Many anions-containing substances, including sulfide (S2), hydroxide (OH), carbonate (CO32), and phosphate (PO43), are frequently insoluble in water. If one of these anions is dissolved in a solution with a metal cation like Fe2+, Cu2+, or Al3+, a precipitate will result from the addition.
What do you call a precipitate that forms from a solution?
An insoluble solid that separates from a liquid solution is known as a precipitate in chemistry. Precipitation is the term used to describe the insoluble solid emerging from the solution. Most frequently, the precipitate appears as a suspension.
What kind of product will precipitate?
If the resultant chemical is water insoluble, a precipitate will develop. As an illustration, a solution of magnesium bromide is combined with a solution of silver nitrate (AgNO3) (MgBr2).
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Based on electronegativity trends in the periodic table, predict which of the following compounds will have the greatest % ionic character in its bonds Select one: a. HCI b: Hz 0 c. HBr d:. Lil e. RbF
Rbf
The pattern of electronegativity across the periodic table is that electronegativity increases as you move up and to the right. Fluorine (F) has the greatest electronegativity, followed by rubidium, RbF will have the highest percentage of ionic bonds (Rb). The percentage of ionic character in the other compounds' bonds will be lower because they have less electronegativity than RbF. The difference between Rb's electronegativity of 0.82 and F's electronegativity of 4.0 is 3.18. This is significantly bigger than the differences between the other bonds, which range between 1.36 (HCl) and 1.90 (NH3) (HBr).
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Consider the following species when answering the following questions:
(i) PCl3 (ii) CCl4 (iii) TeCl4 (iv) XeF4 (v) SF6
For which of the molecules is the molecular geometry (shape) the same as the VSEPR electron domain arrangement (electron domain geometry)?
(i) and (ii)
(i) and (iii)
(ii) and (v)
(iv) and (v)
(v) only(ii) and (v)
The arrangement of the electron domains in a VSEPR and the molecular geometry (form) of CCl4 SF6 are both the same.
Option c is correct
Can one compare VSEPR and molecular geometry?Electron group geometry, which represents how electron groups (bonds and nonbonding electron pairs) are structured, is distinguished from molecular geometry, which specifies how the atoms in a molecule are organized.
What do molecular structure and electron domains reveal from VSEPR?In order to predict the three-dimensional structure, or geometry, of molecules, chemistry usually uses the valence-shell electron-pair repulsion (VSEPR) model. The structure of a molecule is estimated using a model that takes into account the attraction between electron pairs.
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Which element is most likely to react with chlorine?
Fluorine
Neon
Phosphorus
Sodium
Answer:
Sodium
Explanation:
sodium only has 1 valence electron, thus it wants to lose thar on electron to have a full shell of 8, making it extremely reactive
Which of the following arranges the molecules N2 , O2 , and F2 in order of their bond enthalpies, from least to greatest? (A) F2 (B) O2 (C) N2 (D) N2 < F2 < O2
The increasing order of bond enthalpies of the molecules N2,O2, and F2 from least to greatest is F2<O2<N2.
The term "bond enthalpy," often referred to as "bond-dissociation enthalpy," "average bond energy," or "bond strength," refers to the amount of energy that is held in a bond between atoms in a molecule. In particular, it refers to the energy required to cleave a bond in the gas phase in a homolytic or symmetrical fashion.
Shorter bonds are stronger bonds for a particular pair of atoms. The periodic table shows a drop in bond length throughout the period and an increase down a group. The reverse pattern is apparent in bond energy.
The length of the bond decreases while the bond's enthalpy increases with bond order.
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QUESTION 8
Match each description or chemical equation to be Exothermic or Endothermic.
While doing an experiment in my lab, upon
mixing two substances the beaker
containing the reaction starts to feel hot to
the touch.
A. Exothermic
B. Endothermic
Acetic acid reacts with sodium carbonate to
produce sodium acetate, carbon dioxide
gas and water.
AH = +200 kJ/mol
2H2
+ 02
2H2O + 500 kJ/mol
Answer:
1st Answer
= Exothermic reaction
2nd Answer
=Endothermic reaction
3rd Answer
= Endothermic reaction
What is the de Broglie wavelength of an electron traveling at 1.02×105m/s?
