The flask's partial oxygen pressure is 0.78 atm. 1.72 x 102 mol, -0.21 x atm, and -6.38 x 102 mol
What is the atmosphere of Earth?Vision Learning, a website for learning, claims The composition of the Earth's atmosphere is roughly 78% nitrogen, 21% oxygen, 0.93% argon, 0.04% carbon dioxide, and trace amounts of neon, helium, methane, krypton, ozone, hydrogen, and water vapor.
How do you define atmosphere in a sentence?As it made contact with Earth's atmosphere, the spacecraft broke apart. 2 They were unhealthyly cramped in their living conditions. 3 The ambiance there strikes me as being somewhat impersonal. 4 The environment in towns and cities is contaminated by these pollutants.
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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 phenol group activates benzene ring for electrophilic aromatic substitution in the ortho (adjacent carbons) and para (opposite carbons) ring positions over substitution at the meta (two carbons away) positions. Identify the substituted phenol compound that has both ortho and meta substitution.
A substituted phenol compound that has both ortho and meta substitution is 2-nitrophenol.
What is phenol compound?Phenol (also known as carbolic acid) is a C6H5OH aromatic organic compound. It's a volatile white crystalline solid. A phenyl group (C6H5) is bonded to the a hydroxy group (OH) in the molecule. It is mildly acidic and must be handled with caution since it may cause chemical burns.
Phenol was originally extracted from coal tar but is now produced on either a large scale (approximately 7 billion kg/year) from oil feedstocks. As a forerunner to too many materials but instead useful compounds, it is a valuable industrial commodity.
The nitro group (-NO2) is an activating and ortho/para-directing substituent, which will direct the electrophile to the ortho and para positions. The nitro group is also a meta-directing substituent, which will direct the electrophile to the meta position.
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limestone contains the ionic compound calcium carbonate (caco3), which reacts with hcl to form the ionic compound calcium chloride, water, and carbon dioxide. (caco3 has a molar mass of 100 grams/mol) (calcium ion is ca 2 , chloride is cl-) a). write the balanced equation. (what is the new ionic compound?
The following chemical reaction occurs when hydrochloric acid and calcium carbonate come into contact: CaCO3 + 2HCl → CaCl + CO2 + H2O, providing acid neutralization as well as byproduct production. Carbon dioxide is the new ionic component as a result.
What is the use of calcium carbonate?Whenever the levels of calcium consumed through food alone is insufficient, calcium carbonate is used as a dietary supplement. The body needs calcium for strong bones, muscles, a healthy neurological system, and a healthy heart. In addition to being an antacid, calcium carbonate is used to treat stomach discomfort, heartburn, and acid indigestion.
What is calcium carbonate made of?The chemical compound calcium carbonate, with the formula CaCO3, is created when carbon, oxygen, & calcium come together. It is a common mineral found in rocks all over the world, most notably as limestone, and it is the main component of marine animal shells, snail shells, coal balls, pearls, or eggshells.
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For the reaction C + 2H2 → CH4, how many moles of carbon are needed to make 163.1 grams of methane, CH4?
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 10.16moles of carbon are needed to make 163.1 grams of methane.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.
C + 2H[tex]_2[/tex] → CH[tex]_4[/tex]
moles of methane= 163.1 grams/ 16.04
=10.16moles
the mole ratio between carbon and methane is 1:1
Mole of carbon = 10.16moles
10.16moles of carbon are needed to make 163.1 grams of methane.
Therefore, 10.16moles of carbon are needed to make 163.1 grams of methane.
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a sample of an ideal gas at 1.00 atm1.00 atm and a volume of 1.69 l1.69 l was placed in a weighted balloon and dropped into the ocean. as the sample descended, the water pressure compressed the balloon and reduced its volume. when the pressure had increased to 50.0 atm,50.0 atm, what was the volume of the sample? assume that the temperature was held constant.
As the sample descended, a weighted balloon carrying an ideal gas sample with a capacity of 1.7 L and an atmospheric pressure of 1.00 atm was released.
