1.5 atm pressure will be required for neon at 30°C to have the same density as nitrogen at 20°C and 1.0 atm.
What is the theory of the ideal gas law?The relationship between a gas's pressure P, volume V, and temperature T in the range of low pressures and high temperatures, when the gas's molecules move virtually independently of one another, is known as the ideal gas law, also known as the perfect gas law.
Briefing:T[tex]_N_e[/tex] =30⁰C=(30+273)K=303K
T[tex]_N_2[/tex] =20⁰C=(20+273)K=293K
P[tex]_N_2[/tex] =1.0atm
Ideal gas constant - R=0.0821L⋅atm/ K⋅ mol
The molar mass of
Neon - M[tex]_N_e[/tex]=20.18g/mol
Nitrogen - M[tex]_N_2[/tex] =2⋅14.007g/mol=28.014g/mol
Determine the pressure P[tex]_N_e[/tex] required for neon at 30⁰C to have the same density (d) as nitrogen at 20⁰C.
d = m/V
We know that
n = m/M
Using the ideal gas law, we get
PV = nRT
PV = m/M *RT
Since
PM/RT = m/V =d
d = PM/RT
d= [tex]\frac{P_{N_2} M_{N_2}}{R T_{N_2}}[/tex]
d = 1.0 atm * 28.014 g/mol/0.0821L atm/K mol 293K
d = 1.2 g//L
Since both gases have the same density, we can calculate the pressure of neon gas, using
[tex]d=\frac{P_{N e} M_{N e}}{R T_{N e}}[/tex]
[tex]P_{N e}=\frac{d R T_{N e}}{M_{N e}}[/tex]
[tex]P_{N e}[/tex]=1.2g/L . 0.0821L . atm/K.mol.303 K/20.18 g/mol
[tex]P_{N e}[/tex]=1.5 atm
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Determine the energy of a photon whose frequency is 5.94x10^17Hz. Answer in units of J
Answer:
[tex] \huge{ 3.935 \times {10}^{ - 16} J}[/tex]
Explanation:
The energy of the photon can be found by using the formula
E = hf
where
E is the energy
f is the frequency
h is the Planck's constant which is
6.626 × 10-³⁴ Js
From the question the frequency is
5.94x10^17Hz
We have
[tex]E = 6.626 \times {10}^{ - 34} \times 5.94 \times {10}^{17} \\ = 3.935 \times {10}^{ - 16} J[/tex]
Hope this helps you
a gas has an initial volume of 8.50l. what is the final volume if 355j of work is done on the gas by a constant external pressure of 1.00atm? round the answer to three significant figures.
The pressure - volume work can be determined using the change in volume ΔV and a constant pressure P. Here, the final volume for the work done of 355 J at a pressure of 1 atm is 346 l.
What is pressure -volume work done?Work done on system or by a system can be thermodynamically determined using the equations connecting the variables temperature, T pressure p and volume V.
A pressure-volume work done is the expansion or compression of a gas at constant pressure and this can be mathematically written as:
W = - P ΔV.
= -P (V2 - V1)
It is given that the initial volume V1 = 8.50 L at a pressure of 1 atm and the work done for the expansion to volume V2 is 655 J. Thus, the final volume V2 is calculated as follows:
- 355 J = 1 atm ( V2 - 8.50 L)
V2 = -355 + 8.50 L
= 346.5 L.
Here, the volume is increased highly from the initial volume so this expansion and is work done by the system. Therefore, the final volume of the system is 346 liters.
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what is true of atoms, elements, and minerals? multiple select question. when a mineral is separated into its component atom parts, it is still a mineral. an element is a type of atom that has a specific number of protons. if a single atom of an element is broken apart, its pieces are still recognizable as that element. an atom is the smallest unit of an element that retains the characteristics of that element. minerals are composed of chemically bonded elements.
Correct statements are:
An element is a type of atom that has a specific number of protons.
An atom is the smallest unit of an element that retains the characteristics of that element.
Minerals are composed of chemically bonded elements.
When a mineral is separated into its component atom parts, those parts will act according to the element they belong to, and the elements have properties that differ from the original mineral, because of chemical bonds formed during the creation of the mineral.
If a single atom of an element is broken apart, its pieces are protons, neutrons, and electrons, particles that are universal for all elements, and there is no way to distinguish, for example, iron neutrons from hydrogen neutrons. In cases of radioactive decay, atoms of elements may break down to form new elements.
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The ground pigment in which painting material combines with a linseed oil vehicle and turpentine medium?.
