Exactly one mole of an ideal gas is contained in a 2.00-liter container at 1,000 K. What is the pressure exerted by this gas?
Given: R = 0.08205 L · atm/K · mol
Answer : The pressure of the gas is, 41.025 atm
Solution :
Using ideal gas equation :
[tex]PV=nRT\\\\P=\frac{nRT}{V}[/tex]
where,
n = number of moles of gas = 1 mole
P = pressure of the gas = ?
T = temperature of the gas = 1000 K
R = gas constant = 0.08205 L.atm/mole.K
V = volume of gas = 2.00 L
Now put all the given values in the above equation, we get the pressure of the gas.
[tex]P=\frac{nRT}{V}[/tex]
[tex]P=\frac{1mole\times (0.08205L.atm/mole.K)\times 1000K}{2.00L}[/tex]
[tex]P=41.025atm[/tex]
Therefore, the pressure of the gas is, 41.025 atm
A 14.01 g sample of N2 reacts with 3.02 g of H2 to form ammonia (NH3). If ammonia is the only product, what mass of ammonia is formed?
Does acetylene, C2H2 have a linear shape and the bond angle of 180º?
The following is an example of what type of chemical reaction?
CH4 (g) + 2O2 (g) CO2 (g) + 2H2O (g)
Select one:
a. Single replacement
b. Decomposition
c. Double replacement
d. Combustion
Consider the equation CaF2 + H2SO4 → CaSO4 + 2 HF. What type of reaction is this?
A. synthesis
B. decomposition
C. single displacement
D. double displacement ...?
The reaction between CaF2 and H2SO4 to form CaSO4 and HF is a double displacement reaction, where two compounds exchange ions.
Explanation:The reaction CaF2 + H2SO4 → CaSO4 + 2 HF is an example of a double displacement reaction. In this type of reaction, two compounds exchange ions or other groups to form two new compounds. In this particular reaction, CaF2 and H2SO4 trade their anions, resulting in the formation of CaSO4 and HF. Another name for this type of reaction is a metathesis reaction. It is important to note that this reaction is different from a synthesis, decomposition, or single displacement reaction.
Use VSEPR theory to predict bond angles in the following covalently bonded molecules. Explain your predictions.
a. methane
b. ammonia
c. water
Answer: Bond angle for methane is 109.5°,Bond angle for ammonia is 107° and Bond angle for water is 104.5°
: [tex]Formula used :{\text{Number of electrons}} =\frac{1}{2}[V+N-C+A][/tex]
where, V = number of valence electrons present in central atom
N = number of monovalent atoms bonded to central atom
C = charge of cation
A = charge of anion
a. Methane:[tex]CH_4[/tex]
In the given molecule, carbon is the central atom and there are 4 Hydrogens as monovalent atoms.
[tex]Formula used :{\text{Number of electrons}} =\frac{1}{2}[4+4-0+0]=4[/tex]
The number of electrons is 4 that means the hybridization will be [tex]sp^3[/tex] and geometry of the molecule will be tetrahedral.The bond angle for terahedral geometry is 109.5°.
b. Ammonia:[tex]NH_3[/tex]
In the given molecule, nitrogen is the central atom and there are 3 Hydrogens as monovalent atoms.
[tex]Formula used :{\text{Number of electrons}} =\frac{1}{2}[5+3-0+0]=4[/tex]
The number of electrons is 4 that means the hybridization will be [tex]sp^3[/tex] and geometry of the molecule will be pyramidal as there are three bond pairs and one lone pair.The bond angle for pyramidal geometry is 107°.the bond angle reduces due to lone pair bond pair repulsions.
c. water :[tex]H_2O[/tex]
In the given molecule, oxygen is the central atom and there are 2 Hydrogens as monovalent atoms.