At 0°C and 1 atm, what is the density of 60 ml of ideal gas?22.41 L/mol
At STP (Std Pressure and Temperature = 0 °A and, 1 atm), how big is one mole of a thermodynamic ,equilibrium? Therefore, at STP, an ideal gas has a volume of 22.41 L/mol. The least important and most widely remembered chemical number is 22.4 L.
What does Boyle's law say 1 atm is?760 mm Hg equals 1 atm. However, the Pascal is the accepted pressure measurement unit around the world. 1 atm Equals 101325 Pa. Robert Boyle, an English scientist, carried out.
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Justify that electrochemical methods depends upon electrochemical cells?
For conducting chemical reactions, electrochemical methods rely on electrochemical cells to supply the necessary voltage and current.
How are electrochemical cells dependent on them?
Electrochemical cells, which are machines that use electricity to move ions from one electrode to another, are the foundation of electrochemical methods. I
In an electrochemical cell, a voltage source provides the energy required to move the ions while also driving their motion. A chemical reaction between the electrodes and the ions is sparked by this energy, and the result is a current.
The concentration of the electroactive species in the solution is then determined using the current generated. As a result, electrochemical cells are necessary for electrochemical methods. Chemical reactions can also be used to create energy in electrochemical cells.
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Classify each process by its individual effect on the entropy of the universe, S.
Drag the appropriate items to their respective bins: Increases S of the Universe, Does not Affect S of the Universe, Decreases S of the Universe.
a process run infinitesimally slowly at equilibrium and reversed to its original state
a constant composition mixture of solid and liquid water at STP (273.15 K and 1 atm)
motion of a frictionless pendulum
a bag of red marbles and a bag of green marbles dumped together on a table top
ice melting to water above the melting point
sublimation of naphthalene
(mothballs)
Entropy is a measure of disorder, so it follows that as molecular randomness rises, entropy will as well.
What is Entropy?Entropy is a measurable physical characteristic and a scientific concept that is frequently connected to a state of disorder, randomness, or uncertainty. Entropy is the measurement of the amount of thermal energy per unit of temperature in a system that cannot be used for productive work. Entropy is a measure of a system's molecular disorder or randomness because work is produced by ordered molecular motion. Ice melting is the ideal illustration of entropy. The individual molecules are arranged and fixed as ice.
Here,
The processes that have no impact on the universe's entropy are as follows:
1. A process that was run infinitesimally gradually until it reached equilibrium and then reversed.
2. A mixture of solid and liquid water with a constant composition, at standard pressure and temperature.
3. a frictionless pendulum swinging back and forth.
The processes that increase the universe's entropy are as follows:
1. A tabletop covered with a bag of green marbles and a bag of red marbles.
2. Above the melting point, ice melts into water.
3. Slowly converting into oxygen and water is hydrogen peroxide.
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Does not Affect S of the Universe .Part A), B) and C) are included .
What is Entropy?Entropy is a measurable physical characteristic and a scientific concept that is frequently connected to a state of disorder, randomness, or uncertainty. The quantity of temperature energy produced per unit of warmth in an unit that cannot be put to use in a useful way is measured as entropy. Entropy is a measure of a system's molecular disorder or randomness because work is produced by ordered molecular motion. Ice melting is the ideal illustration of entropy. The individual molecules are arranged and fixed as ice.
Does not Affect S of the Universe
a process with a fixed composition of liquid and solid water at STP that is performed insignificantly slowly at harmony and then reverted to its initial condition (273.15 K and 1 atm)
motion of a frictionless pendulum
Increases S of the Universe
a bag of red marbles and a bag of green marbles dumped together on a table top
above the melting point, ice melts to water.
sublimation of naphthalene
Entropy rises when molecular randomness does as well.
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The complete Question :
Classify each process by its individual effect on the entropy of the universe, S.
Drag the appropriate items to their respective bins: Increases S of the Universe, Does not Affect S of the Universe, Decreases S of the Universe.
