The volume of concentrated aqueous ammonia must be diluted to 1.00 l to make a solution that has a molarity of 1.85 m. concentrated nh3 (aq) is 15 m. report the volume of concentrated aqueous ammonia in milliliters is 123 mL
The number of moles of solute must always remain constant while diluting solutions, which is the most crucial thing to remember.
In other words, the amount of solute in the concentrated sample must be identical to the amount of solute in the diluted solution.
The concentration is the number of moles per unit volume. So
c=n/V
n=CV
n= 1.85x1
n=1.85
Now your task is to determine what volume of the concentrated solution would contain this many moles of ammonia.
Plugging the values, we get
V=1.85/15
V=0.123 L
Now for dilution calculations, we have
C1V1=C2V2
V1=C2/C1.V2
V1=1.85/15x1.00= 123 mL
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A given sample contains 2.0 g of hydrogen, 33.1 g of sulfur, and 75.01 g of oxygen. What is the total mass of the sample?
Answer: 110.11g
Explanation:
If this is the question then it is as simple as adding up the masses of the different elements.
How can you explain the fact that there are different "isotopes" of pennium?
Answer:
A mixture of pre- and post-1982 pennies will represent the naturally occurring mixture of two isotopes of an imaginary element
Explanation:
Since 1982, U.S. pennies have been produced with 97.6% zinc with a thin plating of copper. Since each metal has a different density, pre- and post-1982 pennies have different masses.Different isotopes of an element generally have the same physical and chemical properties because they have the same numbers of protons and electrons.
Which protozoan is a ciliate?
A. Paramecium
B. Giardia
C. Amoeba
D. Plasmodium
you are transferring a sample of gas from a hot area to a cooler area assuming that there is no change in pressure and that no gas is lost in the process, what do you expect to happen? g
The Volume of the gas will decrease when a sample of gas from a hot area to a cooler area assuming that there is no change in pressure and that no gas is lost in the process.
The equation of an ideal gas is mentioned below;
PV = nRT
Let us assume that there is no change in pressure and that no gas is lost in the process of gas transfer. So, we can write
Pressure = P = Constant
Number of moles = n = Constant
R = Gas Constant
So, we can write the relation between the temperature and volume of gas as
T ∝ V
We are transferring a sample of gas from a hot area to a cooler area i.e., Temperature is decreasing. So, the Volume of the gas will also decrease.
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3. In the metric unit nanometer, "nano" is the base unit.
a. TRUE
b. FALSE
Answer:
False
Explanation:
The base unit is "meter."
Nanometer is equal to one billionth of a meter.
on can be described using words, diagrams, numerical information, equations, and graphs. Using
words to describe the motion of objects involves an understanding of such concepts as position,
displacement, distance, rate, speed, velocity, and acceleration.
Vectors vs. Scalars
1. Most of the quantities used to describe motion can be categorized as either vectors or scalars. A
vector is a quantity that is fully described by both magnitude and direction. A scalar is a quantity that is
fully described by magnitude alone. Categorize the following quantities by placing them under one of
the two column headings.
displacement, distance, speed, velocity, acceleration
Scalars
2. A quantity that is ignorant of direction is referred to as a
a. scalar quantity b. vector quantity
3. A quantity that is conscious of direction is referred to as a
a. scalar quantity b. vector quantity
Vectors
Distance vs. Displacement
As an object moves, its location undergoes change. There are two quantities that are used to describe
the changing location. One quantity - distance - accumulates the amount of total change of location
over the course of a motion. Distance is the amount of ground that is covered. The second quantity -
displacement - only concerns itself with the initial and final position of the object. Displacement is
the overall change in position of the object from start to finish and does not concern itself with the
accumulation of distance traveled during the path from start to finish.
1
Distance and speed are scalars while displacement and velocity are vector quantities, scalars are not concerned with direction while vector are conscious with direction.
1. Distance and speed are scalars while displacement and acceleration are vector quantities.
2. The quantity that is ignorant of the direction is referred to as a scalars quantity.
3. A quantity that is conscious with direction is Vector quantity.
Distance vs Displacement,
The displacement is the shortest distance between the final and the initial position of the body while the distance is the actual distance covered by the body.