[tex]Formula used :{\text{Number of electrons}} =\frac{1}{2}[6+2-0+0]=4[/tex]
The number of electrons is 4 that means the hybridization will be [tex]sp^3[/tex] and geometry of the molecule will be bent as there are two bond pairs and two lone pairs.The bond angle for pyramidal geometry is 104.5°.The bond angle reduces further due to greater lone pair-lone pair repulsions.
Explain how conduction can increase the temperature of the air above Earth's surface. ...?
The temperature of the air above Earth's surface is mainly increased through convection, where warm air becomes less dense and rises, getting replaced by cooler air in a cycle. Conduction is inefficient over large distances, and radiation also contributes to heat transfer in the environment.
Explanation:Conduction is the process where heat is transferred through direct contact between materials, but conduction alone is not very efficient for warming the air above Earth's surface over large distances or in short times. Instead, the increase in air temperature is largely due to convection. This process involves the movement of warm air upward as it becomes less dense when heated, creating buoyant forces. As the warmer air rises, it is replaced by cooler air from surrounding areas, which then gets heated by the Earth's surface. In this way, convection creates a cycle that effectively distributes heat throughout the atmosphere.
Another form of heat transfer that plays a role in the earth's atmosphere and engine cooling is radiation. Radiation is the emission of energy as electromagnetic waves, which can transfer heat without the need for a medium. This is why we experience warmth from the sun even though there is a vacuum of space between the Earth and the sun.
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Conduction is less efficient for warming the atmosphere and is surpassed by convection, where warm air rises due to decreased density as it heats, creating a cycle that distributes heat in the atmosphere.
Explanation:Conduction can increase the temperature of the air above Earth's surface through the process where heat is transferred through the direct contact of atoms and molecules. However, it is relatively inefficient for heating the atmosphere significantly because conduction is not effective over large distances and short time frames. Instead, the warming of the air is primarily the result of convection currents: warm air heated at the surface expands, becomes less dense, and rises, being replaced by cooler air that gets heated in turn. This creates a circulation pattern that helps distribute heat. It is due to the natural convection driven by buoyant forces that large-scale atmospheric circulation and ocean currents transfer heat around the globe, NOT primarily through conduction.
sa solution is made by dissolving 26.42 g of (NH4)2SO4 in enough H2O to make 50.00 mL of solution. what is the molarity of the solution
Molarity is a measure of the concentration of solute in a solution
c = n ÷V
c - concentration of solute,
n - number of moles of solute
V - volume of solution
We know:
V = 50.00 mL = 0.05 L
c = ?
n = ?
Let's calculate concentration:
c = m/(V * Mr)
Which is the second step in the dissolving process?
The solute is mixed with the solvent.
The solute ions are carried into the solution.
The solvent molecules surround the solute particles.
The solvent molecules are attracted to the surface of the solute particles.
Answer : The correct option is, The solvent molecules surround the solute particles.
Explanation :
Dissolving process : It is defined as the process in which solute particles interact with solvent molecules.
When solute particles comes in contact with the solvent particles, firstly the solute particles break down into ions and this result in the Lattice energy of the solute particles.
When solute particles break down, it gets surrounded with the solvent particles and it results in the Hydration enthalpy of the particles.
Hence, the second step of dissolving process is when solvent molecules surround the solute molecules.
Answer:
c
Explanation:
the answer befor me is corect
Wind is caused by which type of heat transfer? Radiation/conduction/or convection
Wind is primarily created by the process of convection, which is the macroscopic movement of air due to differences in temperature. Warm air rises and cool air sinks, leading to the movement of air known as wind. Conduction and radiation, although also types of heat transfer, do not predominantly contribute to the formation of wind.
Explanation:Wind is primarily caused by convection, which is one of the three types of heat transfer, including conduction and radiation. In the context of our atmosphere, convection is the movement of layers of air due to differences in temperature.
Essentially, warm air, being lighter, rises and cool air, being heavier, sinks. This continuous cycle of heating, rising, cooling and falling gives rise to winds, in an effort to equalize global temperatures. An example of this heat transfer can be seen in weather systems. The movement of air mass creating winds is a product of such convection currents.
