69.45 ml of 0.0887 m Mgcl2 solution is needed to make 275.0 ml of 0.0224 m Mgcl2 solution
What is the solution?A combination of one or even more solutes that have been dissolved into a solvent is referred to as a solution. To create a homogenous mixture, a solute must be completely dissolve in a solvent.
V1M1 = V2M2
Where,
V1 = volume of first solution = V1
V2 = volume of second solution = 275.0 ml
M1 = molarity of first solution = 0.0887 M
M2 = molarity of second solution = 0.0224 M
On putting values we get -
V1M1 = V2M2
V1 × 0.0887 = 275.0 × 0.0224
V1 = 6.16 / 0.0887
V1 = 69.45 ml
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a sample of an ideal gas at atm and l is allowed to expand against a constant external pressure of atm at a constant temperature. calculate the work in units of kj for the gas expansion.
The work for the gas expansion from a sample of an ideal gas at 15.0 atm and 10.0 L that is allowed to expand against constant external pressure of 2.00 atm at a constant temperature is calculated as 13.2 kJ.
What is Boyle's law?Boyle's law is an experimental gas law that describes relationship between pressure and volume of a confined gas.
Given, Initial pressure = 15.0 atm ; Initial volume = 10.0 L and Final external pressure = 2.00 atm
Using the equation for Boyle's Law ; P₁V₁ = P₂V₂
(15.0 atm × 10.0 L) = (2.00 atm × V₂)
V₂ = (15 * 10)/2
So, V₂ = 75.0 L
change in the volume, ΔV = V₂ - V₁
ΔV = 75.0 L - 10.0 L
So, ΔV = 65.0 L
As, W = -PΔV
P , external pressure = 2.00 atm
W = -(2.00 atm × 65.0 L)
So, W = -130 L. atm
W= -130 * (101.3/1)
W = 13169 J
Hence, W = 13.2 kJ
Therefore, work for the gas expansion is 13.2 kJ
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Note: The question given on the portal is incomplete. Here is the complete question.
Question : sample of an ideal gas at 15.0 atm and 10.0 l is allowed to expand against a constant external pressure of 2.00 atm at a constant temperature. calculate the work in units of kj for the gas expansion.
At what temperature will 24.6 g Cl2 (g) exert a pressure of 652 mmHg when confined in a 8.5 1 L container?
The temperature at which 24.6 g of chlorine gas, Cl₂ will exert a pressure of 652 mmHg when confined in a 8.5 1 L container is -16 °C
How do I determine the temperature?We'll begin by obtaining the number of mole of chlorine gas, Cl₂ in the container. Details below:
Mass of chlorine gas, Cl₂ = 24.6 gMolar mass of chlorine gas, Cl₂ = 2 × 35.5 = 71 g/molMole of of chlorine gas, Cl₂ =?Mole = mass / molar mass
Mole of of chlorine gas, Cl₂ = 24.6 / 71
Mole of of chlorine gas, Cl₂ = 0.346 mole
Finally, we shall determine the temperature. This is shown below:
Pressure (P) = 652 mmHg = 652 / 760 = 0.858 atmVolume (V) = 8.51 L Mole of of chlorine gas, Cl₂ (n) = 0.346 moleGas constant (R) = 0.0821 atm.L/Kmol Temperature (T) =?PV = nRT
0.858 × 8.51 = 0.346 × 0.0821 × T
Divide both sides by (0.346 × 0.0821)
T = (0.858 × 8.51) / (0.346 × 0.0821)
T = 257 K
Subtract 273 to obtain answer in °C
T = 257 - 273
T = -16 °C
Thus, can conclude that the temperature is -16 °C
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When rutherford did the gold foil experiment where most of the particles went through the foil and a few were deflected, how did the model of the atom change?
Alpha particles with a positive charge impacted a piece of gold foil. The majority of alpha particles were damaged-free. This proved that the gold atoms were mostly made of void space. Some particles' paths were bent at acute angles.
What does "positive charge" mean?A substance is considered to have a positive charge if it contains more protons than electrons.
We are aware that protons have a positive charge and electrons have a negative charge.