Fresco is the ground pigment in which painting material combines with a linseed oil vehicle and turpentine medium.
Fresco is a type of ancient painting where color is applied to a wet lime plaster surface while being suspended in alkaline limewater. Fresco is not to be confused with a patina layer that is put on dried plaster or limewash. They are known as Secco applications. Fresco must be applied while the plaster is still damp and is only intended for use on pure lime plaster.
It cannot be applied to plaster that has dried, cement, lime with cement, or lime stucco (also referred to as lime stucco). The coloured limewater will carbonate with the wet plaster throughout the curing process after being applied to it, becoming a permanent part of the lime plaster surface. Fresco as a painting material can be utilized inside or outside.
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Decomposers in the rainforest ___________ break down materials.
A:A. slowly
B:B. do not
C:C. quickly
D:D. rarely
Answer:
Quickly
Explanation:
20 points for answer: D=m/v. Mass=30g and Volume=6mL
Answer:
density = 5 g/ml
Explanation:
D=m/v. Mass=30g and Volume=6mL
SO solve for D when m = 30 and v = 6
D=m/v
D = 30/6
density = 5 g/ml
Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of?.
Beryllium exists in Group 2 (Column 2) with the atomic number 4.
The atomic number of the next element in the group would be right below it, Magnesium (Mg). Magnesium contains the atomic number 12.
What is meant by atomic number?The charge number of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number. This is the number of protons present in the nucleus of each atom of that element, or the proton number, for conventional nuclei. Ordinary chemical elements can be uniquely identified by their atomic number.
The number of protons in an atom determines its atomic number, and isotopes have the same atomic number but different numbers of neutrons.
Beryllium exists in Group 2 (Column 2) with the atomic number 4.
The atomic number of the next element in the group would be right below it, Magnesium (Mg). Magnesium contains the atomic number 12.
The atomic number is the small number on the top left corner of the square of the element.
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What term describes the difference of the protons and electrons in an element?
Electrons and proton are a type of subatomic particle with a negative and positive charge. Protons are held together in the atom's nucleus by the nuclear force. A subatomic particle without charge is the neutron.
What are electrons give example?The electron, the smallest constituent part of an atom, has a negative charge. Protons and electrons are present in an atom in a neutral state in an equal number. One electron and one proton are all that the hydrogen ion has. On the other hand, the atomic nucleus possesses 92 protons, that means 92 electrons.
Where are electrons found?Electrons are present outside of the atom's nucleus, in contrast to neutrons and protons that are contained inside the nucleus at its center. Negative electrons are drawn to the positively charged nucleus so because electric charges of opposite sign attract one another.
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what type of reaction is 2 C5H5 + Fe --> Fe(C5H5)2
Answer:
Combination or Synthesis
Explanation:
It is a combination because 2 reactants are combining together to form the product.
What element is this? I am a yellowish gas with seven valence electrons that can kill. I am often used in disinfectants but never makes me with ammonia or you will get some nasty gases that can harm you.
The element that forms a yellowish gas, often used as a disinfectant, and forms a nasty gas with ammonia would be chlorine.
Properties of chlorineChlorine is an element with a valence electron of 7. It forms a greenish-yellow gas that is 2 to 5 times denser than air. The element belongs to a group of elements on the periodic table known as halogen.
Chlorine is used as a disinfectant. It is utilized in the treatment of water for domestic use. It has the ability to kill harmful microbes off surfaces. It is also used in the manufacturing of textile products, paper bleaching, and several other industrial uses.
Chemically, chlorine is highly reactive. It reacts with ammonia to form a toxic gas known as chloramine. The gas affects the throat, lungs, and eyes of humans and in high doses, can cause outright death.
Thus, the element in question that form yellowish gas, is used as a disinfectant, and forms nasty gas with ammonia would be chlorine.
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You are asked to separate sand and sodium chloride name the methods needed to carry out the procedure. Explain how you would carry out the procedure to obtain pure sand and sodium chloride back.
Method: Filtration
Sodium chloride is your everyday common table salt! So it's just separating salt fro. Water!
Procedure: The mixture of salt and sand can be separated by filtration followed by an evaporation process. Filtration can separate sand from a combination of sand and salt solution (salt dissolved in water). Sand stays on the filter paper as a residue after filtering. By boiling the filtrate, common salt may now be produced. Boiling causes all of the water to evaporate, leaving just salt remaining. This is known as evaporation. Thus, this is how salt and sand are separated.
to ensure that the decolorization of crystal violet reaction takes place within the linear range of the crystal violet calibration curve, and that there is an excess of hydroxide ions, 10.0 ml of the stock solution of crystal violet is diluted twice. first, with 10.0e so ml of distilled water and then with 10.0 ml of 0.10 m naoh. what is the [oh-] in the final dilute solution?