It's important to differentiate between this and the other types of heat transfer. For instance, conduction is heat transfer through direct contact of two objects, while radiation is heat transfer through electromagnetic waves, neither of which primarily contributes to the creation of wind.
Learn more about Convection here:https://brainly.com/question/4138428
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Select the sentence that best describes why copper and some other metals are good conductors.
Answer
Copper atoms have loosely held electrons; this means they can freely move in and out of the nucleus of the atom.
Copper atoms have a loosely held free electron in their outer shell that is able to move freely to other atoms.
Copper and some other metals have highly active inner shells. This means that electrons can be freely exchanged between shells.
Copper has a small number of electrons; this means it can easily shed these electrons and take electrons from other atoms.
...?
Answer: Option (b) is the correct answer.
Explanation:
Electronic configuration of copper is [tex][Ar]4s1 3d^{10}[/tex] and copper is known as the best conductor of heat and electricity.
This is because in copper there is availability of free electrons in its valence shell (outermost shell).
And, as it is known that electricity is the flow of electrons. This means that since copper metal contains a number of free electrons. Hence, it can easily conduct electricity.
Thus, we can conclude that copper and some other metals are good conductors because copper atoms have a loosely held free electron in their outer shell that is able to move freely to other atoms.
What is the definition of heat?
A teacher makes the following statement.
“Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.”
What topic is the teacher most likely talking about?
a. distillation of a mixture
b. filtration of a pure substance
c.evaporation of a mixture
d. sorting of a pure substance
Answer:
The correct answer is option a.
Explanation:
According the question, boiling points of different liquids are discussed which means that if we take all these liquids in single mixture we can separate them from each other on the basis of their difference in boiling point. And the technique which employs this principle is distillation process.
Hence, we can say teacher is most likely talking about distillation of a mixture of oils.
Distillation is a process which is used to separate mixture of different liquids from each other. In this process, during the course of boiling of mixture liquid compound with lower boiling points vaporizes first leaving behind the liquid with higher boiling point behind.
And vapors of boiled liquid are condensed down in a separate container for the collection.
The wavelength of a certain beam of light was [tex]3.52 x 10^-^7[/tex].
Calculate how much energy this light has.
If Plank's constant is 6.6 x 10(-34) J/Hz, then what is the approximate frequency of a photon having an energy of 3 x 10(-19) Joules?
Final answer:
The approximate frequency of a photon with an energy of 3 x 10⁻¹⁹ Joules is 4.545 x 10¹⁴ Hz, calculated using Planck's equation E = hf.
Explanation:
To calculate the frequency of a photon with a given energy, we use the equation E = hf, where E denotes the energy of the photon, h is Planck's constant, and f is the frequency of the photon. In this question, the energy (E) is given as 3 x 10⁻¹⁹ Joules, and Planck's constant (h) is given as 6.6 x 10⁻³⁴ J/Hz. By rearranging the equation to solve for the frequency, we get f = E/h.
With the supplied values substituted, the computation is as follows:
f = (3 x 10⁻¹⁹ J) / (6.6 x 10⁻³⁴ J/Hz) = 4.545 x 10¹⁴ Hz.
Therefore, the approximate frequency of the photon is 4.545 x 10¹⁴ Hz.
How many moles of each element 19.5g platinum
Tissues combine to form Blank Space __________.
A.organisms
B.organs
C.organ systems
D.cells
Which of the answer choices accurately describes a trend that occurs when moving left to right across periods?
(Select all that apply.)
reactivity increases
atomic radius increases
atomic mass increases
valence electrons decrease
Moving left to right across a period on the periodic table, atomic radius decreases due to a stronger nuclear pull on electrons, while atomic mass increases because of the addition of protons and neutrons.
Two key factors affecting these trends include the increase of the atomic number (Z) and the effective nuclear charge felt by valence electrons. As a result, several trends can be observed：
Reactivity does not uniformly increase; it typically decreases for metals and increases for nonmetals.
