The difference with tonic water and club soda is that tonic water also has minute quantities of quinine. Quinine, a natural substance in cinchona tree bark, is responsible for the tonic's strong bitterness.
What uses are there just for tonic water?Drinking tonic water only has one biggest advantage, which is hydration. This should keep you nourished and improve your ability to concentrate more often than soda or juice because it's still water. It is kind of a this double sword because it has a sugar that is equivalent to those.
What draws Indians tonic water?The beverages had their start here within 1825 when British Army troops stationed in India started experimenting quinine with sugar, water, and gin to make an inadvertently tasty sundowner that also acted as a malaria preventative.
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what product is formed when the following acetal is hydrolyzed with aqueous acid? hint, do the mechanism at home and draw it ou
The product formed when the acetal is hydrolyzed with aqueous acid is [tex]R-CH(OH)-O-CH(OH)-R[/tex]
What is acetal hydrolization with acqueous acid?The product formed when the acetal is hydrolyzed with aqueous acid is two molecules of alchohol namely [tex]R-CH2-OH and R-CH2-OH.[/tex] This occurs as aqueous acid catalyzes the hydrolysis of the acetal bond, which breaks the bond between the two alcohol groups and releases them as individual molecules.
The hydrolysis of the acetal bond involves the acid protonating the oxygen atom, resulting in the formation of a positively charged oxonium ion. The positively charged oxonium ion then attracts a lone pair of electrons from an adjacent oxygen atom, resulting in the formation of a new bond between the two alcohol groups and the release of the two alcohol molecules.
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A certain amount of glucose, C6H12O6 burned in oxygen, and produced 22 grams of carbon dioxide, CO2. How many grams of water was produced at the same time?
C6H12O6 (s) + 6O2(g) → 6CO2 (g) + 6H2O (g)
A.22 grams of H2O
B.11 grams of H2O
C.9 grams of H2O
D.4.5 grams of H2O
Approximately
60
g of
C
6
H
12
O
6
.
Explanation:
We have the balanced equation (without state symbols):
6
H
2
O
+
6
C
O
2
→
C
6
H
12
O
6
+
6
O
2
So, we would need six moles of carbon dioxide to fully produce one mole of glucose.
Here, we got
88
g
of carbon dioxide, and we need to convert it into moles.
Carbon dioxide has a molar mass of
44
g/mol
. So here, there exist
88
g
44
g
/mol
=
2
mol
Since there are two moles of
C
O
2
, we can produce
2
6
⋅
1
=
1
3
moles of glucose
(
C
6
H
12
O
6
)
.
We need to find the mass of the glucose produced, so we multiply the number of moles of glucose by its molar mass.
Glucose has a molar mass of
180.156
g/mol
. So here, the mass of glucose produced is
1
3
mol
⋅
180.156
g
mol
≈
60
g
to the nearest whole number.
So, approximately
60
grams of glucose will be produced
a certain substance condenses at a temperature of . but if a sample of is prepared with of urea dissolved in it, the sample is found to have a condensation point of instead. calculate the molal boiling point elevation constant of . round your answer to significant digits.
Once you have calculated Boiling point Kb, you can round your answer to the appropriate number of significant digits based on the number of significant figures in the given values of x, T1, and T2.
The change in boiling point of a solution with a solute dissolved in it can be calculated using the equation for boiling point elevation:
ΔTb = Kb * molality
where ΔTb is the change in boiling point, Kb is the molal boiling point elevation constant, and molality is the concentration of the solute expressed in mol/kg.
Given that the substance condenses at T1, and that the sample with urea dissolved in it has a condensation point of T2, we can use these two temperatures to find ΔTb:
ΔTb = T2 - T1
We can then rearrange the equation for boiling point elevation to find Kb:
Kb = ΔTb / molality
We need to know the molality of the urea solution to find Kb. The molality can be calculated from the mass of the solute and the mass of the solvent:
molality = moles of solute / mass of solvent (in kg)
Since we are given that the sample contains x g of urea dissolved in it, we can calculate the moles of urea as:
moles of solute = x g / molar mass of urea
And the mass of the solvent can be calculated as:
mass of solvent = (mass of sample - x g) / 1000 g/kg
Putting everything together, we get:
Kb = ΔTb / (x g / molar mass of urea) / ((mass of sample - x g) / 1000 g/kg)
Note: The units of Kb are usually K/molal or °C/molal, so make sure to use consistent units when working through the calculation.