Answer:
1.82 x 10^-12 m.
Explanation:
The de Broglie wavelength of an electron traveling at 1.02 x 10^5 m/s is 1.82 x 10^-12 m.
The de Broglie wavelength of a particle is a measure of the particle's wave-like behavior, and it is given by the following equation:
λ = h / mv
where λ is the de Broglie wavelength, h is the Planck constant, m is the mass of the particle, and v is the velocity of the particle.
In the case of an electron traveling at 1.02 x 10^5 m/s, the de Broglie wavelength is given by the following calculation:
λ = 6.62 x 10^-34 J * s / (9.11 x 10^-31 kg * 1.02 x 10^5 m/s)
This simplifies to:
λ = 1.82 x 10^-12 m
Therefore, the de Broglie wavelength of an electron traveling at 1.02 x 10^5 m/s is 1.82 x 10^-12 m.
suppose you are told that the mass lies somewhere between 3950 and 4050 g. use scientific notation to report the value, showing an appropriate number of significant figures.
suppose you are told that the mass lies somewhere between 3950 and 4050 g, using scientific notation 4.00 x 10^3 gm is the report number.
The amount of energy contained in an element's atomic mass. It is voiced as a multiple with one the mass of the carbon-12 particle, which has an atomic mass of 12 units, 1.992646547 1023 gramme. 1 atomic mass unit (amu) equals 1.660539040 1024 gramme on this magnitude. Scientific notation is a way to write extremely large or extremely small figures. When a number between 1 and 10 is magnified by an authority of 10, it is written in scientific notation. 650,000,000, for example, can be authored in scientific notation as 6.5 1008.
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Provide the quantum numbers and related information for the following orbital, 5s. a) What is the principal quantum number, n? b) What is the angular momentum quantum number, I? c) What is the number of degenerate orbitals based on the magnetic quantum number?
d) How many radial nodes are there?
a) The principal quantum number, n will be 5.
b) The angular momentum quantum number, I will be 0.
c) The number of degenerate orbitals based on the magnetic quantum number will be 0.
d) The radial nodes are 4.
Quantum numbers are a group of numbers that are used to indicate the position of an electron within an atom as well as the energy it carries. Quantum numbers are classified as either primary, azimuthal, magnetic, or spin. There are a total of four quantum numbers.
(a) The fundamental quantum number, n, equals five(b) In the 5s orbital, l=0(c) -l to +l represents the range of possible ml values. Now that l equals zero, the only feasible value for ml is zero. Therefore, the 5s orbit has no degenerate orbit.(d) The number of radial nodes is equal to n minus l plus 1, and since n is equal to 5 and l is equal to 0, the number of radial nodes is equal to 5-1-0 = 4.You can also learn about quantum numbers from the following question:
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The standard emf for the cell using the overall cell reaction below is =2.20 V:
2Al(s) + 3I2(s) ? 2Al3+ (aq) + 6I- (aq)
The emf (voltage) generated by the cell when [Al3+] = 4.0 x 10-3 M and [I-] = 0.015 M
is_______ V
Cell produces an emf of 2.32 V.
Cell-An electrochemical cell is a structure that can produce electrical energy from chemical processes taking place inside of it or use external electrical energy to speed up chemical reactions taking place inside of it. These systems have the ability to transform chemical energy into electrical energy or the other way around.
For this cell reaction, use the Nernst equation at -
E0cell - (RTnF)InQ.
where is the standard cell emf, is the cell emf, is the concentration of, and is the concentration of, and n is the number of electrons exchanged during the cell reaction.
Fill in the above equation with each of the values provided.
So, emf is 2.32V.
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which of the following statements are true once the sodium chloride bond formation shown in the figure takes place? select all that apply. a.the resulting sodium cation has a stable octet in its valence shell. b.the resulting chlorine anion has a stable octet in its valence shell. c.the electrostatic attraction between the positive sodium ion and negative chlorine ion forms a nonpolar bond. d.the electrostatic attraction between the positive sodium ion and negative chlorine ion forms a polar covalent bond. e.the electrostatic attraction between the positive sodium ion and negative chlorine ion forms an ionic bond.
