Answer:
Quantum Mechanical
Explanation:
This current atomic model evolved from the earlier Rutherford-Bohr model, which compared electrons orbiting an atomic nucleus to planets orbiting the sun. The newest understanding of atomic makeup in the Electron Cloud Model better represents observed atomic phoneme since the Bohr model rose to prominence.
Answer:
Electron cloud model
Explanation:
Question 4 (1 point)
Neon gas is often used to make signs for restaurants and businesses. However, neon only accounts
for 0.0018% of Earth's atmosphere. Scientists are looking for other elements that have similar
properties as neon that could be used as a substitute. Which of the following elements would most
likely be a good substitute?
Oь
Argon
Flourine
Chlorine
Oxygen
d
Submit
Submit
Answer:
Argon
Explanation:
The element that would most likely be a good substitute for neon is "argon".
These two elements belong to the noble gases in Group 18(8A) of the Periodic Table. They are inert gases - they do not react chemically with other substances.
Argon, as an inert gas is often used whenever an inert atmosphere is needed. Argon is used in incandescent light bulbs. It is used to stop oxygen from corroding the filament. It is also used by welders to protect weld area.
Argon is a good substitute for neon in this context because they possess some physical properties which are similar.
7. Baking soda is a common household chemical compound. The chemical formula
NaHCO3 represents the matter needed to produce baking soda. Baking soda is
considered a compound because. WILL GIVE BRAINLIST
"the tamil naducoast recives winter rainfall "why?
Answer:
GDSSHCVJDJD
Explanation:
please help
I need I badly or I'm going to fail
Answer:
Its B
Explanation:
When testing with the human body i think
g The free energy change of the reaction A (g) ---> B(g) is zero under certain conditions. The STANDARD Free energy change of the reaction is -42.5 kJ. Which of the following statements must be true about the reaction described here? A) The concentration of the product is greater than the concentration of the reactant. B) The reaction is at equilibrium. C) The concentration of the reactant is greater than the concentration of the product.
Answer:
The reaction is at equilibrium.
Explanation:
In thermodynamics, the Gibbs free energy is a term used traditionally to refer to the available or useful work that can be obtained from a thermodynamic system.
Gibbs free energy is a measure of the chemical potential that a reaction has left to do work. Hence, if the free energy is zero, then the reaction has attained equilibrium, and there is no more work to be done
The statement that should be true related to the reaction should be that it should be at equilibrium.
What is Gibbs free energy?In terms of thermodynamics, this energy should be applied for the availability or the useful work that should be obtained via the system of thermodynamics.
Also, it determined the chemical potential where the reaction has left for doing the work. Also in the case when the free energy should be zero so here the reaction should be attained the equilibrium.
hence, the option b is correct.
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The diagram below shows a lithium atom. Which of the following correctly lists the particles in a lithium atom? *
Captionless Image
A. 3 protons, 4 neutrons, 3 electrons
B. 3 protons, 3 neutrons, 4 electrons
C. 4 protons, 4 neutrons, 3 electrons
D. 4 protons, 3 neutrons, 4 electrons
Consider a cylinder of a gasoline engine at the beginning of the compression cycle, during which a fuel/air mixture (for our purposes mostly composed of nitrogen and oxygen, i.e. an ideal gas of diatomic molecules) at 300 K and 1 bar is compressed down to one-tenth volume (compression ratio of 10:1). Assume that the compression is rapid so no heat exchange occurs with the environment. Calculate the pressure and the temperature of the compressed gas. In a diesel engine the compression ratios are typically much higher; redo the same calculation with the compression ratio of 20:1.
Answer:
(i) Final pressure and temperature are 25.119 bar and 753.566 K, (ii) Final pressure and temperature are 66.289 bar and 994.336 K.
Explanation:
This system experiments an adiabatic compression, as such compression happens with no heat interaction between the piston-cylinder device and surroundings. This is a particular case of polytropic process, in which there is no entropy generation according to the Second Law of Thermodynamics.
The compression process is represented by the following formulas:
[tex]\frac{p_{2}}{p_{1}} = \left(\frac{V_{1}}{V_{2}} \right) ^{\gamma}[/tex] (Eq. 1)
[tex]\frac{T_{2}}{T_{1}} = \left(\frac{V_{1}}{V_{2}} \right)^{\gamma - 1}[/tex] (Eq. 2)
Where:
[tex]p_{1}[/tex], [tex]p_{2}[/tex] - Initial and final pressures, measured in bar.
[tex]T_{1}[/tex], [tex]T_{2}[/tex] - Initial and final temperatures, measured in Kelvins.
[tex]V_{1}[/tex], [tex]V_{2}[/tex] - Initial and final volumes, measured in cubic meters.
[tex]\gamma[/tex] - Specific heat ratio of air, dimensionless.