A) a process run infinitesimally slowly at equilibrium and reversed to its original state
B) a constant composition mixture of solid and liquid water at STP (273.15 K and 1 atm)
C) motion of a frictionless pendulum
D) a bag of red marbles and a bag of green marbles dumped together on a table top
E) ice melting to water above the melting point
F) sublimation of naphthalene
(mothballs)
when you see two consecutive carbon atoms in a protein backbone structure how would you determine which one is the alpha carbon? provide at least two
1. Look for neighboring atoms and determine which carbon is connected to a hydrogen atom. The carbon connected to the hydrogen atom is the alpha carbon.
What is atom?Atom is an open-source, cross-platform code editor developed by GitHub. It is a hackable text editor for the 21st century, built on Electron, and based on everything developers love about Sublime Text, Visual Studio Code, and more. Atom is designed to be a tool for developers, with many features and packages for customizing the interface, editing code, and debugging code. It is also designed to be customizable and extensible, allowing developers to create their own packages and themes for Atom, as well as use existing packages and themes from the community.
2. Look for the presence of a nitrogen atom in the neighboring atoms. The carbon atom connected to the nitrogen is usually the alpha carbon.
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4. After 15 minutes, another solution is added to the reaction flask and the % Transmittance returns to 100%. Did another reaction take place? Please explain your answer.
Based on the graph and the information provided, it can be stated another solution took place as there is a change in the properties of the substance.
What is transmittance?The word "transmittance" refers to the ratio or in this case the percentage of light that can pass through a substance of object. This concept implies that if the tranmittance is 100% is beceuse 100% of the light is passing through the sample and 0% is of the light is being absorbed by it. In the same way if the transmittance is 20% is because the solution has likely become more dense and 80% of the light is being absorbed.
What happened if the transmittance returns to 100%?Considering the transmittance is directly related to concentration and density if there is a big change in the transmittance such as this returning to 100% it is likely because there was a chemical reaction that changed the properties (density) or concentrion of the sample.
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Find pH in the following solution if their [H^+] concentration is : a) [5x10^-9 ml/dm^3]
Answer:
pH= 8.30
Explanation:
The pH of the solution with a [H+] concentration of 5x10-9 ml/dm^3 is 8.30. This can be calculated using the pH to H⁺ formula: pH=−log([H+]). Substituting the given [H+] concentration, we get: pH = −log(5x10-9) = 8.30.
When sodium is heated, a yellow spectral
line whose energy is 3.37 x 10-19 j per photon is
produced
what is the frequency of this light?
explain please
Sodium is heated, a yellow spectral line whose energy is 3.37 x 10-19 j per photon is produced. The frequency of this light is 5.08 x 10^14 Hz
The frequency of light can be calculated using the equation: frequency (ν) = energy (E) / Planck's constant (h).
In this case, the energy of the photon is given as 3.37 x 10^-19 Joules, and Planck's constant is approximately 6.63 x 10^-34 Joules seconds.
So the frequency of this light would be:
ν = E / h
= (3.37 x 10^-19 Joules) / (6.63 x 10^-34 Joules seconds)
= 5.08 x 10^14 Hz
This is a very high frequency, which corresponds to a very short wavelength, in the ultraviolet range of the electromagnetic spectrum.
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which findings on capnography indicate the normal movement of carbon dioxide through the respiratory system?
According to capnography research, EtCO2 is part of the normal flow of carbon dioxide through the respiratory system.
What capnography results show what is normal?End-tidal carbon dioxide, a parameter used in capnography, quantifies ventilation (EtCO₂). The pressure unit mm Hg (millimeters of mercury) is used to measure EtCO₂ values. No matter the patient's age, gender, race, or size, the normal values fall between 35 and 45 mm Hg, or around 5% CO₂.
When a patient has a high EtCO₂ reading at the beginning of treatment, a drop in that reading signifies improvement. If there is no change or an increase in EtCO₂, it means that respiratory effort is still insufficient to sufficiently remove CO₂ and that additional interventions are required.
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Define each of the following as atomic element, molecular element, ionic compound, or molecular compound.
A chemical substance that can be divided up into smaller, simpler components is referred to as a compound. They are composed of two or more elements bound together by fixed-strength chemical bonds.