The correct answer is that sodium transfers one electron from chlorine to produce positive sodium ions and negative chloride ions, both of which have a charge of one.
The chloride ion, which is a chlorine anion and is a crucial electrolyte present in all physiological fluids, is the negatively charged component of several salts, including sodium and hydrogen chloride salts. It is in charge of controlling how much fluid enters and exits cells as well as preserving the body's acid/base balance.
Chloride is in fact a weak base in terms of its acid-base properties because of the negative value of the hydrochloric acid's pKa. The formula for protonating chloride is NaCl + H2SO4 NaHSO4 + HCl, and strong acids like sulfuric acid can do this. Ionic chloride salts interact with other salts to produce anions that are exchanged.
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How many molecules are in 41.5 moles of CO₂?
which of these structures represent 2-methylbutane? a molecule with the formula c h 3 c h c h 3. there is a c h 2 c h 3 group attached to the c h carbon. a molecule with the formula c h 3 c h c h 2. there is a c h 3 group attached to both the c h and c h 2 carbon. a molecule with the formula c h 3 c h 2 c h c h 3. there is a second c h 3 group attached to the c h carbon. a molecule with the formula c h 3 c h c h 2 c h 3. there is a second c h 3 group attached to the c h carbon. a molecule with the formula c h 3 c h c h 2. there is a c h 3 group attached to both the c h and c h 2 carbon.
Compounds with identical chemical formulae but differ in the sequence in which its atoms are bound are known as structural isomers. the CH3-CH2-CH2 me. CH3; CH3; CH3
Examples of structural isomers are given below.When two molecules have the same formula but distinct atom configurations or bonds, they are said to be structural isomers.... as in: The chemical formulae of butane and isobutane are identical because they both contain the same combination of carbon (C) and hydrogen (H) atoms.
What do structural isomers and functional isomers mean?The very same molecular formula (i.e., the same number of of the same elements) is shared by structural isomers known as functional isomers, but the atoms are joined in various ways, resulting in diverse groupings. These atom groups are referred to as functional groups or functions.
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during silica gel chromatography, it is normal for: during silica gel chromatography, it is normal for: all compounds to elute at identical rates, regardless of polarity less polar compounds to elute more slowly than more polar compounds more polar compounds to elute more slowly than less polar compounds
During silica gel chromatography, it is normal for: more polar compounds more polar compounds to elute more slowly than less polar compounds
Chromatography is a technique for separating mixture's constituent parts. Liquid chromatography includes several different subtypes, such as high-performance liquid chromatography (HPLC), size exclusion chromatography, and supercritical fluid chromatography. Ion-exchange, resin, and paper chromatography are some examples of alternative chromatographic techniques. According to their respective affinities for stationary and mobile phases, it is the process of separating the constituent components of a mixture. The samples are exposed to the mobile liquid flowing onto or through the stationary stable phase.
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two compounds (labeled i and ii) have a liquid crystal state. predict which compound has a higher temperature associated with the solid to liquid crystal phase change. explain your reasoning.
The isotropic, nematic, cholesteric (or helical), and smectic phases of liquid crystals are discussed.
What does crystal phase transition entail?
A fundamental occurrence that modifies the functionalities of solid-state materials is known as a structural phase transition. It is generally known that structural phase transitions result from variations in temperature and pressure and significantly alter the solid's physical characteristics.
What distinguishes solid crystal from liquid crystal?
The most significant experimental differences between solid crystals and liquid crystals with three-dimensional order are thought to be the formation of twisted structures in liquid crystals with optically active molecules but not in solid crystals, and the mixing of similar liquid crystal phases of various compounds.