A calibration curve is a regression model that uses the instrument's reaction to known standards to forecast the unknown concentrations of interest-related analytes.
How do you calculate calibration curve?
The formula will have the general form of y = mx + b, where m denotes the slope and b the y-intercept, as in y = 1.05x + 0.2.When making adjustments to measurements made on samples whose values are unknown, use the equation for the calibration curve.Solve for y (the "true" value) by substituting the measured value (x) into the equation. We have four milliliters of a 2.5 x 10–5 molar solution of crystal violet.the crystal violet kinetics process, too.Usually, adding sodium hydroxide in much larger amounts causes the violet color to fade.You must now add the two of them together to complete this reaction.However, we're attempting to determine the crystal violet concentration prior to the reaction.Therefore, we are not attempting any story geometry; rather, we are attempting to determine the concentration of crystal violet at the start of the reaction.And it's not the crystal violet's concentration.We have four milliliters of a crystal violet solution that is 2.5 x 10 n-5 molar in size.When doing a crystal violet kinetics reaction.The violet tint typically vanishes as you add sodium hydroxide in much bigger amounts.Currently, you need to add the two together in this particular reaction.However, we're looking for the crystal violet concentration just before the reaction starts.We are only attempting to determine the concentration of the crystal violet at the start of the reaction; we are not attempting to perform any stories geometry here.Furthermore, it is not the crystal violet's concentration.All of the components in that particular reaction become diluted when two substances are mixed together.So, when you combine two milliliters of sodium hydroxide solution with four milliliters of the crystal violet solution.The total of those volumes makes up your new volume.Therefore, the result of mixing them is a six-ml solution.Therefore, we must apply the equation polarity times volume is equivalent to mill, aren? T times volume here in order to get the concentration before any of the sodium hydroxide reacts.The number of moles remains constant because we haven't initiated the reaction yet, and it also remains constant in this location.We therefore have a 2.5 times 10 to 5 molar solution. Therefore, we have a 2.5 x 10-5 molar solution in a four milliliter volume.We are currently working on the new mill arat E.However, we are aware that the current volume of our system is six mL.We shall divide both sides by six to obtain the new milliarat E, and we will discover that the new polarity is 1.67 times 10 to the -5moles per liter.We diluted the crystal violet with our other solutions, which reduced the polarity.
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Density is defined as
Responses
A volume/massvolume/mass
B length to mass ratiolength to mass ratio
C mass to length ratiomass to length ratio
D mass/volumemass
Answer:
D. Density is defined as mass/volume.
what elements does KOH contain
Answer:
K- Potassium
O- Oxygen
H- Hydrogen
KOH is called as Potassium Hydroxide and it contains K (Potassium), O (Oxygen) and H (Hydrogen) elements.
Caustic potash is a common name for potassium hydroxide, an inorganic compound with the formula KOH. The majority of its industrial and niche applications capitalize on its caustic nature and acid reactivity. It important because it is the starting point for most liquid and soft soaps, as well as many chemicals that contain potassium.
It is a dangerously corrosive white solid. KOH has a high level of thermal stability. Melt-casting it into pellets or rods with low surface areas and easy handling properties is common due to its high stability and low melting point. Because KOH is hygroscopic, these pellets become tacky when exposed to air.
Its dissolution in water is strongly exothermic, with water and carbonates accounting for the remaining 90% purity. A common name for concentrated aqueous solutions is potassium lye. Solid KOH does not easily dehydrate even at high temperatures.
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Respiration, which releases the energy in food molecules, usually involves _________
Respiration, which releases the energy in food molecules, usually involves energy and enzymes.
What is respiration?Respiration is the process by which cells obtain chemical energy by the consumption of oxygen and the release of carbon dioxide.
Respiration is the major process through which living organisms obtain their energy. They do this by breaking down food ingested.
Cellular respiration combines glucose and oxygen to synthesise carbondioxide and water as products. This process synthesize a large amount of energy, however, it utilizes energy as well.
Therefore, energy and enzymes are used up in the process of cellular respiration.
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A certain oxygen atom has the electron configuration 1s22s22px22py2. How many unpaired electrons are present?.
There are no unpaired electrons present in this atom of oxygen.
