Answer:
To remedy the stability problem, Bohr modified the Rutherford model by requiring that the electrons move in orbits of fixed size and energy.
If 60. liters of hydrogen gas at 546 K is cooled to 273 K at constant pressure, the new volume of the gas will be
**I NEED ANSWERS STEP BY STEP PLEASE**
The new volume of H₂ gas at constant pressure is 30L.
What is new volume of H₂ gas at constant pressure at given conditions?Apply Charles law,
V₁/T₁=V₂/T₂
Put the given value
V₁=60L, T₁=546K T₂=273K V₂=?
Solve the equation
60/546=V2/273
V₂=30L
Hence, the new volume of H2 gas at constant pressure is 30L.
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ethanol is widely used in antibacterial hand sanitizer and wipes.explain
Explanation:
Ethanol works as an antiseptic as it is capable of breaking down the cellular membrane of cells/ causes cell lysis. It also denatures protiens.
A gas has a volume of 840 mL at -38°C and a pressure of 0.98 atm. If the pressure
changes to 1.37 atm when the gas is heated to 16°C, what is the new volume?
Answer:
X is an element in period 3 with two electrons in the outer shell. Draw a full diagram of the ion form by this element
Which statement is true ? ( only one answer)
A) electrons are larger than protons
B) atoms are the smallest living organism
C) the number of protons in a atom determines the element
What current (in a) is required to plate out 1. 22 g of nickel from a solution of ni2 in 0. 50 hour?
The current required to accumulate the 1.22 grams of nickel in 0.5 hours is 2.23 A.
What is current?The current is given as the product of the charge with time. In the electrochemical analysis of the nickel, there will be a reduction of the nickel ion to nickel. The formation is given as:
[tex]\rm Ni^{2+}+2e^-\;\rightleftharpoons Ni[/tex]
There is the deposition of 1 mole of Ni with 2 electrons transfer. The transfer of charge for 1 mole that is 58.7 grams Nickel is:
[tex]\rm 58.7\;g=2\;\times\;96487\;C\\58.7\;g=192974\;C[/tex]
The mass of Ni to be deposited is 1.22 grams. The charge required is given as:
[tex]\rm 58.7\;grams\;Ni=192974\;C\\\\1.22\;grams\;Ni=\dfrac{192974}{58.7}\;\times\;1.22\;C\\\\1.22\;grams\;Ni=4010.7\;C[/tex]
The current required to transfer 4010.7 C of charge in 1800 seconds is given as:
[tex]\rm Charge=Current\;\times\;Time\\4010.7\;C=Current\;\times\;1800\;sec\\Current=2.23\;A[/tex]
Thus, the current required to accumulate the 1.22 grams of nickel in 0.5 hours is 2.23 A.
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Nuclear fission is the combining of small nuclei into larger ones
Answer:
False.
Explanation:
The combining of the nuclei of atoms is known as nuclear fusion.
The statement that nuclear fission is the combining of small nuclei into larger ones is false.
What is nuclear fission?Nuclear fission is a process in which one nucleus splits into two or more small nuclei. The process release large amount of energy and produce gamma photons.
Opposite to it, Nuclear fusion is a process of combining of small nuclei into larger ones.
Thus, the statement is false, because nuclear fission is a process of splitting of a nucleus.
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In the bohr model of the hydrogen atom, the radius of the electron orbit increases by a factor of four. What happens to the magnitude of the orbital angular momentum of the electron?
The magnitude of the orbital angular momentum of the electron is doubled when the radius of the electron orbit increases by a factor of four.
What is orbital angular momentum?
The orbital angular momentum is the sum of angular momenta of all electrons, it is the rotational analog of the linear momentum.
The formula of angular momentum
[tex]\rm mvr = \dfrac{nh}{2 \pi}[/tex]
Thus, the magnitude of the orbital angular momentum of the electron is doubled when the radius of the electron orbit increases by a factor of four.
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An elemental gas has a mass of 10. 3g. If the volume is 58. 4 l and the pressure is 758 torr at a tempertaure of 2. 5 c what is the gas
The required elemental gas which has a mass of 10.3 g in the given conditions is helium gas.
How do we calculate molar mass?Relation between the molar mass and moles of any substance will be represented as:
n = W/M, where
W = given massM = molar massMoles of gas will be calculated by using the ideal gas equation:
PV = nRT, where
P = pressure = 758 torrV = volume = 58.4Ln = moles = ?R = universal gas constant = 62.363 L.torr / K.molT = temperature = 25 degree C = 298KOn putting all values, we get moles
n = (758)(58.4) / (62.363)(298) = 44,267.2 / 18,584.2
n = 2.38 moles
Molar mass of the gas will be calculated by using the above first equation is:
M = 10.3g / 2.38mol = 4.32 g/mol = 4g/mol (approx)
Hence given elemental gas is helium.