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the 1995 nobel prize in chemistry was shared by paul crutzen, f. sherwood rowland, and mario molina for their work concerning the formation and decomposition of ozone in the stratosphere. rowland and molina hypothesized that chlorofluorocarbons (cfcs) in the stratosphere break down upon exposure to uv radiation, producing chlorine atoms. chlorine was previously identified as a catalyst in the breakdown of ozone into oxygen gas. using the enthalpy of reaction for two reactions with ozone, determine the enthalpy of reaction for the reaction of chlorine with ozone. Using the enthalpy of reaction for two reactions with ozone, determine the enthalpy of reaction for the reaction of chlorine with ozone. ClO(g) + O3(g) rightarrow Cl(g) + 2Oz(g) deltaH = -122.8 kJ/mol 2O3(g) rightarrow 3O2(g) deltaH =--285.3 kJ/mol O3(g) + Cl(g) rightarrow ClO(g) + O2(g) deltaH = ?
the enthalpy the reaction again for reaction of chlorine and ozone using the following formula: ClO + Nitrogen dioxide ----> Cl + 2O2; dHrxn1o ≈ -122.8 kJ 2O3 ----click 3O2; dHrxn2o.
what is enthalpy?The value of enthalpy is solely dependent on the temperature, pressures, the composition of the system, not on its history. It is an energy-like feature or state function that possesses the dimensions as energy (and is measured in terms of joules or ergs).
What does H in chemistry stand for?The term "enthalpy change" refers to the quantity of heat released or absorbed during a reaction that takes place under a constant amount of pressure. It has the sign H, which can be interpreted as "delta H."
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15.47 consider the 1 h nmr spectrum of the following compound, and rank the signals in terms of increasing chemical shift. identify the proton(s) giving rise to each signal: h o o oh o
Each signal's splitting (number of lines) is specified in terms of an increasing chemical shift, and the splitting tells us what is associated to a certain carbon (a). Lines N When moving from spectrum to structure, N-1 "neighbor" H's (b). N adjacent N+1 lines
What is proton?In the atom's nucleus, protons, which are positively charged particles, are found. The constituents of an atom are protons, electrons, and neutrons. The nucleus, located in the middle of an atom, contains all of its mass. Protons and neutrons, known collectively as nucleons, are found in the nucleus.
While the electric field of an electron is pointed inward, that of a proton is outward. These fields interact with other particles in a manner similar to a particle distorting the space around it.
What is examples of proton?A proton is, for instance, the nucleus of a hydrogen atom or the H+ ion. No of the isotope, every hydrogen atom has one proton, every helium atom has two, every lithium atom has three, etc.
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antoine develops a for chemical reactions based around the idea that most substances will chemically combine with an invisible gas in the atmosphere he calls oxygen. antoine uses his ideas to explain burning as the combination of a substance with oxygen, and reduction (e.g. during the formation of iron from iron ore) as the splitting of a substance from a chemical combination with oxygen.
Antoine develops a theory for chemical reactions based on the idea that most substances will chemically combine with an invisible gas in the atmosphere he calls oxygen.
A chemical reaction is a process in which one or more substances, also called reactants, are transformed into one or more different substances, called products. Substances are either chemical elements or compounds. A chemical reaction is the process of chemical transformation of one group of chemicals into another group.
Antoine Lavoisier developed the theory of combustion as a chemical reaction with oxygen. Antoine Lavoisier's work in defining the law of conservation of mass will help shape atomic theory. This discovery influenced atomic theory. Because we defined matter as consisting of atoms that are neither created nor destroyed during chemical reactions.
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31. An element has 11 protons and 12 neutrons. Which of the following is true of a neutral atom of this element?
A. Its atomic number is 12 and mass number is 23.
B. Its atomic number is 23 and mass number is 11
C. Its atomic number is 11 and mass number is 23.
D. Its atomic number is 23 and mass number is 12.
Answer:
C.
Explanation:
The term for a reaction where two solutions are mixed and an insoluble substance forms is called a _____ reaction.
chemical
soluble
precipitation
stoichiometry
balanced
Precipitation reactions are those in which two solutions are combined and an insoluble material results.
What are 4 examples of chemicals?Basic elements, including zinc, helium, or oxygen, as well as compounds comprised of components such water, dioxide, and salt, as well as more complicated materials, such as your computer, the air you breathe, rain, a chicken, an car, etc., are examples of chemicals. any chemical compound's name that includes the names of all of its constituent parts.
What are the 12 chemicals?Aldrin, chlordane, DDT, dieldrin, endrin, polychlorinated, hexachlorobenzen, mirex, polychlorinated polyaromatic, pentachlorophenol dibenzo-p-dioxins, polychlorinated dibenzofurans, but toxaphen were a set of 12 extremely persistent and hazardous chemicals.