The displacement has direction from initial to final position, while distance has no direction.
The distance can never be zero while the displacement can be zero, negative or positive.
Negative displacement state that the direction of displacement of the body is in negative direction.
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Plant reproduction. Answer as much as possible, thanks!
Answer:
Plant Reproduction
When plants reproduce asexually, they use mitosis to produce offspring that are genetically identical to the parent plant. The advantage of asexual reproduction is that it allows successful organisms to reproduce quickly. ...
When plants reproduce sexually, they use meiosis to produce haploid cells that have half the genetic information of the parent (one of every chromosome)
Explanation:
HOPE IT HELPS YOU
preparation and characterization of a copper phosphotungstate/titanium dioxide (cu-h3pw12o40/tio2) composite and the photocatalytic oxidation of high-concentration ammonia nitrogen
Try this? I'm not sure if i understood the question correctly
A composite photocatalyst of copper phosphotungstate/titanium dioxide (Cu-H3PW12O40/TiO2) : prepared by sol-gel hydrothermal synthesis.The composite catalyst was characterized by X-ray diffraction (XRD), UV–vis-diffuse reflectance spectroscopy (UV-VIS-DRS), Fourier converted infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS)、scanning electron microscopy (SEM) and power dispersive X-ray spectroscopy (EDS). The photocatalytic oxidation of a high-concentration NH4+/NH3 occured under ultraviolet (UV)light. The composite catalyst exhibited higher photocatalytic activity than that of TiO2. When 300 mg·L−1, the initial pH was 11, the catalyst concentration was 1.5 g·L−1, the loading level of Cu-H3PW12O40 was 40%, the aeration rate was 1.5 L·min−1, and lastly the removal rateof NH4+/NH3 by the composite photocatalyst could reach >80%. Very little NO2− and NO3− were produced, and N2 was the main product.
Which two solutions would be the BEST choice for their experiment?
Solutions 1 and 3 because they are a strong acid and a strong base.
Solutions 1 and 4 because they are a strong acid and a weak acid.
Solutions 3 and 4 because they are a strong base and a weak acid.
Solutions 2 and 3 because they are a weak base and a strong base.
Solutions 1 and 3 because they are strong acids and a strong base. Option A.
Strong acids and strong bases are completely ionized in an aqueous solution. Weak acids and weak bases also ionize, but only partially and the reaction is reversible. So you know if an acid or base is strong or weak. A simple way to determine strength is to add the acid or base to water. A higher reactivity means a stronger acid or base.
One of the simplest tests to determine whether a solution is an acid or base is the litmus paper test. To do this, dip a special strip of paper so-called litmus paper into the solution and observe the color of the paper. Litmus paper turns red in acidic solutions and blue in basic solutions. Sodium hydroxide is the strongest base because it completely dissociates to form sodium and hydroxide ions. These hydroxide ions are further treated with hydrogen ions by an acid to completely ionize the hydrogen ions.
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The correct number of atoms of each element present in the formula (NH 4) is
STEP-BY-STEP EXPLANATION:
Given the below compound
10.0 trillion DNA molecules is equal to how many moles of DNA?
1.66 × 10–11 moles
6.02 × 1010 moles
6.02 × 1036 moles
1.66 × 1010 moles
10.0 trillion DNA molecules are equal to option a. 1.66 × 10–11 moles.
Deoxyribonucleic acid is a polymer composed of polynucleotide chains that coil around every different to shape a double helix sporting genetic instructions for the improvement, functioning, increase, and reproduction of all known organisms and many viruses. DNA and ribonucleic acid are nucleic acids.
DNA is fabricated from chemical constructing blocks known as nucleotides. those building blocks are the product of three components: a phosphate institution, a sugar institution, and one of four styles of nitrogen bases. To shape a strand of DNA, nucleotides are connected into chains, with the phosphate and sugar corporations alternating.
calculation:-
1 trillion = 10¹² DNA molecules
6.022 × 10²³ molecule = 1 mole
10¹² DNA molecules = 1 / 6.022 × 10²³ × 10¹²
= 1.66 × 10–11 moles
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How does adding deionized water into a solution containing ions affect the electrical conductivity of the solution?.
