3. 4 g of a nonelectrolyte dissolved in 78. 3 g of water produces a solution. The molar mass of the solute will be 17.94.
What is molar mass?
Molar mass of a substance is its mass in grams in per mole of a solution.
Freezing point: Freezing point of a substance is a temperature at which a liquid starts to solidify.
Depression in the freezing point can be calculated
[Depression in freezing point of pure solvent—Freezing point of solution] =[(0) - (-4.5)] °C =4.5 °C
molar mass = Number of moles of solute m / Mass of solvent in Kg
3.4g / M x 1/ 0.0783 kg = 43.42
Substitute AT by 4.5°C , Kr by 1.86 °C/m, and m by 43.42 m in equation (1) as follows:
1.86 x 43.42 / 4.5 = 17.94
Therefore, molar mass of solute to be 17.94.
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What would it mean if you added liquid bromine to your final transfer hydrogenation product and the resulting mixture converted from dark maroon to clear upon heating?
For breaking alkenes, liquid bromine was utilized. When liquid bromine is added to the finished product and it turns clear, it has reacted.
The principal test used to determine the organic compound's unsaturation in a qualitative examination of organic compounds is the bromine water test. It aids in determining the compound's functional group.
Unsaturated hydrocarbons and bromine water engage in an additional process. When the double bond breaks, bromine is added. The reaction's final result has no color.
However, there is no addition reaction when bromine water combines with saturated hydrocarbons. As a result, the solution's hue is unchanged and remains brown.
So, a qualitative test for saturated and unsaturated hydrocarbons is a reaction with liquid bromine.
The presence of unsaturated hydrocarbons, or functional groups with double bonds, can be seen in the mixture when it transforms into a clear
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Some of the most dangerous conditions occur when temperatures are hovering around _______ degrees fahrenheit, or freezing, when snow begins to turn to watery slush.
Answer:
32 ° F
Explanation:
Freezing temp for water is 32 degrees at 1 atm
A student sets up the following equation to convert a measurement.
(The ? stands for a number the student is going to calculate.)
Fill in the missing part of this equation.
Answer:
[tex]\frac{1 m}{100 cm}[/tex]
Explanation:
The final answer has a different set of units. In particular, meters (m) changes to centimeters (cm). To make this change, you need to multiply the first value by proportions.
When writing these proportions, it is important that they are arranged in a way that allows for the cancellation of units. For instance, since m is located in the denominator, it must be located in the numerator of the conversion.
Proportion:
1 m = 100 cm
The full expression:
[tex]-1.7*10^5\frac{V}{m}[/tex] · [tex]\frac{1 m}{100 cm}[/tex] = [tex]? \frac{V}{cm}[/tex] ^As you can see, the old unit (m) cancels out and you are left with cm in the denominator.
Consider the hydrocarbon below. a skeletal model has line segments that slant down, run flat in a double bond, slant up, and run flat. which of these is a trans- isomer of the above hydrocarbon?
The correct answer would be the structure attached of the form slant up, then run flat in a double bond, slant up and run flat.
Cis-Trans isomerism(GEOMETRIC ISOMERS)Cis-trans isomers are compounds that, as a result of the existence of a hard-structure in their molecule, have distinct configurations (elements that are constantly in distinct places in space).Cis-trans isomerism may be seen in alkenes and cyclic molecules.trans-isomers: the two hydrogen atoms are on opposite sides.cis-isomers: the two hydrogen atoms are on the same side, as are the two carbon groups.To view similar questions on cis-trans isomers, you can refer:
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Answer:
D
Explanation:
In a solution, when the concentrations of a weak acid and its conjugate base are equal, ________.
I don't know the answer
In a solution, when the concentrations of a weak acid and its conjugate base are equal, the -log of the concentration of H+ and the -log of the Ka are equal.
What is Henderson-Hasselbalch equation ?This formula is frequently used to determine the pH of buffer solutions. A weak acid and its conjugate base make up buffer solutions.To find the pH of the buffer solution, we obtain the pKa of the weak acid and add it to the log of the concentration of the conjugate base divided by the concentration of weak acid. So whenever the concentration of the weak acid is equal to the concentration of the conjugate base, the pH of the buffer solution is equal to the pKa of the weak acid.To know more about buffer solutions you can refer to the link below:
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What are different types of bacteria classified?
