an uniform combination known as a solution because seawater has the same properties across the entire mixture.
Is ocean water a substance or an element?There are numerous distinct chemicals in seawater. When the water in seawater evaporates and salt is left behind, some of these substances can be seen. Pure substance made of hydrogen and oxygen is called water, or H2O.Salts and water combine to form seawater. The salts are referred to as the solute and the water as the solvent in this mixture.Water is a common substance. Hydrogen and oxygen are the two elements that make up water.Water consists of two hydrogen atoms and one oxygen atom in each individual particle. The smallest component of a compound is a molecule.Because it contains the same concentration of each of its components throughout the solution and can be physically separated, salt water qualifies as a solution. and the O represent for the elements oxygen and hydrogen, respectively.To learn more about ocean water a substance or an element refer to:
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Alchemy is a branch of ancient knowledge that states that all matter is composed of air, fire, earth, and water. Which of these best explains whether alchemy is a science or pseudoscience? it is a science because all matter is known to be made of elements. It is a science because air, fire, earth, and water all are forms of matter. It is pseudoscience because all matter is known to be made of atoms. It is pseudoscience because ancient knowledge is mystical yet reliable.
The statement that "it is pseudoscience because ancient knowledge is mystical yet reliable" is the most appropriate explanation.
Alchemy is considered a pseudoscience. The statement that "all matter is composed of air, fire, earth, and water" is not consistent with our modern scientific understanding of matter. Alchemy was an ancient practice that attempted to transform base metals into noble metals (such as gold) and find a way to achieve eternal life, among other goals. While alchemy did contribute to the development of early chemistry and the discovery of some chemical processes, its beliefs and methodologies were often based on mystical and philosophical concepts rather than empirical scientific evidence.
In contrast, modern science understands that matter is composed of atoms and elements. The periodic table categorizes all known elements, and we have a comprehensive understanding of atomic structure and chemical reactions, which is not consistent with the alchemical view of matter being composed of air, fire, earth, and water.
Therefore, the statement that "it is pseudoscience because ancient knowledge is mystical yet reliable" is the most appropriate explanation. Alchemy is considered pseudoscience because its claims and theories were based on mystical and speculative beliefs rather than the systematic empirical observations and rigorous scientific methodology that characterize genuine scientific endeavors.
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1. Calculate the quantitative concentration of sodium chloride (NaCI) solution, which contains 0.3 mol of NaCI in 0.5 dm3
2. Determine the concentration of magnesium chloride solution (MgC12), which in 200 cm3
contains MgCl2.
3. How many grams of sodium hydroxide (NaOH)
needed to prepare 100cm3 of solution
mass concentration 80q/dm3?
given that the standard gibbs energy change for the following reaction is 23 kj mol-1 at 298 k what are the concentrations of ca2 and so42- at equilibrium?
The standard Gibbs energy change for the following reaction is 23 kj mol-1 at 298 k what are the concentrations of ca2 and so42- at equilibrium is 3032K.
What is Gibbs energy ?
The Gibbs free energy, also referred to as the Gibbs function, Gibbs energy, or free enthalpy, is a unit of measurement used to determine the maximum amount of work that can be accomplished in a thermodynamic system when the temperature and pressure are held constant.
What is equilibrium ?
Chemical equilibrium is characterized as a dynamic condition in which the concentration of each reactant remains constant. Even if they aren't equal, they aren't altering. An equilibrium state in a chemical reaction is denoted by a double arrow. Left are reactants, and right are products.
ΔG∘=−1486kJ/mol
T=3032K
ΔG∘=ΔH∘−TΔS∘
Under standard conditions T=298K
∴ΔG∘=−1648.4×10³−(298×−543.7)
ΔG∘=−1486 kJ/mol
At equilibrium ΔG=0
∴0=ΔH∘−TΔS∘
assuming the enthalpy and entropy changes don't change much with temperature we can use the standard values.
∴T=ΔH∘ΔS∘
T=−1648.4×10³−543.7K
T=3032K
Therefore, standard Gibbs energy change for the following reaction is 23 kj mol-1 at 298 k what are the concentrations of ca2 and so42- at equilibrium is 3032K.
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If a radioactive iotope ha a half-life of 8. 45 year, how many year will it take for the ample to decay to 81. 12 % of it original amount?
It will take two decades for a radioactive isotope with a half-life of 8.45 years to decay to 81.12% of its initial mass.