Adding deionized water into a solution containing ions will affect the electrical conductivity of the solution because the ions in the solution will be attracted to the water molecules.
Deionized water is water that has had its ions removed. This means that it will not conduct electricity.It will cause the ions to be more spread out in the solution, which will decrease the electrical conductivity of the solution. When deionized water is added to a solution containing ions, the electrical conductivity of the solution will be reduced. The reason for this is that the ions in the solution will be attracted to the water molecules, and this will reduce the number of ions that are available to conduct electricity.
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Which compound contains covalent bonds?
1. AlN
2. Ca3N2
3. NaCl
4. HCl
HCl compund contains covalent bond.
When 2 atoms exchange one or a lot of pairs of electrons, a covalent bond is formed.
A chemical bond is formed once the distinction between the leptonegativities of 2 atoms is just too tiny for associate electron transfer to occur and manufacture ions.
Let's determine which choice contains covalent bonding.
1. Al-N bonds exhibit some ionic properties in addition to being partially covalent. structure, 1.633, which is most likely influenced by the ionic properties of Al-N bonds [3].
2. Ca and N have electronegativities of 1.0 and 3.0, respectively. Therefore, the difference in electronegativity between Ca and N is (3.0-1.0) or 2.0. Thus, an ionic link exists between Ca and N. Ca3N2 C a 3 N 2 is hence an ionic compound.
3. Since covalent compounds are created by the exchange of electrons, NaCl is not a covalent compound; rather, it is an ionic compound.
4. Because the difference in electronegativity between hydrogen and chloride is less than 2.0, HCl is a covalent compound.
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calculate molar solubilities, concentrations of constituent ions, and solubilities in grams/liter for the following compounds at 25°c. i. barium phosphate (ksp
The solubility product, Ksp of barium phosphate is helpful to calculate the molar solubility and concentration of ions.
The equilibrium constant for a solid material dissolved in an aqueous solution is the solubility product constant, Ksp. It denotes the concentration at which a substance dissolves in solution. A material's Ksp value indicates how soluble it is - larger the Ksp value, the more soluble it is. Solubility equilibrium is a sort of dynamic equilibrium that occurs when a chemical substance in solid form is in chemical equilibrium with that compound's solution. The solid may dissolve unmodified, by dissociation, or through chemical reactivity with another solution element, such as acid or alkali. The solubility product is determined by the molar concentrations of the ions in saturated solutions, whereas the ionic product is determined by any solution.
Reaction:
[tex]Ba_3(PO_4)_2 \rightleftharpoons 3Ba^{2+} + 2PO_4^{3-}[/tex]
The solubility product of barium phosphate, Ksp = 1.3 x [tex]10^{-29}[/tex]
The expression of solubility product for barium phosphate is given as:
Ksp = [tex](3S)^3[/tex] x [tex](2S)^2[/tex] = 108 [tex]S^5[/tex]
1.3 x [tex]10^{-29}[/tex] x [tex](2S)^2[/tex] = 108 [tex]S^5[/tex]
[tex]S^5[/tex] = 1.3 x [tex]10^{-29}[/tex] / 108
S = 6.5479 x [tex]10^{-7}[/tex]M
Concentration of barium ions = [tex][Ba^{2+}][/tex] = 3 x 6.5479 x [tex]10^{-7}[/tex] = 1.9643 x [tex]10^{-6}[/tex]M
Concentration of phosphate ions = [tex][PO_4^{3-}][/tex] = 2 x 6.5479 x [tex]10^{-7}[/tex] = 1.3096 x [tex]10^{-6}[/tex]M
Molar solubility of [tex][Ba_3(PO_4)_2] \frac{[Ba^{2+}]}{3}[/tex] = 1/3 x 1.9643 x [tex]10^{-6}[/tex] = 6.5479 x [tex]10^{-7}[/tex]M
Solubility product of [tex]Ba_3(PO_4)_2[/tex] = 6.5479 x [tex]10^{-7}[/tex] x 601 = 0.0003935g/L
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What happens to Rutherfordium when it decomposes and loses two
neutrons?