Define and provide an example for each of the following: atomic element, molecular element, ionic compound, molecular compound?An atomic element is defined as a pure substance that has atoms having the same number of protons and neutrons. They can not break further into smaller elements. For example, O, N, C, etc.Molecular elements can be formed by combining two or more elements (they may or may not be the same) by very strong interactions that behave as a single particle. For example, NH3, C6H12O6, etc.When cations (positively charged ions) and anions are combined, they produce an ionic compound (negatively charged ions). The full transfer of electrons can result in the formation of the ionic connection between metals and non-metals. NaCl, LiF, NaF, LiBr, etc. are a few examples.Molecular compounds are formed by the combination of two or more non-metals by sharing electrons between the atoms. The covalent bonds are present in the molecular compounds. For example, H2O, CO2, SF6, etc.Learn more about atomic element refer to :
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sort the following chromium compounds by whether the cation is chromium(ii) or chromium(iii). Drag each item to the appropriate bin. View Available Hint(s) Reset Help Cris CrBry Cro CIN Cross CrsP Chromium(II) Chromium(111)
The order of chromium compounds based on their cations:
CrI₃ - Cr is + 3 (III)CrBr₂ - Cr is + 2(II)CrO = Cr is + 2(II)CrN - Cr is +3 (II)Cr₂S₃ - Cr is + 3 (III)Cr₃P₂ - Cr is +2 (II)Cations are ions that have a positive charge due to the retention of electrons to achieve a level of stability according to the duplet and octet rules. An anion is an ion that has a negative charge due to the binding or acceptance of electrons to achieve a level of stability according to the duplet and octet rules.
When viewed from the atoms/elements that compose them, Anions and Cations can be divided into 2, namely:
Monoatomic Anions and Cations, namely ions formed from only one element, for example, Ka+ cations or Cl- anions.Polyatomic Anions and Cations, namely ions formed from several elements or atoms. For example, SO42- anion or NH4+ cationChromium (3+) is a monoatomic trication and chromium cation.
Chromium (2+) is a monoatomic cation, a chromium cation, and a divalent metal cation.
complete question sees the picture.
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For cis-1,3-dimethylcyclohexane, which structures represent the possible boat conformations?- a- b- c- d
The structures in option A and D correctly represents structure of cis-1,3-dimethyl cyclohexane.
How does cyclohexane confirmation take place?There are three stable conformations of cyclohexane. Chair, boat, and twist boat are them. The chair conformation is the most stable of the three. Each carbon atom in the cyclohexane's boat shape has two different sorts of groups. Both axial and equatorial groups describe them. From the provided boat conformations, we should determine the cis conformations.
Two substituents are in up, up (or) down, down to each other in boat conformation if they are cis to one another. Two substituents are in up, down, or down, up to each other in boat conformation if they are trans to one another.
In boat conformation A, both methyl groups are in up direction.
In boat conformation-B and C, one methyl group is in up direction and other one is in down direction.
In boat conformation D, both methyl groups are in down direction.
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The complete question is as follows :
For cis-1,3-dimethylcyclohexane, which structures represent the possible boat conformations?- a- b- c- d:
Consider the following reaction:
2Ca(s)+O2(g) → 2CaO(s)
ΔH∘rxn= -1269.8 kJ; ΔS∘rxn= -364.6 J/K
Assume that all reactants and products are in their standard states.
A. Calculate the free energy change for the reaction at 35 ∘C.
Express your answer using four significant figures.
B. Is the reaction spontaneous?
The free energy change for the reaction at 35 ∘C is -1157.45 KJ
Gibbs free energy also termed as the Gibbs energy as well as free enthalpy, or Gibbs function is a quantity which is also used to measure the maximum amount of work done in thermodynamic system when the pressure and temperature are kept constant.
Formula of Gibb's free energy is as follows:
ΔG = ΔH -TΔS
ΔH =1269.8 kJ
ΔS= -364.6 J/K
T = 35ºC = 308.15
ΔS = x 0.001 = 0.3646
ΔG = 1269.8 kJ -(308.15x-0.3646)
ΔG = -1157.45 kJ
Therefore, it is a spontaneous process.