Why is something radioactive?Something that shows or is produced by radioactive is referred to as radioactive. Radiation, which typically manifests as electromagnetic waves or swiftly moving elementary particles like protons or neutrons, is released when anything is radioactive.
What materials cause radioactive substances?The term "radioactivity" is used to characterize the natural mechanism by which some atom spontaneously split into distinct, more stable atoms, producing both particles and energy. Because unstable isotopes frequently change into more stable isotopes, this process, also known as radioactive decay, takes place.
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what is the symbol for the following ion electronic structure: 1s22s22p63s23p63d104s24p64d105s2 with an atomic number of 50?
For the given ion electronic structure, the atomic number is 50, electrons present in this ion is 48, it forms cation with +2 charge. The atom is Tin and the symbol is "Sn".
What is electronic configuration?
Also called electronic structure, the arrangement of electrons in orbits around the nucleus. The electron configuration of atoms in quantum mechanical models is given by ordering the occupied orbitals in order of packing, with the number of electrons in each orbital indicated as a superscript.
What is atomic number?
The atomic number, or atomic number of a chemical element, is the number of electric charges in the nucleus. For normal atomic nuclei, this equals the number of protons, or the number of protons found in the nucleus of each atom of that element. Atomic numbers can be used to uniquely identify common chemical elements.
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a 25.0 ml sample of 0.105 m hcl was titrated with 31.5 ml of naoh. what is the concentration of the naoh? group of answer choices 0.075 m 0.105 m 0.132 m 0.0833 m none of the above
The NaOH 31.5 ml of 0.0833 M NaOH will be required to 25.0 mL of 0.105 M HCl.
Given
M1= 0.105 M HCl
V1 = 25 ml HCl
M2 = ?
V2 = 31.5 ml NaOH
From concentration calculation
M1V1 = M2V2
0.105 M x 25 ml = M2 x 31.5 ml
M2 = 0.0833 M NaOH
Titration is a technique for determining an unknown solution's concentration. Titrating refers to a solution's known concentration. The burette is filled with the titrant. Analyte or titrate refers to the solution's undetermined concentration. In Erlenmeyer, the analyte or titrate is added.
Hence, HCl is titrated with NaOH in given concentrations.
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which of the following generates the most ions per mole of solute when dissolved in dilute aqueous solution? group of answer choices a. nahso4 b. mgcl2 c. nacl d. c2h5oh e. caso4
MgCl₂ generates the most ions per mole of solute when dissolved in dilute aqueous solution because MgCl₂ dissolves completely in aqueous solution and Molarity of MgCl₂ is higher than all given ionic compounds nahso4, nacl, c2h5oh and caso4.
The equation for the dissociation of MgCl₂ in an aqueous solution is:
MgCl₂→Mg²⁺ + 2Cl⁻
Based on the equation for the reaction, for every mole of magnesium ions present in the solution, there are two moles of chloride ions. This is the case because in order to balance the charges to form the compound, the total anionic and cationic charges should be equal.
What is Molarity ?
Molarity is a concentration in terms of moles per litre of solution. Because an ionic compound dissociates into its components cations and anions in solution, the key to the problem is identifying how many moles of ions are produced during dissolution.
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2. what key features should be present in the ir spectrum of your product if you successfully made the desired bromohydrin? what key features should be absent from the ir spectrum if the starting material was completely reacted?
The key features that should be present in the IR spectrum of your product if you successfully made the desired bromohydrin and the key features that should be absent from the IR spectrum if the starting material was completely reacted are the spectra of the other alcohols.
Spectra of other alcohols used in the synthesis show the presence of bromohydrin. The presence of bromohydrin with a characteristic hydroxyl stretch indicates the presence of alcohol.
What is bromohydrin?Bromohydrin is formed by adding Br and OH to an alkene, the result is known as bromohydrin (bromine = bromine, hydrin = hydrogen, water).
The synthesis of bromohydrins involves highly regioselective ring expansion from epoxides to halohydrins using hydrogen and lithium halides in the presence of cyclodextrin in water as solvent.
What is IR spectrum?