Rutherfordium when decomposes and loses two neutrons, both these rutherfordium isotopes produce neutrons as they undergo their nuclear decay into nobelium.
Rutherfordium's reactivity with the halogens is unclear because so little of it has ever been produced. One would anticipate that it will behave similarly to zirconium and hafnium, which are just above rutherfordium in the periodic table (two places above). After the rutherfordium decays, the distinctive nobelium decay energy and half-life were also seen. Atoms have been created rather infrequently. It is solely employed at this time for research.
The biological function of rutherfordium is unknown. When Rutherfordium, the 104th element on the periodic table, was first artificially created in the 1960s, it sparked a decades-long international debate. The main point of contention was who should get to name the new element. Traditionally, the person who discovers an element is given the privilege of naming it, but this becomes complex when two parties have conflicting claims of discovery.
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If earth’s atmosphere was composed entirely of nitrogen and oxygen, would the globally averaged surface air temperature increase or decrease compared to our current globally averaged surface air temperature?.
The globally averaged surface air temperature would decrease if the atmosphere were composed entirely of nitrogen and oxygen. The main greenhouse gases in the atmosphere are water vapor, carbon dioxide, and methane.
These gases allow sunlight to pass through the atmosphere and then trap some of the heat that radiates back from the Earth's surface. Nitrogen and oxygen are not greenhouse gases, so they would not trap heat in the atmosphere.The global average surface air temperature would decrease because nitrogen and oxygen are both transparent to incoming solar radiation, meaning that less heat would be trapped at the surface of the Earth. Additionally, the greenhouse effect would be weaker without other greenhouse gases like water vapor and carbon dioxide, further cooling the planet.
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1. True or False: Measuring a chemical property is a nondestructive
process. It will not disturb the composition of your sample.
The answer to the statement " Measuring a chemical property is nondestructive " is true.
Why are chemical properties of substances nondestructive?The chemical properties of substances such as boiling point, melting point, pH, reactivity, combustion, density, flammability, toxicity, solubility or even oxidation states are different characteristics which one can test for in a substance and does not affect the substances themselves in the process.
That being said, when you test for measure a chemical such as from the any of the ones above, it means you want to see or identify or observe the chemical composition of the substance. This won't affect the substance.
For example, when measuring the pH of a substance, that is; measuring the degree of acidity or alkalinity of a substance, it does not affect the substance in the test but reveals to us more about the chemical level or composition of the substance in details.
So therefore, we can now confirm that testing or measuring the chemical features of a substance is harmless to the substance itself.
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heat capacity is a measure of the heat required to . group of answer choices raise the temperature of one gram of a substance by one degree celsius raise the temperature of one ounce of a substance by one degree fahrenheit bring a liquid to change phase raise the amount of heat a liquid will absorb before evaporating
Answer:
raise the temperature of one gram of a substance by one degree Celsius
Explanation:
Heat capacity is a physical property of matter, which is defined as the amount of heat to be supplied to something to produce a unit change in its temperature. Heat capacity is also called thermal capacity.
PLEASE HELP, AWARDING BRAINLIEST!
The wavelength in the nanometer is 9.70 E-22.
Wavelength is the distance among equal points (adjacent crests) inside the adjacent cycles of a waveform sign propagated in space or alongside a wire.
The wavelength is the distance between two wave crests, and it is going to be the same for troughs. The frequency is the number of vibrations that pass over a given spot in a single 2d, and it's far measured in cycles according to 2d Hz.
The wavelength of light determines its shade, and the wavelength of sound determines the pitch. The wavelengths of seen light amplify from approximately seven-hundred nm (purple) to 400 nm (violet). The wavelength of audible sound range from approximately 17 mm to 17 m.
