Answer:
The bond order between carbon and oxygen in carbon dioxide (CO2) is two.
The Lewis structure of CO2 shows that each of the two double bonds (C=O) consists of one sigma bond and one pi bond. The bond order is the number of electron pairs being shared by a pair of atoms in a molecule, divided by the number of chemical bonds between the same pair of atoms. In CO2, there are two double bonds between carbon and oxygen, and each double bond has a bond order of 2. Therefore, the overall bond order between carbon and oxygen in CO2 is 2.
Al + O2 ---> Al2O3 Balance the chemical equation.
Responses
Answer:
See the attachment.
Explanation:
Complete and balance each combustion reaction.
1.Si(s)+O2(g)→
2.C9H20(l)+O2(g)→
3.C4H10O(l)+O2 (g)→
4.SiC(s)+O2(g)→
The balanced combustion reactions are: 1. 2 Si(s) + O₂(g) → 2 SiO₂(s) 2. C₉H₂0(l) + 14 O₂(g) → 9 CO₂(g) + 10 H₂O(g)
3. C₄H₁₀O(l) + 6 O₂(g) → 4 CO₂(g) + 5 H₂O(g)
4. SiC(s) + 2 O₂(g) → SiO₂(s) + CO₂(g)
What is Combustion Reaction?A combustion reaction is a chemical reaction that occurs between a fuel (such as a hydrocarbon) and an oxidizing agent (usually oxygen) to produce heat and usually light in the form of a flame. During the reaction, the fuel is oxidized, and carbon dioxide and water vapor are produced as waste products.
Combustion reactions are exothermic, which means they release energy in the form of heat. They are often used to produce energy in engines and power plants, as well as in various industrial processes. Combustion reactions are also important in the environment, as they play a role in the carbon cycle and can contribute to air pollution when incomplete combustion occurs.
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Calculate the Gibbs energy for K = 8.2 x 10-11, T = 35˚C
To calculate the Gibbs energy, we need to use the equation:
ΔG = -RT ln(K)
where:
ΔG = Gibbs energy
R = gas constant (8.314 J/mol·K)
T = temperature in Kelvin (35°C = 308.15 K)
K = equilibrium constant
Substituting the values given, we get:
ΔG = -(8.314 J/mol·K)(308.15 K) ln(8.2 x 10^-11)
ΔG = - (8.314 J/mol·K)(308.15 K) (-23.268)
ΔG = 6,415.18 J/mol
Therefore, the Gibbs energy for K = 8.2 x 10^-11 and T = 35°C is 6,415.18 J/mol.
Need help
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5. Why did Murray Gell-Mann, George Zweig, and other scientists need to develop the Standard Model?
What's Next?
This selection is only a brief introduction to the subatomic world of quarks and leptons. For example, why are some quarks strange and others charmed? Why must they always combine in twos or threes? How in the world did physicists discover something as tiny as a neutrino? Do some research to find out.
Murray Gell-Mann, George Zweig, and other scientists developed the Standard Model of particle physics to explain and unify the behavior of subatomic particles, which are the fundamental building blocks of matter.
Why a standard model?Prior to the development of the Standard Model, physicists had discovered a large number of subatomic particles and had organized them into a confusing and seemingly chaotic menagerie. There were mesons, baryons, hadrons, leptons, and many other types of particles, each with their own unique properties and behaviors. It was unclear how all these particles fit together or what underlying principles governed their behavior.
The Standard Model provided a framework for understanding the behavior of subatomic particles based on a set of fundamental particles and forces. According to the Standard Model, all matter is made up of six types of quarks, six types of leptons, and four fundamental forces: the strong nuclear force, the weak nuclear force, electromagnetism, and gravity. These particles and forces are described by a set of equations that can be used to predict their behavior in a wide range of situations.
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Which of the following is a means of creating a buffer of H₂CO₃/NaHCO₃?
Answer: Mixing a solution of H₂CO₃ and NaHCO₃ in water at the appropriate ratios is a means of creating a buffer of H₂CO₃/NaHCO₃.