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during the process of cloud formation, energy is taken from the surrounding air as water molecules condense into water or deposit to ice.
Condensed water or ice is the common component of all clouds. When rising air cools through expansion to the point where some water vapour molecules collide more frequently than they are torn apart by thermal energy, clouds are formed.
As ice crystals and suspended water droplets condense in the sky, clouds begin to form. There is always some invisible water vapour in the air, and this water vapour is what causes clouds to form in the first place. As the temperature drops, water vapour condenses.
For instance, cumulus clouds form when sunlight breaks the bonds that hold water molecules together, causing water to evaporate from soil, plants, and oceans. Cooler, heavier air sinks around the wet, warm patch of air above, clamping it off, and lifting it upward like a ghostly hot air balloon.
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Indicate the hypotheses and the statistical test to be used to analyze the data.
We are interested in the relationship between carbon monoxide concentrations and density of cars in a particular area of Riverside. For a particular street corner on 20 different days, we measure carbon monoxide levels and the number of cars per hour.
It is assumed that a researcher is interested in examining the connection between a population's carbon monoxide levels and the density of automobiles.
It is evident from the study question that there are two factors: the amount of carbon monoxide present and the density of automobiles. The researcher is interested in determining how closely the variables are related. As a result, the study topic is one of association. The interval/ratio scale is used to assess both variables. The connection is presumed to be linear, and the data's simple random samples can be considered to come from a bivariate normal population. The Pearson correlation test is the right statistical analysis to employ since the variables are assessed on an interval ratio scale.
The following is the null hypothesis:
H0:=0: There is no relationship between carbon monoxide levels and automobiles density.
The alternative theory is as follows:
H0: 0: There is a substantial linear link between the density of automobiles and the carbon monoxide concentration.
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Which of the following best helps explain why the pressure of a sample of CH4(g) (molar mass 16g/mol) is closer to the pressure predicted by the ideal gas law than a sample of NH3(g) (molar mass 17g/mol) ?NH3 molecules are polar while CH4 molecules are not, and the greater attractions between NH3 molecules cause the molecules to collide with the walls of the container with less force.
The following best helps to explain that the pressure of a sample of CH₄ is closer to the pressure predicted by gas law than a sample of NH₃ is NH₃ molecules are polar while CH₄ molecules are not.
The methane mole , CH₄ is the non polar molecule. the bond present between the CH₄ is the covalent bond. the compound is called as the covalent compound. the covalent compound is formed by the sharing of the electron pairs. The NH₃ is polar molecule. the NH₃ is also form the covalent bond but it has net dipole moment so, NH₃ is the polar covalent bond.
Thus, the pressure of a sample of CH₄ (molar mass 16g/mol) is closer to the pressure by the ideal gas law than a sample of NH₃ (molar mass 17g/mol): NH₃ molecules are polar while CH₄ molecules are not.
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complete and balanced the precipitation reaction . include physical states in your answe.
CuCl2(aq)+ Na2CO3(aq) > .............. + ............. ?
The complete equation for the precipitation reaction will be:
CuCl₂(aq)+Na₂CO₃(aq) > CuCO₃(s) + 2NaCl(aq)
From the reaction,
CuCl₂(aq)+Na₂CO₃(aq) are the reactants while CuCO₃(s) + NaCl(aq) are the products of the reaction.
In the reactants side there is 1Cu, 2Cl, 2Na and 1CO₃ while in the products side there is 1Cu, 1Cl, 1Na and 1CO₃
To balance both sides, we multiply NaCl by 2 to balance the Na and Cl atoms.
Therefore, the final balanced equation will be
CuCl₂(aq)+Na₂CO₃(aq) -----> CuCO₃(s) + 2NaCl(aq)
This reaction is balanced, and with the appropriate physical states of the reactants and products.
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if you suspected that a sample of rock you found was the igneous rock basalt, which of the following properties should it exhibit? group of answer choices small crystals, mafic composition large crystals, felsic composition clastic texture, biochemical composition non-foliated, texture, carbonate minerals
Basalt is a type of extrusive igneous (volcanic) rock that is low in silica concentration, has a dark color, and is relatively rich in iron and magnesium. Many basalts are incredibly fine-grained and compact, and some are almost glassy (tachylytes).
Many basalts are extremely fine-grained and compact, and others are even glassy (tachylytes). Porphyritic structure, in which bigger crystals (phenocrysts) of olivine, augite, or feldspar are embedded in a finely crystalline matrix, is far more common (groundmass).
The most prevalent porphyritic minerals in basalts are olivine and augite, with plagioclase feldspars also occurring in this form. Spongy or pumiceous basaltic lavas are common because secondary minerals like calcite, chlorite, and zeolites fill the steam voids.
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chromium is most toxic and highly soluble in its oxidized cr(vi) state but is less toxic and less soluble in its more reduced cr (iii) state. efforts to detoxify cr-contaminated groundwater have involved injkecting chemical reducing agents underground. another approach is bioremediation, which involves inkecting molasses or cooking oil into the contaminated groundwater. which of the following statements best explain how these substances promte the reduction of cr
The chemical element chromium has the atomic number 24 and the symbol Cr. It is the group 6's first element. It is a transition metal that is steely-grey, glossy, tough, and brittle.
The great corrosion resistance and hardness of chromium metal make it valuable.Reduced Cr(III), which is less harmful and less soluble, and oxidized Cr(VI), which is very toxic and soluble, are the two distinct states of chromium.
Due to erosion and other factors, the Cr(VI) levels in underground water are abnormally high. The rate of bacterial respiration is employed in bioremediation to lessen the toxicity of chromium. By adding molasses or frying oil to groundwater that has been contaminated with this kind of chromium, the levels of Cr(VI) can be reduced.
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based on the diagram, how many unpaired electrons are there and what is the bond order for cn ? group of answer choices bond order 1, 0 unpaired electrons bond order 2, 1 unpaired electron bond order 2, 2 unpaired electrons bond order 0, 1 unpaired electron bond order 3, 2 unpaired electron bond order 1, 2 unpaired electrons
According to the figure, CN has a 2.5 bond order and one unpaired electron.
We are aware that the CN molecule:
C has an atomic number of 6, the C atom has 6 electrons in total, N has an atomic number of 7, the number of electrons in the N atom is 7, there are 6 + 7 total electrons in a CN molecule;13 is the total number of electrons in CN.
The CN molecule's molecular orbital arrangement is as follows.
σ1s² < σ*1s² < σ2s² < σ*2s² < σ2pₓ² < π2p²ₓ= π2p¹y
Therefore, there are 9 bonding electrons. Consequently, there are 4 antibonding electrons.
The following formula determines the bond order:
Bond order = [tex]\frac{(no of bonding electrons - no of antibonding electrons)}{2}[/tex]
= [tex]\frac{9-4}{2}[/tex]
Bond order= 2.5
Therefore, the bond order of the CN molecule is 2.5 and there is 1 unpaired electron.
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rubidium is an element located below sodium in group 1 on the periodic table. which of the following statements is correct?
The correct statement, according to the statement about rubidium, is rubidium has a lower electronegativity and a higher ionization energy than sodium. Correct answer: letter D.
This is because elements in the same group on the periodic table tend to have similar chemical properties.
How elements in the same group on the periodic table share chemical propertiesElements in the same group have many similar chemical properties. For example, the group 1 elements, known as the alkali elements, have relatively low electronegativity and relatively high ionization energy. This means that alkaline elements are relatively reactive compared to other elements.
Also, elements in the same group have the same electron configuration. This means that elements in the same group have the same number of electrons in their last shell. This explains why elements in the same group have similar chemical properties.
Elements in the same group also have similar physical properties. For example, group 2 elements have a relatively low melting point. This means that the group 2 elements are relatively soft metals. This is a common feature among elements of the same group.
Rubidium is an element located below sodium in group 1 on the periodic table. Which of the following statements is correct?
A) Rubidium has a lower electronegativity and a lower ionization energy than sodium.
B) Rubidium has a higher electronegativity and a lower ionization energy than sodium.
C) Rubidium has a higher electronegativity and a higher ionization energy than sodium.