E = hc/λ
wavelength (λ) = hc/E
= 6.626 × 10⁻³⁴ × 3 × 10⁸ / 2.05 × 10³ × 1000
= 9.696 × 10⁻³² meter
= 9.696 × 10⁻³² × 10⁹ nm
= 9.696 × 10⁻²² nm
= 9.70 E-22
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A student conducts an experiment to determine whether adding salt causes water to boil more quickly. The student plans to heat two pots of water and measure how long they take to boil. One pot has salt in it and the other does not. The pot of water with salt added is the experimental group. The pot of water without salt is the control group. For the boiling salt water experiment described, list three things that would make the control group ineffective.
Three things that would make the control group ineffective include the following below:
Salt being added.The water not being heated.Different amounts of water being put in the pots.What is a Control group?This is referred to as the group which is doesn't experience any experimental treatment by scientists and are used to compare another in this scenario.
The control group in other to be effective must have salt not being added which is compared to the others with salts to determine if it has any effect on the boiling point. The same volume of water should also be added to get an accurate result.
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Answer: Number 1, since the control group doesn't have salt, to make it ineffective is to add salt, another one is if you don't boil the control group. And lastly, if you don't add water to the pot. It's pretty simple if you think about it, and to verify it, I did it on apex and it worked.
So
1. Add Salt
2. Don't Boil
3. Don't Add Water
I hope this helps.
a scuba diver exhales 2.05 l of air while swimming at a depth of 98.70 m where the sum of atmospheric pressure and water pressure is 10.54 atm. by the time this exhaled air rises to the surface, where the pressure is 1.00 atm, what is its volume?
The final volume of the air assuming constant temperature is 21.607 Liters using Boyle's gas law.
What is the Boyle's gas law equation?The empirical relation states that under constant temperature, the pressure (p) of a given amount of gas changes inversely with its volume (v); that is, pv = k.
Given,
Initial volume = 2.05 Liters.
Height = 98.70 meters
Final pressure = 1.00 atm.
Initial pressure =10.54atm.
PV = k
P₁V₁=P₂V₂
Substituting the given parameters into the formula,
10.54 × 2.05 = 1 × V₂
V₂ = 21.607
Final volume = 21.607 Liters.
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divide the molar mass of the compound by the empirical formula mass. the result should be a whole number or very close to a whole number. multiply all the subscripts in the empirical formula by the whole number found in step 2. the result is the molecular formula.
The given statement is true. If we divide the molar mass of the compound by the empirical formula mass, the result should be a whole number or very close to a whole number. multiply all the subscripts in the empirical formula by the whole number found in step 2. the result is the molecular formula.
If we write the above statement in the equation or formula then we will get
[tex]\frac{Empirical formula mass}{ Molecular mass}[/tex] = n
Where 'n' is always a whole number
Now, let's understand the above statement with the help of an example.
If we take glucose, a monosaccharide sugar, having molecular formula C₆H₁₂O₆.
The molar mass of glucose is 300 g/mole. Its empirical formula mass is 180 g/mol.
Now by diving them, we will get a whole number
180 / 30 = 6 ( A whole number)
The empirical formula of glucose is CH₂O. If we multiply all the subscripts in the empirical formula (CH₂O) by 6, the result is the molecular formula i.e C₆H₁₂O₆.
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the diffusion coefficients for carbon in nickel are given at two temperatures: t (˚c) d (m2/s) 600 5.5 × 10-14 700 3.9 × 10-13 (a) determine the value of d0. enter your answer for part (a) in accordance to the question statement m2/s (use scientific notation.) (b) determine the value of qd. enter your answer for part (b) in accordance to the question statement kj/mol (c) what is the magnitude of d? at 830˚c. enter your answer for part (c) in accordance to the question statement m2/s (use scientific notation.)