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which is closest in size to one mole of gas at STP?A) A carB) An elephantC) A microwaveD) A marble
The closest size comparison for a mole of any gas to a marble is now at Standards Temperature and Pressure (STP). It is proper to choose D).
Describe a mole :The mole is a normal kind of skin growth (nevi). They are generally caused by blocks of powder cells and appear as small, dark brown spots (melanocytes). Most men with between ten to forty moles, which typically arise throughout adolescence and might change or vanish over time.
What do you call one mole?6.022 1023 units of a material make up one mole of that substance. The number 6.022 1023 is referred to as "Avogadro's constant" or "Avogadro's constant." To translate between mass and the quantity of particles, utilize the mole concept.
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what is the trend in atomic size as you proceed down a group?
Atomic radius generally increases throughout a group and decreases over a period. Effective nuclear charge rises with time while ion current remains consistent.
How big an atomic is that?The maximum distance from that of a nucleus of an atom to its electronic structure orbital is typically defined as the atomic radius. As a result, the size of the largest filled orbital dictates the size of both the atom or ion even though particles are what occupy space amongst atoms.
The atomic radius is where?The radius in between nuclei of two atoms that are linked together is divided by two to produce the nuclear charge. Ionic radius typically decreases during a period from left to right. Within just a group, atoms' atomic radii typically grow from top to bottom.
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is it true that higher energy orbitals always extend further away from the nucleus than lower lying orbitals?
Yes , it is true that the higher energy orbitals always extend further away from the nucleus than the lower lying orbitals.
The lower energy orbitals are closer to the nucleus as compared to the higher energy orbital . The Aufbau principles tell us that the electrons first fill to the low energy orbitals that is closer to the nucleus and then fill the higher energy ones. the electrons filling between orbitals of equal energy, the electrons will fill the orbitals singly as far as the possible by the Hund's rule.
Thus , the lower energy orbitals are close to the nucleus than the higher energy orbitals.
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a closed system allows for the exchange of ___ with the surroundings.
Energy, on the other hand, a closed system can only interchange energy, not matter, with its surroundings.
What can a closed system communicate with outside sources?Through the flow of heat and work, a closed system can exchange energy with its surroundings. In other words, energy can cross the system boundary in the forms of work and heat. According to kinetic theory, heat is the energy resulting from atoms and molecules moving randomly.
Can matter in a closed system be exchanged with its surroundings?In thermodynamics, a closed system can exchange energy with its surroundings (as heat or work), but not matter. A system that is open to the environment can interchange energy and matter, but a system that is insulated from it cannot.
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a can of cola contains about 39 grams of sucrose, c12h22o11. how many moles of sucrose does this represent?
Sucrose is included in the package at an amount of 0.113 moles.
Describe sucrose.Sucrose is a naturally sweet simple carbohydrate. Fruits and plants contain it. The formula for it is C 12H 22O 11. The simple sugar is what is consumed.
Is sucrose a good sugar to use?Brief Summary According to an University of Southern california, Francisco study, sucrose, the more "natural type of sugar," may be just as harmful to your health as high fructose corn syrup.
39 g make up the sucrose's bulk.
The mole ratio of sucrose is 342.3 g/mol.
In order to determine the sugar moles, we
Sucrose moles equal 39g /342.3 = 0.113
The molecules of sucrose are therefore 0.113 mol.
Sucrose is included in the package at an amount of 0.113 moles.
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which enzyme of the citrate cycle catalyzes the oxidative decarboxylation reaction that produces co2, nadh, and succinyl-coa?
A malate dehydrogenase enzyme transforms malate back into oxaloacetate as the cycle's last step. A coenzyme is created, as is the case with all dehydrogenase-related processes.
