Which specific structure in the respiratory system connects with the circulatory system for the exchange of gases?.
Answers
The specific structure in the respiratory system which connects with the circulatory system for the exchange of gases is alveoli. Alveoli are tiny sacs within the lungs that allow for rapid gaseous exchange between the air and the bloodstream.
More than 100 wordsAlveoli are an important part of the respiratory system as they are responsible for exchanging gases between the body and the environment. They are found in the lungs and are tiny sacs that are surrounded by capillaries.
Alveoli are important because they provide a large surface area for gas exchange to occur, which means that the exchange of gases can happen quickly and efficiently. The alveoli are surrounded by capillaries, which are tiny blood vessels that allow for the exchange of oxygen and carbon dioxide between the bloodstream and the air in the lungs.
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Related Questions
A wave has an energy of 305 kJ. What is the frequency of this wave in Hertz (Hz)? Use 3 Significant Digits.
Answers
What does the NaBr + Cl₂ represent
in the reaction?
NaBr + Cl₂ →>>
NaCl + Br₂
Answers
Answer:
The reactants
Explanation:
The molecules on the left side of the reaction are the reactants. Reactants are the molecules which react with one another to form something new.
The molecules on the right side of the reaction are the products. Products are the molecules that form in response to the reaction.
Calculate the heat absorbed when 516 g of ice at -14.1°C melts and then the water is converted to steam
at 145.0°C. The specific heat of ice is 2.03 J/(g°C), the heat of fusion of ice is 6.01 x 10'J/mol, the
specific heat of water is 4.18 J/(g°C), the heat of vaporization of water is 4.07 104 J/mol, and the
specific heat of steam is 2.02 J/(g°C).
J
(Enter your answer in scientific notation.)
*100)
Answers
The heat absorbed when 516 g of ice at -14.1°C melts and then the water is converted to steam at 145.0°C is approximately 1.54 × 10^6 J.
What is the heat absorbed when 516 g of ice at -14.1°C melts and the water is converted to steam at 145.0°C?To calculate the heat absorbed during the process described, we need to consider the different stages involved: melting the ice and then converting the water to steam. We'll calculate the heat absorbed at each stage and add them together.
1. Heat absorbed to melt the ice:
The formula to calculate the heat absorbed during the melting process is:
Q = m * ΔH_fusion
where Q is the heat absorbed, m is the mass, and ΔH_fusion is the heat of fusion.
Given:
Mass of ice (m) = 516 g
Heat of fusion (ΔH_fusion) = 6.01 × 10^3 J/mold (converted to J/g by dividing by the molar mass of water, 18.015 g/mold)
First, we need to calculate the number of moles of ice:
moles = mass / molar mass
moles = 516 g / 18.015 g/mold ≈ 28.63 mold
Now we can calculate the heat absorbed to melt the ice:
Q_ ice = m * ΔH_fusion
Q_ ice = 516 g * (6.01 × 10^3 J/mold / 18.015 g/mold)
Q_ ice ≈ 172,110 J
2. Heat absorbed to raise the temperature of water from 0°C to 100°C:
The formula to calculate the heat absorbed during this process is:
Q = m * C * ΔT
where Q is the heat absorbed, m is the mass, C is the specific heat capacity, and ΔT is the change in temperature.
Given:
Mass of water (m) = 516 g
Specific heat capacity of water (C) = 4.18 J/(g° C)
Temperature change (ΔT) = 100°C - 0°C = 100°C
Q_ water = m * C * ΔT
Q_ water = 516 g * 4.18 J/(g° C) * 100°C
Q_ water = 215,232 J
3. Heat absorbed to vaporize the water:
The formula to calculate the heat absorbed during vaporization is:
Q = m * ΔH_vaporization
where Q is the heat absorbed, m is the mass, and ΔH_vaporization is the heat of vaporization.