D) Rubidium has a lower electronegativity and a higher ionization energy than sodium.
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Exactly equal amounts (in moles) of gas A and gas B are combined in a 1 L container at room temperature. Gas B has a molar mass that is twice that of gas A. Which of the following is true for the mixture of gases? Check all that apply.
a. The molecules of gas B have a greater average velocity than those of gas A.
b. Gas B has a greater partial pressure than gas A.
c. The molecules of gas B have greater kinetic energy than those of gas A.
d. Gas B makes a greater contribution to the average density of the mixture than gas A.
Option D, Gas B indeed contributes more than gas A to the mixture's average density.
a. It is false to claim that the particles of gas B move at a faster average speed than those of gas A.
b. This claim is false since it implies that the saturation pressure of gas B is higher than that of gas A.
c. This claim is false since it implies that the particles of gas B have more kinetic energy than those of gas A.
d. This claim is accurate in that gas B contributes more than gas A to the mixture's average density. A gas mixture's density is determined by dividing its mass by its volume. The mass of the combination is the same as the combined masses of gas A and gas B. Both gases will have different masses since they have different molar masses but the same mole fraction.
The mass of gas B is equivalent to two-thirds of the mass of the gaseous phase, whereas the mass of gas A is equivalent to one-third of the weight of the gas mixture because gas B has a mass that is twice that of gas A. Gas B, therefore, makes a greater contribution to the gas mixture's density.
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The vapor pressure of liquid ethyl amine, C2H5NH2, is 40.0 mm Hg at 233 K.A sample of C2H5NH2 is placed in a closed, evacuated container of constant volume at a temperature of 349 K. It is found that all of the C2H5NH2 is in the vapor phase and that the pressure is 63.0 mm Hg. If the temperature in the container is reduced to 233 K, which of the following statements are correct?Choose all that apply.Liquid ethyl amine will be present.No condensation will occur.Only ethyl amine vapor will be present.The pressure in the container will be 42.1 mm Hg.Some of the vapor initially present will condense.
The following are the correct statements : . The pressure in the container will be 42.1 mm Hg.
The vapor pressure is the measurement of the tendency of the substance to change in to the gaseous or the vapor state. The vapor pressure of liquid ethyl amine, C₂H₅NH₂, is 40.0 mm Hg at 233 K.A sample of C₂H₅NH₂ is placed in a closed, evacuated container of constant volume at a temperature of 349 K. It is found that all of the C₂H₅NH₂ is in the vapor phase and that the pressure is 63.0 mm Hg. If the temperature in the container is reduced to 233 K.
P1 = 63 mmHg T1 = 349 K
P2 = ? T2 = 233 K
P1 / T1 = P2 / T2
P2 = P1 T2 / T1
P2 = ( 63 × 233 ) / 349
P2 = 42 mmHg
Then , The pressure in the container will be 42.1 mm Hg
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the society of automotive engineers has established an accepted numerical scale to measure the viscosity of motor oil. for example, sae 40 motor oil has a higher viscosity than an sae 10 oil. rank the following hydrocarbons by their expected viscosity. rank from most to least viscous. to rank items as equivalent, overlap them.
The viscosity of such a flow is its resistance. Because of the bonding that exists in organic liquids, as the chain lengthens, so does the viscosity. Consequently, the order should be as follows:
CH3CH2CH2CH2CH2CH2CH2CH2CH2CH3
CH3CH2CH2CH2CH2CH2CH2CH3
CH3CH2CH2CH2CH2CH3
A liquid can flow because its molecules can move around one another. The resistance to flow of motor oil is measured by its viscosity. Oil with a low viscosity, such 0W-20, flows more quickly than oil with a high viscosity (e.g. 20W-50). Imagine water and honey to serve as an example. Water flows significantly more quickly than honey when poured from a container. The thicker the oil, the higher the number. Oil thins out as the number decreases. An engine's typical working temperature is 212°F, or 100°C, so an oil with a grade of 5W-30 will have a viscosity rating of 30 at that temperature. When engine parts are cold, thin, low viscosity oils flow more easily to protect them. The film strength needed to protect engines at high temperatures is often best maintained by thick, high viscosity lubricants.
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