Enjoy the answer!
Explanation:
A solution which can resists change in its pH value even when small amount of acid or base are added to it is called the buffer solution. Based on pH, buffer are of two types acidic and basic buffer. The given buffer is an acidic buffer. The correct option is A.
What is an acidic buffer?An acidic buffer is prepared by mixing solutions of a weak acid and its salt from a strong base in suitable proportions. An equimolar mixture of acetic acid and sodium acetate solutions forms an acidic buffer. It maintains the pH around 4.74.
The mixture of H₂CO₃ and NaHCO₃ acts as an acidic buffer solution. In the presence of NaHCO₃ , the concentration of salt increases. So the term log [salt]/[acid] also increases. The given mixture contains an acid and a conjugate base. So it is an excellent buffer.
H₂CO₃/NaHCO₃ maintains pH of our blood.
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I CHOSE THE WRONG SUBJECT SORRY
Photosynthesis and cellular respiration have a unique relationship in that the products of one are the reactants of the other. Evaluate the model provided. The reactants and products are missing from the diagram. Select ALL of the answers below that correctly pair the letter on the diagram with the product or reactant.
A) A is sunlight.A is sunlight.
B) D is ATP.D is ATP.
C) B is H2O.
D) C is CO2 + C6H12O6.C is CO 2 + C 6 H 12 O 6 .
E) F is CO2 + H2O.
The correct answers are A, B, C, D, and E. A is sunlight, D is ATP, B is H2O, C is CO2 + C6H12O6, and F is CO2 + H2O.
What is the connection between photosynthesis' end product and cellular respiration?In cellular respiration, the products and reactants for photosynthesis are switched around: Carbon dioxide and water, which are byproducts of cellular respiration, are the reactants in photosynthesis. Oxygen and sugar, byproducts of photosynthesis, are the reactants of cellular respiration.
What ingredients make up the cellular respiration equation's reactants and products?The reactants are oxygen and glucose, and the products are carbon dioxide, water, and energy.
What components make up the chemical reaction that gives my cells their energy?The reactants in the process of cellular respiration are oxygen and glucose. ATP is the primary product of cellular respiration, and carbon dioxide and water are waste products.
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Determine the % ionization of the following drugs at the specified pH. (i) A basic drug, pKb of 8.2, pkw of 14 and physiological pH of 7.4 (ii) Acidic drug, pKa 5.1 and pH 6.2.
(i). The % ionization of the basic drug at a pH of 7.4 is: % ionization = 16.6%. (ii). The % ionization of the acidic drug at a pH of 6.2 is: % ionization = 71.5%
How did we get these values?(i) To determine the % ionization of a basic drug at a pH of 7.4, we need to compare the drug's pKb to the pH of the environment. The pKb is the negative logarithm of the drug's base dissociation constant, which measures the drug's tendency to accept protons and become ionized.
At a pH of 7.4, which is lower than the pKb of 8.2, the drug will be partially ionized. The degree of ionization can be calculated using the Henderson-Hasselbalch equation:
pH = pKb + log([A-]/[HA])
where [A-] represents the concentration of the ionized form of the drug and [HA] represents the concentration of the unionized form of the drug.
Solving for [A-]/[HA], we get:
[A-]/[HA] = 10^(pH-pKb) = 10^(7.4-8.2) = 0.1995
Therefore, the % ionization of the basic drug at a pH of 7.4 is:
% ionization = [A-]/([A-] + [HA]) x 100% = 0.1995/(0.1995 + 1) x 100% = 16.6%
(ii) To determine the % ionization of an acidic drug at a pH of 6.2, we need to compare the drug's pKa to the pH of the environment. The pKa is the negative logarithm of the drug's acid dissociation constant, which measures the drug's tendency to donate protons and become ionized.
At a pH of 6.2, which is higher than the pKa of 5.1, the drug will be partially ionized. The degree of ionization can be calculated using the Henderson-Hasselbalch equation:
pH = pKa + log([A-]/[HA])
where [A-] represents the concentration of the ionized form of the drug and [HA] represents the concentration of the unionized form of the drug.