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a seashell composed largely of calcium carbonate reacts with a solution of HCl . As a result, 1500 ml of dry co2 gas at stp. How many grams of caco3 are consumed at the reaction
The amount of CaCO₃ that are consumed at the reaction is 6.7 grams.
What is ideal gas equation?Ideal gas equation will be represented PV = nRT from which we can calculate the moles of carbon dioxide, where
P = standard pressure = 1 atmV = standard volume = 1500mL = 1.5LT = standard temperature = 273 KR = universal gas constant = 0.082 L.atm/K.molOn putting all these values, we get
n = (1)(1.5) / (0.082)(273) = 0.0669 moles = 0.067 mol
Given chemical equation is:
CaCO₃ + 2HCl → CO₂ + CaCl₂ + H₂O
From the stoichiometry of the reaction it is clear that,
1 moles of CO₂ = produced by 1 moles of CaCO₃
0.067 moles of CO₂ = produced by 0.067 moles of CaCO₃
Now mass of CaCO₃ will be calculated as:
n = W/M, where
n = moles = 0.067molW = required mass = ?M = molar mass = 100g/molW = (0.067)(100) = 6.7g
Hence required mass of CaCO₃ is 6.7g.
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if you have 4.00 moles of gas at a pressure of 6.35 atm and a temperature of 1973 K, what is the volume
Answer:
101.98 L
Explanation:
Ideal Gas Law PV = n R T R = gas constant = .082057 L-atm/mol-K
6.35 (V) = 4 * .082057 * 1973
V = 101.98 L
What type of soil has the most permeability
The balanced equation shows how sodium chloride reacts with silver nitrate to form sodium nitrate and silver chloride. nacl agno3 right arrow. nano3 agcl if 4.00 g of nacl react with 10.00 g of agno3, what is the excess reactant? agcl nacl agno3 nano3
Answer:
The excess reactant is the NaCl.
Explanation:
NaCl(aq) + AgNO3 (aq) → NaNO₃(aq) + AgCl (s) ↓
This is a precipitation reaction.
We need to convert the mass of each reactant to moles:
4 g / 58.45 g/mol = 0.068 moles of NaCl
10 g / 169.87 g/mol = 0.059 moles of nitrate.
As stoichiometry is 1 by 1, 1 mol of chloride will react with 1 mol of nitrate.
If I have 0.059 moles of nitrate, I will need the same amount of chloride and I have 0.068 moles. I still have chloride, therefore the excess reactant is the NaCl.
0.068 mol - 0.059 mol = 0.009 moles are the moles of NaCl that remains after the reaction is complete
Answer:
NaCl
Explanation:
Which type of organism transfers the most energy in a food web?
F. Consumer
G. Producer
H. Decomposer
J. Prey
Answer:
Producers.
Explanation:
Since the source of energy is the sun, the trophic level representing producers contains the most energy.
What is the temperature (in °C) if 12.1 g of N2 in a 1.3 L container has a pressure of 5.8 atm?
Answer:
T=-166.8 C
Explanation:
PM=m/vRT
T=PMV/mR
T=5.8*14*1.3/12.1*0.08206
T=106.3K
=106-273.15=-166.8 C
In a sample of copper carbonate, how much copper and oxygen would there be for 5 g of carbon?
What is the entropy change if one mol of water is warmed from 0 c to 100 c
The entropy change if one mole of water is warmed from 0 degree C to 100 degree C is 1,316.7 J/K.
How do we calculate the entropy change?Change in entropy will be measured by using the below equation as:
ΔS = (n)(Cp)ln(T₂/T₁), where
n = moles of water = 1 mol
Cp = specific heat of water = 4180 J/mol.K
T₂/T₁ = ratio of temperatures in K = 373 / 273 = 1.37 K
On putting values, we get
ΔS = (1)(4180)ln(1.37) = (4180)(0.315)
ΔS = 1,316.7 J/K
Hence required value of entropy is 1,316.7 J/K.
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Please help me on #2 giving BRAINLIEST!
Answer:
basic
Explanation:
because H is hydrogen
2 NH3 + 3 CuO → 3 Cu + N₂ + 3 H₂O
In the above equation, how many grams of N₂ can be made when 18.4 moles of CuO are consumed?
Answer:
→ 22.9 g of N2.
Explanation:
→ The molar mass of CuO is 63.5 + 16 = 79.5
→ The molar mass of N2 is 2×14 = 28
According to the equation, for every 3 molecules of CuO, one molecule of N2 is made.