Diffusion Coefficient at 600°C
D₁= 5.5*10⁻¹⁴ m²/s
Diffusion Coefficient at 700°C
D₂= 3.9*10⁻¹³ m²/s
D₁= D₀. exp(- Qd/ R.T₁)
D₂= D₀. exp (-Qd/ R.T₂)
We can solve first equation for D₀
D₀= D₁/ exp ( -Qd/ R.T₁)
Put D₀ in equation 2
D₂= D₁. Exp ( Qd/R. (1/T₁ - 1/T₂)
On rearranging the equation we can solve it for Qd:
Qd = R. ㏑( D₂/D₁) (T₁.T₂/ T₂-T₁)
= 8.314. ㏑( 3.9*10⁻¹³/ 5.5*10⁻¹⁴).( 873*973/100)
Qd = 138.3 KJ/mol
Now D₀= D₁/ exp ( -Qd/RT₁)
= 5.5*10⁻¹⁴/ exp (138300/8.314*873)
D₀= 1.04* 10⁻¹⁵ m²/s
For T= 830°C
D= 1.04* 10⁻⁵. exp ( 138300/8.314*1103)
D = 1.04* 10⁻⁵. exp ( 138300/9170.34) m²/s
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under certain conditions, the substance bromine trifluoride can be broken down to form bromine and fluorine. if 23.1 grams of bromine trifluoride react to form 13.5 grams of bromine, how many grams of fluorine must simultaneously be formed
Bromine Trifluoride is a colourless to grayish-yellow fuming liquid with a strong odour. It has a strong reaction to water. It is a fluorinating agent as well as an electrolytic solvent.
Bromine trifluoride was first described in 1906 by Paul Lebeau, who obtained it by reacting bromine with fluorine at 20 °C: Br 2 + 3 F 2 2 BrF. Bromine trifluoride is formed by disproportioning bromine monofluoride: 3 BrF BrF 3 + Br
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Bromine Trifluoride is a colourless to grayish-yellow fuming liquid with a strong odour. It has a strong reaction to water. It is a fluorinating agent as well as an electrolytic solvent.
Bromine trifluoride was first described in 1906 by Paul Lebeau, who obtained it by reacting bromine with fluorine at 20 °C: Br 2 + 3 F 2 2 BrF. Bromine trifluoride is formed by disproportioning bromine monofluoride: 3 BrF BrF 3 + Br
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pls help me with chemistry
just some questions
pls
Answer:
incomplete question need more information
5. Modern houses have systems to control internal air temperatures in times of very cold or hot weather. In these homes, hot or cool air is pumped into the interior of the house to help keep the temperature comfortable. Based on what you know about how cool and warm air circulate in the atmosphere, what might an engineer need to consider when designing a heating/cooling system for a home in a cooler climate?
How might the design differ for a house found in a warmer climate?
An engineer need to introduce heat pump systems when designing a heating/cooling system for a home in a cooler or warmer climate.
For all climates, heat pumps provide a more energy-efficient furnace and air conditioner replacement. Heat pumps, like your refrigerator, use power to move heat from a cold space to a warm space, warming the warm space and making the cool space cooler. Therefore, an engineer may introduce heat pump systems while designing a house in any kind of climate.
In the winter, heat pumps transfer heat from the chilly outside to your comfortable home. In the summer, heat pumps transfer heat from your home to the outside.
Heat pumps can effectively supply your home with acceptable temperatures since they transfer heat rather than producing it.
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Which of the following sets of quantum numbers are allowed and which are not allowed? For each incorrect set, select why it is incorrect.
(a) n = 3, ℓ = 3, mℓ = 0, ms = -½
For n = 3, ℓ = 3 is not possible
ms can never be a negative value
mℓ cannot equal -1
All of these quantum numbers are allowed
(b) n = 4, ℓ = 3, mℓ = 2, ms = -½
When n = 4, ℓ = 3 is not possible
ms can never be a negative value
mℓ cannot equal 2 when ℓ = 3
All of these quantum numbers are allowed
(c) n = 4, ℓ = 1, mℓ = 1, ms = +½
When ℓ = 1, mℓ = 1 is not possible
ms can not be positive
mℓ cannot equal 1 when n = 4
All of these quantum numbers are allowed
(d) n = 2, ℓ = 1, mℓ = -1, ms = -1
When n = 2, ℓ = 1 is not possible
ms can never be a negative value
ms cannot equal -1
All of these quantum numbers are allowed
(e) n = 5, ℓ = -4, mℓ = 2, ms = +½
mℓ cannot equal 2
ℓ cannot be a negative number
n has a maximum of four
All of these quantum numbers are allowed
(f) n = 3, ℓ = 1, mℓ = 2, ms = -½
When ℓ = 1, mℓ = 2 is not possible
ms can never be a negative value
ℓ cannot be 1 when n = 3
All of these quantum numbers are allowed
Provided all set of given quantum numbers are allowed.