From Theory of Diesel and Otto Cycles we know that compression ratio is defined as:
[tex]r_{c} = \frac{V_{1}}{V_{2}}[/tex] (Eq. 3)
And (Eqs. 1, 2) can be rewritten as follows:
[tex]\frac{p_{2}}{p_{1}} = r_{c}^{\gamma}[/tex] (Eq. 1b)
[tex]\frac{T_{2}}{T_{1}} = r_{c}^{\gamma - 1}[/tex] (Eq. 2b)
Then, we clear final pressure and pressure in each expression and calculate them for each case:
[tex]p_{2} = p_{1}\cdot r_{c}^{\gamma}[/tex]
[tex]T_{2} = T_{1}\cdot r_{c}^{\gamma-1}[/tex]
(i) [tex]r_{c} = 10[/tex], [tex]p_{1} = 1\,bar[/tex], [tex]T_{1} = 300\,K[/tex], [tex]\gamma = 1.4[/tex]
[tex]p_{2} = (1\,bar)\cdot 10^{1.4}[/tex]
[tex]p_{2} = 25.119\,bar[/tex]
[tex]T_{2} = (300\,K)\cdot 10^{0.4}[/tex]
[tex]T_{2} = 753.566\,K[/tex]
Final pressure and temperature are 25.119 bar and 753.566 K.
(ii) [tex]r_{c} = 20[/tex], [tex]p_{1} = 1\,bar[/tex], [tex]T_{1} = 300\,K[/tex], [tex]\gamma = 1.4[/tex]
[tex]p_{2} = (1\,bar)\cdot 20^{1.4}[/tex]
[tex]p_{2} = 66.289\,bar[/tex]
[tex]T_{2} = (300\,K)\cdot 20^{0.4}[/tex]
[tex]T_{2} = 994.336\,K[/tex]
Final pressure and temperature are 66.289 bar and 994.336 K.
15.0 L of an ideal gas at 298 K and 3.36 bar are heated to 350 K with a new pressure of 4.40 atm. What is the new volume in litres?
Answer:
13.3 L
Explanation:
Step 1: Given data
Initial pressure (P₁): 3.36 barInitial volume (V₁): 15.0 LInitial temperature (T₁): 298 KFinal pressure (P₂): 4.40 atmFinal volume (V₂): ?Final temperature (T₂): 350 KStep 2: Convert P₁ to atm
We will use the conversion factor 1 atm = 1.01325 bar.
3.36 bar × (1 atm / 1.01325 bar) = 3.32 atm
Step 3: Calculate V₂
We will use the combined gas law.
P₁ × V₁/T₁ = P₂ × V₂/T₂
V₂ = P₁ × V₁ × T₂/T₁ × P₂
V₂ = 3.32 atm × 15.0 L × 350 K/298 K × 4.40 atm
V₂ = 13.3 L
What is the powerhouse of the cell?
Answer:
Mitochondria is the powerhouse of the cell, but don't let this distract you from the fact that Mr. Krabs sold SpongeBob's soul for 62 cents
Answer:
mitochondria
Explanation:
Which of the following are properties of substances with matter? (2 points)
a
Mass and volume
b
Length and width
c
Shape and color
d
Size and texture
Problem PageQuestion Methanol and oxygen react to form carbon dioxide and water, like this: (l)(g)(g)(g) At a certain temperature, a chemist finds that a reaction vessel containing a mixture of methanol, oxygen, carbon dioxide, and water at equilibrium has the following composition: compoundamount Calculate the value of the equilibrium constant for this reaction. Round your answer to significant digits. Clears your work. Undoes your last action. Provides information about entering answers.
Answer:
[tex]Kc=3.8x10^{-7}[/tex]
Explanation:
Hello.
In this case, for the chemical reaction:
[tex]2CH_3OH(l)+3O_2(g)\rightarrow 2CO_2(g)+4H_2O(g)[/tex]
We write the equilibrium expression including the gaseous or aqueous species only, that is why the methanol is not included due to heterogeneous equilibrium:
[tex]Kc=\frac{[CO_2]^2[H_2O]^4}{[O_2]^3}[/tex]
Whereas each gaseous species is powered to its stoichiometric coefficient (number before the species). In such a way, considering the equilibrium masses of carbon dioxide (44 g/mol), water (18 g/mol) and oxygen (32 g/mol) to be 1.56 g, 2.28 g and 3.33 g respectively, we compute the moles as we need molar concentrations in the equilibrium constant calculation:
[tex]n_{CO_2}=1.56g/(44g/mol)=0.0355mol\\\\n_{H_2O}=2.28g/(18g/mol)=0.127mol\\\\n_{O_2}=3.33 g/(32g/mol)=0.104mol[/tex]
Thus, into the 9.3.L vessel, the equilibrium concentrations are:
[tex][CO_2]=\frac{0.0355mol}{9.3L}=0.00382M[/tex]
[tex][H_2O]=\frac{0.127mol}{9.3L}=0.0137M[/tex]
[tex][O_2]=\frac{0.104mol}{9.3L}=0.0112M[/tex]
Therefore, the equilibrium constant shown with two significant figures is:
[tex]Kc=\frac{(0.00382M)^2(0.0138M)^4}{(0.0112M)^3} \\\\Kc=3.8x10^{-7}[/tex]
Best regards.