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0.25 moles of a gas at 760 mmHg
and 298 K are contained in a 6.1 L
bottle. What is the pressure of the
system if the amount of gas in the
bottle is reduced to 0.13 mole and
the temperature is reduced to 100 K?
The pressure of the system, when the amount of gas is reduced to 0.13 mole and the temperature is reduced to 100 K, can be calculated using the combined gas law. The pressure of the system is approximately 277.28 mmHg.
1. Identify the given values:
Initial amount of gas (n1) = 0.25 moles
Initial pressure (P1) = 760 mmHg
Initial temperature (T1) = 298 K
Initial volume (V1) = 6.1 L
Final amount of gas (n2) = 0.13 moles
Final temperature (T2) = 100 K
2. Apply the combined gas law, which states:
(P1 * V1) / (n1 * T1) = (P2 * V2) / (n2 * T2)
3. Plug in the values into the formula:
(760 mmHg * 6.1 L) / (0.25 moles * 298 K) = (P2 * 6.1 L) / (0.13 moles * 100 K)
4. Rearrange the equation to solve for P2, the final pressure:
P2 = [(760 mmHg * 6.1 L) * (0.13 moles * 100 K)] / [(0.25 moles * 298 K)]
5. Perform the calculations:
P2 = (466.76 * 13) / (74.5)
P2 ≈ 277.28 mmHg
6. The pressure of the system, when the amount of gas is reduced to 0.13 mole and the temperature is reduced to 100 K, is approximately 277.28 mmHg.
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OSMOSIS - DIRECTION AND CONCENTRATION GRADIENTS Hypothesis. Scientific Reasoning Attach TWO images showing initial experiment setup and final results Data Tables Table 6: Sucrose Concentration vs. Tubing Permeability Band Color Sucrose % Initial Volume (mL) Final Volume (mL) Net Displacement (mL) Yellow 30% 10mL 14mL 4mL Red 15% 10mL 12mL 2mL Blue 3% 10mL 9mL - 1ml Green 3% 10mL 6mL -4mL
The hypothesis is that the increase in concentration of sucrose results in increased amount of osmosis.
A hypothesis refers to a proposed explanation for a phenomenon. It is a testable statement regarding the relationship between two or more variables or a proposed explanation for some observed phenomenon. It is an assumption made based on some evidence as presented in the table. In the table it is seen that as sucrose concentration increases, the net displacement decreases. Hence, based on the evidence it can be hypothesized that “the increase in concentration of sucrose results in increased amount of osmosis”.
The reasoning is based on the initial volume (which is same for all) and final volume (which decreases with the increasing concentration of sucrose) and net displacement. Osmosis refers to the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules, through a partially permeable membrane. Net displacement refers to the number of molecules in the direction of the forces minus the number of molecules moving in other direction. Hence, as the net displacement decreases with concentration of sucrose it can be inferred that the increase in concentration of sucrose results in increased amount of osmosis.
Note: The question is incomplete. The complete question is attached.
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How many chloride ions are present in 65.5 mL of 0.210 m AlCl3 solution?
Chloride ions, IS 1.21 1022 8.28 1021 ions of chloride Chloride ions, 2.48 1022 4.02 1023 and 5.79 1024 chloride ions, respectively.
What kinds of ions contain chloride?Halogen picks one electron to become an anion (negatively charged ion), Cl, which creates the chloride ion. The hydrochloric acid HCl salts, commonly known as chlorides, are composed of chloride ions. Sea salt, which itself is sodium chloride and has the chemical formula NaCl, serves as an illustration.
The effects of chloride ions on the bodyNearly two thirds of all the anions in the extravascular space are chloride ions. They are required for the maintenance of the brain's osmolality, water content, and acid-base balance. The production of hydrogen chloride (HCl) in the stomachs also requires chloride.
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What are the numbers of neutrons of the first 20 elements
The discrepancy between the atomic masses and the masses number of the atomic (M) is equal to the amount of neutrons (Z).