A common absorption method for both qualitative and quantitative evaluation is infrared (IR) spectroscopy. Electromagnetic radiation that can change the vibrational and rotational states of covalent bonds in organic molecules is in the infrared region of the spectrum.
so as we know that bromohydrin by Br and OH there should be ir spectrum of Br dan OH in the IR spectrum of product
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the reduction of nitric oxide with hydrogen is second order in and first order in . complete the rate law for this reaction in the box below. use the form , where '1' is understood for , ... (don't enter 1) and concentrations taken to the zero power do not appear. rate
(order in NO ) + (order in H2 ) = overall order = third
2 + (order in H2 ) = 3
(order in H2 ) = 3 - 2 = 1 = first order in H2 .
Rate = k[ NO ] 2 [ H2 ] 1 = k[NO]2[H2] .
What is Rate of reaction?
The rate at which reactants change into products is known as the rate of reaction or reaction rate. It goes without saying that the rate at which chemical reactions take place varies greatly. While certain chemical reactions occur almost instantly, others typically take time to achieve their final equilibrium.
Reaction rate is the rate at which a chemical reaction moves forward. It is frequently described in terms of either the concentration of a reactant that is consumed in a unit of time or the concentration of a product that is generated in a unit of time (amount per unit volume).
You may also define it in terms of how much of the reactants are used up or how much of the products are produced in a given amount of time. Consider, for illustration, a reaction where the balanced chemical equation is of the type A + 3B → 2Z.
The following alternate ways of expressing the rate are also possible:
Where t is the time, [A], [B], and [Z] are the substance concentrations, and a, b, and z are their amounts, the formula reads: d[Z]/dt, -d[A], -d[B], dz/dt, da/dt, and db/dt. Please take note that these six expressions are not interchangeable; rather, they are just connected.
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6.0 l of an unknown gas has its pressure increased from 3.0 atm to 5.0 atm. assuming temperature remains constant, what would be the final volume in liters (l) of the unknown gas?
The gas would have a 11.05 L volume at a constant temperature.
What is gas in science?Individual atoms, elemental molecules derived from a single type of atom, or complex molecules derived from a number of atoms can all be found in a pure gas. A gas mixture like air contains a variety of pure gases. A gas is a form of matter that adapts the form of the container it is housed in and creates an uniform distribution inside the container, defying gravity and having no concern for the substance amount present.
What are 5 examples of gas?Gases include substances like oxygen, carbon dioxide, nitrogen, hydrogen, helium, steam, and dry ice, to name a few. Because their particles are much more dispersed than those in solids or liquids, gases are thought to be significantly less dense.
Briefing:P1 = 3.0 atm
V1 = 6 lit
P2 = 1240 mm Hg = 1.63 atm
V2 = ?
P1V1 = P2V2
3.0 X 6 = 1.63 X V2
V2 = 11.05
When a fixed mass of gas is cooled, its volume decreases, and when the temperature is raised, its volume increases.
V1 / T1 = V2 / T2 (Sometimes known as Charles's Law)
V1 = is the starting volume
T1 = is the starting temperature
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what happens to the temperature of a mixture of ice and liquid water as heat is applied at a constant rate?
The temperature of the mixture does not change at all until all the ice has melted, at which point it increases at a constant rate.
A physical number known as temperature expresses the concepts of hotness and coolness in numerical form. With a thermometer, temperature is measured.
Thermometers are calibrated using a number of temperature scales that have defined distinct reference points and thermometric substances. The most widely used scales are the Kelvin scale (K), which is mostly used for scientific reasons, the Fahrenheit scale (°F), and the Celsius scale (°C), formerly known as centigrade, with the unit symbol °C. In the International System of Units, one of the seven base units is the kelvin (SI).
The lowest temperature on the thermodynamic scale is absolute zero, or 0 kelvin, or 273.15 degrees Celsius. As stated in the third law of thermodynamics, experimentally it can only be very closely approached but not actually reached.
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Balance the following reaction. A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coefficient is "1." CH3OH + O2 → CO2 + H2O
The balanced equation of the chemical reaction would be [tex]2CH_3OH + 3O_2 -- > 2CO_2 + 4H_2O[/tex]
Balancing the equation of reactionsIn order to balance equations of reactions, the equations need to obey the law of conservation of atoms. According to this law, atoms can neither be created nor destroyed during reactions, but their forms may change. In other words, the total number of atoms of different elements in reactions is conserved.
Thus, the same number of atoms of different elements must exist in the reactants and the products, irrespective of their forms.
Following this rule, the balanced reaction of the equation illustrated in the problem would be: [tex]2CH_3OH + 3O_2 -- > 2CO_2 + 4H_2O[/tex]
In the balanced equation, one can see that C, H, and O atoms in the reactants and the products are of equal numbers.
