Diffusion of Ammonia in an Aqueous Solution. An ammonia (A)-water (B) solution at 278 K and 4.0 mm thick is in contact at one surface with an organic liquid at this interface. The concentration of ammonia in the organic phase is held constant and is such that the equilibrium concentration of ammonia in the water at this surface is 2.0 wt 'Yo ammonia (density of aqueous solution is 991.7 kg/m3) and the concentration of ammonia in water at the other end of the film 4.0 mm away is 10 wt % (density of 961.7 kg/m3). Water and the organic are insoluble in each other. The diffusion coefficient ofNH3 in water is 1.24 x 10- 9 m 2/sCalculate the flux N_B. Explain.
Answer:
The Flux N_B = 0
Explanation:
So, we are given the following set of data or parameters which is going to help in solving this particular Question. So, let us take each at a time;
=> "An ammonia (A)-water (B) solution at 278 K and 4.0 mm thick is in contact at one surface with an organic liquid at this interface."
=>" 2.0 wt 'Yo ammonia (density of aqueous solution is 991.7 kg/m3) and the concentration of ammonia in water at the other end of the film 4.0 mm away is 10 wt % (density of 961.7 kg/m3). ''
With the information above, we can determine the N_A(which the question did not specify that we should calculate).
For the value of N_B, it will be equals to zero(0) because the insolubility of water in organic solvent.
4
The element bromine at room temperature is a liquid with a density of 3.12 g/nl.
Calculate the mass (wanted measurement) of 125 mL (given measurement) of bromine.
(use the given density as the conversion factor to calculate the wanted measurement).
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Which postulate of the kinetic-molecular theory applies to the particles of a liquid?
They do not move freely but vibrate in a stationary position.
They can be compressed, which causes a large change in volume.
They have so much kinetic energy that their intermolecular forces are negligible.
They have enough kinetic energy to easily slide by each other.
The particles of liquid have enough kinetic energy to easily slide by each other. The correct option is D.
What is kinetic-molecular theory?The kinetic-molecular hypothesis stated matter states and is based on the assumption that matter is made up of tiny particulate that are constantly in motion.
This theory adds to the knowledge of observable properties and behaviors of solids, liquids, and gases.
Because they are densely packed and vibrate in place, solids have the lowest kinetic energy.
Since liquids have higher kinetic energy, the particles slide past each other. Because gases have the most kinetic energy, they float around in the air.
Particles in liquids are very close together and move randomly throughout the container.
Due to the shorter distances between particles, particles move rapidly in all orientations but strike with each other more frequently than in gases.
Thus, the correct option is D.
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What is the length of one mole of the typical cell phone that is approximately 15 cm in length?
i dont know how to remove my answer so ignore this
Answer:
Some objects of more than 15 cm and less than 30 cm can be:
A rule.
A cell phone.
A pencil.
A calculator.
A laptop charger.
We have to measure it helps us to compare and to obtain physical magnitudes of different objects.
Measurement is the action of obtaining a representative magnitude of a particular object, now, to measure we need to compare and have reference points.
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Explanation:'
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According to the rules covered in this class, which of the following ionic compounds is named incorrectly?
cobalt(II) oxide
nickel(II) sulfide
copper(II) selenide
zinc(II) telluride
All of these names are correct.
Answer: is copper(ll)selenide
Explanation:
is copper (ll)selenide
i hope this help
oxidation is a example of ?the answer choices are are here
A.a financial property,B.a chemical property,C.cool science stuff,D.a physical property
Answer:
B. a chemical property
Explanation:
Oxidation requires a chemical reaction to occur, therefore it is a chemical property.
A gas of 3.4 moles occupies of a volume of 25 Liters. How many moles will occupy 50 Liters?
Answer:
n₂ = 6.8 mol
Explanation:
Given data:
Initial number of moles = 3.4 mol
Initial volume = 25 L
Number of moles = ?
Final volume = 50 L
Solution:
According to Avogadro law,
V₁/n₁ = V₂/n₂
Now we will put the values in formula.
25 L/3.4 mol = 50 L/ n₂
n₂ = 50 L× 3.4 mol/25 L
n₂ = 170 L.mol/25 L
n₂ = 6.8 mol
there about 5000 elements, which combine to form the vast number of diffrent substances in the world around us
Answer: false 100
Explanation:
if this is the true or false test here
14. How do you describe an atom in which the number of protons is equal
to the number of electrons?