Atomic radius decreases due to the increasing effective nuclear charge.
Atomic mass increases because elements have more protons, neutrons, and electrons.
Valence electrons generally increase, not decrease, as we add more electrons to fill the outermost shell.
When considering the provided trends, atomic radius decreasing and atomic mass increasing are trends that accurately describe what happens when moving left to right across a period. The atomic radius decreases mainly because a greater nuclear charge exerts a stronger pull on the electrons, drawing them closer to the nucleus. As the atomic mass increases, this is because protons and neutrons are being added to the nucleus as you move across the period. While reactivity varies depending on the type of elements (metals or nonmetals), we know that valence electrons actually increase as we move across a period, which is contrary to one of the listed answer choices.
One of the isotopes of sulfur is represented as sulfur-35 or S-35. What does the number 35 signify?
Final answer:
The number 35 in sulfur-35 represents the mass number of the isotope, which is the total number of protons and neutrons in the nucleus. Sulfur, with atomic number 16, has 19 neutrons in this isotope.
Explanation:
The number 35 in the isotope sulfur-35 or S-35 signifies the mass number of the isotope. The mass number is the sum of the number of protons and neutrons in an atom's nucleus. Sulfur's atomic number is 16, meaning it has 16 protons. To find the number of neutrons in sulfur-35, we subtract the atomic number from the mass number, yielding 35 - 16 = 19 neutrons. Sulfur has several isotopes, including sulfur-32, sulfur-33, sulfur-34, and sulfur-36, with varying neutron numbers and natural abundances. Sulfur-35 is a less common isotope and is not found in significant abundance.
A single atom of platinum has a mass of 3.25 x 10^-22 g. What is the mass of 6.0 x 10^23 platinum atoms?
Students in Mr. Klein’s chemistry class are conducting an experiment to calculate the specific heat of a copper sample. Mr. Klein requires each lab team to repeat the experiment until their percent error is 2% or less. Percent error is calculated using observed values (those students calculate from their lab results) and the true value (the accepted value based on reference). The formula for percent error is: (observed – true) x 100 true If the accepted value for the specific heat of copper is 0.385 J/g°C, which of the following lab teams have an unresolved problem on their hands
a.
team 1: calculates 0.392 J/gºC
b.
team 2: calculates 0.395 J/gºC
c.
both teams
d.
neither team
Final answer:
Team 2 has a percent error greater than 2% with their specific heat calculation of copper, while Team 1's percent error is within the acceptable range. Thus, Team 2 has an unresolved problem regarding their experiment.
Explanation:
To determine which lab teams have an unresolved problem based on their calculation of the specific heat of copper, we first need to calculate the percent error using the given formula:
Percent error = ((observed - true) × 100) / true
Where 'observed' is the experimental value and 'true' is the accepted value.
The accepted value for the specific heat of copper is 0.385 J/g°C. We can now calculate the percent error for each team:
Team 1: ((0.392 - 0.385) × 100) / 0.385 = approximately 1.82%Team 2: ((0.395 - 0.385) × 100) / 0.385 = approximately 2.60%Team 1 has a percent error within the 2% limit set by Mr. Klein, while Team 2 has exceeded it. Therefore, the answer is:
b. team 2: calculates 0.395 J/gºC
1.15 g of a metallic element reacts with 300 cm3 of oxygen at 298 K and 1 atm pressure, to form
an oxide which contains O2– ions.
What could be the identity of the metal?
A calcium
B magnesium
C potassium
D sodium
what is the main energy conversion that occurs when you plug in a lamp
Answer:
Electric energy conservation which converts into heat and light
Explanation:
The transformation of energy from one form energy into another form, and throughout this conversion, the energy that we give to a device will comes out. However, the energy that is given may or may not coming out in the required form.
For example, we plug in a lump means we give an electrical energy into a lamp and the lamp produces light, but we also get heat energy from the lamp(it is the form of energy which is undesirable coming from a lamp).