What enzyme is responsible for the citric acid cycle process that results in NADH and CO2?
Explanation: Isocitrate dehydrogenase is an enzyme that catalyses the citric acid cycle's rate-limiting step. Isocitrate is converted to alpha-ketoglutarate, NADH, a proton, and a carbon dioxide molecule by the enzyme isocitrate dehydrogenase.
Which enzymes are responsible for the oxidative decarboxylation processes in the citric acid cycle?
Isocitrate can perform step 3, the first oxidative decarboxylation process in the citric acid cycle, because of the position of the hydrolysis on it. Another two-step procedure, step three is catalysed by an enzyme.
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if 4.8 g of an unknown sample is measured, how much of that unknown sample is possible to recover? show your work.
It is possible to recover 4.8 g of the unknown sample if 4.8 g of an unknown sample is measured.
Writing and balancing a chemical equation is required when a substance undergoes a chemical (or physical) change. The conservation of mass principle states that no matter may be created or destroyed by a chemical reaction. The carbon atom in sample of coal, for instance, changes into carbon dioxide as it burns. The mass of a carbon atom remains constant even as it transforms from a solid to a gas. Even when atoms interact to create new products during a chemical reaction, mass is maintained. This is true since the new substances were created using the atoms from the reactants.
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How many moles does 155.3 L of chlorine gas have at STP?
Answer:
5.88 moles
Explanation:
At Standard Temperature and Pressure (STP), the conditions are defined as a temperature of 0°C (273.15 K) and a pressure of 1 atm. To calculate the number of moles of chlorine gas in 155.3 liters at STP, we can use the Ideal Gas Law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
Substituting the known values:
P = 1 atm
V = 155.3 liters
R = 0.0821 L·atm/mol·K
T = 273.15 K
Solving for n:
n = (PV) / (RT) = (1 atm * 155.3 liters) / (0.0821 L·atm/mol·K * 273.15 K) = 5.88 moles
In conclusion, 155.3 liters of chlorine gas at STP would contain 5.88 moles of chlorine gas.
the lattice energy of kf is -821 kj/mol. when 1.427 g of kf is dissolved in water, 0.435 kj of heat is released. calculate the enthalpy of hydration of kf.
The enthalpy of hydration of KF will be 17.64 kJ/mol.
The enthalpy of hydration of a salt is the amount of heat released or absorbed when one mole of the salt dissolves in water to form hydrated ions. The enthalpy of hydration can be calculated as follows:
ΔH hydration = Q / n
where ΔH hydration is the enthalpy of hydration, Q is the heat released or absorbed, and n is the number of moles of salt.
In this case, the heat released is 0.435 kJ and the mass of KF is 1.427 g, so we can first calculate the number of moles of KF:
n = m / M
n = 1.427 g / (58.1 g/mol)
n = 0.0247 mol
Now we can calculate the enthalpy of hydration:
ΔH hydration = Q / n
ΔH hydration = 0.435 kJ / 0.0247 mol
ΔH hydration = 17.64 kJ/mol
So the enthalpy of hydration of KF is 17.64 kJ/mol.
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if a reaction vessel initially contains an concentration of 0.0500 m at 500 k, what are the equilibrium concentrations of and at 500 k?
If the reaction vessel initially contains the N₂O₄ concentration of 0.0550 m at 500 k , the equilibrium concentrations at 500 K of the N₂O₄ is 0.0115 M and NO₂ is 0.0769 M.
The equation is as :
N₂O₄ ⇄ 2NO₂
initial 0.0500 0
-2x + 2x
Eq. 0.0500 - x 2x
Kc = [NO₂]² / [ N₂O₄ ]
0.513 = (2x)² / 0.0500 - x
0.513 = 4x² / 0.0500 - x
x = 0.038
Therefore, the concentration of [ N₂O₄ ] = ( 0.0500 - 0.038 ) = 0.0115 M
The equilibrium concentration of [NO₂] = 2 (0.038) = 0.0769 M
This question is incomplete , the complete question is :
If a reaction vessel initially contains an N₂O₄ concentration of 0.0550 m at 500 k , what are the equilibrium concentrations of N₂O₄ and NO₂ at 500 k ?