Solving for [A-]/[HA], we get:
[A-]/[HA] = 10^(pH-pKa) = 10^(6.2-5.1) = 2.5119
Therefore, the % ionization of the acidic drug at a pH of 6.2 is:
% ionization = [A-]/([A-] + [HA]) x 100% = 2.5119/(2.5119 + 1) x 100% = 71.5%
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If you calculate the percent completion of elements in a compound is there enough information to determine the empirical formula for the compound
Answer:
Combustion analysis
Explanation:
Combustion analysis can only establish a compound's empirical formula; it cannot establish the compound's molecular formula.
What is needed for coal to form?
___________________________
(any wrong/spams answers will be reported)
(brainliest will be given to the correct answer)
___________________________
(A) water and sunlight
(B) high pressure and heat
(C) heat and sunlight
(D) high pressure and sunlight
high pressure and heat is needed for coal to form
The correct answer is (B) high pressure and heat.
Coal is a fossil fuel that forms over millions of years from dead plant material. The process of coal formation begins with the accumulation of organic matter, such as leaves, branches, and other plant material, in a low-oxygen environment, such as a swamp or bog.Over time, the weight of the sediment above the organic matter compresses it and the heat from the earth's core increases the temperature, causing chemical and physical changes to occur. This process, known as coalification, results in the formation of different types of coal, such as lignite, sub-bituminous, bituminous, and anthracite, depending on the degree of heat and pressure applied.
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How many moles of NH3(g) are produced when 12 moles of H2(g) are consumed?
Answer:
there are 0.5 molecules of hydrogen
Which one is it
london dispersion forces (LDF)
dipole-dipole
hydrogen bonding
Hydrogen bonds are the sort of intermolecular force present in the sample molecule.
Hydrogen bondsA hydrogen atom develops a strong dipole-dipole contact with another electronegative atom in a neighboring molecule when it is covalently bound to a strongly electronegative element (such as nitrogen, oxygen, or fluorine). This is known as hydrogen bonding.
The electronegative oxygen atom in the given molecule, which can also establish a hydrogen bond with another electronegative atom (such as another oxygen or nitrogen atom) in an adjacent molecule, is bound to the hydrogen atoms attached to the carbon atom in the middle.
London dispersion forceAll molecules, even nonpolar ones, experience London dispersion forces (LDF), a sort of intermolecular interaction. Polar molecules engage in dipole-dipole interactions, whereby the positive end of one molecule attracts the negative end of another. Although this molecule is capable of LDF and dipole-dipole interactions, hydrogen bonding is the most powerful intermolecular force because of how polar the oxygen-hydrogen bond is.learn more about London dispersion force here
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The equilibrium constant for the reaction Ni(s) + 4CO(g) ® Ni(CO)4(g) is 3.0 104 at 25°C. What
is the equilibrium constant for the reaction Ni(CO)4(g)
Ni(s) + 4CO(g)?
The reaction quotient at chemical equilibrium is K=2.0 105; regardless of the initial concentrations, the equilibrium constant is constant for the given reaction.
What factors affect the equilibrium constant's value?Temperature-dependent equilibrium constants are unaffected by the amount of a reaction, the presence of a catalyst, or inert substances. Moreover, it is unaffected by reactant quantities, pressures, or concentrations. In general, the reaction determines how much the equilibrium constant depends on temperature.
What characteristics does the equilibrium constant have?The balanced equation's form determines the equilibrium constant for a reaction. K is inverted if the equation is turned around. K is increased to the nth power if the equation is multiplied by n different factors.
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3
new vo ime of the balloon? Round your answer to two decimal places.
Answer 78.75
L
1 point
A balloon than can hold 85 L of air is inflated with 3.5 moles of gas at 1 atmosphere. What is the temperature of the balloon? Round your answer
to two decimal places.