Given:
Mass of water (m) = 516 g
Heat of vaporization (ΔH_vaporization) = 4.07 × 10^4 J/mold (converted to J/g by dividing by the molar mass of water, 18.015 g/mold)
Now we need to calculate the number of moles of water:
moles = mass / molar mass
moles = 516 g / 18.015 g/mold ≈ 28.63 mold
Now we can calculate the heat absorbed to vaporize the water:
Q_ vaporization = m * ΔH_vaporization
Q_ vaporization = 516 g * (4.07 × 10^4 J/mold / 18.015 g/mold)
Q_ vaporization ≈ 1,157,714 J
Total heat absorbed:
Total Q = Q_ ice + Q_ water +Q- Vaporization
Total Q ≈ 172,110 J + 215,232 J + 1,157,714 J
Total Q ≈ 1,544,056 J
The heat absorbed when 516 g of ice at -14.1°C melts and then the water is converted to steam at 145.0°C is approximately 1.54 × 10^6 J.
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what layer of the Earth is made of liquid metal?
Answers
Answer:
the outer core
Answer:
The outer core
Antifreeze is mixed with water in a car's cooling system because the solution______????
a) has a lower, boiling point, and higher freezing point than water alone. B) will not allow the cooling system to freeze. C) makes the cars air conditioner system run cooler. D) has a higher boiling point, and lower freezing point than water alone.
Answers
Answer:
D
Explanation:
has a higher boiling point than water alone and actually lowers the freezing point
How many g of water are required to be mixed with 11.75 g of HgCl in order to make a 0.01 m solution? (Refer to the periodic table for atomic weights.)
a.) 40 g
b.) 5,000 g
c.) 2 x 10^8 g
d.) 2 x 10^6 g
The general name for a substance added to a reaction that affects the rate but is not consumed in the reaction is called a_____.
a.)constituent
b.)catalyst
c.)complex
d.)reactant
The action of a catalyst can be explained in the following manner:
a.) The catalyst makes it possible for the reaction to take place by another path that makes possible reaction at a lower energy.
b.) The catalyst takes no part in the reaction but serves as a buffer between reactants and products.
c.) The catalyst prevents the reverse reaction.
d.) The catalyst lowers the temperature of the reactants.
The energy level necessary to enable a reaction to occur is called the_____ energy.
a.) potential
b.) kinetic
c.) activation
d.) nuclear
Raising the temperature of a reacting system increases the rate of the reaction, but does NOT increase the:
a.) number of collisions
b.) average velocity of the reacting particles
c.) activation energy
d.) vibrational motions within the molecules
e.) fraction of the reacting particles which possess energies greater than the activation energy
Answers
Answer:
5,000 g
b.)catalyst
The catalyst makes it possible for the reaction to take place by another path that makes possible reaction at a lower energy.
activation
activation energy
Explanation:
Formulae for molality = number of moles of solute/mass of solvent in kilograms
Number of moles of solute= 11.75g/236 g/mol = 0.0498 moles
0.01 = 0.0498/x
x= 0.0498/0.01
x= 5 Kg or 5000 g
A catalyst refers to any substance that alters the rate of reaction but remains unaffected at the end of the reaction. The catalyst lowers the activation energy of a reaction.
For a chemical reaction to occur, the substances participating in that reaction must possess energy which is greater than the activation energy of the reaction. The activation energy is a sort of energy barrier between reactants and products which must be surmounted before a reaction can take place.
When the temperature of a reaction system is raised, the molecules move faster and the number of effective collisions in the system increases. However, raising the temperature does not raise the activation energy of the system.
are there any hydrogen bonds between the cut sites in smai? A. yes B. no
Answers
No, there is no hydrogen bonds between the cut sites in smai. The correct option is B.
The blunt ends have the Smai will create after the cutting. The hydrogen bonds are the very special class of the intermolecular attractive forces that will arise only in the compounds that is featuring the hydrogen atoms bonded to the highly electronegative atom with the other highly electronegative atom.