The molecular orbital configuration of the oxygen atom given is,
1s²2s²2px²2py².
As we can see, there is not electron in the configuration which is alone in the orbital, they all are present in pairs. So, there are no unpaired electrons present.
This state of the oxygen atom when there are no unpaired electron are present, this could be the ground state of the atom.
The ground state of the atom is when the potential energy of the electrons of the atom is minimum.
In this configuration, no electron is unpaired, all the electrons are paired.
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Under what conditions is the change in internal energy, δerxn , equal to the heat evolved in a chemical reaction?.
If there is no change in pressure or no change in volume of the system, then the heat of the reaction will be equal to the change in internal energy of the system.
According to the first law of thermodynamics,
The total change in internal energy of the system is equal to the sum of the heat added to the system and the work done by the system.
So, we can write,
ΔH = ΔQ + W
Where,
ΔH is the heat of the reaction,
ΔQ is the heat evolved or heat given,
W is the work done by the system,
We know work by the gas is,
W = VΔP or PΔV
Where V is the volume of the gas and P is pressure of the gas.
So, for the heat of the system to be equal to that of the hear evolved in the system.
W = 0
For W to be zero,
Either, ΔV or ΔP has to be zero,
So, we can conclude that if change in the pressure of the system of the change in volume of the system is zero.
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While traveling, an airplane passenger placed a bag of potato chips in his checked luggage that was placed in the baggage compartment where the air was not regulated. When he opened the luggage after landing, the bag had exploded and potato chips were everywhere in his luggage. Which gas law does this describe?.
Flammable liquids and solids, such as lighter refills, lighter fuel, matches, paints, thinners, fire-lighters, lighters that must be inverted before ignition, matches (these may be carried on the person), radioactive material, briefcases, and attach cases with alarm devices installed.
Food items larger than 3.4 oz are not permitted in carry-on bags and should be stored in checked bags if possible. Food, powders, and other materials that can clog bags and obstruct clear images on the X-ray machine may be instructed to be separated from carry-on bags by TSA officers. Most passengers are permitted to bring one full-size carry-on bag and one personal item for free on their flight. There are some exceptions, such as customers traveling on Basic Economy tickets.
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Answer:
Explanation:
Boyle's law was used when a traveller on a plane packed a bag of potato chips in his checked luggage and put it in the unventilated baggage hold. When the passenger opened the bag after landing, the bag exploded, and there were chips all over his luggage.
Why is Boyle’s law applicable to the airplane passenger?
Let's have a look at the link between pressure and height to better understand how the answer was arrived at.
Altitude increases cause a drop in pressure.
A particular surface has fewer air molecules above it at higher elevations than it does at lower elevations.
This indicates that the pressure is high at ground level and low at the airspace through which an airplane passes.
The gas in the sealed bag of potato chips had expanded, causing the bag to explode.
Given that it demonstrates the relationship between volume and pressure, this circumstance serves as an illustration of Boyle's law.
Basically, Boyle's law states that when pressure lowers, volume rises and vice versa.
What does Boyle’s law state?
If the temperature and amount of gas remain constant in a closed system, the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies.
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what is the proper definition of an isotope? group of answer choices atoms in which the number of protons is different from the number of neutrons. atoms with a mass number greater than the atomic number. atoms of an element with the same number of protons but different number of neutrons. atoms that spontaneously emit radiation.
Isotopes are atoms of an element with the same number of protons but a different number of neutrons.
Isotopes are different atom types that share the same atomic number and place in the periodic table but have different quantities of neutrons in their nuclei, resulting in various nucleon numbers or atomic masses.
Stable and unstable isotopes are the two basic categories of isotopes. 254 stable isotopes are known. Scientists refer to all synthetic (lab-made) isotopes as radioisotopes since they are radioactive due to their instability.
Examples of isotopes include carbon 12, which has 6 neutrons, carbon 13, which has 7 neutrons, and carbon 14, which has 8 neutrons. Carbon 14 is the radioactive isotope while the rest are stable.
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The heating curve shows the energy gain of a substance as it changes from solid to gas. Which section of the graph shows the liquid phase of the
substance gaining kinetic energy?
A. A
B. B
C. C
D. D
E. E
The heating curve is a graphical representation of how various phases of substances change as temperature or heat increases. The graph's C section depicts the liquid phase of the substance gaining kinetic energy.
What is kinetic energy?Kinetic energy is the energy that an object has as a result of its movement. If we want to accelerate an object, we must apply force to it. Using force requires us to put in effort. When the work is finished, energy is transferred to the object, and it moves at a new constant speed.