DE
The temperature of balloon when it can hold 85 L of air is inflated with 3.5 moles of gas at 1 atmosphere is 295.8K
Given the volume of air in balloon (V) = 85L
The pressure of air (P) = 1atm
The number of moles of gas (n) = 3.5
Let the temperature of the balloon = T
We know that from ideal gas equation: PV = nRT where R is the gas constant = 0.0821 atm*L/mol*K. The Ideal Gas Law is an equation of state that describes the behavior of a gas as an ideal gas.
So, by substituting the values we get:
1 * 85 = 3.5 * 0.0821 * T
T = 295.8K
Hence the required temperature of balloon is 295.8K
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A tank contains 33.6 L of helium gas at STP. how many moles of HE gas are in the tank?
23. The acid catalyzed decomposition of hydrogen peroxide is a first order reaction with the rate constant given below. For an experiment in which the starting concentration of hydrogen peroxide is 0.110 M, what is the concentration of H₂O2 450 minutes after the
reaction begins?
2H2O2 → 2H₂O +0₂ k-1.33 x 10-4 min-1
a) 0.0961 M
b) 0.104 M
c) 0.117 M
d) 0.00658 M
e) 0.0156 M
An experiment in which the starting concentration of hydrogen peroxide , the concentration of H₂O₂ 450 minutes after the reaction started is 0.104 M.
Option B is correct.
What is a first-order reaction?A chemical reaction of the first order in which the rate of the reaction is solely determined by the concentration of a single reactant raised to the first power is known as a first-order reaction. To put it another way, the concentration of the reactant has a direct bearing on the rate of the reaction.
The rate law for a first-order reaction can be obtained by:
rate = k[H₂O₂]
The rate constant for the acid-catalyzed breakdown of hydrogen peroxide, k = 1.33 x 104 min1, is given to us. The integrated rate law for a first-order reaction must be utilized in order to ascertain the H₂O₂ concentration after 450 minutes:
ln([H₂O₂]t/[H₂O₂]0) = -kt
where [H₂O₂]t is the concentration of H₂O₂ at time t, [H₂O₂]0 is the initial concentration of H₂O₂, k is the rate constant, and t is time. Solving for [H₂O₂]t, we get:
[H₂O₂]t = [H₂O₂]0
Substituting the given values, we get:
[H₂O₂]450 = 0.110 M e⁻¹.³³ˣ¹⁰⁻⁴ˣ⁴⁵⁰
[H₂O₂]450 = 0.104 M
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List five types of chemical reactions
Write short notes and give a representative balanced chemical equation in each of the type of chemical reaction mentioned in the above statemeny
Name two types of salts.
List four methods of preparing salts and give a representative balanced chemical equation in each case.
Answer:
Combination reactions: In this type of reaction, two or more substances combine to form a single product. The general form of the equation is A + B → AB. An example of a combination reaction is:
2Na + Cl2 → 2NaCl
Decomposition reactions: In this type of reaction, a single reactant breaks down into two or more products. The general form of the equation is AB → A + B. An example of a decomposition reaction is:
2H2O → 2H2 + O2
Single replacement reactions: In this type of reaction, one element replaces another element in a compound. The general form of the equation is A + BC → AC + B. An example of a single replacement reaction is:
Zn + CuSO4 → ZnSO4 + Cu
Double replacement reactions: In this type of reaction, two compounds exchange ions to form two new compounds. The general form of the equation is AB + CD → AD + CB. An example of a double replacement reaction is:
NaCl + AgNO3 → NaNO3 + AgCl
Combustion reactions: In this type of reaction, a substance reacts with oxygen to produce heat and light. The general form of the equation is A + O2 → CO2 + H2O. An example of a combustion reaction is:
C3H8 + 5O2 → 3CO2 + 4H2O
Two types of salts are:
Acid salts: These are salts that contain hydrogen ions. An example of an acid salt is sodium hydrogen sulfate (NaHSO4).
Basic salts: These are salts that contain hydroxide ions. An example of a basic salt is copper(II) hydroxide carbonate (Cu2(OH)2CO3).
