at an underwater depth of 250 ft, the pressure is 8.38 atm. what should the mole percent of oxygen be in the diving gas for the partial pressure of oxygen in the mixture to be 0.21 atm, the same as in air at 1 atm?
The mole percent of oxygen in the diving gas for the partial pressure of oxygen is 2.5%.
The partial pressure of a gas that's part of a gaseous mixture depends on the mole fraction of said gas and the total pressure of the mixture, as given by Dalton's Law of Partial Pressures.
Here we have to find the mole percent of oxygen,
So we have
[tex]P_{O2}[/tex] = [tex]X_{O2}[/tex] [tex]P_{tot}[/tex]
The mole percentage of O2 necessary to achieve a partial pressure of 0.21 atm, is
[tex]X_{O2}[/tex] = [tex]\frac{P_{)2} }{P_{tot} }[/tex] × 100% = [tex]\frac{0.21}{8.38}[/tex] × 100%
= 2.5%
Therefore the mole percentage of oxygen is 2.5%.
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_________ is defined as a method of preparing cocaine as a chemical substance so that it can be smoked. 1. coca paste 2. freebase 3. acetylation 4. protonation
The correct option is freebase. Cognitive therapy is most commonly employed in the treatment of anxiety disorders in conjunction with behavioral approaches, which may involve exposure exercises.
Cognitive therapy is often restricted to 20 sessions or less and is problem-focused on the concerns identified by the patient as being of primary concern. It causes a condition of extreme excitation. Powdered methamphetamine is injected, snorted, or smoked. Because they serve various functions, different cognitive-behavioral techniques are required. A cognitive-behavioral strategy to improving learning, for example, might have different criteria than a method for treating a depressed individual.
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How would the membrane shown in the transparency behave if its fatty acid tails consisted mostly of unsaturated fatty acid
The phospholipids in cell membranes, which are made up of unsaturated fatty acids, support membrane fluidity.
The fatty acid tails of phospholipids are made thicker and more difficult to assemble tightly together by unsaturated fatty acids. So, the phopholipids are spaced farther apart by the tails of unsaturated fatty acids. This makes membrane fluidity greater.
Less fluid membranes contain lipids with longer fatty acid tails than do membranes with shorter fatty acid tails. This is due to the fact that lipids with longer fatty acid tails have more surface area available for surface interaction.
Fats that are unsaturated are more likely to oxidise. The more brittle double bonds, which permit more oxygen to react at those locations, are to blame for this.
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an element with a mass of 780 grams decays by 18% per minute. to the nearest minute, how long will it be until there are 30 grams of the element remaining?
A 780 gram element decays at a rate of 18% every minute. 780 elements are still missing (1-0.171) 19 .
Element:
What does that mean?A basic object that is difficult to divide into smaller bits is described as an element. An element is a chemical that cannot be broken down by non-nuclear processes in physics or chemistry. A discrete component of a bigger structure or collection is referred to as an element in computers and mathematics.
Element and atom definitions?The most basic form of a material is an element. In general, it cannot be streamlined or broken down into smaller parts. A constituent of an element is an atoms. A specific element only has one kind of atom per atom. Charged particles, neutrons, and electrons, which are particles, make up the remainder of an atom.
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A solution is an example of a(n) _____.
homogeneous mixture
compound
heterogeneous mixture
element
The two liquids being measured when obtaining an absorbance spectrum are called the ______ and the _______ solutions.
Answer:
head
Explanation:
Edge 2022
1. Which are examples of heterogeneous mixtures? Select all that apply.
muddy water
salt water
pure gold
chocolate chip cookies
Answer:
1. Muddy water
2. Salt water
3. Chocolate chip cookies
Explanation:
I did this
A source of energy is needed to start the burning of the candle. What energy source is used? Did the reaction give off or absorb heat?
Which of the following statements correctly describe d orbitals?
a. The d orbitals of a group have different energies
b. d orbitals always occur in groups of 5.
c. d orbitals are only possible for n 3.
d. The d orbitals of a group all have the same shape.
Quantum numbers in the bonding of chemicals. ... called p orbitals; a d subshell (l = 2) is made up of five orbitals, or d orbitals, and has a length of two. The magnetic quantum number, ml, which can take the 2l + 1 values l, l 1,..., l, is used to identify each individual orbital.
When electrons jump between an atom's lowest p and d orbitals, they produce a series of spectral lines known as the diffuse series. Between 1 and 2, the total orbital angular momentum varies. The primary focus of CFT is the interaction of the five (n 1)d orbitals with ligands arranged around a transition-metal ion in a regular array. We will concentrate on using CFT to visualize octahedral complexes, which are by far the most prevalent and straightforward to visualize.