Therefore,
Section A represents the solid phase
Section B the solid-liquid phase
Section C the liquid phase
Section D the liquid-gas phase
Section E the gas phase
Section C of the graph depicts the substance's liquid phase gaining kinetic energy. Heat energy is absorbed during Phase C, and liquid particles gain kinetic energy to change into gas form in Section E.
As a result, C.C. is the correct answer.
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Suppose you prepare a 5 μ m solution of red dye and a 5 μ m solution of blue dye and observe them in two identical test tubes. Why might the blue dye solution appear more intensely colored than the red dye solution?.
The molar absorptivity of the blue dye is greater than the molar absorptivity of the red dye.
The Beer-Lambert Law equation is as follows
A = εcl
where; ε= molar absorptivity
A= absorbance
l = optical path length
c= molar concentration
The molar absorptivity of the blue dye;
1.30 x 10⁵ M⁻¹cm⁻¹
The molar absorptivity of the red dye :
2.13 × 10⁴ cm⁻¹M⁻¹
This is reason that the blue dye solution appear more intensely colored than the red dye solution
Following are the factors that can affect the molar absorptivity:
1.The amount of light absorbed by the substance for a specific wavelength.
2.The distance that the light travels through the solution.
3.The concentration of the absorbing solution per unit volume.
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a major component of gasoline is octane . when octane is burned in air, it chemically reacts with oxygen gas to produce carbon dioxide and water . what mass of carbon dioxide is produced by the reaction of of octane?
8.70 g of carbon dioxide are generated by the reaction of octane.
Let's compile all the data in one location since we are aware that we will require a balanced equation with masses and molar masses.
M_r: 32.00 44.01
2C₈H₁₈ + 25O₂ ⟶ 16CO₂ + 18H₂O
m/g: 9.88
(a) Calculate the moles of O₂
n = 9.88 g O₂ ×1 mol O₂ /32.00 g O₂
n = 0.3088 mol O₂.
(b) Calculate the moles of CO₂
(16 mol CO2 to 25 mol O2) is the molar ratio.
n = 0.3088 mol O₂ × (16 mol CO₂/25 mol O₂)
n = 0.1976 mol CO₂
(c) Calculate the mass of CO₂
Mass of CO₂ = 0.1976 mol CO₂ × (44.01 g CO₂/1 mol CO₂)
Mass of CO₂ = 8.70 g CO₂
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when 20 grams of a salt is dissolved in 95 grams of water, the temperature of the solution decreases from 40oc to 0oc. how much heat is absorbed? the specific heat of the solution is 1.1 cal/goc.
When 20 grams of a salt is dissolved in 95 grams of water, the temperature of the solution decreases from 40oc to 0oc. 880 calories heat is absorbed, the Specific Heat of the solution is 1.1 Cal/goc.
delta t = T f - T i
= 0 - 40
= -40 degrees Celsius
c = 1.1 Cal/g degrees Celsius
m = 20 grams
heat absorbed (q) = mc(delta)t
q = 20 * 1.1 * -40 degrees Celsius
q = 880 Cal
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how many possible monobromination products of butane are there? include minor product(s) not just the major product(s). if a product exists as a pair of enantiomers be sure to count both enantiomers as a distinct product.
Possible monobromination products of butane are 3.
What is a monobromination?Monobromination as defined by medicine:
an organic molecule is given one bromine atom by the addition process.
In a chemical process known as bromination, a compound is subjected to bromination, which adds bromine to the substance. Following bromination, the result will possess traits distinct from the initial reactant.
Any reaction or process known as bromination entails the introduction of bromine into a molecule alone. Alkene bromination with the electrophilic addition of Br₂. electrophilic aromatic substitution-based bromination of a benzene ring. Benzylic position bromination using a free radical substitution process.
By way of the reaction, a total of three monobrominated compounds will be produced.
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What discovery proved Mendeleev's periodic table to be correct and Newlands' to be
wrong?
The discovery of protons and isotopes
The discovery of oxygen and nitrogen
The discovery of electron shells
The discovery of atomic weight
0/1
Answer: The discovery of protons and isotopes
Explanation: Mendeleev's arrangement by changing the criteria by which elements were arranged and assigned atomic numbers. Mendeleev arranged the periodic table based on the atomic mass of an atom of an element and its chemical properties.
CAN someone please help me !!!!!!!!!!!