What function does a neutron serve?In contrast to the hydrogen nucleus, which has a single proton, neutrons are necessary for the durability of nuclei. Nuclear fusion or fission generate a ton of neutrons. Through fusion, fusion, and spontaneous fission processes, they are a major contributor to the planetary formation of fundamental particles within stars.
Hydrogen = 0 neutrons
Helium = 2 neutron
lithium=4 neutron
beryllium=5 neutron
boron = 6 neutron
carbon = 6neutron
nitrogen=7n
oxygen= 8n
fluorine= 10n
neon= 10n
sodium= 12n
magnesium= 12n
aluminum = 14 n
silicon= 14n
phosphorus= 16n
sulphur= 16n
chlorine= 18 n
argon= 22 n
potassium= 20n
calcium= 20n
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Give the electron-domain and molecular geometries for the following molecules and ions. molecular geometry -Select- electron domain (a) NH CI ---Select- (b) C032 ---Select- (c) BF3 --Select-- (d) XeF4 ---Select-- (e) CIO3 ---Select- (f) XeF2 ---Select-
The following ions and compounds. electron domain, molecular geometry (a) NH CI, Select-(b) C032, Select-(c) BF3, and Select-(d) XeF4.
How are the electromagnetic domain and molecular formula determined?To reduce repulsion, distribute the electron domain around the center atom. The overall amount of electron regions is counted. To ascertain the molecular geometry, consider the angular configuration of both the chemical bonds holding the atoms together. Remember that a bond with several atoms (such as a double or triple bond) counts into one electron domain.
What are the purposes of the molecular geometry and electron domain geometry?Result for an image Please provide the molecular and electron-domain geometries for following compounds and ions. molecular architecture Electron domain, choose (a) —-Select-NH CI (b) BF3 —Select— (d) XeF4 —-Select— C032 —-Select- (e)
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if you are working with a chemical and need to find out about the routes of exposure, as well as the short and long term effects of exposure, where on the sds would you look?
If you need to learn more about the exposure pathways, as well as the immediate and long-term impacts of exposure, when dealing with a chemical, Toxicological Information Section 11
What are the consequences of toxicity?Additionally possible symptoms include mortality, cyanosis, a headache, weakness, dizziness, shortness of breath, and cyanosis. Ingestion can irritate the digestive system and trigger nausea and vomiting. According to reports, DAAB can cause methemoglobinemia after being inhaled, ingested, or absorbed via the skin.
Toxicology: What is it?A branch of research known as toxicology aids in our understanding of the potentially hazardous consequences that certain materials, settings, and events may have on humans, animals, and the environment.
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Identify the term matching each description related to dissolving compounds. The fluid, usually liquid, that dissolves another compound Choose... The mass of a compound that can dissolve per mass of liquid ____ choose a. Insoluble b. Solvent c.Unsaturated d. Solubility e. Saturated f. Solute
The liquid or gaseous fluid that dissolves another compound = b. Solvent, The mass of a compound that can dissolve per mass of liquid = d. Solubility
A solvent is a substance that is able to dissolve another substance (the solute) to form a solution. A solution is a uniform mixture of solute and solvent. Solubility is a measure of how much solute can be dissolved in a given amount of solvent at a specific temperature.A solvent is the substance in which a solute is dissolved to form a solution. Solubility, on the other hand, is a measure of how much solute can be dissolved in a given amount of solvent at a specific temperature. In other words, the solvent is the medium in which a solute is dissolved, while solubility is a property of the solute and describes its ability to dissolve in a specific solvent under specific conditions.
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which amount has the greatest mass? responses 1 mole of sodium 1 mole of sodium 1 mole of oxygen 1 mole of oxygen 1 mole of chlorine 1 mole of chlorine 1 mole of uranium
Simply compare the options' masses to determine which has the highest mass as each has only one mole. The most abundant element is uranium, which has roughly 238 amu.