(a) n = 3, ℓ = 3, mℓ = 0, ms = -½
For n = 3, ℓ = 3 is not possible
ms can never be a negative value
mℓ cannot equal -1
All of these quantum numbers are allowed
(b) n = 4, ℓ = 3, mℓ = 2, ms = -½
When n = 4, ℓ = 3 is not possible
ms can never be a negative value
mℓ cannot equal 2 when ℓ = 3
All of these quantum numbers are allowed
(c) n = 4, ℓ = 1, mℓ = 1, ms = +½
When ℓ = 1, mℓ = 1 is not possible
ms can not be positive
mℓ cannot equal 1 when n = 4
All of these quantum numbers are allowed
(d) n = 2, ℓ = 1, mℓ = -1, ms = -1
When n = 2, ℓ = 1 is not possible
ms can never be a negative value
ms cannot equal -1
All of these quantum numbers are allowed
(e) n = 5, ℓ = -4, mℓ = 2, ms = +½
mℓ cannot equal 2
ℓ cannot be a negative number
n has a maximum of four
All of these quantum numbers are allowed
(f) n = 3, ℓ = 1, mℓ = 2, ms = -½
When ℓ = 1, mℓ = 2 is not possible
ms can never be a negative value
ℓ cannot be 1 when n = 3
All of these quantum numbers are allowed
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An 8. 6 mol sample of NO2 is in a 5. 1 L container. What is the pressure of this gas in atmospheres at 33 K? R= 0. 08206 L•atm / (mol•K)
8.6 mole sample of NO₂ in a 5. 1 L container has 4.6 atmospheric pressure at 33 K.
Given, number of moles of No₂(n) = 8.6 mole
Volume (V) = 5.1 liters
Temperature (T) = 33K
R= 0. 08206 L•atm / (mol•K)
Using ideal gas equation ,
PV=nRT
P (5.1L) = (8.6mol) (0.08206L•atm/(mol•K)) (33K)
P (5.1) = 8.6 × 0.08206 × 33
P (5.1) = 23.3
P = 23.3 ÷ 5.1
P = 4.6 atm
Hence, the pressure of the given gas is 4.6 atmosphere (atm).
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A chemist sets up an experiment as follows: she puts bromine gas in a flask that is attached to an airless chamber. Describe what the chemist will observe when she opens the tap connecting the chamber to the flask. Explain your answer.
If the bromine gas in flask is attached to an airless chamber it liquefies and when the tap opens the bromine liquid comes outside.
What is bromine?Bromine is an element in 17th group of periodic table and it is a halogen exists in gaseous state.
When we apply sufficient pressure to a gas in a container the gas molecules starts condensing and then forms changes to its liquid state.
Therefore, in the airless flask where the pressure is higher the bromine gas starts to liquify and thus the tap pour the bromine liquid.
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A scientist has a “mystery element” that she wants to identify by using its properties. These properties include its freezing point. She collected data about the element’s freezing point and displayed it on this graph.
The line shows a decreasing slope from 1650 C until a little below 1500 C from time 1 to 15 minutes. At a little below 1500 C, the line flattens until 25 minutes. After 1500 C, the slope decreases until 35 minutes.
Examine the graph. Explain what physical states are represented by each graph region, and describe how the behavior of the particles changes over time.
The physical states represented by each graph region are;
between 1650 C until a little below 1500 C is solid statebelow 1500°C is liquid stateAs time proceeds, the particles become less mobile and more ordered in structure.
What is a change of state?A change of state refers to the processes by which matter changes from one physical state to another.
A change of state of matter occurs when heat is added or removed from a substance.
The stages of matter are:
solidliquid, andgasThe processes of change of state include;
freezing - when a liquid changes to solidmelting - when a solid changes to liquidevaporation - when a liquid changes to gascondensation - when a gas changes to liquidFor pure substances, a change of state occurs at a definite temperature.
This property is used to determine the purity of substances.
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