Yes, the motor would run faster because the increased electrical force increases the magnetic force in the motor. That is option B.
What are electrical forces?An electrical field is defined as the type of field that is surrounded by charged particles which may be negatively or positively charged.
A battery is an electron chemical cell that has the ability to generate electrical energy through chemical reaction in its cells.
A magnetic force is defined as the type of force generated through the action of moving electric charges or magnetic materials.
When the number of batteries in a circuit is being increased, there would be increase in the input voltage leading to an increase in the magnitude of the speed.
Therefore, the motor is expected to run faster because of the increased magnetic force of the motor which is caused by increase electrical force.
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a 1.0857g sample of a compound containing only carbon, hydrogen, and oxygen was burned in excess oxygen gas. 3.190g of co2 and 0.9360g of h2o were produced. find the empirical formula of the compound
The empirical formula of the compound is C3H4O as the mole ratio is 3 : 4 : 1
1) Mass of carbon (C) in 3.190 g of carbon dioxide (CO₂)
atomic mass of C: 12.0107 g/mol
molar mass of CO₂: 44.01 g/mol
Setting up proportion as:
12.0107 g of C / 44.01 g of CO₂ = x / 3.190 g of CO₂
x = 0.87057 g of C
2) Mass of hydrogen (H) in 0.9360 g of water (H₂O)
atomic mass of H: 1.00784 g/mol
molar mass of H₂O: 18.01528 g/mol
Setting up proportion as:
2 × 1.00784 g of H / 18.01528 g of H₂O = x / 0.9360 g of H₂O
x = 0.10472 g of H
3) Mass of oxygen (O) in 1.0857 g of pure sample
Mass of O = mass of pure sample - mass of C - mass of H
Mass of O = 0.38397 g O ≈ 0.3840 g
4) Mole calculations
C: 0.87057 g / 12.0107 g/mol = 0.07248 mol
H: 0.10472 g / 1.00784 g/mol = 0.10390 mol
O: 0.3840 g / 15.999 g/mol = 0.02400 mol
So, to find empirical formula the mole ratios are:
C: 3
H: 4
O: 1
Thus the mole ratio is 3 : 4 : 1, and the empirical formula is: C3 H4 O
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3. Hydrogen peroxide forms gas bubbles when it is added to blood.
The other reaction product is water. Inserting a glowing splint
into a sample of this gas causes the splint to relight. 20
(a) Identify the gas.
(b) Classify the reaction.
(c) Write a balanced chemical equation for this reaction.
The gas is oxygen which causes the splint to relight and the reaction is of hydrogen peroxide resulting into water and oxygen.
Why hydrogen peroxide forms gas bubbles when it is added to blood?Hydrogen peroxide on reaction and decomposition releases water and oxygen .The reaction followed is something like this: 2H2O2= 2H2O + O2 , putting hydrogen peroxide on a cut.And the bubbles are actually symptomizing that the solution is killing bacteria that is it prevents bacteria to grow.And that solution is true solution which consist of various components in the reaction that is being done.Hence the gas is oxygen , and the reaction is 2H2O2= 2H2O + O2, and its the oxygen gas causing the splint to relight.To know more about hydrogen peroxide visit:
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Dry ice sublimes at −78. 5 oc at a pressure of 1 atm. At room temperature and 1 atm pressure, what is happening to the dry ice molecules on a molecular level as sublimation occurs?.
Dry ice sublimates when its molecules get enough thermal energy to the intermolecular holding the solid crystal together in some cases. This allows some molecules to transition directly into the vapor phase.
What is the process of sublimation?A substance can sublimate directly from its solid to it's own gaseous state without going through a liquid phase. Sublimation is the term most frequently used to describe the process through which snow and ice turn into water vapor in the air before even melting into liquid for those of us who is interested in the water cycle.
Why is sublimation important ?The sublimation procedure is used by chemists to clean up their substances. Typically, a solid is heated in a sublimation apparatus under vacuum. A non-volatile residue of impurities is left behind as the solid volatilizes and condenses as a refined chemical on a cooled surface (cold finger) at this lower pressure.
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boron has two naturally occurring isotopes: boron-10 (abundance 19.8%, mass 10.013 amu), boron-11 (abundance 80.2%, mass 11.009 amu). calculate the atomic mass of boron.
Answer:
Atomic mass of Boron: 10.8 amu
Explanation:
Boron-10: (0.198)(10.013) = 1.98 amu
Boron-11: (0.802)(11.009) = 8.83 amu
Add them up: 1.98+8.83= 10.8 amu