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They are classified on the basis of their physical features- Shape and Appearance.
The four basic shapes of bacteria are Coccus (spherical or ovoid), bacillus (rod-like), vibrio (comma-shaped ), and spirilla (spiral or helical shaped).
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For a particular redox reaction, bro− is oxidized to bro−3 and fe3 is reduced to fe2. complete and balance the equation for this reaction in basic solution. the phases are optional
The balanced chemical equation in a basic solution will be,
[tex]BrO^{-} + 4OH^{-} +4Fe^{+3}[/tex] → [tex]BrO_{3} ^{-} + 4H_{2} O+4Fe^{+2}[/tex]
The reaction in which oxidation and reduction reaction takes place simultaneously is called redox reaction or oxidation - reduction reaction .
Rules for the balanced chemical equation in a basic solution are :
First write half - reaction.Now balancing the main atoms in the reactionNow balancing the hydrogen and oxygen atoms on both sides of the reaction .If the oxygen atoms is not balance on both side then add water molecule at that side at that side where more number of oxygen atom is present.If the hydrogen atom are not balanced on both side then add hydroxide ion at that side of where less number of hydrogen are present.Now at last balance the charge.Therefore, the balanced chemical equation in a basic solution will be,
[tex]BrO^{-} + 4OH^{-} +4Fe^{+3}[/tex] → [tex]BrO_{3} ^{-} + 4H_{2} O+4Fe^{+2}[/tex]
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There are 30.974 grams of phosphorus in one mole. approximately how many atoms of phosphorus are there in one mole? (5.01) 6.02 × 1023 c. 6.02 × 10-23 5.145 × 10-23 d. 1.86 × 1025
There are approximately 6.02 × 10²³ atoms of phosphorus in one mole of 30.974 grams of phosphorus (option A).
How to calculate number of atoms?The number of atoms of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number. That is;
no of atoms = no of moles × 6.02 × 10²³
According to this question, there are 30.974 grams of phosphorus in one mole of phosphorus. The number of atoms can be calculated as follows:
no of moles of P = 30.974g ÷ 31g/mol = 0.99mol
number of atoms = 0.99 mol × 6.02 × 10²³
number of atoms = 6.02 × 10²³ atoms
Therefore, there are approximately 6.02 × 10²³ atoms of phosphorus in one mole of 30.974 grams of phosphorus.
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why is it not advisable to use sodium hydrogen instead of sodium hydrogen carbonate to relieve pain after being bitten by a bee
Answer:
iron deficiency
Explanation:
The average person will absorb no more than how many mg of calcium at one time?
a. 1500
b. 500
c. 200
d. 1000
The average person will absorb no more than 500 mg of calcium at one time.
So, option B is correct one.
For maximum absorption, no more than 500 mg of calcium should be taken in a single dose. The absorption of the minerals is actually lower by taking too high an amount of calcium at one time from a supplement. Calcium is absorb from the food. If you think you need more a calcium supplement , ask your doctor or dietitian to recommend one. Taking too high amount of calcium at one time, particularly from a supplement , can actually lower the absorption of the mineral.
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Moderate alcohol consumption is no more than ________ alcoholic drink(s) daily for adult women and up to ________ drink(s) daily for adult men
Moderate alcohol consumption is no more than [tex]One[/tex] alcoholic drink(s) daily for adult women and up to [tex]Two[/tex] drink(s) daily for adult men.
What is an alcohol?
Alcohol is an organic compound containing a hydroxyl group and a carbon atom; Alcohol can be an intoxicant found in alcoholic beverages.
An alcoholic drink (also called an alcoholic beverage, adult beverage, or simply a drink) is a drink that contains ethanol, a type of alcohol that acts as a drug and is produced by fermentation of grains, fruits, or other sources of sugar.
The consumption of alcoholic drinks, often referred to as "drinking", plays an important social role in many cultures. Most countries have laws regulating the production, sale, and consumption of alcoholic beverages.