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how many grams of mgso 4 4 should be used if you desire to make 1.0 grams of mgcl 2 2 ? do not include units in your answer. make sure your answer has at least 3 significant digits
The mass (in grams) of MgSO₄ That should be used is 1.26 g
How to determine the mass of MgSO₄We'll begin by writing the balanced equation for the reaction. This is given below:
MgSO₄ + 2HCl —> MgCl₂ + H₂SO₄
Molar mass of MgSO₄ = 24 + 32 + (16 × 4) = 120 g/molMass of MgSO₄ from the balanced equation = 1 × 120 = 120 gMolar mass of MgCl₂ = 24 + (35.5 × 2) = 95 g/mol Mass of MgCl₂ from the balanced equation = 1 × 95 = 95 gFinally, we shall determine the mass of MgSO₄ needed for the reaction as follow:
From the balanced equation above,
95 g of MgCl₂ were produced from 120 g of MgSO₄
Therefore,
1 g of MgCl₂ will be produce from = (1 × 120) / 95 = 1.26 g of MgSO₄
Thus, the mass of MgSO₄ needed is 1.26 g
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A reversible reaction is _____.
a reaction that goes to completion
a reaction that can occur in both forward and reverse directions at the same time
not very important to the study of chemical equilibrium
a reaction that alternates between going to the right and going to the left
A reversible reaction is a reaction that can occur in both forward and reverse directions at the same time
Reversible reaction in which the reactant react to form product and simultaneously the product again form the reactant that's why a reaction that can occur in both forward and reverse directions at the same time and the reversible reaction exhibit the same reaction rate for forward and reverse reaction at equilibrium
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the major product of this reaction exists as two stereoisomers. draw both isomers. show all hydrogen atoms in the structures. use wedge and dash bonds to indicate the stereochemistry.
It is a method of representing the 3- D structure of a molecule in which simple lines represent bonds in the plane of the image, wedge-shaped lines represent bonds towards the viewer and dashed lines represent bonds away from the viewer.
What are stereoisomers?
Stereoisomers are isomeric molecules with same molecular formula but differ in the three-dimensional orientations of their atoms in spaceThus they posses similar physical and chemical properties.Stereoisomers are divided into geometric and optical isomersWhat is nucleophilic attack?
A nucleophilic attack occurs when an electron-rich species (the nucleophile) attack an electron-deficient species (the electrophile, a carbocation) forming a new bond between the nucleophile and the carbocation
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a certain mass of nitrogen gas occupies a volume of 9.33 l at a pressure of 8.06 atm. at what pressure will the volume of this sample be 11.71 l? assume constant temperature and ideal behavior.
The pressure at which the volume of this sample is 11.71 l is 6.42 atm.
The moles and temperature of the nitrogen gas remain constant and we anticipate that it has ideal conditions, so we can use Boyle's law to solve this problem. We are able to write the equation as follows:
P1V1=P2V2
Initial volume (given); V1=9.33L
Initial pressure (given); P1=8.06atm
The final volume (given); V2=11.71L
Final pressure (given); P2=?
Calculation:-
8.06atm × 9.33L = P2 × 11.71L
P2 = 8.06atm × 9.33L = 75.1998atm = 6.4218 atm ≅ 6.42 atm
11.71L 11.71
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what physical change would most likely occur to occupnats of an unpressurized aircraft flying over 15000 feet without
According to the given statement Along with tunnel vision, blue fingernails and lips start to appear.
What is the physical change?A substance undergoes a physical shift when its shape or appearance changes but the sort of matter it contains does not. On the other hand, a chemical transformation of matter results in the creation of at least one new material with novel properties. Differentiating between chemical and physical change can be challenging.
What importance does physical change have?In chemistry, the term "physical change" refers to changes to items that don't produce entirely new substances. A substance's molecular structure is maintained by physical change. For example, whether it is boiling or freezing, water is made up of two hydrogen atoms and one oxygen molecule.
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25 ml of a 0. 10 m solution of magnesium chloride reacts with 25 ml of potassium hydroxide to form a magnesium hydroxide precipitate. What is the minimum concentration of potassium hydroxide necessary to completely precipitate all of the magnesium?.
Magnesium chloride, often known as MgCl2, can be produced chemically by extracting it from brine or seawater.
Magnesium chloride+ potassium hydroxide (25 ml )------>magnesium hydroxide
Magnesium chloride: what is it?