Four methods of preparing salts and their balanced chemical equations are:
Acid-base reaction: This involves the reaction of an acid and a base to produce a salt and water. The general form of the equation is acid + base → salt + water. An example of an acid-base reaction is:
HCl + NaOH → NaCl + H2O
Precipitation reaction: This involves the reaction of two solutions to produce an insoluble salt, which can be collected by filtration. The general form of the equation is A + B → AB(s). An example of a precipitation reaction is:
AgNO3 + NaCl → AgCl(s) + NaNO3
Direct combination: This involves the reaction of two elements to produce a salt. The general form of the equation is A + B → AB. An example of direct combination is:
Sodium + chlorine → sodium chloride
Neutralization reaction: This involves the reaction of an acid and a base to produce a salt and water. The general form of the equation is acid + base → salt + water. An example of a neutralization reaction is:
H2SO4 + 2NaOH → Na2SO4 + 2H2O
Explanation:
What mass of Mg(OH)₂ in grams are in 215 mL of a 0.350 M solution of Mg(OH)₂?
The mass of [tex]Mg(OH)2[/tex] in a 215 mL of a 0.350 M solution is 4.386 kg where the number of moles is 75.25.
Given the volume of solution of [tex]Mg(OH)2[/tex]= 215mL
The concentration of solution of[tex]Mg(OH)2[/tex]= 0.350M
Let the mass of [tex]Mg(OH)2[/tex] solution = m
We know the mass of solution by calculating the number of moles of substance. Since we are given the volume of the solution (215 mL) and the molarity (0.350 M), we can calculate the number of moles of [tex]Mg(OH)2[/tex]using the formula M = n/V, where M is molarity, n is the number of moles, and V is the volume.
n = M x V
n = 0.350 * 215 = 75.25 moles of [tex]Mg(OH)2[/tex]
Now that we know the number of moles of [tex]Mg(OH)2[/tex], we can calculate the mass of [tex]Mg(OH)2[/tex] in the solution.
Mass = n x Molar Mass
the molar mass of [tex]Mg(OH)2[/tex] = (58.32 g/mol)
Mass = 75.25 moles x 58.32 g/mol
Mass = 4.386 kg of [tex]Mg(OH)2[/tex]
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What volume of oxygen is produced at STP when 6.58 x 1024 molecules of water is decomposed according to the following reaction?
2 H2O → 2 H2 + O2
What mole ratio would need to be used when completing step 2 of this conversion?
options:
2 molecules of H2O/1 molecule of O2
2 molecules of H2O/2 molecules of H2
1 molecule of O2/ 2 molecules of H2O
2 molecules of H2 /1 molecule of O2
So, 5.47 x 22.4 = 122 L has now become the volume of oxygen.
What is the volume of oxygen?Depending on the type of combination and where the carbon atom is attached, oxygen can be divided into three volumes: 251, 445, and 753.
How can you figure out volume?You really do have to know a box's height, breadth, and depth in order to determine its volume. These three dimensions can be multiplied to determine the volume.
The volume of a three-dimensional item is expressed in cubic units and represents the amount of space it occupies. On the other hand, an item's mass can be used to calculate how much matter it contains. The most frequent method of calculating mass is by weighing an object (in units like pounds or kilograms).
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Calculate the number of moles of each substance.
a. 5.45 x 1026 molecules of methane, CHA
b. 3.22 x 1023 atoms of xenon, Xe
c. 9.6 x 1023 formula units of sodium chloride, NaCl
The volume of a gas is 325 mL when the temperature is 57°C. If the temperature is reduced to 10°C without changing the pressure, what is the new volume of the gas? Combined gas law 2 P₁V₁ T₁ P₂V2 T2 = 278.7 mL
Answer:
The new volume of the gas is 278.7 mL.
Explanation:
To solve this problem, we can use the combined gas law:
P₁V₁/T₁ = P₂V₂/T₂
where P is the pressure, V is the volume, and T is the temperature.
We can start by plugging in the given values for the initial state of the gas:
P₁ is not given, so we can assume it remains constant.
V₁ = 325 mL
T₁ = 57°C + 273.15 = 330.15 K
Now we can solve for P₂V₂/T₂:
P₂V₂/T₂ = P₁V₁/T₁
We want to solve for V₂, so we can rearrange the equation:
V₂ = (P₁V₁/T₁) * T₂/P₂
We are given that the pressure remains constant, so P₁ = P₂.
Now we can plug in the remaining values:
V₂ = (P₁V₁/T₁) * T₂/P₂
V₂ = (P₁ * 325 mL / 330.15 K) * (10°C + 273.15) / P₁
V₂ = 278.7 mL
Therefore, the new volume of the gas is 278.7 mL.
Hope I helped you!
in hot and dry climates, fountains of gently dripping water are often used to cool courtyards. Explain hwo FAST
In hot and dry climates, fountains of gently dripping water can be effective in cooling courtyards and providing a more comfortable outdoor environment. This is primarily due to two main cooling mechanisms: evaporative cooling and thermal mass.
Evaporative cooling: When water evaporates, it absorbs heat from its surroundings, causing the temperature to drop. In a hot and dry climate, the air has a low relative humidity, which allows for more evaporation to occur. As the water in the fountain evaporates, it takes in heat from the surrounding air, lowering the air temperature. This cooling effect is particularly pronounced in areas with good airflow, as the movement of air helps to disperse the cooler air and increase evaporation.
Thermal mass: Water has a high heat capacity, meaning it can absorb and store a large amount of heat energy without undergoing significant changes in temperature. As the water in the fountain absorbs heat from the surrounding air and surfaces, it helps to keep the courtyard temperature cooler than it would be without the water. The cool water can then release its stored heat energy slowly during the night when temperatures drop, providing a more stable and comfortable outdoor temperature over a 24-hour period.
Additionally, fountains can help create a more pleasant atmosphere in courtyards by providing a visual and auditory focal point. The sight and sound of gently dripping water can be soothing and calming, making the space more enjoyable and inviting.
How many atoms are in 3.47 g Li?
The molar mass of Li is 6.94 g/mol.
A. 3.01 x 10²³ atoms Li
B. 8.31 x 10-25 atoms Li
C. 0.50 atoms Li
D. 1.45 x 1025 atoms Li
PH
3.47 moles Li is made up of 3.01x1023 atoms. The cubic body-centered structure of lithium metal. Its molarity is 6.94 g mol1, and its dense is 0.53 g cm3. Determine the lithium metal unit cell's edge.
Correct option is, A.
Is the mass number of lithium seven?Lithium has a mass number of 7. Every element's mass number is equal to the sum of its protons and neutrons. With data from the Cyclic Table of Elements, you can calculate the number if neutrons, protons, or the mass number of each element. Since lithium has a 3 atomic number, that has 3 protons.
Where is lithium-7 produced?Lithium-7 is a stable (non-radioactive) isotope of the metal lithium. Both naturally occuring and produced by fission. Lithium 7 metal is one of the almost 250 metal based isotopes that American Element produces for base material, biological and medical tagging, or other purposes.
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A gas mixture in a 1.60 L
at 310 K
container contains 10.0 g
of Ne
and 10.0 g
of Ar
.
The partial pressure of Ne in the container is 7.70 atm, and the partial pressure of Ar is 3.90 atm.
option C.
What is the partial pressure of the gases?To calculate the partial pressure of Ne and Ar in the container, we need to 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.We can first calculate the number of moles of Ne and Ar:
n(Ne) = 10.0 g / 20.18 g/mol = 0.495 mol
n(Ar) = 10.0 g / 39.95 g/mol = 0.250 mol
The total number of moles of gas in the container is:
n(total) = n(Ne) + n(Ar) = 0.495 mol + 0.250 mol = 0.745 mol
We can now use the ideal gas law to calculate the total pressure of the gas mixture:
P(total) = (n(total) * R * T) / V
Plugging in the values, we get:
P(total) = (0.745 mol * 0.08206 Latm/molK * 310 K) / 1.60 L = 11.6 atm
The partial pressure of Ne and Ar can be calculated using their mole fraction in the gas mixture:
X(Ne) = n(Ne) / n(total) = 0.495 mol / 0.745 mol = 0.664
X(Ar) = n(Ar) / n(total) = 0.250 mol / 0.745 mol = 0.336
The partial pressure of Ne and Ar are:
P(Ne) = X(Ne) * P(total) = 0.664 * 11.6 atm = 7.70 atm
P(Ar) = X(Ar) * P(total) = 0.336 * 11.6 atm = 3.90 atm
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Sodium-24, which is used to locate blood clots in the human circulatory system, has a half-life of 15.0 h
. A sample of sodium-24 with an inital mass of 20.0
g was stored for 45.0 h
. How many grams of sodium-24 are left in the sample after 45.0 h
2.5 g of sodium-24 will still be present in the sample after 45.0 hours.
What is sodium?The chemical element sodium has the atomic number 11 and the symbol Na. It is an alkali metal, which is a soft, silvery-white, highly reactive group of elements. The Earth's crust is rich in sodium, which can be found in a variety of minerals like sodalite and halite (rock salt).
How do you determine it?The sodium-24 half-life is 15.0 hours, which indicates that after 15.0 hours, only 50% of the initial sodium-24 concentration will be present. This data allows us to calculate how much sodium-24 is still present after 45.0 hours.
The number of half-lives that have transpired throughout the 45.0-hour timeframe must first be determined:
45.0 h / 15.0 h/half-life = 3 half-lives
As a result, there will be the following amount of sodium-24 after 45.0 hours:
(1/2)^3 x initial amount of sodium-24 = (1/8) x 20.0 g = 2.5 g
Hence, 2.5 g of sodium-24 will still be present in the sample after 45.0 hours.
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18. Why do metal cooking utensils have plastic handles to protect your hands from
heat?
A. Metal is an insulator, and the heat doesn't pass through it.
B. Metal contains more air pockets than plastic.
C. Metal isn't a good conductor, but plastic is.
D. Metal easily conducts heat, but plastic doesn't.
Answer: D. Metal easily conducts heat, but plastic doesn't.
Explanation: because plastic is a bad conductor of heat so the metallic pans are provided with handles made up of plastic to avoid hands getting burned due to the heat of the pan.
Question 3 (1 point)
A neutral atom has 14 protons and 18 neutrons. Choose the correct nuclide symbol
for this atom (1 point).
a. 3218 Ar
A
B
C
D
b. 32 14 Si
C. 181
14 Si
d. ¹32 Ge
14
The correct nuclide symbol for this atom is: D. ¹³²⁴⁶Ge, where ¹³² is the mass number (protons + neutrons) and ⁴⁶Ge is the chemical symbol for the element germanium, which has 32 protons.
What is atom?An atom is the basic unit of matter, consisting of a nucleus composed of protons and neutrons, surrounded by a cloud of negatively charged electrons. The protons and neutrons are located in the nucleus at the center of the atom and are collectively known as nucleons. The number of protons in the nucleus determines the atomic number of the atom, which in turn determines the identity of the element. Each element has a unique atomic number, and the elements are arranged in the periodic table in order of increasing atomic number. Electrons are negatively charged particles that orbit the nucleus in shells or energy levels. The number and arrangement of electrons in an atom's shells determine its chemical and physical properties, such as reactivity, conductivity, and melting point.
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“HELP”
Consider the homogeneous equilbrium reaction of gaseous compound "A" to produce gaseous compound "B" :
2A (g) <--> 3B (g)
(<--> is the double headed equilibrium arrow)
A flask is filled with 1.608 M of A and 1.135 of B. This flask is then allowed to reach equilbrium. At that point the flask contains an equilbrium amount of B equal to 0.533 M. What is the equilibrium molarity of compound "A" ?
When the reactants and products of a chemical reaction are in equilibrium, the reaction is referred to as an equilibrium reaction.