So, according to the scientific studies, the alcoholic consumption for women in a day is not more then one and for men is not for two drink(s)
1 Drink includes:
For beer: 355 ML
For Wine: 148 ML
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What is the percent by volume of ethanol in gasohol when 95 ml of ethanol is added to sufficient gasoline to make 1.0 l of gasohol?
The percentage of volume of ethanol is 9.5%.
What is volume by volume percentage?Volume/volume percentage (v/v% or percent v/v) is a unit used to express how much of a material is present in a solution. It is defined as the volume of the solute divided by the sum of the volumes of the solution, multiplied by one hundred. Examples: The average alcohol concentration (v/v%) of wine is 12 percent.
The formula used to get the volume of ethanol in percentages is
Percent of volume of ethanol = (volume of solute / total volume) * 100
Percent volume of Ethanol = (volume of ethanol / total volume) * 100
= 95mL / 1000mL * 100
= 9.5%
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The interval shown here represents a _____.
1.) strong acid
2.) weak acid
3.) weak base
4.) strong base
The given pH scale range from [tex]0-3[/tex] indicates the strong acid.
The pH scale, which ranges from [tex]0 -14[/tex], was developed by Sorensen to quantitatively define the strength of an acid and a base.
A pH value indicates the amounts of hydrogen ions and, hydroxide ions present. The negative logarithm of the hydrogen ion concentration is referred to as pH and is represented by:
[tex]pH = -log [H^{+} ][/tex]
For acids, the pH value is always less than [tex]7[/tex].
For bases, the pH value is always more than [tex]7[/tex].
For neutral solution, pH value is equal to [tex]7[/tex].
Thus, for the provided pH scale range [tex]0-3[/tex], it represents strong acid which will give large concentration of protons on dissociation. since lower pH value indicates higher concentration of protons created by an acid.
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What quantity of nag3 was required to reach the equivalence point in the titration?.
1.0 mL x 0.1 mM quantity of nag3 was required to reach the equivalence point in the titration.
The technique of titration, also known as titrimetry, is used in chemical qualitative analysis to establish the concentration of a certain analyte in a mixture. Titration, commonly known as volumetric analysis, is an essential analytical chemistry technique. However, the two titration types that are most frequently used in quantitative chemical analysis are redox and acid-base titration, titration Procedures, bases and acids are diluted,oxygen-based titrations, and precipitation titrations. Utilize the titration equation. The equation is molarity (M) of the acid x volume (V) of the acid = molarity (M) of the base x volume (V) of the base if the titrant and analyte have a mole ratio of 1:1. (Molarity is the measure of a solution's concentration, which is given in moles of solute per liter of solution.)titrations utilizing intricate metrics.
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Which of the following can be mixed in solution with H₂CO3 to make a buffer?
OA. Na₂CO3
OB. HF
O C. NaHCO3
OD. NH3
SUBMIT
NaHCO3 is can be mixed in solution with H₂CO3 to make a buffer.
Sodium bicarbonate (IUPAC name: sodium bicarbonate, commonly known as baking soda or sodium bicarbonate) is a compound with the chemical formula NaHCO3. It is a salt composed of a sodium cation (Na+) and bicarbonate anion (HCO3-). Sodium bicarbonate is a crystalline white solid that often looks like a fine powder. It has a slightly salty, alkaline taste similar to soda carbonate (sodium carbonate). The natural mineral form is Narcolite. It is a component of sodium bicarbonate and is dissolved in many mineral springs.
Sodium bicarbonate is an antacid used to relieve heartburn and acid indigestion. Doctors may also prescribe sodium bicarbonate to reduce the acidity of blood and urine under certain conditions.
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What is the molarity of nickel ii chloride at 0.500 liters with 1 mole of nickel ii chloride solution?
Answer:
Molarity = 2 M
Explanation:
The molarity can be found using the molarity ratio:
Molarity = moles / volume (L)
You can plug the given moles and volume into the ratio and solve.