A chemical compound's mass M is equal to its amount of material, expressed in moles, multiplied by its mass. Calculators for molar mass, molecular weight, and elemental makeup can be found online. One mole of sodium atoms contains around 23 grams or 1 Na atom, which has an estimated mass of 23 u. The approximate mass of one oxygen atom is 16 u, or around 16 g, for one mole of oxygen atoms. One mol of chlorine atoms has an approximate mass of 35.453 grams, or 35.453 u for one chlorine atom. Finally one uranium contains 238u. Compared with other molecules uranium has the greatest mass.
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The lattice energy of MgCl2 is the energy change for which one of the following processes?a. Mg(s) + Cl2(g) → MgCl2(s)b. Mg(g) + 2Cl(g) → MgCl2(s)c. Mg2+(s) + 2Cl−(g) → MgCl2(g)d. Mg2+(g) + 2Cl−(g) → MgCl2(s)e. MgCl2(aq) → MgCl2(s)
The lattice energy of MgCl2 is the energy change for Option D Mg2+(g) + 2Cl−(g) → MgCl2(s)e. MgCl2(aq) → MgCl2(s)
The energy necessary to turn one mole of ionic solid into gaseous ionic components is defined as lattice energy. Or, put that another way, it is the energy is released whenever an ionic solid is established from its gaseous ionic constituents. The lattice energy in chemistry is the energy change that occurs during the creation of one molarity of a crystalline ionic compound from its constituent ions, which also are assumed to be in the gaseous form at the start. It is a measurement of the cohesive forces that hold ionic solids together. The highest lattice energy is displayed by NaF. The greater the attraction between ions, the smaller the surface area of the cation. When ions of opposite charge are small, the bond between them is strongest. Hence lattice energy for MgCl2 is given by Mg2+(g) + 2Cl-(g) --> MgCl2(s). So option D is correct.
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explain the use of chemical and physical properties in the development of the periodic table activity
Elements in the each column possess similar chemical and physical properties.
Periodic table is organized in several different ways, most notably by increasing the atomic number. Because the elements are arranged by atomic number, and they are lined up in columns. Elements in each of the column will possess chemical and physical properties. The main three categories of elements are: metals, nonmetals as well as metalloids. Elements share some physical and chemical properties like: Ductility, Solids at room temperature, It has shiny luster, Conducts electricity and it form positively charged ions (cations) as they tend to lose negative electrons easily in the chemical reactions.
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Classify each of the following as either a Lewis acid or a Lewis base.?
1. B(OH)3
2. P(CH3)3
3. BeCl2
4. CN^-
Suppose I have enough ingredients to make 25 cookies, but when I go to bake them, | only get 18. What percent yield did I obtain?
You obtained a 72% yield. Suppose I have enough ingredients to make 25 cookies.
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Consider the pair of reactions. Draw the organic products, then predict the type of substitution mechanism and compare the expected rates.
The pair of reaction will be solvolysis. Both reaction will occur by SN1 mechanism.
Solvolysis is a chemical reaction in which the solvent, such as water or the alcohol, is one of the reagents and it is present in great excess of that required for the reaction.
For the two reactions, the organic product is the same. Both the reactions will occur by SN1 mechanism since the substrate is a tertiary alkyl halide and the nucleophile is CH3OH as well as the rate of reaction depends on the concentration of the alkyl halide and the independent of the concentration of methanol present.
Therefore, change the volume of the solvent has no effect on the rate of reaction. The two reactions will proceed exactly the same rate since the initial concentration of the alkyl halide is the same for both the reactions.
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A student draws a distance verses time graph to describe the motion of a model train. What does a
horizontal section of the graph indicate about the motion of the train?
A student draws a distance verses time graph to describe the motion of a model train therefore the horizontal section of the graph indicates that the train is moving with uniform velocity with no acceleration because there is no change in velocity.
What is Uniform Velocity?This occurs when the average velocity between any two points along its path is the same in magnitude as well as direction.
If the velocity-time graph for the part of a journey is a horizontal line, then it simply means that the train is moving with uniform velocity with no acceleration because there is no change in velocity thereby making it the correct choice.
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