One magnesium (Mg) and two chloride ions make up magnesium chloride, also known as magnesium dichloride, magnesium (II) chloride, or chloromagnesite (Cl-).
Ionic halides, such as magnesium dichloride and related salts, have the appearance of fine, white to grey granules.
It has no smell and is very water soluble.It is frequently employed as medication for numerous cellular processes.Uses of MgCl2 (Magnesium Chloride)
Magnesium metals are produced using magnesium chloride as a precursor.utilised for soil stabilisation, dust management, and wind erosion.Fire extinguishers use this.used as an additive in food.utilised in the production of paper.is a component of disinfectants.a flocculating agent is used.To learn more about Magnesium hydroxide reaction, visit
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what are the answers??
Answer:
c
Explanation:
How many moles are required to produce 250 mL of a 0.46 M solution?Given:Find:Equation Used:Answer:
Step 1 - Understanding the definition of molar concentration
Molar concentration (M or mol/L) is defined as the quotient between the number of moles (n) and the total volume of the solution (V):
[tex]M=\frac{n}{V}[/tex]Therefore, if the volume of the solution and its final concentration are known, we can use the equation to find the required number of moles.
Step 2 - Finding the required number of moles
The solution's concentration is 0.46 M and its volume is 250 ml. The volume must always be used in L, so:
[tex]\begin{gathered} M=\frac{n}{V}\to n=M\times V \\ n=0.46\times0.250=0.115\text{ moles} \end{gathered}[/tex]Therefore, 0.115 moles would be required.
if 17.9 mlml of 0.800 m hcl hcl solution are needed to neutralize 5.00 mlml of a household ammonia solution, what is the molar concentration of the ammonia?
Ammonia has a concentration of 2.864 M. Utilizing the formula provided by the neutralization reaction, n1M1V1=n2M2V2,
What is the purpose of ammonia?Ammonia generated from industries is utilized as agricultural fertilizer to the extent of 80%. In addition to such uses, ammonium is made into plastics, explosives, textile, insecticides, dyes, and other chemicals. It is also employed to cleanse water supplies.
What can you find ammonia in?It is an abundant source of nitrogen to plants and animals and can be found in the water, soil, and air. The natural decomposition of manure or dead animals and vegetation is the primary source of the majority of the ammonia with in environment. Fertilizer is used with 80% of all manufactured ammonia.
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identify the type of interactions involved in each of the following processes taking place during the dissolution of sodium chloride ( nacl ) in water.
The answers include the following below:
Solvent-Solvent interactionsInteractions involving dipole-dipole interaction, interactions between the water moleculesSolute-Solute interactionsInteractions between ions of sodium chloride, interactions involving ion-ion attractionsSolute-Solvent interactionsInteractions formed between the sodium ions and the oxygen atoms of water molecules, interactions formed between the chloride ions and the hydrogen atoms of water molecules.The dissolution of salt in water is as a result of the combination of the solute which is the salt and solvent which is the water. Interactions go on between water molecules which is referred to as the Solvent-Solvent interactions and so on.
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A mysterious element is found in its neutral state. It has an atomic number of 88. Which element is it?
radon
uranium
radium
francium
The mysterious element with atomic number 88 is Radium.
Radium is a naturally occurring radioactive element. It is chemically represented with the symbol Ra. The atomic number of this number is 88 and this is a radionuclide.
This element is formed by the decay of Uranium and Thorium. This element also exists in isotopes and its isotopes are Ra-226 and Ra-228. The Radium-226 isotope is formed as a result of the decay series of Uranium whereas Radium-228 and Radium-224 are formed as a result of the Thorium decay series.
Like elemental radium, all isotopes of Radium are radioactive. It decays and produces Radon gas, which is a highly stable Noble gas.
Thus, the mysterious element with atomic number 88 is Radium.
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how much PE would a 100 kg man have on a sled at the top of the hill?
The Potential energy of a 100 - kilogram man on a sled at the top of the hill would be 980H, where H is the height of the sled on the top of the hill.
What is mechanical energy?Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total potential energy stored energy in the system which is represented by total potential energy.
As given in the problem we have to find out how much PE would a 100 kg man have on a sled at the top of the hill.
The potential energy of the man = 100 × 9.8 × H
= 980H
Both mass and acceleration due to the gravity of the earth are constant and the only variable is the height of the inclined surface.
Thus, a ball rolling down an incline has its maximum potential energy at the top, therefore the correct answer is option D.
Thus, the Potential energy of a 100 - kilogram man on a sled at the top of the hill would be 980H, where H is the height of the sled on the top of the hill.