Molarity = moles / volume
Molarity = 1 mole / 0.500 L
Molarity = 2 M
Structures of compounds people use every day are shown. From which group of unsaturated hydrocarbons is each derived? 2 carbons are double bonded together, with H bonded to the left, and C H 2 bonded below left, above right, and below right. In a segment of an ongoing chain, 3 iterations of this structure are bonded together by single bonds from the bottom right C H 2 of one structure to the bottom left C H 2 of the next.
The group of unsaturated hydrocarbons which 2 carbons are double bonded together, with H bonded to the left, and C H 2 bonded below left, above right, and below right is derived from Alkenes
What are organic compounds?Organic compounds are compounds which contains carbon and hydrogen
Some few classes or organic compounds or hydrocarbons are as follows:
AlkanesAlkenesAlkynesAlkanolsAlkanoic acidKetonesEstersSo therefore, the group of unsaturated hydrocarbons which 2 carbons are double bonded together, with H bonded to the left, and C H 2 bonded below left, above right, and below right is derived from Alkenes
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Answer:
The answer is A.) Alkene
All the answers in that section are:
Alkene
Aromatic Hydrocarbon
Alkene
Alkyne
Explanation:
Here's the picture as proof. Hope it helps!
Would chromium-51 be useful for dating rocks containing chromium?
Draw the most stable form of the major product of each of the molecules with excess naoch2ch3 in ch3ch2oh , followed by aqueous acidic workup.
The most stable form of naoch2ch3 in ch3ch2oh.
What is aqueous acidic?When disbanded in an aqueous resolution, certain ions were removed from the explanation. An Arrhenius acid is a combination that increases the attention of H+ ions that are current when counted to water. These H+ ions include the hydronium ion (H3O+) when they incorporate with water molecules.The pH of an aqueous solution is the measurement of how acidic or basic it is. The pH of an aqueous solution can be defined and calculated by using the attention of the hydronium ion concentration in the solution.Some samples of aqueous resolutions etc.Some examples of explanations that are not aqueous solutions include any liquid that does not include water.
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Nitrous acid, hno2, has a ka of 7. 1 ✕ 10-4. what are [h3o ], [no2-], and [oh -] in 0. 40 m hno2?
Nitrous acid, hno2, has an acid dissociation constant - ka of 7. 1 ✕ 10-4. what are [h3o ], [no2-], and [oh -] in 0. 40 m hno2 - 4829 M [OH^-] = 1.439 x 10^-14 M
The acid dissociation constant (Ka) is used to differentiate between strong and weak acids. Strong acids have very high Ka values. The Ka value is determined by examining the equilibrium constant for acid dissociation. The acid dissociates more readily as the Ka increases.
The original molecular definition of an acid, according to Arrhenius, is a molecule that dissociates in an aqueous solution, releasing the hydrogen ion H+ (a proton): HA A + H+. acid dissociation constant is an equilibrium constant for this dissociation reaction.
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What locally acting chemicals are derived from arachidonic acid? multiple choice question. peptide hormones prostaglandins corticosteroids neurotransmitters
Prostaglandins locally acting chemicals are derived from arachidonic acid.
What does arachidonic acid produce?
Arachidonic acid is then quickly transformed into active metabolites, including prostaglandins, prostacyclin, and thromboxanes by cyclooxygenases and leukotrienes by lipoxygenases Page et al (2006). These metabolites' physiological effects are numerous and varied.Is prostaglandins a local hormone?
Prostaglandins are the most diversified group of eicosanoids and are believed to be produced in the majority of bodily tissues. This particular local hormone activates the inflammatory response and pain receptors.What is arachidonic acid found in?
Arachidonic acid can be found mainly in the fatty parts of meats and fish (largely red meat), so vegetarians usually have lower levels of arachidonic acid in the body than those with omnivorous diets. There is a great deal of controversy about arachidonic acid.Learn more about Prostaglandins
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What chemical compound do motor-neuron axon terminals release?
a. epinephrine
b. norepinephrine
c. sodium ions
d. acetylcholine
e. nicotinic acid
Option (d) acetylcholine is the right answer.
Acetylcholine is the chemical compound released by the motor-neuron axon terminals.