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which set correctly describes the hybridization of each atom marked with an arrow? 341 group of answer choices a b c d
The correct option is: 1 = sp2, 2 = sp3, 3 = sp3, 4 = sp2.correctly describes the hybridization of each atom marked with an arrow
In organic chemistry, hybridization refers to the mixing of atomic orbitals to form a new set of hybrid orbitals. The most common types of hybridization in organic molecules are sp3, sp2, and sp.
Carbon atoms with sp3 hybridization have four orbitals that are hybridized, resulting in tetrahedral geometry around the carbon atom. Carbon atoms with sp2 hybridization have three orbitals that are hybridized, resulting in planar geometry with a 120° bond angle. Carbon atoms with sp hybridization have two orbitals that are hybridized, resulting in linear geometry with a 180° bond angle.
In this question, the first carbon atom is bonded to two other atoms and one double bond, which suggests sp2 hybridization. The second and third carbon atoms are bonded to three other atoms, which suggests sp3 hybridization. The fourth carbon atom is bonded to three other atoms and one double bond, which suggests sp2 hybridization.
which set correctly describes the hybridization of each atom marked with an arrow?
A. 1 = sp3, 2 = sp3, 3 = sp3, 4 = sp3
B. 1 = sp2, 2 = sp3, 3 = sp3, 4 = sp2
C. 1 = sp3, 2 = sp2, 3 = sp2, 4 = sp2
D. 1 = sp2, 2 = sp2, 3 = sp2, 4 = sp3
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a sample of sandstone consists of only silica (sio2) and calcite (caco3). when sandstone is heated, calcium carbonate decomposes to calcium oxide and carbon dioxide. silica does not decompose. a 19.5 mg sample of the sandstone rock yields 3.95 mg of carbon dioxide. what is the percentage of silica in the sandstone rock?
To calculate the percentage of silica in the sandstone rock, we need to first calculate the mass of silica in the sample. We can use the Law of Conservation of Mass to do this. The equation for this law is mass of reactants = mass of products.
In this case, the reactants are 19.5 mg of the sandstone rock and 3.95 mg of carbon dioxide. So the mass of silica in the sample is 19.5 - 3.95 = 15.55 mg.
To calculate the percentage of silica in the rock, we need to divide the mass of silica (15.55 mg) by the total mass of the sample (19.5 mg) and then multiply that by 100. So the percentage of silica in the rock is 15.55/19.5 * 100 = 79.87%.
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active transport usually moves molecules a. in the same direction as diffusion moves them. b. in a direction opposite to the one in which diffusion moves them. c. in a direction that tends to bring about equilibrium. d. from a solution with a lower ph toward one with a higher ph. e. from inside the cell to outside the cell.
Active transport usually moves molecules b. in a direction opposite to the one in which diffusion moves them. Therefore, the option b is the correct answer.
What is Diffusion?The movement of particles in a substance from a high concentration to a low concentration is called diffusion. Diffusion allows the movement of chemicals into and out of cells.
Two Types of Transport in the Cell MembraneThere are two types of molecule movements in a cell membrane: (1) active transport and (2) passive transport.
Active TransportActive transport is the movement of molecules across a membrane against a concentration gradient. Therefore, active transport usually moves molecules in a direction opposite to the one in which diffusion moves them. It move from an area of lower concentration to a higher concentration area. It frequently uses enzymes and is energy-intensive.
Passive TransportPassive transport is the movement of molecules from an area of higher concentration to a region of lower concentration, energy is not needed for the transport of the molecules. Passive transport is used to transfer all easily soluble particles. This process is used to keep a cell's equilibrium level and state of balance.
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Rank the solvents according to their polarities, from the most polar to non-polar. ethyl acetate, water, acetone, hexane, ethanol.
From most polar to least polar, water comes before ethanol, acetone, ethyl acetate, and then hexane.
What is solvent?In order to create a homogenous mixture, additional substances must dissolve in a solvent. For the purpose of facilitating different chemical reactions and separations, solvents are used to dissolve solutes, which can be either a solid, liquid, or gas.