Positively charged things therefore contain more protons than electrons.
An atom has a positive charge when there are more protons than electrons in it.
While electrons have a negative charge, protons have a positive charge.
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On a hot day, Ava got herself a carbonated beverage. She knew from her science class that carbonated drinks had carbon dioxide in them. When she first opened it, there were lots of bubbles. However, as her drink got warmer, she noticed that there were fewer bubbles in it. Choose the words to finish the sentence correctly. In general, as the temperature increases, the solubility of solids increases , while the solubility of gases increases .
As her drink got warmer, she noticed that there were fewer bubbles in it because as temperature increases, pressure also increases and vice versa.
Why there were less bubbles in the warmer bottle?Using a derivative of the combined gas law we can explain that is happening in both the cases.
Assuming that volume is constant which is predicated on the bottle shape and structure, pressure of a given mass of gas varies directly with absolute temperature.
As temperature increases, pressure also increases and vice versa. The bottle at a higher temperature has a higher pressure of gas and the bottle at lesser temperature has a reduced pressure inside.
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given the following reaction caco3 -> cao co2. if grams of cac03 react to produce 85% yield of carbon dioxide, what would the exprerimental yield be
The experimental yield of carbon dioxide would be 85% of the amount of calcium carbonate that reacted.
What is carbon dioxide?Carbon dioxide (CO2) is a naturally occurring gas composed of one carbon atom and two oxygen atoms. It is the most significant of the greenhouse gases, responsible for about 63% of the total global warming effect. Carbon dioxide is produced by the burning of fossil fuels, through respiration, and is also released during land-use changes such as deforestation. Carbon dioxide is essential to life on earth, as it is a major component of photosynthesis, which helps plants to grow. In the atmosphere, carbon dioxide acts as a blanket that traps infrared radiation, causing the global temperature to rise.
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in which bond would you expect carbon to have a slight negative charge? group of answer choices si - c cl - c o - c none because c always carries a slight positive charge.
The right choice is Si-C. Carbon has a stronger ability to draw electrons to itself because of its higher electronegativity.
What is an electron example?The smallest elemental component of the an atom, the electron seems to have a negatively charged. In a neutral atom, there is an equal number of both electrons and protons. 1 electron and 1 proton are all that the hydrogen atom has. In contrast way, the uranium atom contains 92 protons, which means 92 electrons.
What resides within an electron?The strongest evidence we currently have is that neutrons and protons contain particles. These subatomic particles are known as quarks. The strongest evidence we have also demonstrates that an electron is completely empty inside.
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What is the relationship between the following two molecules? HOH Select one: a. Enantiomers b. Diastereomers c. Identical d. Constitutional Isomers ere to search
The relationship between the two molecules is as shown in the diagram attached which are diasetreomers.
Optical isomers are the stereoisomers that are non superimposable mirror images of each other and differ in the direction with which they rotate plane-polarised light. They are said to be “chiral” (handed) and referred to as enantiomers or enantiomorphs of each other.
An object or a system is chiral if it differs from its mirror image, and its mirror image can not be superimposed on the original object. A molecule can be chiral only if it lacks an improper axis of rotation- that is, a rotation-reflection axis (Sn).
However, molecule can also be considered as chiral if it doesn’t possess a center or plane of symmetry. The later criterion must be applied carefully, because some molecule may lack both center and plane of symmetry but still have superimposable mirror image, means compound is achiral.
Hence, the correct option is B.
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The amount of work done on a heavy box carried by Nellie across a room at a constant speed depends on the distance walked. depends on both weight of the box and distance walked. is none. depends on the weight of the box. none of the above
The amount of work done on a heavy box carried by Nellie across a room at a constant speed depends on both the weight of the box and the distance walked.
Work is a measure of the energy required to move an object, and it is defined as the force applied multiplied by the distance moved. In this scenario, the force is the weight of the box, and the distance is the distance walked by Nellie.
Therefore, the amount of work done on the heavy box is proportional to both the weight of the box and the distance walked. The heavier the box and the greater the distance, the more work Nellie must do to move it.
It's important to note that the speed of the movement doesn't affect the work done, only the amount of time that it takes.