Which of the following statements best describes how the compound sodium chloride is formed?
Select one:
a. Sodium transfers one electron to chlorine, forming a sodium ion with a positive one charge and a chloride ion with a negative one charge.
b. Sodium takes one electron from chlorine, forming a sodium ion with a negative one charge and a chloride ion with a positive one charge.
c. Sodium and chlorine share protons.
d. Sodium shares one electron with chlorine.
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Actually Welcome to the Concept of the Ionic Compounds
since the compound NaCl is a ionic compound, both should have ionic charges, hence they are shown as
Na+ Cl-
The correct option is a.)
a.) Sodium transfers one electron to chlorine, forming a sodium ion with a positive one charge and a chloride ion with a negative one charge.
The correct answer is sodium transfers one electron to chlorine, forming a sodium ion with a positive one charge and a chloride ion with a negative one charge.
How sodium chloride is formed?Sodium chloride is a chemical made up of sodium and chloride ionic bonds. When sodium atoms interact with chlorine atoms, sodium chloride is generated. Chlorine will get an electron (a negatively charged particle) from sodium. As a result, sodium becomes slightly positive and chlorine becomes slightly negative. Sodium is reduced in this process because it provides an electron, while chlorine gains an electron and is oxidized.Learn more about ionic compounds here:
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How could you measure the average kinetic energy of a group of particles
Answer:
Temperature measures the average kinetic energy of the particles in a substance. Thermal energy measures the total kinetic energy of the particles in a substance. The greater the motion of particles, the higher a substance's temperature and thermal energy.
Explanation:
The image represents a(n)
A) ion of xenon.
B) atom of xenon.
C) molecule of xenon.
D) compound containing xenon.
Answer:
B) atom of Xenon
Explanation:
Xenon is already stable alone, because it has a complete octet, or 8 electrons. This graph is not an ion because it shows xenon is its default state, consisting of 8 electrons.
It is not a molecule because a molecule is a group of atoms, or a compound, what is shown is a singular atom.
engineers create a new metal that i stronger than steel but much lighter
Answer:
Yes. True
Explanation:
Yes, this is true that engineers can make a lighter, cheaper, stronger material. Currently this metal is used for aircraft, and is easy to manufacture.
Select the molecular shape of each molecule based on the formula or Lewis structure.
Answer:
1. linear (A)
2. trigonal-planar (C)
3. tetrahedral (B)
4. linear (A)
Explanation:
Just did it on Edge 2020
The shape of a molecule can be predicted from the number of electron pairs that surround the central atom in the molecule.
The Valence Shell Electron Pair repulsion theory gives us a basis for predicting the shape of molecules. The shape of a molecule can be predicted from the number of electron pairs that surround the central atom in the molecule.
In the image shown, We can see that in HCN , carbon is the central atom and is surrounded by two atoms and no lone pairs. Since there are two electron domains around the central atom, the molecule is linear.
In the second structure, BH3 has boron as its central atom. Three electron domains surround the central atom hence the molecule is trigonal planar.
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Matter is anything that takes up space and can be described by physical and chemical properties. Which statement
BEST differentiates chemical properties from physical properties?
A)
Physical properties are properties that can be physically seen or touched,
while chemical properties can only be found when matter is mixed with
specific chemicals.
B)
Physical properties are measured when matter changes its physical state,
while chemical properties can only be measured if matter remains in one
state for an extended time.
C)
Physical properties are difficult to measure because they require special
tools to detect, and chemical properties are easy to measure and require
not special tools to detect.
D)
Physical properties can be measured/observed without changing matter
into something else, while chemical properties describe matter's ability to
react/combine with other matter.
Answer:
D)
Physical properties can be measured/observed without changing matter
into something else, while chemical properties describe matter's ability to
react/combine with other matter.
Explanation:
Physical Change
The changes that occur only due to change in shape or physical properties but their chemical or internal composition remain unchanged.
1 = These changes were reversible.
2= They have same chemical property.
3= These changes can be observed with naked eye.
Example :
Water converting to Ice
Water converting to gas
In this water molecule remain the same only they rearrange themselves that change its state of mater not composition
Chemical change:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
1 = These changes are irreversible
2 = These changes occur due to chemical reactions
3 = These may not be observed with naked eye
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO₂ and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg .
The reaction of Hydrogen and oxygen:
H₂ (g) + O₂ (g) → 2H₂O (l)
what is the covalent bond for Hydrogen + Chlorine (HCI)
Answer:
HCl, also known as hydrochloric acid, has a covalent bond. The hydrogen (H) atom shares an electron with the chlorine (Cl) to form the bond.
Explanation:
Consequently, the bonding electrons in hydrogen chloride are shared unequally in a polar covalent bond. The molecule is represented by the conventional Lewis structure, even though the shared electron pair is associated to a larger extent with chlorine than with hydrogen.
The relationship between a carnivore and an herbivore can be started as
Answer:
Herbivores
Explanation Herbivores are the animals that rely on plants for their nutrition or food. Carnivore are the animals that prey upon herbivore to survive.
The research and design team of a car manufacturing company is developing a new safety product that automatically
tests a car's brakes. When the team discusses how exactly they plan to determine whether the new technology is
successful or not, what stage of technological design are they in?
O first
O second
third
O fourth
The team should discuss the plan to determine whether the new technology is successful or not in the fourth stage. The correct option is D.
What are different stages of technology testing?When a company manufactures any item, he test it before sending it to the market. This is called technology testing. The test goes from four stages. Here, the item is car's break.
Thus, the correct option is D, fourth stage.
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84. Predict how many electrons each element will most likely
gain or lose.
(a) I
(b) Ba
(c) Cs
(d) Se
Answer:
I will gain 1 electron
Ba will lose 2 electrons
Cs will lose 1 electron
Se will lose 2 electrons
Explanation:
What compound/element is this?
(Easy)
Answer:
C₃H₆ propene
Explanation:
Find the chemical formula by adding all the carbon and then all the hydrogen together.
Use the following Information to answer question 10.
DDT is a pesticide that farmers used to spray on their crops to ward off insects.
Unfortunately, once DDT is released into the environment, it does not break
down. Because of this, DDT can spread as shown in the example below,
Crop
Insect
Bird->
Falcon
10. In this example, as the DDT passes along up the food chain, the concentration of
DDT would:
a gradually decrease
b. gradually increase
c. remain the same
d. decrease then increase
Answer:
c. remain the same
Explanation:
Since DDT is persistent and does not break down when release into the environment, it is expected that its concentration as passes along the food chain will likewise persist.
If a substance is non-biodegradable, when it enters the body system or any living tissue, it passes on as waste. Such matter is not broken down or transformed into another type. Over many years, it will remain as it is. We can picture this problem by using non-biodegradable plastics. They remains just the same in the environment.I've asked before and gotten spammed hopefully I won't get spammed this time please help me with this someone. pls help anyonw
Answer:
See below!
Explanation:
A. The picture of the graph is attached. You can tell the amount of protons in an element by looking at the periodic table. The elements are ordered by the number of protons in an element.
B. Carbon and silicon are at the peaks of the chart. The peak is the highest point in a graph.
C. The elements belong to the non-metal group.
D. The halogens are non-metals, and their vapors are colorless.
The halogens are toxic to humans.
Halogen molecules are made of two atoms; they are diatomic.
Halogens react with non-metals to form crystalline compounds that are salts.
The halogens get less reactive going down the group on the periodic table.
Halogens can bleach vegetable dyes and kill bacteria.
E. The picture of the table is attached. To figure which numbers to put where, you need to pay attention to the other numbers. The halogens follow a trend with each of these properties. You have to put in the numbers that fit in among the other numbers.
A 475 cm3 sample of gas at standard temperature (273 K) and pressure
(1 atm) is allowed to expand until it occupies a volume of 600. cm3. What
temperature would be needed to return the gas to standard pressure (1 atm)?
(n = constant
Answer:
T₂ = 344.8 K
Explanation:
Given data:
Initial volume of gas = 475 cm³
Initial temperature = 273 K
Final volume = 600 cm³
Final temperature = ?