The distribution of electronegativity among a solvent's atoms determines how polar the solvent is. High polarity will be present in solvents with polar functional groups and high electronegativity. Due to the high electronegativity of oxygen and the presence of hydrogen bonding, water is the most polar of the mentioned solvents. Due to the hydroxyl (-OH) functional group, ethanol is also polar. Due to the carbonyl (C=O) functional group in acetone, which forms a polar bond, acetone is more polar than ethyl acetate and hexane. Due to its ester functional group, ethyl acetate is a slightly polar solvent, however it is still less polar than acetone.
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what is the poh of 2.95 m ba(oh)2 solution? is the solution neutral, acidic, or basic? the poh of the solution is: the solution is: g
The pOH of Ba(OH)₂ solution is -0.77 and the solution is highly basic.
pOH of a solution is defined as the hydroxide ion(OH⁻) concentration of that particular solution. It is the measure of alkalinity of a solution. pOH is the negative logarithm of OH⁻ ion concentration.
pOH = -log [OH⁻]
Ba(OH)₂ dissociates as-
Ba(OH)₂ → Ba²⁺ + 2OH⁻
concentration of [OH⁻] = 2.95 M
2[OH⁻] = 2.95 M × 2 = 5.90 M
pOH= -log[OH⁻]
pOH = -log [5.90]
pOH= - 0.77
we know that
pH + pOH = 14
pH = 14- pOH
pH = 14-(-0.77)
pH = 14+ 0.77
pH =14.77
This means that Ba(OH)₂ solution is highly basic.
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why are the 3p and 3s quantum states in an isolated silicon atom transformed into the valence and conduction bands in a silicon crystal ?
The isolated silicon atom's 3p and 3s quantum states were converted into the valence and conduction bands in a silicon crystal. Because each atom [Si, Ge] has four neighbors.
The atom is the smallest unit of matter that can be divided without releasing electrically charged particles. It is also the smallest unit of matter with the chemical element's properties. As such, the atom is the fundamental unit of chemistry. Examine various electron configurations in electron shells surrounding the nucleus of an atom. Examine various electron configurations in electron shells surrounding the nucleus of an atom.
The rest is made up of a positively charged nucleus of protons and neutrons surrounded by an electron cloud. In comparison to electrons, which are the lightest charged particles in nature, the nucleus is small and dense. Electrons are attracted to any positive charge due to their electric charge.
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mmonia chemically reacts with oxygen gas to produce nitric oxide and water . what mass of water is produced by the reaction of of oxygen gas? round your answer to significant digits.
The chemical equation represents the reaction describes is;4NH3 + 5O2 = 4NO + 6H2O, 4 moles of NH3 = 4 (14 + 3*1) = 68g, Therefore, 68g of NH3 reacts with 160g of O2.But, we have only 4.5 g of oxygen.68g reacts with 160g,Xg reacts with 4.5, X = 68*4.5 / 160 = 1.9125g.
What type of reaction is an example of ammonia and oxygen?Ammonia's hydrogen is replaced by oxygen.This is a replacement reaction as a result.With the presence of oxygen, ammonia's nitrogen is being oxidized.This is another illustration of a redox process.
How can the mass generated in a reaction be found?For the chemical reaction, the chemical equation must be balanced. Create moles using the information provided.To calculate how much product is produced from each particular reactant, use stoichiometry.The limiting reagent is the one that yields the least amount of the final product.
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you titrate a 200 ml hbr solution with 0.5 m koh. if it takes 150 ml of koh to reach the equivalence point, what was the concentration of the original acid solution?
a.0,72M
b.0,38M
c.0,46M
d.0,67M
The original acid method's concentration would be 0.38M based on the assertion made.
Is HBr a strong or weak base?A proton (H) as well as a bromine atom can be found in HBr. It emits protons, which are just hydrogen ions, when forced to dissolve inside of an aqueous solution. The dissociation of hydrogen bromide is practically entirely complete. As a result, it is a powerful acid because, upon total dissociation, it releases hydrogen ions.
HBr + KOH -> KBr + H2O
moles of KOH = volume of KOH * concentration of KOH = 0.150 L * 0.5 mol/L = 0.075 mol
moles of HBr = moles of KOH = 0.075 mol
concentration of HBr = moles of HBr / volume of HBr = 0.075 mol / 0.200 L = 0.375 M = 0.38 M
So, the answer is 0.38 M (Option B).
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T/F : a device driver is a program that controls a device attached to the computer.
True. Another device driver is an application of software that manages an associated device's connection to the computer.
Describe a computer.A machine is a computing device typically accepts data in the manner of digitally enhanced data and processes it in accordance with a program, piece of software, or set of directions that specify how the information should be handled. Data is replicated from the main memory of the computer, then it is transferred to the hard drive. The range of equipment that writes data toward the disk is known as the drive.
How are computers operated?A computer, an electronic information device, functions by transforming information into binary data (ones and zeros), which are then rearranged into sentences or actions using simple arithmetic.
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a mechanism to ensure that phi has not been altered or destroyed inappropriately has been established. this mechanism is protecting:
The correct option is A. A mechanism to ensure that PHI has not been altered or destroyed inappropriately has been established. This process is called integrity.
In Archaic and Classical Greek, it represented an aspirated voiceless bilabial plosive, which was the beginning of its typical romanization as ⟨ph⟩.
PHI stands for included fitness facts. The HIPAA Privacy Rule presents federal protections for non-public fitness facts held through protected entities and offers sufferers an array of rights with recognition of that information. The golden ratio or golden imply, represented by way of the Greek letter phi (ϕ), is an irrational variety that approximately equals 1.618. The golden ratio results when the ratio of numbers is the same as the ratio of their sum to the bigger of the two numbers.
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Complete Question:
A mechanism to ensure that PHI has not been altered or destroyed inappropriately has been established. This process is called
A). integrity.
B). audit controls.
C). access control.
D). entity authentication.
8.97 dm^3 of hydrogen gas is collected at 38.8 degrees celsius. Find the volume of the gas will occupy at -39.9 degrees celcius if the pressure remains constant
The volume of the gas will occupy at -39.9°C if the pressure remains constant is 6.71dm³.
How to calculate volume?The volume of a given mass of gas can be calculated using Charles's law equation as follows:
V₁/T₂ = V₂/T₂
Where;
V₁ and T₁ = initial volume and temperatureV₂ and T₂ = final volume and temperatureAccording to this question, 8.97dm³ of hydrogen gas is collected at 38.8°C. The volume can be calculated as follows:
8.97/311.8 = V/233.1
0.029 × 233.1 = V
V = 6.71dm³
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The volume of the hydrogen gas that will occupy -39.9 degrees Celsius if the pressure is kept constant is 6.71 dm³
How do I determine the volume occupied at -39.9 degrees C?Volume occupied by a gas at constant pressure can be obtained by using Charles' law equation as illustrated below:
Initial volume of hydrogen gas(V₁) = 8.97 dm³ Initial temperature (T₁) = 38.8 degree C = 38.8 + 273 = 311.8 KFinal temperature (T₂) = -39.9 degree C = -39.9 + 273 = 233.1 KFinal volume of hydrogen gas (V₂) =?V₁ / T₁ = V₂ / T₂
8.97 / 311.8 = V₂ / 233.1
Cross multiply
311.8 × V₂ = 8.97 × 233.1
311.8 × V₂ = 2090.907
Divide both side by 311.8
V₂ = 2090.907 / 311.8
V₂ = 6.71 dm³
Thus, we can conclude from the above calculation that the volume occupied by the gas is 6.71 dm³
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Two rectangular tanks contain air that have a constant temperature and are connected by a single valve. one tank is holding moist air, while the other is holding dry air. once the valve is opened, what is most likely to happen?
When the valve between two rectangular tanks containing air with varying moisture levels is opened, the air in the tanks mixes and reaches thermodynamic equilibrium.
This means that the air will reach a point where the pressure, temperature, and moisture content in both tanks are equal, and no further moisture transfer will occur.