Acetylcholine:The parasympathetic nervous system, a portion of the autonomic nervous system (a branch of the peripheral nervous system), which contracts smooth muscles, widens blood vessels, increases body secretions, and decreases heart rate, uses acetylcholine as its primary neurotransmitter.The function of Acetylcholine: Acetylcholine is used at the neuromuscular junctions in the somatic nervous system to start motor neurons firing and control voluntary movements.Chemically speaking, acetylcholine is an organic chemical that is an ester of acetic acid and choline.
Process of acetylcholine:Choline acetyltransferase catalyzes the reaction in which acetyl coenzyme A (acetyl CoA, which is made from glucose) and choline are combined to form acetylcholine (CAT). Acetylcholine is one of the neuron's transmitters, and the existence of CAT in a neuron is clear evidence of this.To learn more about motor-neuron axon terminals visit:
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(4) When the hydrocarbon was burned 0.20 mol of water were produced.
How many moles of hydrogen atoms are there in 0.20 mol of water?
Moles of hydrogen atoms
Answer:
.4 moles of hydrogen
Explanation:
Formula for water == H2 O
so you can see there are twice as many hydrogen moles as water moles
.2 * 2 = .4
When the hydrocarbon was burned 0.20 mol of water were produced. 0.40 moles of hydrogen atoms are there in 0.20 mol of water.
A mole is a unit used to measure the concentration of a chemical in chemistry. It is described as the quantity of a substance that includes exactly the same number of atoms as there are in exactly 12 grammes of carbon-12. This number can be an entity (such as an atom, molecule, ion, or other particle). The dozen, which represents 12 items, and the pair, which represents 2 items, are two more basic units of measurement that are comparable to the mole.
2 moles H / 1 mole H2O = x moles H / 0.20 moles H2O
2 moles H ×0.20 moles H2O = 1 mole H × x moles H2O
0.40 moles H = x moles H2O
So, there are 0.40 moles of hydrogen atoms in 0.20 moles of water.
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With respect to bonding and electrical conductivity, respectively, sulfur hexafluoride, sf6(g), would be described as?
With respect to bonding and electrical conductivity, respectively, sulfur hexafluoride, sf6(g), would be described as "covalent and a nonconductor" because sulfur hexafluoride would be a covalent compound since neither fluorine nor sulfur are metallic elements and aqueous solutions containing covalent bonding do not conduct electricity.
What is electrical conductivity?The ability of an electrical charges or heat to move through a material is measured by its conductivity. A material is considered a conductor if it offers relatively minimal resistance to the transfer of thermal or electric energy.
The electricity is conducted by-
Particles that are electrically charged migrate, which results in electrical conductivity in metals. The existence of electron pairs, that are electrons in an atom's outer shell that really are free to move, is what distinguishes the atom of metal elements. Metals can carry an electric current thanks to these "free electrons."Valence electrons can migrate through into the lattice that makes the physical configuration of a metal because they are free to do so. Free electrons pass an electrical charges as they move through metal in an electric field, resembling billiard balls striking one another.To know more about the Electrical conductivity, here
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A metal object is to be gold-plated by an electrolytic procedure using aqueous AuCl3 electrolyte. How much gold may be deposited in 3.0 min by a constant current of 10. A
Answer:
This is the answer
Explanation:
charges passed = current x time = 10 x 3 x 60
= 1800 C
mole of charge = 1800 / 96500
= .01865 moles
Au+3 contains 3 positive charges
3 mole of charge will deposit 1 mole of Au .01865 moles will deposit .01865 / 3 mole
= 6.2167 x 10-3 moles.
When atoms of beryllium-9 are bombarded with alpha particles, neutrons are produced. What new isotope is also formed?
When atoms of beryllium-9 are bombarded with alpha particles, neutrons are produced, the new isotope will be C-6.
In research, the physicist James Chadwick attacked Beryllium using alpha particles produced by the nuclear reactions of polonium naturally. High radiation penetration through some kind of lead shield was seen, which the then-current particle theories were unable to account for.
There was indeed the production of a carbon-12 nucleus as well as the production of a neutron whenever one blasted beryllium with alpha particles.