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A 3.31-g sample of lead nitrate, Pb(NO3)2, molar mass = 331 g/mol, is heated in an evacuated cylinder with a volume of 1.62 L. The salt decomposes when heated, according to the equation2Pb(NO3)2(s) 2PbO(s) + 4NO2(g) + O2(g)Assuming complete decomposition, what is the pressure in the cylinder after decomposition and cooling to a temperature of 300 K? Assume the PbO(s) takes up negligible volume.a)0.380 atmb)0.228 atmc)0.0342 atmd)1.38 atme)none of these
2Pb(NO3)2(s) => 2PbO(s) + 4NO2(g) + O2(g)
We have this reaction in a cylinder and also have 300 K. We are going to make some assumptions about these gases inside the cylinder: gases are ideal.
Then we will use this formula:
[tex]p\text{ x V = n x R x T}[/tex]p = pressure in the cylinder
V = volume
n = moles
R = gas constant
T = temperature
Procedure:
1) We must calculate first how many moles we have after the decomposition of Pb(NO3)2, I mean how many moles of NO2(g) and O2(g) we have.
Note: PbO (s) takes up negligible volume (read the text please)
Let's calculate how many moles of Pb(NO3)2 is heated:
Moles Pb(NO3)2 = mass / molecular weight = 3.31 g / 331 g/mol = 0.01 moles
Using the reaction and stoichiometry we will calculate moles for NO2 and O2:
For NO2) 2Pb(NO3)2(s) => 2PbO(s) + 4NO2(g) + O2(g)
2 moles Pb(NO3)2 --------- 4 moles NO2
0.01 moles Pb(NO3)2---------- x = 0.02 moles NO2
For O2) 2Pb(NO3)2(s) => 2PbO(s) + 4NO2(g) + O2(g)
2 moles Pb(NO3)2----------- 1 mol O2
0.01 Pb(NO3)2 ------------ y = 0.005 moles O2
------------------------------------------------------------------------------------------------------
2) Inside the cylinder we have:
Total moles = moles NO2 + moles O2 = 0.02 + 0.005 = 0.025 moles
--------------------------------------------------------------------------------------------------------
3) Using Ideal gas law and clearing the pressure:
V = 1.62 L
n = 0.025 moles
T = 300 K
R = 0.0820 atm x L / mol x K
[tex]\begin{gathered} p\text{ = }\frac{0.025\text{ moles x 0.082 }\frac{atm\text{ x L}}{\text{mol x K}}\text{ x 300 K}}{1.62\text{ L}}= \\ =0.3796\text{ atm = 0.380 atm (3 significant digits)} \end{gathered}[/tex]Answer: a) 0.380 atm
PLEASE CHECK MY ANSWER my answer is D
The answer to this question is actually B.
The question is asking to select the procedure that can show how matter is conserved in physical changes. Removing the core from an apple may be a physical change, but matter is not conserved since something is being lost, the core. Inversely, by melting a piece of ice, no matter is lost and the mass will stay the same before and after the change.
A is incorrect because some matter is also lost there, and C is not a physical change.
Answer: B
Explanation:
the ss hindenburg contained about 5.33 × 105 g of h2 gas when it burned at lakehurst, new jersey, in 1937. the chemical reaction is as follows: 2h2 o2 → 2h2o how many grams of h2o were produced?
Answer: 4.75 X 10^6 g of H2O were produced in the SS Hindenburg when it burned at Lakehurst, New Jersey in 1937
Explanation:
The SS Hindenburg was burned at Lakehurst, New Jersey in 1937. It contained 5.33 x 105g of H2 gas.
The chemical reaction that took place was:
2H2 O2 -> 2H2O
5.33 X 105g= 559.65g
Therefore, 4.75 x 10^6g of H20 was produced in the process.
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in one of your reaction cuvettes you've added 1.0 ml of dtnb, 20 ul of 30 um acsch, 20 ul of 5 um tacrine, and 20 ul of ace. what are the final concentrations of acsch and tacrine in that reaction? be sure to show units and your calculations.
Final concentrations of acsch and tacrine in that reaction is 600x10⁻¹²mm.
What is the purpose of tacrine?The symptoms for mild to moderate Hypertension are managed by tacrine. Alzheimer's disease cannot be cured or prevented from worsening with tacrine. However, some Alzheimer's sufferers may benefit from tacrine since it helps them think more clearly.
How would you define the reaction?The behavior, procedure, or event of responding. B: opposition or resistance to a power, influence, or movement, particularly: a propensity for an old-fashioned and typically obsolete social or political order or policy.