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the major product of the given reaction has the molecular formula c10h16o3. draw its structure in the most stable tautomeric form. the starting material is a 7 carbon chain where carbon 1 is double bonded to oxygen and single bonded to o c h 2 c h 3. carbon 2 has a methyl substituent. carbon 7 is double bonded to oxygen and single bonded to o c h 2 c h 3. this reacts with n a o c h 2 c h 3, followed by an acidic aqueous workup.
The same atoms make up tautomers, which are isomers with various electrical and molecular configurations. The associated tautomeric form is the most reliable.
Describe tautomery.
Tautomery is a specific type of isomery caused by a shift in one or more atoms' positions inside the molecule. The molecule electronic distribution and, consequently, the molecular structure are altered by this shift in location.
Tautomerization, the constant interconversion, is what gives equilibrium to the isomeres known as tautomers in solution. The same kind and number of atoms are present in both molecules.
The item in the suggested example has the chemical formula C10H16O3. In isomeric molecules, 6C, 16H, and 3O are essential. The distribution of these atoms, however, fluctuates, changing the structure of the resultant molecule.
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Which of the following statements is not true? a. lonic compounds typically have higher melting points than molecular compounds b. Covalent bonds form between non-metal and metal elements
c. Molecular compounds share electrons to form bonds between atoms d. Ionic bonds in the melted state can conduct electricity
The statements which is not true is Covalent bonds form between non-metal and metal elements as ionic bond forms between non-metal and metal elements .
What is Covalent bonds?The bond formed by pairing of electrons between the atoms by sharing electron to each other is known as Covalent bonds. It is generally formed between two Non-metals.
Ionic bond:
Ionic Bond is formed because of electrostatic attraction. This generally formed in the opposite charged ions of the atoms that why they generally form between Metals and Non- metals.
Hence, statements which is not true is Covalent bonds form between non-metal and metal elements as ionic bond forms between non-metal and metal elements .
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what is the standard emf of a galvanic cell made of a ni electrode in a 1.0 m ni(no3)2 solution and a cr electrode in a 1.0 m cr(no3)3 solution at 25°c?
The standard emf of a galvanic cell made of a Ni electrode in a 1.0 M Ni(NO₃)₂ solution and a Cr electrode in a 1.0 M Cr(NO₃)₂ solution at 25 °C is 0.51 V.
the reduction potential of Ni²⁺ = - 0.23
the reduction potential of Cr³⁺ = - 0.74
the reduction potential of the Ni²⁺ is higher than the reduction potential of Cr³⁺. that mean Ni²⁺ undergoes the reduction.
the standard emf cell expression is given as follows :
the standard emf cell , E = E Ni²⁺/Ni - E Cr³⁺ / Cr
= - 0.23 - ( - 0.74 )
= - 0.23 + 0.74
= 0.51 V
Thus, The standard emf of cell is 0.51 V.
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what is the concentration of an n a o h naoh solution if it takes 12.50 ml 12.50 ml of a 0.100 m h c l 0.100 m hcl solution to titrate 25.00 ml 25.00 ml of the n a o h naoh solution?
The concentration of NaOH is 0.05 M
given that :
molarity of HCl solution, M1 = 0.100 M
volume of HCl solution, V1 = 12.50 mL = 0.0125 L
volume of NaOH solution, V2 = 25 mL = 0.025 L
molarity of NaOH solution, M2 = ?
using the titration formula we get :
M1 V1 = M2 V2
putting the value in the formula :
0.100 × 0.0125 = M2 × 0.025
0.00125 = M2 × 0.025
M2 = 0.05 M
Thus, the concentration of an NaOH solution if it will takes 12.50 mL of a 0.100 M HCl of the 25 mL is 0.05 M.
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a physician attempts to aspirate a knee joint and obtains 0.1 ml of slightly bloody fluid. addition of acetic acid results in turbidity and a clot. this indicates that:
This indicates that hyaluronic acid clots in the presence of acetic acid.
The ability of hyaluronidase to prevent the development of a tight mucus clot with acetic acid shows the existence of highly polymerized hyaluronic acid. In vitro, highly polymerized hyaluronic acid is produced by cultured cells of different mesenchymal tissues. The concentration of hyaluronic acid in freshly prepared, concentrated embryo extract was determined to be between 210 and 240 mcg/ml.
Hyaluronic acid found in embryo extract was depolymerized in tissue culture with days between medium changes.
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The complete question is
A physician attempts to aspirate a knee joint and obtains 0.1mL of slightly bloody fluid. Addition of acetic acid results in turbidity and a clot. This indicates that
Most studied answer
a)the fluid is synovial fluid
b)hyaluronic acid clots in the presence of acetic acid.
c)hyaluronic acid is part of synovial fluid
what amount of moles of chlorine is needed to react with 1.2 moles of phosphorus trichloride to produce phosphorus pentachloride? pcl3 cl2 ->pcl5
When 1.2 moles of phosphorus trichloride reacts then 1.2 moles of chlorine is needed.
pcl3+cl2 ->pcl5
1 moles of PCl3 reacts with 1 mole of Cl2 to produce 1 mole of pcl5.
now, if 1.2 moles phosphorus trichloride reacts then same amount (1.2 mole) is needed to make 1.2 mole of phosphorus pentachloride.
When determining how much of a substance there is, the concept of a mole is helpful. When dealing with particles at the atomic (or molecular) level, it is commonly known that even a single grams of a pure element includes an astoundingly high number of atoms. The mole notion is widely utilized in this context. The most common unit of measurement is the "mole," which is a count of many particles.The number 6.02214076*1023, commonly known as the Avogadro constant, is frequently denoted by the letter "NA". Among the elementary entities that can be represented in moles are atoms, molecules, monoatomic and polyatomic ions, as well as other particles (such as electrons).
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what is the mole fraction of ethanol c2h5oh in an aqueous solution that is 46 perccent ethanol by mass?
The mole fraction of ethanol c2h5oh in an aqueous solution that is 46 percent ethanol by mass is 0.25
Mole fraction is the mole of one of the component of the solution divided by the total moles of the solution
Calculating the mole fraction of ethanol,we get
Percentage by weight of ethyl alcohol is 46% which implies in 100 g of this solution is 46 g while the mass of the water will be 54% of 100 g = 54g.
Finding the moles of water and the ethyl alcohol {molar mass of water(H₂O) = 18 and molar mass of ethyl alcohol(C₂H₆O = 46}
Moles = mass/molar mass
moles of ethanol = 46/46 = 1
moles of water = 54/18 = 3
ntotal=1+3=4
Mole fraction of ethanol is:
Mole of ethanol = 1/4
Total mole of solution
Hence, the mole fraction is 1/4 or 0.25
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when an atom loses or gains electrons the electron dot symbol for the resulting ion will be different than that of the original atom. if ar were to lose 2 electrons what would be the new electron dot symbol of the ar2 ion?
The dot structure of Ar will have 6 electron in their valence shell.
Lewis dot structures, also known as electron dot structures, are schematics that show the interatomic chemical bonds in a molecule. Additionally, they show how many lone pairs there are overall in each of the atoms that make up the molecule. Common names for Lewis dot structures include electron dot structures and Lewis structures. Lewis described an acid as an electron pair acceptor, while a base is an electron pair giver.
The electronic structures of the elements, including the electron pairings, are reflected in the Lewis dot structures. Lewis structures can be viewed as "electron bookkeeping" and are a helpful way to condense some bonding-related information. Each dot in a Lewis dot structure corresponds to an electron. A bond is denoted by two dots placed between the atoms in chemical symbols.
Hence, Ar dot structure will be different from neutral Ar atom.
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(a) What is the net redox reaction that occurs when Pt comes into contact with acidic KMnO4? (Use the lowest possible coefficients. Omit states-of-matter from your answer.)
chemPad
Help
2MnO4- + 16H+ + 5Pt → 5Pt2+ + 2Mn2+ + 8H2O
Correct.
(b) What is E°cell for the reaction?
Net Redox Reaction when Pt(Platinum) comes in contact with KMnO4 is : 2MnO4- + 16H+ 5Pt → 5Pt2+ + 2Mn2+ 8H2O .
Potassium permanganate(KMnO₄) is strong oxidizing agent which is reduced and oxidizes Pt (Platinum) according to the two-half reactions:
The oxidation reaction: Pt → Pt²⁺ + 2e.
The reduction reaction: MnO₄⁻ + 8H⁺ + 5e → Mn²⁺ + 4H₂O.
To obtain the net redox reaction, we multiply the oxidation reaction by 5 and the reduction reaction by 2 to equalize the no. of electrons in the two-half reactions.