In this case, the air in the lower moisture content tank will absorb moisture from the air in the higher moisture content tank, until both tanks contain air with the same moisture content. This occurs because the air in the tank with the lower moisture content has a higher affinity for moisture and will thus attract moisture from the tank with the higher moisture content.
In general, the air in the dry air tank will become moister, while the air in the moist air tank will become drier until both tanks contain air with the same moisture content.
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the mass ratio of sodium to fluorine in sodium fluoride is 1.21:1. a sample of sodium fluoride produced 23.4 g of sodium upon decomposition. part a how much fluorine (in grams) was formed?
The amount of fluorine formed from 23.4 g of sodium after decomposition at a 1.21:1 sodium fluoride ratio is 18.51 grams
The decomposition reaction of sodium fluoride is an equilibrium reaction. An equilibrium reaction is a reversible reaction in which the products of the reaction can react again to form the reactants. The equilibrium reaction occurs in a closed chamber/container.
The state of equilibrium in an equilibrium system is stable if there is no influence from the outside system. If an influence (action) is applied to the equilibrium, the system will shift toward the new equilibrium.
One factor shifting the balance is concentration. If the concentration of the reactants is added, the equilibrium will shift towards the formation of products.
1.21:1 = 22.4 ÷x (where x is the amount of fluorine produced)
So,
x = 22.4/1.21 = 18.51 gram
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in oder to break a bond, energy must be ?
a released
b removed
c absorbed
d produced
the half life of phosphorus-33 is 25 days. How much of a 128 g sample will remain after 140 days?
a) 2.6
b) 2.0
c) 1.0
d) 8.0
The amount of a radioactive sample remaining after any given time can be calculated using the equation A=A0*(1/2)^n, where A is the amount remaining, A0 is the initial amount, and n is the number of half-lives passed.
In this case, A0 = 128 g, n = 5.6 (140 days / 25 days = 5.6).
A = 128 * (1/2)^5.6 = 2.0 g
What is radioactive?
Radioactive is a term used to describe certain elements that emit radiation, typically alpha and beta particles or gamma rays. These elements are unstable and have excess energy, which they release in the form of radiation to become more stable. Radioactive elements have a variety of uses, such as in medical imaging, smoke detectors, and the production of nuclear energy. Radioactivity is also used in carbon dating and to date geological samples. Radioactive elements can be found in nature, but can also be created artificially in nuclear reactors or particle accelerators. These materials can be dangerous if not handled properly, and long-term exposure to radiation can have serious health consequences.
Therefore, option B is correct.
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which of the substances have a standard enthalpy of formation, δh∘f, equal to zero?
All elements have a standard enthalpy of production of zero because the formation of any element in its reference state such as oxygen gas or solid carbon in the form of graphite involves no change.
What are elements?The fundamental components of matter and the purest type of chemical substances are known as elements. They are categorised as chemicals that cannot be chemically broken down into simpler substances.
The enthalpy change that occurs when one mole of a substance is created from its constituent elements in their standard states is known as the standard enthalpy of formation, or hf. The most stable state of an element at a certain temperature and pressure is called the standard state.
The elements are found in their standard states and have a standard enthalpy of production of zero. This is because there is no energy change when an element is formed from its component atoms, and the enthalpy change is consequently equal to zero.
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It will turn out that the fundamental ideas behind kinetic theory do not apply equally well to every kind of gas. We will learn why soon, but if you had to make an educated guess, which of these gases best follows kinetic theory?A) Benzene (C6H6)B) IodineC) HeliumD) Hemoglobin, a massive protein that shepherds iron around the bloodstream.
The gas that most closely adheres to the principles of kinetic theory is helium. This is due to the fact that helium is an atom with a low mass and a straightforward structure, making it an excellent instance of an ideal gas.
Explain helium gas.He is the symbol for the element helium, which is a colorless, colorless, and odorless gas with a number of protons. After hydrogen, helium is the second-most abundant in the universe, making up around 24% of its weight.
What purpose does helium gas serve?For welding metals like aluminium, helium is utilized as an inert gas environment. It is also employed in rocketry
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