The hydrogen bonds are of the two types , these are as follows :
The intermolecular hydrogen bondingThe intramolecular hydrogen bondingThe Hydrogen bonding is the special type of the dipole - dipole attraction in between the molecules.
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plzzzz ...... Why is the result of CO2 bonds zero?
Answers
Answer:
this is right because carbon and oxygen complete its octet
The unknown oxalate solution was prepared by dissolving around 5 grams of sodium oxalate in 1 liter of water. This was not an exact measurement and discrepancies do arise between bottles of solution. Discuss in at least two sentences how accurate your oxalate concentration is based on this information
Answers
The oxalate concentration in the unknown solution is not accurate because the amount of sodium oxalate used to prepare the solution was not measured exactly.
Discrepancies between bottles of solution can also introduce errors, making it difficult to determine the true concentration of the oxalate. Therefore, the oxalate concentration reported in the solution may not be accurate and could vary from bottle to bottle. The accuracy of the oxalate concentration in the unknown solution cannot be determined based on the information provided.
The amount of sodium oxalate used to prepare the solution was not measured, and discrepancies between bottles of solution can also introduce errors. Therefore, it is not possible to determine the true concentration of the oxalate in the solution, and any reported concentration may not be accurate. This is because different amounts of sodium oxalate could have been used in the preparation of different bottles of the solution, leading to variations in the concentration of the oxalate.
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Calculate ΔH for the reaction CO(g) + H2(g) + O2(g) → CO2(g) + H2O(g)
Given:
2 C(s) + O2(g) → 2 CO(g)... ∆H = -222 kJ
C(s) + O2(g) → CO2(g)... ∆H = -394 kJ
2 H2(g) + O2(g) → 2H2O(g)... ∆H = -484 kJ
Answers
The value of ΔH for the reaction CO(g) + H₂(g) + O₂(g) → CO₂(g) + H₂O(g) is -1272 kJ.
To calculate the enthalpy change (ΔH) for the given reaction, we can use Hess's law, which states that the overall enthalpy change of a reaction is equal to the sum of the enthalpy changes of the individual reactions involved.
Given the enthalpy changes:
1. 2 C(s) + O₂(g) → 2 CO(g)... ∆H = -222 kJ
2. C(s) + O₂(g) → CO₂(g)... ∆H = -394 kJ
3. 2 H₂(g) + O₂(g) → 2 H₂O(g)... ∆H = -484 kJ
We need to manipulate these reactions to obtain the desired reaction:
1. Reverse reaction 2: CO₂(g) → C(s) + O₂(g)... ∆H = +394 kJ
2. Multiply reaction 2 by 2 to balance carbon atoms: 2 CO₂(g) → 2 C(s) + 2 O₂(g)... ∆H = -788 kJ
3. Leave reaction 3 unchanged: 2 H₂(g) + O₂(g) → 2 H₂O(g)... ∆H = -484 kJ
By adding reactions 2 and 3, we obtain the desired reaction:
CO(g) + H₂(g) + O₂(g) → CO₂(g) + H₂O(g)... ∆H = -788 kJ + (-484 kJ) = -1272 kJ
Therefore, the value of ΔH for the given reaction is -1272 kJ.
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A fully inflated hot air balloon has a volume of 1,840,000 liters at 100˚C. What approximate volume will the balloon have at 50˚C?
Answers
Answer:
920,000 liters
Explanation:
i divided by 2
What does the molecular structure of Y show?
Answers
Answer:
the molecular structure of y shows that it is solid
Explanation:
because in solid state atoms are tightly packed and they are attached to them closely
why does one should use naoh solution in the extraction procedure?
Answers
the use of NaOH solution in extraction procedures can help to adjust the pH of the solution, enhance the solubility of organic compounds in the aqueous layer, and help to separate different compounds based on their relative solubilities.
NaOH (sodium hydroxide) solution is often used in extraction procedures to adjust the pH of the solution and to make the organic compounds more soluble in the aqueous layer.
When an organic compound is mixed with water, it may dissolve partially or not at all due to differences in polarity between the two substances. By adjusting the pH of the solution with NaOH, the organic compounds can become more soluble in the aqueous layer because the addition of a basic solution can convert acidic functional groups in the organic compound to their conjugate bases. For example, carboxylic acids (an acidic functional group commonly found in organic compounds) can be converted to their water-soluble carboxylate salt forms by the addition of a basic solution such as NaOH.
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what materials transmits the most light waves?
Answers
Answer: what materials transmits the most light waves?
Explanation:
A saturated solution of PbBr2 is prepared by dissolving the solid salt in water. The concentration of Pb2+ in the solution is found to be 0.0115 M. What is the ksp for PbBr2?
Answers
The Ksp or solubility product of lead bromide is 6.08×\(10^{-6\)
This issue has to do with lead bromide's solubility. While calculating the solubility product, the concentration of lead ions in the solution at the point of saturation serves as a gauge of the given substance's molar solubility.
A substance's ability to dissolve in a solvent to create a solution is known as a substance's solubility. Ionic compounds, which separate into cations and anions, have a wide range of solubilities in water. While other substances are exceedingly insoluble, some are highly soluble and may even absorb moisture from the air.
\(PbBr_2\rightarrow Pb^{2+}+2Br^{-}\)
Now,
s=[(\(Pb^{2+\))]=0.0115M
[\(Br^{-\)]=2×0.0115
M=0.023M.
Ksp=s×\((2s)^2\)
Thus, Ksp=0.0115×\((0.023)^2\)=6.08×\(10^{-6\)
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What occurs during a slump?
Answers
Answer:
A slump is a form of mass wasting that occurs when a coherent mass of loosely consolidated materials or a rock layer moves a short distance down a slope.[1] Movement is characterized by sliding along a concave-upward or planar surface. Causes of slumping include earthquake shocks, thorough wetting, freezing and thawing, undercutting, and loading of a slope.
Un móvil avanza con mru a razón de 25 m/s durante 2,54 h. Cuál es la distancia recorrida por el móvil
Answers
Answer:
La distancia recorrida por el móvil es 228.600 m
Explanation:
El movimiento rectilíneo uniforme MRU es el movimiento que describe un cuerpo o partícula a través de una línea recta a velocidad constante. Es decir:, en este caso el movimiento es lineal en una única dirección y la velocidad de desplazamiento es constante.
La velocidad es una magnitud física que expresa la relación entre el espacio recorrido por un objeto y el tiempo empleado para ello mediante la expresión:
\(velocidad=\frac{distancia}{tiempo}\)
En este caso:
velocidad= 25 m/sdistancia= ?tiempo= 2,54 h= 9144 s (siendo 1 h= 3600 s)Reemplazando:
\(25 \frac{m}{s} =\frac{distancia}{9144 s}\)
y resolviendo obtienes:
distancia= 25\(\frac{m}{s}\) *9144 s
distancia= 228.600 m
La distancia recorrida por el móvil es 228.600 m
A movement is rectilinear uniform when an "object" (for example) travels in a straight path at a constant speed, given that its acceleration is zero.
To start solving an exercise, we obtain the data:Velocity (v) = 25m/s
Distance (d) = ?
Time (t) = 2.54hr = 9,144 s
Looking at the data, we see that the time is in hr, but we need it in seconds. Therefore we do a conversion from hours to minutes, taking into account that 1 hour is equal to 3600 seconds.
2,54 hr * (3600 sec / 1 h ) = 9144 secTo calculate the distance traveled by the mobile, the speed is multiplied by the time taken.
For this the following formula is applied:
d = v * tWe apply the data in the formula; to solve for the distance.
d = 25 m/s * 9144 sd = 228, 600 mAnswer: The distance traveled by the mobile is 228,600 meters.
An atom has9 electrons and 9 protons at the start. If it loses 2 electrons, what would the net charge on the atom be
Answers
Answer:
i hope it will help you
Explanation:
there will be 7 electrons and 9 protons will have 2+ charge.
the half-life of cobalt-60 is 5.3 years, while that of strontium-90 is 28 years. suppose you have a sample of each, such that they initially contain equal numbers of atoms of these nuclides. how will the activities (number of decays per second) of the samples compare?
Answers
The same amount of time, the cobalt-60 sample will have a higher activity than the strontium-90 sample because more of its atoms will have decayed. However, over time, the activity of both samples will decrease as more and more atoms decay.
The activities (number of decays per second) of the samples will not be the same. This is because the half-life of strontium-90 is longer than that of cobalt-60, which means that it takes longer for half of the atoms in the strontium-90 sample to decay. Therefore, after the same amount of time, the cobalt-60 sample will have a higher activity than the strontium-90 sample because more of its atoms will have decayed. However, over time, the activity of both samples will decrease as more and more atoms decay.
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ALOT OF POINTS !! PLEASE HELP DUE SOON!!
Mistakes to avoid using mean:
Mistakes to avoid using median:
Answers
SORRY
which of the following options correctly describe the steps required to determine the shape of a molecule? multiple select question. both bonding and nonbonding electron pairs must be considered. the lewis structure of the molecule must be drawn first. the shape of the molecule is dictated by the most stable arrangement of the outer electron pairs. only electrons that form bonds need to be considered. the most stable arrangement is the one that has the outer electron pairs as close together as possible.
Answers
The correct options that describe the steps required to determine the shape of a molecule are: both bonding and nonbonding electron pairs must be considered, the Lewis structure of the molecule must be drawn first, and the most stable arrangement of the outer electron pairs dictates the shape of the molecule.
The options "only electrons that form bonds need to be considered" and "the most stable arrangement is the one that has the outer electron pairs as close together as possible" are not entirely accurate, as nonbonding electron pairs also contribute to the shape and the most stable arrangement may not necessarily be the one where the outer electron pairs are closest together.
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Following options correctly describe the steps required to determine the shape of a molecule:
A- Both bonding and nonbonding electron pairs must be considered.
B- The Lewis structure of the molecule must be drawn first.
C- The shape of the molecule is dictated by the most stable arrangement of the outer electron pairs.
E- The most stable arrangement is the one that has the outer electron pairs as close together as possible.
It is important to consider both bonding and nonbonding electron pairs because they both contribute to the electron density around the central atom and affect the molecular shape. The Lewis structure is the starting point to determine the arrangement of the outer electron pairs, which determines the molecular shape. The most stable arrangement is the one that minimizes the repulsion between the electron pairs, which occurs when they are as close together as possible.
Only considering electrons that form bonds is not enough because nonbonding electron pairs also contribute to the electron density and affect the molecular shape.
So, options A, B, C, and E are correct.
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A second-order reaction starts with an initial concentration of 0.100 mol/L of the reactant. If the rate constant is 2.6 × 10–2 L/mol·s, what is the time required to decrease the initial concentration to 0.050 mol/L? 2A → B rate = k[A]2
Answers
The time required to decrease the initial concentration to 0.050 mol/L is 9.62 seconds.
To determine the time required for the second-order reaction to decrease the initial concentration to 0.050 mol/L, we can use the integrated rate law for a second-order reaction:
1/[A]t - 1/[A]0 = kt
Where [A]t is the final concentration, [A]0 is the initial concentration, k is the rate constant, and t is the time. Rearranging the equation, we have:
t = (1/kt) * (1/[A]t - 1/[A]0)
Plugging in the values, [A]t = 0.050 mol/L, [A]0 = 0.100 mol/L, and k = 2.6 × 10–2 L/mol·s, we can calculate the time required to be approximately 9.62 seconds.
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what do you mean by chemical reaction
Answers
Answer:
Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products.
A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Chemical reactions are an integral part of technology, of culture, and indeed of life itself. Burning fuels, smelting iron, making glass and pottery, brewing beer, and making wine and cheese are among many examples of activities incorporating chemical reactions that have been known and used for thousands of years. Chemical reactions abound in the geology of Earth, in the atmosphere and oceans, and in a vast array of complicated processes that occur in all living systems.
Explanation:
hope it help
plss brainlys me
Answer:
Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products
Explanation:
Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
14. What are the two
main branches of science?
Answers
Answer:
Physical science
Life science
Explanation:
After obtaining vital signs, which prescribed medication should the nurse hold when caring for a client on the cardiac unit?ExhibitYou answered this question Correctly1. Rosuvastatin2. Enalapril3. Digoxin4. Clopidogrel T - 98 ° (36.7°)P - 74R - 20BP - 88/50
Answers
Based on the vital signs provided, the nurse should hold Digoxin when caring for the client on the cardiac unit.
Digoxin is a medication commonly prescribed to treat heart conditions, such as atrial fibrillation and heart failure. However, it can cause adverse effects on the heart and other organs if the dose is not carefully monitored, especially if the client's vital signs are not within a certain range. In this case, the client's blood pressure is lower than the normal range, which can indicate hypotension. Digoxin can further lower blood pressure and cause adverse cardiac effects in clients with low blood pressure. Therefore, the nurse should hold the medication and contact the healthcare provider to adjust the dosage or withhold the medication until the client's blood pressure stabilizes.
It is crucial for nurses to monitor their client's vital signs before administering medications, especially for clients on the cardiac unit. Vital signs, such as blood pressure, heart rate, and temperature, provide valuable information about the client's health status and can help identify potential adverse effects of medication. In this scenario, the nurse correctly identified that the client's low blood pressure warrants holding Digoxin. By doing so, the nurse can prevent adverse events and promote the client's safety and well-being.
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Which of the following units are commonly used in chemistry? A Kelvin b ampere c fluid ounce d kilogram
Answers
Explanation:
your answer is Kelvin because it is the SI unit of temperature
Question
Which two of these options does the transfer of light energy require?
A. Magnetic fields
B.Electric fields
C. Gravitational forces
D. Geometric figures
Answers
Answer: A,B
Explanation:
Answer: A. Magnetic fields
B. Electric fields
Explanation:
Which structure represents nonane?
ОА.
Н
---
H-C-H
т
Н
ОВ.
H H
1 т
н-с-с-Н
1
Н Н
Ос.
Н
H
H H
т
H-C— С
1
H H
H
І
СЕН
1
Н
Н
Н
OD.
Н
1
Н
Н
H
T
Н
Н Н H
І т
H-C— С—
т
Н H Н
І
С
1
Н
1
H
І
Н
Н
С— г-н
1
Н H
Reset
Next
Answers
Explanation:
i don't understand what you wrote, but nonane is C9H20
Which organelle is most directly related to cell division?
Answers
Answer:
centrioles
Explanation:
i learned this a few yrs back. hope it helps! :)
what is the angle between one of the carbon-hydrogen bonds and one of the carbon-chlorine bonds in the methylene chloride ( ) molecule?
Answers
The angle between one of the carbon-hydrogen bonds and one of the carbon-chlorine bonds in the methylene chloride (CH2Cl2) molecule is approximately 109.5 degrees.
This angle is a result of the tetrahedral geometry of the carbon atom in the molecule, which has four electron pairs around it. Two of these electron pairs are involved in the carbon-hydrogen bonds, and the other two are involved in the carbon-chlorine bonds. The shape of the molecule is determined by the repulsion between these electron pairs, which results in a tetrahedral arrangement. The angle between any two bonds in a tetrahedral molecule is approximately 109.5 degrees. This geometry is important for understanding the properties and behavior of molecules, as it affects how they interact with other molecules and their reactivity in chemical reactions.
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