Solution:
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
T₂ = T₁V₂/V₁
T₂ = 273 K × 600 cm³ / 475 cm³
T₂ = 163800K . cm³ / 475 cm³
T₂ = 344.8 K
How many significant figures does this measurement contain? 0.0000508800 Gm
Answer:
There are 6 significant figures
Answer:
6 significant figures
Explanation:
When counting significant figures, start on the left with the first non-zero number. Count all numbers that fall between non-zero numbers. Count all zeros after a 1-9 and after the decimal.
Sunlight shining through a clear window it’s Jeremy’s face while he does his homework he uses a large wooden wooden block to cover the window what do the wooden block in the clear window demonstrate
Which of the following molecules has a trigonal planar shape?
Answer:
BF 3
Explanation:
The geometry of the BF 3 molecule is called trigonal planar The fluorine atoms are positioned at the vertices of an equilateral triangle. The F-B-F angle is 120° and all four atoms lie in the same plane.
Answer:
BF3
Explanation:
A p ex
All surfaces have texture, which means it affects how things move over it. When it takes a long time for friction to slow down an object, what is most likely true about the surface the object is moving on? The surface is dry. The surface is rough. The surface is uneven. The surface is smooth.
The question is incomplete, the complete question is;
All surfaces have texture, which means it affects how things move over it. When it takes a long time for friction to slow down and object, what is MOST LIKELY true about the surface the object is moving on? (A) The surface is dry (B) The surface is rough (C) The surface is uneven (D) The surface is smooth
Answer:
(D) The surface is smooth
Explanation:
Friction exists because of relative motion between two surfaces in contact with each other. However the magnitude of friction depends on how rough or smooth the surface is.
For smooth surfaces, there is little or no resistance to motion as objects move over the surface. Hence objects take a longer time to slow down on a smooth surface due to very little friction.
On a rough surface, objects tend to slow down relatively quickly. Hence, less resistance to motion on a smooth surface makes an object to take a longer time to slow down on a smooth surface than on a rough surface.
Answer: D
Explanation: Because if the surface is smooth it causes it to be more even for it to be able to cause Friction
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What information does not need to be included a chemical waste label? Select one: Relative amounts of chemical compounds in the container. The date the waste container was filled completely. A description of the experiment the chemicals were used for. Names of the chemical compounds present in the container.
Answer:
A description of the experiment the chemicals were used for.
Explanation:
A chemical waste label is required to provide information about any hazardous waste present in the container. Some details are mandatory to mention of the chemical waste label to prevent any accident while doing the experiment, that includes:
Chemical compound's name present in the container.Composition and physical state of the waste.Hazardous properties of the waste.The date of manufacturing.Amount of chemical compounds filled in the container.A chemical waste label does not mention or describe the experiment for which the chemicals were used for, scientists, teacher or students should have knowledge of the chemical composition by reading their names and evaluate themselves on which chemical should be used for which experiment.
Hence, the correct answer is "A description of the experiment the chemicals were used for."
The correct answer is A description of the experiment the chemicals were used for.
A chemical waste label must contain all the information about any hazardous waste present in the container. It should clearly indicate the composition of the waste, the date of manufacturing and the amount of chemical compounds filled in the container. A chemical waste label does not need to mention the experiment for which the chemicals were used.
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Write the principle of separation of mixture.
Explanation:
Mixtures can be separated using a variety of techniques. Chromatography involves solvent separation on a solid medium. Distillation takes advantage of differences in boiling points. Evaporation removes a liquid from a solution to leave a solid material.
Which three types of electromagnetic waves have longer wavelengths than the waves that make up visible light ?
O radio waves, gamma rays, X-rays
O gamma rays, infrared light, X-rays
microwaves, radio waves, infrared light
O infrared light, ultraviolet light, microwaves
Answer:
C
microwaves, radio waves, infrared light
Explanation:
Three types of electromagnetic waves that have longer wavelengths than the waves that make up visible light are microwaves, radio waves, and infrared light.
Electromagnetic waves
Electromagnetic waves are type of waves that do not require material medium for their propagation.
The frequency of the wave decrease with increase in the wavelength of the wave.
Also, the wavelength of the wave decreases with increase in the frequency of the wave.
Examples of electromagnetic spectrum arranged in increasing wavelength
Gamma rayX rayUltra violet rayVisible lightinfraredmicrowaveRadio wavesThus, three types of electromagnetic waves that have longer wavelengths than the waves that make up visible light are microwaves, radio waves, and infrared light.
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