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d. questions: common ion effect on a chemical system fe3 (aq) scn- (aq) [fe(scn)]2 (aq) 1. a. what evidence do you have that the equilibrium shifted when additional iron(iii)chloride was added to the test solution made from iron(iii)chloride and potassium thiocyanate? b. in which direction did the equilibrium shift? explain. c. which ion created the stress on the system that caused the equilibrium to shift? 2. why did the addition of potassium thiocyanate cause the equilibrium to shift the way it did? (which ion caused this shift?) 3. a. which way did the equilibrium shift when excess potassium chloride was added to the test solution? b. why did the addition of potassium chloride cause the equilibrium shift since neither potassium nor chloride ions are common ions to this equilibrium?
Leftward shift in equilibrium The equilibrium will adjust to reduce the impact of a change in a substance's concentration. Reactant concentration will drop if a reactant's concentration is raised because the equilibrium will change in favor of the reaction that utilises the reactants.
What is meant by thiocyanate?a substance made up of the chemical group SCN and an atom or group other than a hydrogen atom. The sulfur atom serves as the bonding agent. The anion [SCN] is thiocyanate. It is thiocyanic acid's conjugate base. The colorless compounds sodium thiocyanate and potassium thiocyanate are typical derivatives. Pyrotechnics once made use of mercury(II) thiocyanate.
Why is thiocyanate used?Thiocyanates serve as additives or starting materials again for synthesis of specific dyes, chemicals, as well as pharmaceuticals, as well as chemical tracers, stabilizers, as well as corrosion inhibitors, among other functions inside the agricultural production, oil field, life science, chemical production, as well as textile industries.
Fe⁺³ (aq) + SCN⁻¹ (aq) —-> Fe (SCN)⁺² (aq)
The point of equilibrium in the aforementioned equilibrium will shift from right to left as the concentration of iron (lll) ion drops.
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what nacl concentration results when 254 ml of a 0.820 m nacl solution is mixed with 642 ml of a 0.400 m nacl solution?
When 254 ml of a 0.820 m NaCl solution and 642 ml of a 0.400 m NaCl solution are combined, 0.05 moles of NaCl are produced.
What applications do NaCl have?To help prevent heat cramps caused on by excessive sweating, sodium chloride is utilized as an electrolyte replenisher. This drug is also employed in the production of a typical tonicity sodium chloride solution.
Why does salt go by the name NaCl?Most frequently, sodium chloride, also known as table salt, is referred to as "salt." Sodium chloride is created through the production of ionic bonds among sodium and chloride ions. There is one sodium ion (Na+) for each and every chloride anion, giving the substance the chemical formula NaCl (Fig (Cl-).
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When 254 ml of a 0.820 m NaCl solution and 642 ml of a 0.400 m NaCl solution are combined, 0.05 moles of NaCl are produced.
What applications do NaCl have?To help prevent heat cramps caused on by excessive sweating, sodium chloride is utilized as an electrolyte replenisher. This drug is also employed in the production of a typical tonicity sodium chloride solution.
Why does salt go by the name NaCl?Most frequently, sodium chloride, also known as table salt, is referred to as "salt." Sodium chloride is created through the production of ionic bonds among sodium and chloride ions. There is one sodium ion (Na+) for each and every chloride anion, giving the substance the chemical formula NaCl (Fig (Cl-).
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what volume of an hcl solution with a ph of 1.3 can be neutralized by one dose of milk of magnesia? If the stomach contains 220 mL of pH 1.3 solution, will all the acid be neutralized?
Milk of magnesia is often taken to reduce the discomfort associated with acid stomach or heartburn. The recommended dose is 1 teaspoon, which contains 4.00×102mg of Mg(OH)2.
One dose of milk of magnesia needs to be neutralized with 0.35 L of HCl at a pH of 1.3
From the pH, we may calculate the hydrogen ion concentration as follows;
pH equals -log[H+]
Antilog: [H+] (-pH)
Antilog = [H+] (-1.3)
[H^+] = 0.0398 M
The reaction equation is now;
Milk of Magnesia with 2HCl leads to MgCl2 plus 2H2O.