The reaction of alpha decay can be written as:
[tex]Be^{9} _{4} + He^{4} _{2}[/tex] → [tex]C^{12} _{6} + n^{1} _{0}[/tex]
Therefore, when atoms of beryllium-9 are bombarded with alpha particles, neutrons are produced, the new isotope will be C-6.
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During an experiment, the percent yield of calcium chloride from a reaction was 82.38%. theoretically, the expected amount should have been 105 grams. what was the actual yield from this reaction? caco3 hcl → cacl2 co2 h2o 105.3 grams 101.1 grams 95.6 grams 86.5 grams
The actual theoretically yield from this reaction is 86.5 grams.
What is theoretically yield?
Theoretical yield is the quantity of a product obtained from the complete conversion of the limiting reactant in a chemical reaction. It is the amount of product resulting from a perfect (theoretical) chemical reaction, and thus not the same as the amount you'll actually get from a reaction in the lab.∵ The percentage yield = (actual yield/theoretical yield) * 100.
To calculate the theoretical yield from the balanced reaction:
CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O,
It is clear that 1 mole of CaCO₃ reacts with 2 mole of HCl to produce 1 mole of CaCl₂, 1 mole of CO₂, and 1 mole H₂O.
to calculate the no. of moles of 95.0 g CaCO₃
n = mass/molar mass = (95.0 g)/(100.0869 g/mole) = 0.95 mol.
Using cross multiplication:
1 mole of CaCO₃ produce → 1 mole of CaCl₂, from stichiometry.
∴ 0.95 mole of CaCO₃ produce → 0.95 mole of CaCl₂.
∴ The mass of CaCl₂ (theoretical yield) = (no. of moles) * (molar mass) ⇒(0.95 mole)*(110.98 g/mole) = 105.34 g.
∵ The percentage yield = (actual yield/theoretical yield)*100.
The percentage yield = 82.15%, theoretical yield = 105.34 g.
∴ The actual yield of CaCl₂ = (The percentage yield)(theoretical yield)/100
= (82.15%)(105.34 g)/100 = 86.53 g ≅ 86.5 g.
So, the actual theoretically yield from this reaction is 86.5 grams.
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The density of gold is 19.3 g/cm3. what is the volume in cubic centimeters of a piece of gold whose mass is 5.23 g?
If density of gold is 19.3g/cm3 amd mass is 5.23 g, then volume obtained is 0.27cm3.
Density is defined as how much a matter is packed in given area. It is represented by ρ.
ρ = m/ V
Given,
density of gold = 19.3 g/cm3
mass of gold = 5.23 g
As we know that,
density = mass/ volume
mass = density× volume
19.3 = 5.23 / volume
volume = 5.23/19.3
volume = 0.27 cm3.
Thus, if density and mass is given volume can be obtained.
Volume of gold is given as 0.27 cm3.
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What is the result of a chiari type ii malformation associated with a myelomeningocele?
Chiari type ii malformation associated with myelomeningocele can lead to severe morbidity and mortality if it is not identified and treated promptly.
People diagnosed with myelomeningocele have abnormalities of the brain and spine, including spinal cord defects and symptoms related to the area in which the spinal column and the brain meet, known as Chiari malformation. Chiari Type II or Arnold-Chiari malformation is a worse form in which the cerebellar vermis and some portion of the brain stem descend into the cervical chine.
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A 2.0 L container of nitrogen gas had a pressure of 3.2 atm. What volume would be necessary to decrease the pressure to 1.0 atm
Answer:
6.4 L
Explanation:
When all other variables are held constant, you can use Boyle's Law to find the missing volume:
P₁V₁ = P₂V₂
In this equation, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and volume. You can find the theoretical volume by plugging the given values into the equation and simplifying.
P₁ = 3.2 atm P₂ = 1.0 atm
V₁ = 2.0 L V₂ = ? L
P₁V₁ = P₂V₂ <----- Boyle's Law
(3.2 atm)(2.0 L) = (1.0 atm)V₂ <----- Insert values
6.4 = (1.0 atm)V₂ <----- Simplify left side
6.4 = V₂ <----- Divide both sides by 1.0
Answer:
6.4L or C on Brainly.
Explanation: