Because it always equals the total number of steps in a process, a reactive intermediate.
What is a reaction in science?In a chemical reaction, one or more chemicals, usually known as reactants, change into one or more other compounds, frequently referred to as products. Chemical parts or chemical elements make up substances. A response is a behavior, propensity, or course of action that is different from what was first intended. Decisions are taken in the heat of the moment without much thought or consideration of the potential repercussions. Reaction: Making a declaration in response to another person's action or remark.
What are examples of reactions and what causes chemical reactions?Changes in color, temperature, gas production, or precipitant formation are common outcomes of chemical reactions. Combustion, digestion, and cooking are a few straightforward instances of daily reactions.
Atoms create and break chemical bonds during chemical reactions. Reactants are the molecules that initiate a chemical reaction, and products are the compounds that are created as a result of the reaction.
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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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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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Steel is an alloy containing Fe atoms and C atoms. Which of the following diagrams best represents the particle-level structure of steel?
A
The figure presents a particle diagram consisting of 12 large unshaded circles, which represent C atoms and 6 small shaded circles, which represent F e atoms. The large C atoms are arranged in a 3 by 4 array. The small F e atoms are located throughout this lattice, at every intersection of four large C atoms.
B
The figure presents a particle diagram consisting of 12 large unshaded circles, which represent F e atoms and 6 small shaded circles, which represent C atoms. The large F e atoms are arranged in a 3 by 4 array. The small C atoms are located throughout this lattice, at every intersection of four large F e atoms.
C
The figure presents a particle diagram consisting of 6 unshaded circles, which represent C atoms and 6 shaded circles, which represent F e atoms. The circles are all the same size and are in a 3 by 4 array, alternating between F e atoms and C atoms. Rows 1 and 3 begin with a F e atom, and row 2 begins with a C atom.
D
The figure presents a particle diagram consisting of 6 large unshaded circles and 3 small unshaded circles, which represent C atoms, and 6 large shaded circles and 3 small shaded circles, which represent F e atoms. The large C and F e atoms are in a 3 by 4 array, alternating between F e atoms and C atoms. Rows 1 and 3 begin with a F e atom, and row 2 begins with C atom. The small C and F e atoms are located throughout this lattice, at every intersection of four large atoms. The small atoms alternate between C and F e atoms, such that the first row of intersections begins with a C atom, and the second row of intersections begins with a Fe atom.
Steel is an interstitial alloy made from Carbon and iron atoms. It is usually composed of 98-99% Iron and 1-2% Carbon. The possible answer here will be option B.
As we said Steel is an interstitial alloy, not a substitutional. So option D is not possible. The iron atoms are larger in size, so depicting both Iron and Carbon as equal size is not correct. Thus option c cannot be the structure. Also in the case of option A, if we examine it, the percentage amount and size of the atom will be problematic. This gives us the only possible answer B.
As we said steel is an interstitial alloy, which in a particle level structure will show 12 large iron atoms, arranged in a 3 by 4 array and carbon atoms are present in the intersection of four Iron atoms. Small carbon atoms will be seen throughout the lattice.
So the answer will be option B.
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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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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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See correct question below
Identify the atom oxidized, the atom reduced, the oxidizing agent, and the reducing agent. 2Fe + 3V₂O₃ -------> Fe₂O₃ + 6VO
a solution is made by dissocling 100 grams of colbat(ii) chloride in 250 grams of water to make a solution that has a density of 1.25g/ml. calculate the molality of the solution
100 gram of cobalt and chloride in 250 gram of water to make solution that its density 1.25g/ml then the molarity of the solution will be 2.42m and 2.16 M.
Determine some important information:
Solute = CoCl₃ (molar mass = 165.29 g/m); mass of 100 g
Solvent = Water, mass of 250 g
Solution of mass = mass of CoCl₃ + mass of water
250 gram + 100 gram = 350 gram of solution
If we want to reach a molarity (mol/L), let's determine solution volume with its density:
Solution of density = solution mass / volume of solution
1.25 g/mL = 350 g / volume of solution
Volume of solution = 350 g / 1.25 g/mL = 280 mL
Let's convert the volume into Liter → 280 mL = 0.280L
Let's convert the mass of a solute into moles = 100 g / 165.29 g/m →0.605 mol
Mol/L = 0.605 mol / 0.280 L = 2.16 M
Now let's to calculate the molalilty (mol/kg of solvet)
We must to convert mass of a solvent into kg → 250g = 0.250 kg
Then, 0.605 mol / 0.250 kg =2.42 m
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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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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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what mass of copper would be deposited if a 1.5 a current is passed through an aqueous solution of copper(ii) sulfate for 4.0 minute
0.12g Cu
The rate of flow of charge, measured in amperes, can be represented as coulombs per second.
4.0 minutes x 4.0 min x (60 s / 1 min) x (1.5 coulomb / 1s) x (1 mol e- / 96485 coulomb) x (1 mol Cu / 2 mol e-) x (63.55g Cu / 1 mol Cu) equals 0.1186g Cu.
Approximately 0.12g Cu.
Apply the unit-factor approach as known as dimensional analysis. You can reach the solution with a one-line setup and a series of computations.
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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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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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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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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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From your knowledge about the distribution of electrons in the levels and from the atomic number (in parentheses), indicate the most likely charge on the ion when this atom forms an ion. (Remember the 2, 8, 18 level distribution.)
The most likely charge on the ion when this atom forms an ion O⁻².
Actually any atom tries to reach its nearest noble gas electron distribution, which is 8 electrons in its last shell (2 in case of helium). To achieve the total of 8 electrons in its last shell an atom takes up or gives up electrons.
Like in case of oxygen, it has 6 electrons in its last shell, thus generally takes up 2 more electrons to achieve the electron distribution of noble gas neon(10) and it can be written as O⁻².
Now when an atom takes up electron it becomes electronegative(because of more negative charged entities in it i.e, electrons) and when one gives up electron it becomes electropositive(because of extra positive charged entities in it i.e, proton).
But there can be some extra valencies other than the most stable one(which has the noble gas configuration). For example, oxygen has valencies of +1, +2, -1 other than -2(most stable).
Your question is incomplete most probably your full question was
From your knowledge about the distribution of electrons in their shells and from the atomic number (in parentheses), indicate the most likely charge on the ion when this atom forms an ion. (Remember the 2-8-18 shell distribution.) Oxygen (8) +1 +2 -2 -1
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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.
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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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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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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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.
a chemist measures the amount of hydrogen gas produced during an experiment. she finds that 66.1 g of hydrogen gas is produced. calculate the number of moles of hydrogen gas produced. round your answer to 3 significant digits.
368 g of hydrogen gas is produced. calculate the number of moles of hydrogen gas produced.
Where is hydrogen found?It is found in the sun and most of the stars, and the planet Jupiter is composed mostly of hydrogen. On Earth, hydrogen is found in the greatest quantities as water. It is present as a gas in the atmosphere only in tiny amounts – less than 1 part per million by volume.
What is hydrogen used for?Hydrogen can be used in fuel cells to generate electricity, or power and heat. Today, hydrogen is most commonly used in petroleum refining and fertilizer production, while transportation and utilities are emerging markets.
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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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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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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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An electron is placed just above the surface of the Earth. In which direction (upwards or downwards) must an electric field be applied to keep the electron stationary?
answer choices
upwards
downwards
The Earth's surface is covered with an electron. To maintain the electron immobile, an electric field must always be applied downward.
Who or what is an electron?A negative charge subatomic particle known as an electron can either be free or attached to an atom. One of the three main types nuclear particles within an atom is an ion that is bonded to it; some other two are neutrons and protons.
In how many atoms do electrons consist?For dispassionately charged species, the concentration of electrons within an atom is similar to the atomic weight of an element. This indicates that an element has an equal amount of both protons and electrons. Consequently, oxygen contains 8 electrons.
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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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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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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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A block of granite has a mass of 660 g. It is heated to 155˚C and placed in a container of water at 25˚C. After a few minutes, the temperature of the water has reached a maximum of 88˚C. How many grams of water are in the container?
The mass of water in the container that contains a block of granite of mass 660g is 132.53g.
How to calculate mass using calorimetry?Calorimetry is the science of measuring the heat absorbed or evolved during the course of a chemical reaction or change of state.
The mass of the granite in this question can be calculated using the following formula;
Q = mc∆T
Where;
m = mass c = specific heat capacity∆T = change in temperaturemc∆T (water) = - (mc∆T) {granite}
m × 4.184 × {88 - 25} = - {660 × 0.79 × (88 - 155)
263.592m = 34,933.8
m = 132.53g
Therefore, 132.53g is the mass of the water in the container.
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Energy stored in bonds of molecules is called:
a. chemical
b. nuclear
c. light
d. none of these
Answer:
a. chemical
Explanation:
Chemical energy is energy stored in the bonds of atoms and molecules.