Mg[tex](OH_{2} )[/tex] reaction mass is 4.00102mg or 0.4 g.
Mg[tex](OH_{2} )[/tex] moles are equal to 0.4 g/58 g/mol, or 0.00689 moles.
If two moles of HCl and one mole of Milk of Magnesia react, Mg[tex](OH_{2} )[/tex] interacts with 0.00689 moles of 0.00689 moles of 2 moles/1 mole.
equals 0.0138 moles of HCl
Observe that
Number of moles = volume concentration
Volume equals moles times concentration
Volume is 0.0138 moles per 0.0398 M.
Amount = 0.35 L
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According to the VSEPR theory, what molecular geometries are associated with the following types of molecules:
a. AB2
b. AB3
c. AB4
d. AB5
e. AB6
VSEPR theory (Valence Shell Electron Pair Repulsion theory) is a model used to predict the geometric arrangement of atoms in a molecule based on the number of electron pairs around the central atom.
a. AB2: The molecular geometry associated with AB2 molecules is linear. This is because there are two electron pairs around the central atom, which repel each other and cause the atoms to be arranged in a straight line.
b. AB3: The molecular geometry associated with AB3 molecules is trigonal planar. This is because there are three electron pairs around the central atom, which repel each other and cause the atoms to be arranged in a triangular shape.
c. AB4: The molecular geometry associated with AB4 molecules is tetrahedral. This is because there are four electron pairs around the central atom, which repel each other and cause the atoms to be arranged in a tetrahedron shape.
d. AB5: The molecular geometry associated with AB5 molecules is trigonal bipyramidal. This is because there are five electron pairs around the central atom, which repel each other and cause the atoms to be arranged in a shape of a pyramid with a triangular base.
e. AB6: The molecular geometry associated with AB6 molecules is octahedral. This is because there are six electron pairs around the central atom, which repel each other and cause the atoms to be arranged in a shape of an octahedron.
It's worth noting that, VSEPR theory is a model and it provides a theoretical framework to predict the molecular geometry, but it doesn't account for other factors that can affect molecular geometry, like the presence of lone pairs or multiple bonding, among others.
a.[tex]AB_2[/tex]: The molecular geometry is linear. b. [tex]AB_3[/tex]: The molecular geometry is trigonal planar. c. [tex]AB_4[/tex]: The molecular geometry associated is tetrahedral. d. [tex]AB_5[/tex]: The molecular geometry is trigonal bipyramidal. e. [tex]AB_6[/tex]: The molecular geometry is octahedral.
The three-dimensional arrangement or structure of molecules in space is referred to as molecular geometry. It defines the spatial arrangement of the constituent atoms in a molecule in relation to one another. Many of a molecule's chemical and physical properties are governed by its atom arrangement. Because it has a substantial impact on how a molecule is polar, reactive, and able to interact with other molecules, molecular geometry is important. It is crucial for comprehending how molecules behave and interact during many chemical processes, including the creation of bonds, chemical reactions, and even biological activity. a.[tex]AB_2[/tex]: The molecular geometry is linear. b. [tex]AB_3[/tex]: The molecular geometry is trigonal planar. c. [tex]AB_4[/tex]: The molecular geometry associated is tetrahedral. d. [tex]AB_5[/tex]: The molecular geometry is trigonal bipyramidal. e. [tex]AB_6[/tex]: The molecular geometry is octahedral.
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the epa limit for lead in the water supply is 15 parts per billion by mass (15 g pb / 1 x 10 9 g h 2o). calculate the number of lead ions present in 1.00 kg of water that is at the epa limit for lead. assume the mass of a lead ion and atom are the same.
The number of lead ions in 1 kg of water at 15 ppb on a weight basis is found to be 4.3623 x 10^16.
How to calculate the amount of lead ion present in water?According to Avogadro's number, a mole is 6.02 x 10E23 ions or molecules.One mole of water weighs 18 g because water has a molecular weight of 18.1000/18 moles are equal to 1 kilogramme of water.The quantity of water molecules in 1 kilogramme is calculated by multiplying 1000/18 moles by Avogadro's number (6.0210 to the 23rd);Currently, lead has a molecular weight of 207, whereas water's is only 18. Consequently, one lead ion weighs 207/18 water molecules.Since we are using a weighted average, the quantity of lead ions in 1 kilogramme of water at 15 ppb is (water molecules in 1 kg) X 15/1 billion X (18/207).What is the parts per million measurement?
The amount of units of mass of a contaminant per million units of total mass is known as parts per million (ppm).
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select the correct answer. james needs 4.20 moles of nabr for an experiment. how many grams of nabr must he measure out to have 4.20 moles? a. 24.5 b. 103 c. 183 d. 432
James need 385.862 g of mabr to have 4.2 moles of nabr for an experiment. The provided options were incorrect.
How to calculate the mass of nabr required for an experiment from the given moles?moles = grams / molar mass
the molar mass of NABR => 92.01 g/mol;
grams = moles x molar mass:
grams = 4.20 moles x 92.01 g/mol = 385.862 g.
What is molecular weight?The term "molecular weight" indicates the mass of a specific chemical molecule. It is determined by integrating the atomic weights of all the atoms in the molecule and is often reported in grammes per mole (g/mol) units. A substance's molecular weight can be used to identify it, comparing its properties to those of other compounds, and estimate the quantities of reagents required for a chemical reaction.
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Answer:
D. 432
Explanation:
NaBr has a molecular weight of 102.894 g/mol
102.894 g/mol x4.2=432.1548 g/mol
an aqueous vitamin c (c6h8o6) solution must be created for an experiment. if 250.00 ml of a 9.54 x 10-3 m solution is needed, what amount of vitamin c (in grams) must be weighed out? only input numbers. your answers must be expressed to the thousandths place. any values less than one must have a zero in front of the decimal (e.g. 0.01 not .01)
Does a decimal have to have a zero before it Numbers between 0 and 1 stated as decimals in most nations other than the United States include a zero before the decimal point (for example, 0.64 or in many nations, 0,64) however in the United States this zero is frequently deleted ( 64)
In order to set an example and achieve net-zero emissions from national government operations by no later than 2050 the United States introduced the Net-Zero Government Initiative at the United Nations Climate Change Conference of the Parties (COP27) in 2022 John Kerry the U.S Special Presidential Envoy for Climate, and Brenda Mallory the Chair of the Council on Environmental Quality made the announcement at a COP27 gathering with partner nations Australia, Austria Belgium Canada Cyprus Finland, France, Germany Ireland, Israel Japan Korea Lithuania Netherlands, New Zealand Singapore Switzerland, and the United Kingdom are among the nations that have joined the United States in pledging to have net zero government emissions
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C. If you were to measure out 0.0237 moles of potassium nitrate into a clear, dry cup. How
many grams are in this sample? Show your work in the space below.
Molar mass of KNO3:.
If you were to measure out 0.0237 moles of potassium nitrate into a clear, dry cup. 2.4 grams are in this sample. Molar mass of KNO₃ is 101.11g/mol.
What is molar mass ?The term molar mass is defined as the mass in grams of one mole of the compound.
Molar mass of KNO₃ = 39.10 + 14.01 + 16 (3)
= 101.11g/mol
Mass (m) = ?
Molar mass (M) = 101.11g/mol
Number of moles (N) = 0.0237 moles
n = m / M
m = 0.0237 × 101.11
= 2.4 grams
Thus, If you were to measure out 0.0237 moles of potassium nitrate into a clear, dry cup. 2.4 grams are in this sample. Molar mass of KNO₃ is 101.11g/mol.
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Which piece of lab equipment would be most useful for the following task: Heat a beaker of water when a gas line is not available to power any equipment?
answer choices
Hot plate
Digital scale
Beaker
Mortar and pestle
To heat a beaker of water when a gas line is not present we can use hot plate instead in the given scenario.
In the laboratory, hot plates are frequently used for a variety of tasks, including heating samples and conducting chemical reactions. The idea of a hot plate is straightforward: it is a flat surface with heating elements. They are suitable for use in oil or sand baths and do not produce open flames. When heating samples, the hot plate system with a stirrer offers greater temperature uniformity. For precise temperature heating in chemistry and biology, a laboratory hot plate is typically used. Use aluminium plates if you need to work with temperatures between 300 and 400 degrees Celsius as your maximum required working temperature.
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all restaurant kitchens are equipped with what kind of systems that release wet chemicals directly over the source of the fire when smoke is detected?
Every restaurant kitchen has a hood suppression system that, when smoke is detected, releases wet chemicals over the fire's source.
Wet chemical method: what is it?Wet chem is a type of analytical methods that examines materials using traditional techniques like observation. Wet chemistry is the term used to describe the majority of analysis, which takes place in the liquid phase. Because many tests are carried out at lab benches, wet chemistry is sometimes known as bench chemistry.
Wet chemical agents: what are they?Chemical wet The extinguishing agent may consist of water in solutions with potassium dichromate, potassium carbonate, potassium lactate, or a combination of these compounds, but this is not a requirement (which are conductors of electricity). The pH of the liquid agent is normally 9.0.
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Write an equation to calculate the salinity given x as the percent of salt in a sample
Salinity (ppt) = 0.0018066 5 Cl- (mg/L) is a relationship that can be used to calculate salinity. the conductivity data to a salinity value under the presumption that the majority of the ions in the solution are non-carbonate salt ions (e.g., Na+, K+, or Cl-).
What are salinity and salt content, respectively?Approximately 3.5% of the weight of seawater is made up of dissolved salts due to the salinity, or salt concentration, of saltwater, which is 35 parts per thousand. The weight of salt (as sodium chloride) in a cubic mile of saltwater is equivalent to around 120 million tons.
What does a percentage of saltiness mean?The quantity of dissolved salts in water is measured as salinity. The standard units of measurement are parts per thousand (ppt) and percentage (%). Riverine freshwater has a salinity of 0.5 ppt or less.
Why is there 40% salinity, exactly?A solution of water and salt with a salinity of 40% is created by dissolving 40 grams of salt in 100 grams of water.
x ppt = x grams salt/ 1000 grams seawater
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phosphoric acid (h3po4) can give up three protons, each with different pka values consisting of 2.12, 7.21, and 12.67. if plotting ph as a function of sodium hydroxide solution added, which titration curve represents the neutralization of a solution of phosphoric acid with an initial ph of 1.0?
The equivalence point of the titration would occur when all three protons have been neutralized and the pH of the solution becomes neutral (around 7).
What is titration curve?Titration curves provide graphical depictions of titration analyses. Scientists first measure a property of the analyte solution (usually pH for acid-base titrations). Then, they plot this property against the volume of the titrant added.
Phosphoric acid (H3PO4) is a triprotic acid, which means it can donate three protons (H+) with different acid dissociation constants (pKa) values. The pKa values for phosphoric acid are 2.12, 7.21, and 12.67.
In the first region, the initial pH of the phosphoric acid solution is 1.0, which corresponds to the first proton dissociation (pKa = 2.12). As NaOH is added, the pH of the solution increases rapidly as the first proton is neutralized.
In the second region, the pH of the solution increases more slowly as the second proton (pKa = 7.21) is neutralized.
In the third region, the pH of the solution increases even more slowly as the third proton (pKa = 12.67) is neutralized.
The equivalence point of the titration would occur when all three protons have been neutralized and the pH of the solution becomes neutral (around 7).
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an equilibrium constant of 900 indicates: group of answer choices there are the same amount of reactants and products at equilibrium there are more products than reactants at equilibrium the reaction is not at equilibrium there are more reactants than products at equilibrium
an equilibrium constant of 900 indicates: there are more products than reactants at equilibrium.
What is an equilibrium constant?The ratio of reactant to product amounts that is used to predict chemical behaviour is the definition of the equilibrium constant for a chemical process. In a state of equilibrium, the forward reaction rate equals the backward reaction rate.
K-values are crucial because it gauge the amount of heat that is transferred between an interior and outside of a structure. This is something that is really essential to know may have varying K-values due to the variety of materials are employing.
For general reaction, A + B ⇄ C + D
Thus, Keq = [C] [D] / [A] [B]
Once equilibrium is achieved, the product of the product concentrations is larger than that of the product of the reactant concentrations.
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TuN OF POINTS
Water has many unique properties, such as cohesion, adhesion, high boiling point, and high surface tension. Which of the following explains why water has these properties?
dipole-dipole interactions within the water molecule
covalent bonds between the oxygen of one molecule and the hydrogen of another molecule
attraction between the partial charges on separate water molecules
covalent bonding between oxygen and hydrogen within water molecules
Answer:
Covalent bonding between oxygen and hydrogen within water molecules.
Identification of the phenolic compounds contributing to antibacterial activity in ethanol extracts of Brazilian red propolis
Red propolis is a complex bee product. It is a resin produced by Apis mellifera bees and studies show that they have various beneficial properties.
The extraction of compounds can be done using water or ethanol. The components extracted depend upon the solvent used. Red propolis has characteristic phenolic compounds. They seem to have a wide range of activity from antibacterial to antifungal to antioxidant properties. The most activity was shown in extracts using aqueous solutions of ionic liquids or eutectic solvents.
The main compounds found in Red propolis are daidzein, formononetin, biochanin, medicarpin, neoflavanoids, chalcones, and flavonols, the characteristic red color of the product is due to pigments called retusapurpurins. Extracts having a high content of flavonoids shows high antioxidant activity. Extracts seem to have effects on commonly encountered cocci and Gram-positive rods, such as human tubercle bacillus, but only limited activity against Gram-negative bacilli.
So Brazilian red propolis seems to affect Gram-positive rods and commonly seen cocci.
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3. Find the period 2 elements (atomic numbers #3-10) and the period 3 elements (#11 - 18). Do period 2 and period 3 have the same trend?
4. Examine your graph. Find the group 1 elements (atomic numbers #1, 3, 11, and 19). What happens to atomic radius as you move down the group?
5. Do you see this same trend in group 18 elements (# 2, 10, 18)?
need help with these 3 questions please !!
The period 2 elements which have atomic numbers 3-10 are Lithium (Li) and fluorine (F). The period 3 elements which have atomic number 1 - 18 are Sodium (Na) and Argon (Ar). The Period 3 elements have the highest electron affinities than period 2 elements.
What is an element ?The term element is defined as a substance that cannot be broken down into a simpler substance. They are differentiate by a unique atomic number.
The term atomic radius is defined as the distance from the atom's nucleus to the outermost shell of the electron cloud. The atomic radius decreases along with a period and increases down a group.
1 element which have atomic numbers 1, 3, 11, and 19 are alkali metals. Members of group 18 have eight valence electrons in their orbit.
Thus, The period 2 elements which have atomic numbers 3-10 are Lithium (Li) and fluorine (F).
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S + 6 HNO3 → H2SO4 + 6 NO2 + 2 H2O In the above equation, how many grams of water can be made when 168.3 grams of HNO3 are consumed?
Since the molar mass of water is 18.02 grams, then the amount of water that can be produced is 2 × 18.02 = 36.04 grams. This means that when 168.3 grams of HNO3 is consumed, 36.04 grams of water can be produced.
The reaction equation also shows that 6 moles of HNO3 are needed to create 1 mole of water. This means that for every 6 grams of HNO3 consumed, 1 gram of water can be produced. Therefore, when 168.3 grams of HNO3 are consumed, 168.3/6 = 28.05 grams of water can be produced.
In order to calculate the number of grams of water that can be produced from a given amount of HNO3, it is important to know the molar mass of both the reactants and the products. This is because the molar mass can be used to convert the amount of reactant into the amount of product. In the equation given above, when 168.3 grams of HNO3 are consumed, 36.04
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Silver nitrate has a lattice energy of -820. kJ/mol and a heat of solution of +22.6 kJ/mol Delta hydration = ___________ kJ/mol
Silver nitrate has a heat of hydration of -797.4 kJ/mol.
What is heat of hydration?The heat produced when water reacts with cement powder in contact is known as the heat of hydration. The cement composition, curing temperature, water to cement ratio, and cement fineness all affect how much heat is released. The amount of energy generated during the hydration process of one mole of ions is known as the heat of hydration. It is a particular kind of dissolution energy, and water is the solvent. The heat of hydration is a crucial component of mass concrete (ACI 207.1R). In order to reduce cracking, measures must be taken to deal with the heat generated during the hydration of the cement and the resulting volume change. Mass concrete is any volume of concrete with dimensions large enough to necessitate such measures.
Here,
In the case of silver nitrate, the heat of hydration is -797.4 kJ/mol.
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List three things, other than the name, symbol, atomic number, and average atomic mass, you can discover about an element using the periodic table in Figure 6.9.1. Electrons in each energy level
2. Representative/Transition metals
3. What state of matter the element is in
The three things are the number of protons, neutrons, and electrons that can be discovered about an element using the periodic table.
The protons, neutrons, and electrons are the three primary atomic particles. The quantity of protons in an atom is indicated by its atomic number. This is what distinguishes one element from other elements. While maintaining its elemental nature, an atom can gain or lose electrons or neutrons. A period table gives u information about the number of protons by telling you the atomic number. Hence, number of electrons and neutrons can also be discovered.
The tabular arrangement of all chemical elements according to their individual atomic numbers is known as the periodic table. The horizontal rows and vertical columns of the periodic table are referred to as "periods" and "groups," respectively.
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what is the oxidizing and reducing agent in 2fe 3v2o3 à fe2o3 +6vo
The element Fe is the reducing agent (since it is said to be oxidized to Fe₂O₃ ) while V₂O₃ is the oxidizing agent (since it is decreased )
What is the oxidizing agent?The atom oxidized is Fe, the atom reduced is V, the oxidizing agent is V₂O₃ and the reducing agent is Fe.
Iron (Fe) is being oxidized, meaning it is losing electrons and increasing in oxidation state. In this reaction, it goes from zero to +3 oxidation state. On the other hand, Vanadium (V) is being reduced, meaning it is gaining electrons and decreasing in oxidation state. In this reaction, it goes from +5 oxidation state to +2.
Therefore, V₂O₃ is the oxidizing agent, meaning it is the substance that is accepting electrons from the iron and increasing its oxidation state. Meanwhile, Fe is the reducing agent, meaning it is the substance that is donating electrons to the vanadium and decreasing its oxidation state.
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Identify the atom oxidized, the atom reduced, the oxidizing agent, and the reducing agent. 2Fe + 3V₂O₃ -------> Fe₂O₃ + 6VO
ou found an unknown substance and it is green-blue in color, it is a solid, and is not malleable. the unknown substance has a melting point of 24.3 oc and a density of 5.621 g/m3. the unknown sample is flammable and reacts with oxygen gas to form an oxide. how many physical properties are described in the scenario?
The following physical properties of the unknown substance are described in the scenario: Color: green-blue, State: solid, Malleability: not malleable, Melting point: 24.3 oC, Density: 5.621 g/m3 and Flammability: flammable.
Therefore, six physical properties are described in the scenario.
What do you mean by physical properties of chemical substance?Properties that can be defined without altering the arrangement of a substance are known as physical properties. Features such as melting point, boiling point, density, colour, solubility, odor, etc. are physical properties.
What do you mean by the chemical properties of a substance?A chemical property is a feature of a substance that may be observed when it takes part in a chemical reaction. Examples of chemical properties include flammability, chemical stability, toxicity, and heat of combustion.
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Predict the products when 1-propanol is heated in the presence of an acid? There are two products. I have one of them 1-propene, what is the second product?
When 1-propanol is heated in the presence of an acid, the reaction produces two products: 1-propene and water.
This reaction is known as an ether cleavage, and it is commonly used in the production of propene and other hydrocarbons.
It is an exothermic reaction, meaning that the heat generated from the reaction increases the rate of the reaction.
The other product of this reaction is water, which is produced when hydrogen from the 1-propanol molecule is removed and replaced with a hydroxyl group.
This reaction is an example of an acid-catalyzed dehydration, where an alcohol molecule is converted into an alkene molecule by the removal of the OH group and the addition of a hydrogen atom from the acid. The overall reaction is: C3H7OH + H2O → C3H6 + H3O+.
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