So, the net redox reaction will be:
2MnO4- + 16H+ 5Pt → 5Pt2+ + 2Mn2+ 8H2O
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.
if a catalyst were added to the reaction of crystal violet with sodium hydroxide, which effects could occur? i. the mechanism of the reaction would change. ii. the activation energy of the reaction would change. iii. the rate of the reaction would change.
If a catalyst were added to the reaction of crystal violet with sodium hydroxide, effects could occur is the mechanism of the reaction would change , the activation energy of the reaction would change and the rate of reaction would change.
When we add catalyst to the reaction the rate of reaction would change . the catalyst decreases the activation energy of the reaction . it will speed up the rate of the reaction. the mechanism of the reaction would change.
Thus, the catalyst lowers down the activation energy of the reaction . so, the rate of the reaction would change.
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what ph indicator is added to the simmons citrate agar? group of answer choices phenol red methylene green bromothymol blue litmus
The most common pH indicator used in Simmons Citrate Agar is Bromthymol Blue (BTB)
Simmons Citrate Agar is a selective and differential medium used for the detection and differentiation of Enterobacteriaceae (gram-negative bacteria).
The medium contains sodium citrate as the sole carbon source, which is used to differentiate organisms based on their ability to utilize citrate as a sole carbon source.
The medium also contains pH indicators that change color based on the pH of the medium. The most common pH indicator used in Simmons Citrate Agar is Bromthymol Blue (BTB).
BTB is a pH indicator that turns yellow in acidic conditions and blue in basic conditions. As the bacteria metabolize the citrate in the medium, they produce acids, which cause the medium to become acidic.
This change in pH is detected by the BTB, which changes color from blue to yellow. The yellow coloration of the medium is an indication that the organism is utilizing citrate as a sole carbon source.
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could you determine the molar mass of magnesium based on the total chloride ion concentration in the solution instead of using the amount hydrogen gas produced?
The ideal gas law and the gas mass are both used to determine the amount of hydrogen in moles. Learn about the ideal gas law, which is expressed as PV = nRT, where "P" stands for pressure, "V" for volume, "n" for the number of moles of a gas, and "T" for temperature.
The weight of one mole of a sample is known as the molar mass. To determine the molecular mass of a molecule, multiply the subscript (number of atoms) by the atomic mass of each element in the molecule, then add the masses of all the elements in the molecule together.
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which substance has the lower molar entropy? which substance has the lower molar entropy? they are both the same. there is no way to know. ne (g) at 298 k and 1.00 atm kr (g) at 298 k and 1.00 atm
The atomic mass of Kr > Ne, Kr has greater standard molar enthalpy, and Ne has lower standard molar enthalpy. For a given pair of molecules with similar properties, the one with greater atomic mass has a greater molar entropy. one with greater atomic mass has greater entropy under identical conditions of a number of moles, temperature and pressure.
What is Entropy?The amount of thermal energy per unit of temperature in a system that cannot be used to carry out beneficial work is known as entropy. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion.
What is Enthalpy?Enthalpy, a characteristic of a thermodynamic system, is the result of adding the internal energy of the system and the product of its pressure and volume. It is a state function that is utilized in several measurements in chemical, biological, and physical systems under constant pressure.
Hence, the atomic mass of Kr > Ne, Kr has greater standard molar enthalpy, and Ne has lower standard molar enthalpy.
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what role do currents play in transporting heat? why is this important? what happens when a warm-phase enso occurs?
There are three stages to the ENSO weather phenomena. The Pacific Ocean can experience El Nio (extremely warm currents), La Nia and Neutral from October through spring of the next year.
What phase of ENSO is it right now?
The most current ONI value is -1.0oC (August to October 2022). Based on the Oceanic Nino Index (ONI) [3 month running mean of ERSST. v5 SST anomalies in the Nino 3.4 zone (5N-5S, 120-170W)], recent Pacific warm (red) and cold (blue) episodes are shown.
Is ENSO cool or warm?
El Nio, Neutral, or La Nia are the three possible ENSO patterns in the tropical Pacific. El Nio and La Nia (the warm phase of each) (the cool phase)
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3.00 g of AgNO3 is used to make how many moles of Ag with excess Cu
Cu + AgNO3 à Cu(NO3)2 + Ag
According stoichiometry and balanced chemical equation,as 339.74 g produces 2 moles , therefore 3 g is produced by 0.017 moles of silver.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the given example, according to balanced chemical equation as 339.74 g of silver nitrate produces 2 moles,
∴3 g of silver nitrate will produce 3×2/339.74=0.017 moles.
Therefore, 3.00 g of AgNO₃ is used to make 0.017 moles of silver.
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Explain why the balls representing fluorine and hydrogen have only one hole drilled in them, while oxygen has two and carbon has four.
Because carbon establishes four bonds to other atoms, whereas hydrogen and fluorine only form one, the balls used to symbolize these elements have four and oxygen has two holes, respectively.
Fluorine is univalent, which means it can only create one bond with hydrogen, whereas carbon is tetravalent and can establish up to four bonds. As a result, carbon has four pegs while fluorine and hydrogen only have one. Each molecule of HF has one hydrogen atom that may form a hydrogen bond, while the fluorine atom possesses three lone pairs of electrons. The maximum amount of hydrogen atoms can form hydrogen bonds, and each HF molecule will typically form two hydrogen bonds.
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in which of the three phases of matter would you expect hydrogen bonding between water molecules to be the strongest?
Hydrogen fluoride, HF has the strongest individual hydrogen bonds between its molecules.
An inorganic substance with the chemical formula HF is hydrogen fluoride. The main industrial source of fluorine is this colorless gas or liquid, which is frequently an aqueous solution known as hydrofluoric acid.
Aluminum, plastics, electrical components, pharmaceuticals, high-octane fuel, fluorescent light bulbs, and refrigerants are all made with hydrogen fluoride. The production of refrigerants uses 60% of the hydrogen fluoride used in manufacturing.
The difference in charge between hydrogen ions that are slightly positive and other hydrogen ions that are slightly negative results in hydrogen bonds, which are electrostatic forces that attract. Hydrogen bonds form between nearby hydrogen and oxygen atoms of adjacent water molecules in the case of water.
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35 g al(s) reacts with excess hcl(aq) according to the chemical equation shown above. what is the volume (in l) of h2 gas produced at a temperature of 345 k and a pressure of 1.12 atm?
35 g al(s) reacts with excess hcl(aq) according to the chemical equation shown above. what is the volume (in l) of h2 gas produced at a temperature of 345 k and a pressure of 1.12 atm?
2Al(s) + 6HCl(aq) ----------------> 2AlCl3(aq) + 3H2(g)
3 moles of H2 produced from 2 moles of Al
3*2g of H2 produced from 2*27g of Al
75g of H2 produced from = 2*27*75/(3*2) = 675g of Al >>>>answer
2Al(s) + 6HCl(aq) ----------------> 2AlCl3(aq) + 3H2(g)
2 moles of Al react with 6 moles of HCl
2*27g of Al react with 6 moles of HCl
4.25g of Al react with = 6mole*4.25g/(2*27g) = 0.472 moles of HCl
no of moles of HCl = molarity * volume in L
0.472 = 5*volume in L
volume in L = 0.472/5 = 0.0944 L = 94.4ml >>>>answer
2Al(s) + 6HCl(aq) ----------------> 2AlCl3(aq) + 3H2(g)
2 moles of Al react with excess of HCl 3 moles of H2
2*27g of Al react with excess of HCl 3 moles of H2
35g of Al react with excess of HCl = 3*35/(2*27) = 1.94 moles of H2
n = 1.94moles
T = 345K
P = 1.12atm
PV = nRT
V = nRT/P
= 1.94*0.0821*345/(1.12) = 49.1 L of H2 >>>>answer
part-D
no of moles of Al = W/G.M.Wt
= 125/27 = 4.63moles
no of moles of HCl = molarity *volume in L
= 3.2*2.5 = 8moles
2Al(s) + 6HCl(aq) ----------------> 2AlCl3(aq) + 3H2(g)
2 moles of Al react with 6 moles of HCl
4.63 moles of Al react with = 6*4.63/2 = 13.89 moles of HCl is required
HCl is limiting reactant
6 moles of HCl react with excess of Al to gives 3 moles of H2
8 moles of HCl react with excess of Al to gives = 3*8/6 = 4 moles of H2
theoretical yield of H2 = no of moles * gram mola rmass
= 4*2 = 8g
A chemical is any substance that has a described composition. In other phrases, a chemical is continually made up of the identical "stuff." a few chemical compounds occur in nature, such as water.
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