When the rate of products becoming reactants is equal to the rate of reactants becoming products, equilibrium has been reached. Chemical equilibrium has four requirements:
Close the computer system.Dynamic reactions are required.Reactions in both directions are equal.Lastly, the ratio of reactants to products must remain constant.Practically speaking, these conditions indicate that the reaction cannot absorb or lose substances (gases, liquids, etc.) from the environment. There must be a response that has both a forward and a backward reaction that can counterbalance one another. Both reactants and products must be present in the reaction.
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A 57.0 mL portion of a 1.20 M solution is diluted to a total volume of 208 mL. A 104 mL portion of that solution is diluted by adding 193 mL of water. What is the final concentration? Assume the volumes are additive.
The final concentration of the solution is 1.54 M. The quantity of solute present per 100 ml of the solution is considered the solution's concentration.
What is a solution's concentration?The amount of solute that has been dissolved in a specific volume of solvent or solution is measured by the solution's concentration. There are a lot of dissolved solutes in a concentrated solution.
To find the final concentration,
we can calculate the concentration of the initial solution:
C1V1 = C2V2
where C1 = initial concentration, V1 = initial volume, C2 = final concentration, and V2 = final volume.
We can solve for C1:
C1 = (C2V2) / V1
Substitute the values,
C1 = (1.20 M * 208 mL) / 57.0 mL
C1 = 4.40 M
the initial concentration of the solution was 4.40 M.
Now we need to calculate the final concentration of the solution after diluting a 104 mL portion with 193 mL of water
C1V1 = C2V2
where C1 = initial concentration (4.40 M), V1 = initial volume (104 mL), C2 = final concentration, and V2 = final volume (104 mL + 193 mL = 297 mL).
We can solve for C2:
C2 = (C1V1) / V2
C2 = (4.40 M * 104 mL) / 297 mL
C2 = 1.54 M
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Hydrogen and iodine gas combine to form hydrogen iodide gas.
H2 (g) + I2 (g) ⇌ 2 HI (g)
At a certain temperature, the equilibrium concentration of hydrogen and iodine gas are 0.291 M and 0.172 M, respectively. At this temperature, the equilibrium constant, Kc, is 30.6. What is the concentration of hydrogen iodide gas under these conditions?
At a certain temperature, the equilibrium concentration of hydrogen and iodine gas are 0.291 M and 0.172 M, respectively. At this temperature, the equilibrium constant, Kc, is 30.6. The concentration of hydrogen iodide gas under these conditions is 1.24 M.
What is equilibrium constant?When a chemical process reaches equilibrium, the equilibrium constant (often represented by the letter K) sheds light on the interaction between the reactants and products. For instance, the ratio of the concentration of the products to the concentration of the reactants, each raised to their respective stoichiometric coefficients, can be used to establish the equilibrium constant of concentration (denoted by Kc) of a chemical reaction at equilibrium.
At equilibrium, Rate of the forward reaction = Rate of the backward reaction.
For the reaction,
H₂(g) + I₂(g) ⇔ 2HI(g)
K = [tex]\frac{HI^{2} }{H2*I2}[/tex]
Substituting the values and solving for [HI],
[HI] = 1.24M
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K3PO4 + Al(NO3)3 → 3KNO3 + AlPO4
How many moles of potassium nitrate, KNO3, are produced when 15.7 moles of potassium phosphate, K3PO4, react?
Answer:
K3PO4 + Al(NO3)3 → 3KNO3 + AlPO4
The stoichiometry of the reaction indicates that 1 mole of K3PO4 produces 3 moles of KNO3.
Therefore, to calculate the moles of KNO3 produced, we need to multiply the moles of K3PO4 by the stoichiometric coefficient of KNO3, which is 3:
Moles of KNO3 = 15.7 moles K3PO4 x (3 moles KNO3/1 mole K3PO4) = 47.1 moles KNO3
So, 15.7 moles of K3PO4 will produce 47.1 moles of KNO3.
Explanation: