strength of the intermolecular forces, leading to a higher melting point.
Overall, the difference in melting points between toluene and benzene can be attributed to the increased size and shape of the toluene molecule, as well as its increased ability to interact with other molecules.
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Select the ester that could be used to make 4,6-decanedione by acylation of 2-pentanone. A Ethyl hexanoate. B Ethyl ethanoate. C Ethyl butanoate. Ethylpropanoate. E Ethyl pentanoate.
Answers
By acylating 2-pentanone, ethyl pentanoate serves as the ester that produces 4,6-nonanedione. Acylation is the process of replacing a hydroxyl group in a molecule with an acyl group.
In plain English, what is ester?Any of a group of organic molecules known as esters can react with water to create alcohols and organic or inorganic acids. The most prevalent esters are those made from carboxylic acids. Leopold Gmelin, a German scientist, coined the word "ester" in the first part of the 19th century.
What is the purpose of ester?These and other hazardous esters with unique odors are employed in synthetic tastes, perfumes, and cosmetics. For coatings, paints, and varnishes, some volatile esters, particularly large volumes of ethyl acetate
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for the following reaction sequence, which molecule is expected as the major product?
Answers
The first reaction is an oxidation reaction, which converts molecule A to molecule C using hydrogen peroxide (H2O2) and hydroxide (OH-) as the oxidizing agents.
The second reaction is a further oxidation reaction, which converts molecule C to molecule D using H2O2 and OH- as the oxidizing agents. Therefore, molecule D is expected as the major product of the reaction sequence.
The oxidation of A to C involves the addition of oxygen atoms to the molecule. This process is catalyzed by the presence of hydrogen peroxide (H2O2) and hydroxide (OH-) ions, which act as the oxidizing agents. In the second reaction, the oxidation of C to D involves the further addition of oxygen atoms to the molecule. This process is also catalyzed by H2O2 and OH- ions, resulting in the formation of molecule D as the major product of the overall reaction sequence.
the complete question is : For the following reaction sequence, which molecule is expected as the major product?
[tex]$\ce{A + B - > [\ce{H2O2/OH-}] C - > [\ce{H2O2/OH-}] D}$[/tex]
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If your front lawn is 19.0
feet wide and 20.0
feet long, and each square foot of lawn accumulates 1050
new snowflakes every minute, how much snow, in kilograms, accumulates on your lawn per hour? Assume an average snowflake has a mass of 1.50 mg.
Answers
The mass of snow in kilograms that accumulates on your lawn per hour is 35.91 kg.
What is the area or the lawn?The area of the lawn is determined as follows:
Area of the lawn = length * breadth
Area of the lawn = l20 * 19 square feet
Area of the lawn = 380 square feet
Mass of an average snowflake = 1.50 mg
Total number of snowflakes that the lawn accumulates per hour = 1050 * 380 * 60
Total number of snowflakes that the lawn accumulates = 23940000 snowflakes
Total mass in kilograms of that the lawn accumulates per hour = 23940000 * 1.50 mg * 1 mg / 1000000 kg
Total mass in kilograms of that the lawn accumulates = 35.91 kg
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5. Give two examples of native Hawaiian living matter.
Answers
Here, "Kanaka Maoli" redirects. See Kanaka (disambiguation) for other uses.
What is the major product obtained from the addition of HBr to the following compound?
Answers
1-Bromo-4-methylpentane is the main byproduct of the addition reaction of HBr to 4-methylpent-1-ene in the presence of peroxide.
What is methyl pentane?A branched-chain alkane with the chemical formula C₆H₁₄ is 2-methylpentane, also known as is hexane. A methyl group is attached to the second carbon atom in a pentane chain to form this structural isomer of hexane. A methyl group is substituted at position 3 of the alkane 3-methylpentane, which is pentane. It serves as a lubricant, a solvent in chemical synthesis, and a starting point for making carbon black. It functions as an allelochemical, a human metabolite, and a non-polar solvent. To make the secondary alcohol 3-methyl-2-pentanol, a hydroxy group is added to position 2 of 3-methylpentane. It performs three different roles: biomarker, human xenobiotic metabolite, and plant metabolite.The complete question is:
The major product obtained by the addition reaction of HBr to 4-methylpent-1-ene in the presence of peroxide is:
A) 1-Bromo-4-methylpentane
B) 4-bromo-2-methylpentane
C) 2-bromo-4-methylpentane
D) 3-bromo-2-methylpentane
E) 2-bromo-2-methylpentane
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If the number of protons of an atom is always equal to the number of electrons and the core of an atom includes the nucleus and all layers of electrons that are not the valence layer. What is the number of electrons in the core of a ground state bromine atom?
Answers
The atomic number of bromine is 35. Thus the total number of electrons is 35. The number of core electrons is 28.
What is bromine ?Bromine is 35th element in periodic table. It is a nonmetal and is placed in the 17th group called halogen group. Bromine relatively electronegative in nature and form ionic compounds.
The atomic number of an atom is the number of its total electrons in the neutral state. The electrons which are occupied in the higher energy levels that is in the outer orbitals far from the nucleus is called valence electrons. All other electrons are called inner electrons or core electrons.
Bromine contains total 35 electrons. Out of which 7 are valence electrons. Thus, the number of core electrons in the ground state of bromine is 35 -7 = 28 electrons.
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which of the following molecules would have the greatest proportion of enol at equilibrium?
A. OHC-CH2-CHO
B. CH3COCH2COOCH3
C. CH2(COOH)2
D. CH3COOH
Answers
The molecules would have the greatest proportion of enol at equilibrium is
OHC-CH2-CHO
What are molecules?A group of two or more atoms bound together by the attractive forces known as chemical bonds is referred to as a molecule; depending on the context, the term may or may not include ions that meet this requirement. a substance's tiniest particle possesses all of its physical and chemical characteristics. A single atom or more make up a molecule. Individually neutral particles make up an atom. The bonding of two or more atoms forms molecules, which are neutral entities. An ion is a particle that is positively or negatively charged. Matter includes the stars, the air, the water, the furniture you use every day, the trees and plants in your surroundings, as well as your body and intellect.
The molecules would have the greatest proportion of enol at equilibrium is
OHC-CH2-CHO
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Predict the major organic product that results from hydrogenation of the given alkene as specified. * Use the wedge hash bond tools to indicate stereochemistry where it exists. * You do not have to explicitly draw H atoms.
* If a group is achiral, do not use wedged or hashed bonds on it.
* In cases where there is more than one answer, just draw one.
Answers
In order to give shortenings a hard firmness and plasticity and allow for the manufacturing of solid and semi-solid fats, hydrogenation is the process of saturating some double bonds and converting others to trans configuration.
In the food industry, hydrogen is added to oils (in a procedure called hydrogenation) to make them more solid or "spreadable." In addition to being utilized in the production of numerous meals, including biscuits and cakes, hydrogenated oils can also be sold directly as "spreads" in the food industry. By converting all of the double bonds in the fat to single bonds during full hydrogenation, all unsaturated fats are converted into saturated fats. By substituting a portion of the double bonds with hydrogen, partial hydrogenation decreases some of the double bonds but not all of them.
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When the supplied alkene is hydrogenated, the primary organic molecule that results is a hydrocarbon. Hydrocarbons are found in natural gas, coal, and gasoline.
A hydrocarbon is an elemental chemical compound composed only of the atoms of hydrogen and carbon. Hydrocarbons, which are naturally occurring compounds, are the building blocks of crude oil, natural gas, coal, and other key energy sources. The four categories of hydrocarbons are alkanes, alkenes, alkynes, and aromatic hydrocarbons. The simplest explanation is that chemicals known as hydrocarbons are made up of both hydrogen and carbon, as well as their derivatives (alcohols,aldehydes..etc). The hierarchical series of hydrocarbons has the formula CnH2n+2 for alkanes, CnH2n for alkenes, and CnH2n-2 for alkynes. The term "hydrocarbons" refers to the most basic category of organic substances. As hinted by their name, they are made exclusively of the elements hydrogen and carbon.
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Show the starting diene and dienophile you could use to prepare the following molecule: CO2CH3 Diene + Dienophile- O Use the wedge/hash bond tools to indicate stereochemistry where it exists.
O If a group is achiral, do not use wedged or hashed bonds on it. O Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. O Separate multiple reactants using the + sign from the drop-down menu. ору 88te
Answers
Diene: These compounds have a double bond that is conjugated. Dienophile: At least one pi bond exists in these compounds. And occasionally, these pi bonds joined together after some electron withdrawal.
Examples of stereochemistry and what it is:The field of chemistry known as stereochemistry is concerned with "the study of the various spatial configurations of atoms in molecules." The methodical presentation of a particular area of science and technology, known as stereochemistry, typically necessitates a little detour into the past.
How would you define stereochemistry?a discipline of chemistry that examines the spatial configuration of atoms and groups in molecules, as well as how that configuration relates to the attributes of a substance.
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Which of the following species contributes more to the overall hybrid for the species in the box? a) I b) II с) I d) IV e) The one in the box. - Z:
Answers
option c 1 contributes more to the overall hybrid for the species in the box among the given boxes
It is because the negative charge must be on the most electronegative element for the resonance structure to be most stable and hence to make more contribution to the hybrid structure. IV is incorrect because look at the lower carbon atom which is bonded to nitrogen. In the original structure it has only two visible bonds that means it is also bonded to two hydrogen atoms. But in IV it has three visible bonds which means only one hydrogen atom. So it is not a correct resonance structure at all.
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The complete question is
Which of the following species contributes more to the overall hybrid for the species in the box? a) I b) II с) I d) IV e) The one in the box. - Z:
what is the use of hexane in contact cement?
Answers
The main use of hexane is as a solvent to extract edible oils from seed and vegetable crops. Hexane are used as solvents for contact cement, varnishes, and inks.
What is hexane used for ?Hexanes are mostly used as a solvent. It is used to extract edible oils from seeds and vegetables and as a cleaning agent. The high levels of hexane causes mild central nervous system effects it includes dizziness, slight nausea, and headache etc.
In the construction industry, the hexane is an effective chemical which is use as the strongest organic solvents. It dissolves chemical material which allows the objects to bind together to form a strong force.
Thus, Hexane are used as solvents for contact cement, varnishes, and inks.
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Question 6 (17 points)
Find the number of moles in 508 g of ethanol (C₂H6O).
Answers
Answer:
11.043 moles
Explanation:
In order to calculate the moles, we first need to find the molar mass of the compound.Therefore:
Mr of C[tex]_{2} }[/tex]H[tex]_{6}[/tex]O = (12 x 2) + (1 x 6) + 16
= 46 g
Now to calculate the moles we use the formula : given mass/molar massTherefore we get: 508/46 = 11.043 moles
Predict the major product(s) you would obtain from sulfonation of o-dichlorobenzene.
Answers
The major product(s) you would obtain from sulfonation of o-dichlorobenzene is attached below.
The sulfonation process: what is it?The process in which a sulfonic group SO₃H is incorporated into a molecule with the ability to donate electrons is known as sulfonation. If the electron donor molecule is a carbon molecule, the reaction's end result can be identified as sulfonic acid.
A chemical process that adds the sulfonic acid functional group (-SO₃H) to an existing molecule. Benzene becomes benzene sulfonic acid through the process of sulfonation with Sulphur trioxide and sulfuric acid.
Sulfonation is an important chemical process that is used to create a variety of sulfonic acid derivatives and sulfonyl chlorides. Many sulfonic acids fall under the general category of RSO₃H, where R stands for an organic substituent like an alkyl or aryl group.
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A 0.10 M HF solution is 8.4% ionized. Calculate the H+ ion concentration.
Answers
The H+ ions concentration in a 0.10 M HF solution that is 8.4% ionized is 0.0084 M.
Describe ionization of hydrofluoric acid (HF).The ionization of a weak acid, such as hydrofluoric acid (HF), can be described by the following equilibrium:
HF(aq) <=> H+(aq) + F-(aq)
The equilibrium constant for this reaction is known as the acid dissociation constant (KA) and can be used to calculate the H+ ion concentration in a solution of a weak acid.
The percent ionization of a weak acid is defined as the ratio of the concentration of H+ ions at equilibrium to the initial concentration of the acid, multiplied by 100.
In this case, the percent ionization of the 0.10 M HF solution is 8.4%. Therefore:
(H+ ion concentration at equilibrium/initial concentration of HF) * 100 = 8.4%
Hence, the H+ ion concentration at equilibrium is (8.4/100) * 0.10 M = 0.0084 M
So, the H+ ion concentration in a 0.10 M HF solution that is 8.4% ionized is 0.0084 M.
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a tip link connects two cilia. movement of the cilia in the direction of the tallest cilia will
Answers
a tip link connects two cilia. movement of the cilia in the direction of the tallest cilia will result in the opening of the ion channels located at the tip of the cilia.
A tip link is a thin protein filament that connects the tallest cilia of two neighboring cells. The movement of the cilia in the direction of the tallest cilia, known as the "power stroke," causes the tip link to stretch and pull on the ion channels located at the tip of the cilia, opening them and allowing ions to flow through. This movement of ions is what generates the electrical potential that allows for the detection of sound, fluid flow, or other mechanical stimuli.
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An experimental plot of ln(Pvap) vs. 1/T is obtained in lab for an unknown liquid. The slope of the best-fit line for the graph is -3840 K. What is the enthalpy of vaporization for the liquid in kJ/mol?
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The enthalpy of vaporization of the unknown liquid is -31.9 kJ/mol.
What is the enthalpy of vaporization?We know that vaporization is the process that occur when there is a change from liquid to gas of a material at the boiling point of the substance . We must also note that the boiling point of the substance is the atmospheric temperature which is 1 atm.
Thus;
lnP = -ΔHvap/R * 1/T
We know that;
P = atmospheric pressure
R = gas constant
T = temperature
Hence;
ln(1) = -ΔHvap/8.314 * 1/ -3840
-3840 * 8.314 = -ΔHvap
= -31.9 kJ/mol
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which of the following statements identifies why this formula–name combination is wrong?
A. SO42- should be named sulfate, not sulfite.
B. Mg should be named magnesium, not manganese.
C. Mg is a group 2A metal, thus no Roman numeral should be used.
D. All of the statements identify why the formula-name is wrong.
Answers
Option D , All of the statements identify why the formula name is wrong.
SO42 named as Sulfate ,not sulphite because Sulphate is an chemical compound that consists one Sulphur atom with four Oxygen atom surrounding it . Mg named as Magnesium not Manganese .Magnesium is a chemical element atomic number 12 and its place value in periodic table is Group IIA while Mn(Manganese )have its own place value and its is located in the d block of modern periodic tablr. Magnesium is an Alkaline earth metal with only one possible charge so no Roman numeral value is needed for it .
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