Determine the number of moles of compound in each of the following samples.?
4.50g H2O
471.6g Ba(OH)2
129.68g Fe3(PO4)2
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
For 1: 4.50 g of waterGiven mass of water = 4.50 g
Molar mass of water = 18 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of }H_2O=\frac{4.50g}{18g/mol}=0.25mol[/tex]
Hence, the moles of given amount of water is 0.25 moles.
For 2: 471.6 g of barium hydroxideGiven mass of barium hydroxide = 471.6 g
Molar mass of barium hydroxide = 171.34 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of }Ba(OH)_2=\frac{471.6g}{171.34g/mol}=2.75mol[/tex]
Hence, the moles of given amount of barium hydroxide is 2.75 moles.
For 3: 129.68 g of iron phosphateGiven mass of iron phosphate = 129.68 g
Molar mass of iron phosphate = 150.82 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of }Fe_3(PO_4)_2=\frac{129.68g}{150.82g/mol}=0.86mol[/tex]
Hence, the moles of given amount of iron phosphate is 0.86 moles.
Which of the following two cycles are the most closely related in their role in sustaining life?
a. carbon and nitrogen
b. water and nitrogen
c. carbon and oxygen
d. nitrogen and phosphorus please select the best answer from the choices provided a b c d
Answer: d. nitrogen and phosphorus
Nitrogen and phosphorus are important component of the genetic material present in the living organism, required for the expression of genes to perform a desire function in the living organisms. Both nitrogen and phosphorus are chief ingredients of the fertilizers required for the plant growth. Hence, nitrogen and phosphorous are two cycles that are most closely related in their role in sustaining life.
i need the answer to 10 please help
density of gold is 19.3 g/cm^3 what is the mass of nugget that has a volume 1.47cm^3
Answer:
28.372 grams is the mass of nugget.
Explanation:
Density is defined as mass of the substance present in unit volume of the substance.
[tex]Density=\frac{Mass}{Volume}[/tex]
Mass of gold nugget = m
Volume of gold nugget = V =[tex] 1.47 cm^3[/tex]
Density of the gold = [tex]d=19.3 g/cm^3[/tex]
[tex]m=d\times V=19.3 cm^3\times 1.47 cm^3=28.372 g[/tex]
28.372 grams is the mass of nugget.
Is matter lost when a candle is burned
4.What did J. J. Thomson observe when he applied electric voltage to a cathode ray tube in his famous experiment?
A.The stream of cathode ray particles was moving very slowly.
B.The glass opposite of the negative electrode started to glow.
C.The electric voltage had little effect on the stream of particles.
D.The tube contained two pieces of metal that served as electrodes.
11.The table below gives the data that is needed to calculate the average atomic mass of element B.
B-10(Isotope), 10.01(Atomic mass), 19.91(Relative abundance %)
B-11(Isotope), 11.01(Atomic mass), 80.09(Relative abundance %)
Correct option is B
B.The glass opposite of the negative electrode started to glow.
Explanation:In his experiment, tubes were two electric plates, producing a positive anode and a negative cathode, which he expected that it would deflect the rays. As he supposed, the rays were deflected by the electric charge, proving beyond doubt that the rays were made up of charged particles bearing a negative charge.
Answer 11:Boron is a chemical element in the periodic table with symbol B and has atomic number 5.
Boron has two naturally occurring isotopes Boron-10 and Boron-11. The average atomic mass of these are calculated as
(10.01×0.198) + (11.01×0.802) = 10.81 amu
So, the average atomic mass of the Boron isotopes is 10.81 amu.
Answer:
The answer is b
Explanation:
I just recently did the test
. which of these statements is about reaction rate is accurate
A. All chemical reactions occur at a fast rate.
B. All chemical reactions occur at a slow rate.
C. All chemical reactions occur at different rates.
D. All chemical reactions occur at the same rate.