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A jeweler suspects that a gold ring in his jewelry collection is fake. He knows that the density of real gold is 19.3 g/cm3. The ring has a mass of 109 grams. When he places the ring in a graduated cylinder filled with water, the water level rises from 20 mL to 26 mL. Is the gold ring fake?
Yes, it is fake! The actual density of the ring is higher than that of real gold.
No, the gold ring is real!
Yes, it is fake! The actual density of the ring is lower than that of real gold.
Yes, it is fake! The actual density of the ring is lower than that of real gold
How to determine if the gold ring is fake or notTo know if the gold ring is fake or not, we shall determine the density of the gold ring. This is shown below:
Density of real gold = 19.3 g/cm³ = 19.3 g/mLMass of gold ring = 109 gVolume of water = 10 mL Volume of water + gold ring = 26 mL Volume of gold ring = 26 – 20 = 6 mL Density of gold ring = ?Density = mass / volume
Density of gold ring = 109 / 6
Density of gold ring = 18.17 g/mL
Comparing the density of the gold ring (i.e 18.17 g/mL) to the density of real gold (i.e 19.3 g/cm³), we can conclude that the gold ring is fake.!
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g how accurately can the position of a 3.00- kev electron be measured assuming its energy is known to 3.00 % ?
The electron has a kinetic energy of 3 KeV. The accuracy rate for locating the electron is one percent.
What is in a electron?A negative charges particle known as an electron can either be free or attached to an atom (not bound). One of the three main types of particles within an atom is an electron that is bonded to it; other two are protons and neutrons.
How are electrons created?An electrical force maintains electrons in their shells. An atom's protons and electrons are drawn to each other. They both are electrically charged. Electrons have a negative charge (-), while protons have a positive charge (+).
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How to fix low ammonia levels in a salt water fish tank? Subject marine science
To fix low ammonia levels in water to Treat with Ammonia Remover
Complete a 25% water change and retest after a few hours
Treat with Ammonia Remover
When at a safe level of 0.0 mg treat the tank with Fast Filter Start to boost the bacteria in your filter that process ammonia
Continue to regularly test your water
Why does this occur, and how can I stop it?
Ammonia is a substance that develops naturally in your aquarium as waste, such as food, farces, or plant matter, breaks down. Your biological filter bacteria should break down ammonia using a process known as the Nitrogen Cycle.
High ammonia levels result from
inadequate biological filtration (New Tank Syndrome, damaged or immature)
excess stockexcessive eatingelevated temperaturesManage each of these elements to lower ammonia levels. Make sure to clean filter components, like sponges, in aquarium water because tap water will harm the microorganisms that remove ammonia.
Treatment of fix low ammonia level in salt water fish tank:
Fish excrete the poisonous waste product Ammonia, which is normally broken down into less dangerous molecules by bacteria in biological filters. You can assist if this biological process fails by chemically eliminating the ammonia.
Hence, to fix low ammonia levels in water to Treat with Ammonia Remover
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Please hurry I will make brainliest + 32 points each answer.
refers to a fulcrum. This part is a fixed point. The other part of a lever is a stiff bar that moves around the fulcrum. In this picture of a bicycle brake, label the two parts of the lever. Label the part that moves as A and the fulcrum as B.
The tire which is the moving part is labeled as A while the fulcrum is the silver nut that is close to the tire
What is the lever?The lever is one of the kinds of simple machines. Recall that a simple machine is a device that makes it easier for us to do work. There are three classes of lever and these are;
1) First order lever
2) Second order lever
3) Third order lever
In each of these cases, the levers must contain the load, the fulcrum and the effort. The fulcrum is also called the pivot as it plays the role of providing support for the system of the lever.
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Answer:
pluto
Explanation:
Examine Table 10.3 and list the compounds you think have hydrogen bonds. Explain why.
Answer
Ethanol and Ethylene Glycol
Procedure
Hydrogen bonding occurs when hydrogen forms a molecular bond with a highly electronegative element such as Oxygen, Nitrogen, and Fluorine. Based on the structure of the molecules we can see that ethane does not contain the previously mentioned elements, therefore it will not form hydrogen bonds. Dimethyl ether has an oxygen atom located in the middle of the molecule, making it difficult to form a bond with other dimethyl ether molecules.
Lastly, Ethanol and Ethylene Glycol possess OH groups which are free to interact with similar groups via hydrogen bonding. Additionally, these last compounds exhibit higher boiling points, which can indicate a stronger intermolecular bonding, which is a characteristic of hydrogen bonding.