Therefore,
3×79.5 g of CuO make 28 grams of N2.
Therefore,
195 g of CuO make
[tex]28×(195/3×79.5) = 22.9 g of N2.[/tex]
Potassium carbonate (K2CO3) has one potassium atom bonded to carbon, and that carbon is also bonded to three oxygens. Their electronegativities are shown in the list:
K: 0.82
C: 2.55
O: 3.44
How would you describe the bonds (K–C and C–O) in this molecule?
1: K-C is iconic, and C-O is covalent
2: K-C is iconic, and C-O is nonpolar covalent
3: K-C is polar covalent, and C-O is nonpolar covalent
4: K-C is polar covalent, and C-O is polar covalent
Answer:
Based on the electronegativity difference between them, K-C is ionic, and C-O is polar covalent.
What is a bond?
A bond is formed by the interaction of two atoms. A bond can be either ionic or covalent.
Now we have to look at the electronegatives on each bond. The electronegativity difference between the K-C bond is larger than that between the C-O bond hence, K-C is ionic, and C-O is polar covalent.
Explanation:
Chemical bonds are formed when potential energy is when it’s High or Low?
Answer:
high I think
Explanation:
i just did it
Answer:
Bond forms to get stability. Stability will be maximum at low potential energy. So, in bond formation, atoms loose their potential energy to get stabilized and heat is evolved. Generally bond formation is also an exothermic reaction
sample of helium gas contains 0.22 moles of helium. How many additional moles of helium gas must be added to the sample to obtain a volume of 6.4L
The required additional moles of helium gas must be added to the sample to obtain a volume of 6.4L is 0.293 moles.
How do we calculate the required moles?Required moles of the final volume will be calculated by using the below equation as:
n₁/V₁ = n₂/V₂, where
n₁ & V₁ are the moles and volume of initial solution.
n₂ & V₂ are the moles and volume of final solution.
On putting values from the question to the equation, we get
n₂ = (0.22)(6.4) / (4.8) = 0.293 moles.
Hence required moles of helium gas is 0.293.
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stoichometry in chemistry!! please someone help i'm begging you, if i fail this then i fail chemistry
Answer:
You can find in the given attachemnet
What factors have caused the rise in global temperatures over the past century?
Answer:
Explanation:
Global warming is the unusually rapid increase in Earth's average surface temperature over the past century primarily due to the greenhouse gases released as people burn fossil fuels.
A device that sends electrical impulses to the heart to correct an irregular
heartbeat is called what?
O A. A pacemaker
O B. An electrical heart valve
O C. A nanotube
O D. A stent
Damian places a negatively charged balloon in a magnetic field. Which direction will the balloon move?
1. West to East
2. East to West
3.South to North
4. North to South
Answer:
4.North to south
Explanation:
In magnetic fields, the north pole is considered negative while the south pole is considered positive. Hence the balloon will be attracted from the north towards the south pole since it is negatively charged.
The water in Mario's swimming pool absorbs energy as heat during the day. Which of the following
would the water in the pool be most likely to do?
Answer: evaporate
Explanation:
The diagram is an example of which of the following..
a) an alkyne
b) an alkane
c) an aldehyde
d) an alkene
Thats an alkane.
Option B.
Answer:
option b) is the answer ..that an alkane
how can coefficients be used to balnce a chemical equation?
At 218°C, Keq=1.2 x 10^-4 for the equilibrium NH4SH(s) ⇋ NH3(g) + H2S(g). Calculate the equilibrium concentrations of NH3 and H2S if a sample of solid NH4SH is placed in a closed vessel at 218°C and decomposes until equilibrium is reached. (2 sig figs, M) (Hint: begin by writing an expression for the equilibrium constant.)
At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.
What is the equilibrium constant?The equilibrium constant (Keq) is the ratio of the product of the concentrations of the products to the product of the concentrations of the reactants, all raised to their stoichiometric coefficients.
Only gases and aqueous species are included.
Step 1. Make an ICE chart.NH₄SH(s) ⇋ NH₃(g) + H₂S(g)
I 0 0
C +x +x
E x x
Step 2. Write the equilibrium constant.Keq = 1.2 × 10⁻⁴ = [NH₃] [H₂S] = x²
x = 0.011 M
At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.
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What does the radical do in a seed of a plant
[tex]\huge{\green}\fcolorbox{blue}{cyan}{\bf{\underline{\red{\color{red}Answer}}}} [/tex]
It is the embryonic root inside the seed. It is the first thing to emerge from a seed and down into the ground to allow the seed to suck up water and send out its leaves so that it can start photosynthesizing. The radicle emerges from a seed through the micropyle.