Oxides of sulfur are important in atmospheric pollution, arising particularly from burning coal. Use the thermodynamic data at 25 C given in the appendix to answer the following questions. a. In air, the oxidation of SO2 can occur: 1 2O2(g) SO2(g) S SO3(g). Calculate rG 298
Answer:
-70.87 kJ
Explanation:
Let's consider the following balanced equation.
1/2 O₂(g) + SO₂(g) ⇄ SO₃(g)
We can calculate the standard Gibbs free energy of reaction (ΔG°r) from the standard Gibbs free energies of formation (ΔG°f) using the following expression.
ΔG°r = 1 mol × ΔG°f(SO₃(g)) - 1/2 mol × ΔG°f(O₂(g) - 1 mol × ΔG°f(SO₂(g))
ΔG°r = 1 mol × (-371.06 kJ/mol) - 1/2 mol × 0 kJ/mol - 1 mol × (-300.194 kJ/mol)
ΔG°r = -70.87 kJ
Which of the following is the best description of matter?
Answer:
description of matter:
Matter is everything around you. Atoms and compounds are all made of very small parts of matter. Those atoms go on to build the things you see and touch every day. Matter is defined as anything that has mass and takes up space (it has volume).
please give me brainliest if I answered you question correctly
Which of the following always combines in definite proportions?
a. compound
b. homogeneous mixture
c. element
d. heterogeneous mixture
Answer:
The answer is heterogeneous mixture
What is the main limitation of flame tests? Check all that apply.
1. It takes a long time to perform
2.Inability to determine the identity of mixtures
3.Some metals have similar flame test results
4.Color is subjective
Answer:
All of the above are correct.
Explanation:
The Flame Test Shortcomings
Small quantities of most molecules can not be measured by the examination.
The signal's intensity ranges from one test to the next.
The test findings are impaired by impurities or toxins.
The test is not capable of differentiating between all components.
Calculate the number of atoms in a 3.68×103 g sample of aluminum.
Answer:
84.23×10^23
Explanation:
no.of atoms =given wt / gram Mw×avagdro num
A ________________ causes a __________________ heat transfer rate.
Answer:
A smaller temperature difference causes a smaller heat transfer
Explanation:
The greater the temperature difference, the greater the rate at which heat transfers.
What do you notice about the relationship between the force strength and the size of the velocity change? HELP MEEEEE
Velocity change increases as the force increases.
Even though this question is incomplete, but we can approach it from the stand point of Newton's second law of motion.
According to this law, force is directly proportional to change in velocity.
F = m(v - u)/t
F = force applied
m = mass of the body
v = final velocity of the body
u = initial velocity of the body
t = time taken
This means that velocity change increases as force increases.
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(b) in the direct hydration method, ethene reacts with steam. The equation for this reaction is C2H4 + H2O = C2H5OH
State the temperature and pressure used in this reaction.
Answer:
20 degree and 4000000N
Macon is 50 miles away from Atlanta. If it takes Jim one hour to drive from Macon to Atlanta on Monday but takes him an hour and a half on Tuesday, what happened to his speed?
Group of answer choices
It decreased
It increased
It averaged out to the same speed
It stayed the same because the distance stayed the same
Answer:
it decreased
Explanation:
the distance stayed the same, and if it takes him longer to get somewhere than it did another day, it would mean his speed decreased.
When you add milk, sugar and coffee to a cup of hot water, which of these explain that what you formed in a mixture?
A new substances is formed B. You can no longer taste the sugar
C. You can still taste the bittemess of the coffee, the sweetness of the sugar and the creaminess of the milk
D. Each of the part of the mixture changed in color, amount in taste
Answer:
I think it's D. Please let me know if it's wrong or right.
Explanation:
The difference between the two types of succession !!!??!?
Answer:
Hope it help you
Stayhomestaysafe
Plz mark my answer brainliest✍️✍️
Explanation:
Primary succession is the series of community changes which occur on an entirely new habitat which has never been colonized before. For example, a newly quarried rock face or sand dunes. Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat.
REAL NAME - SHRESTH DUBEY
How many electrons are in the highest occupied energy level, n, of an element in Group 15?
Answer:
5 Electrons.
Explanation:
Hello.
In this case, an element in group 15 such as nitrogen has 5 electrons on the outer shell because of its electron configuration. For N, whose atomic number is 7, the electron configuration is:
[tex]N^7: 1s^2,2s^2,2p^3[/tex]
Whereas energy level 2 has 5 electrons (2 from 2s and 3 from 2p). Next element is phosphorous and its electrons configuration is:
[tex]P^{15}:1s^2,2s^2,2p^6,3s^2,3p^3[/tex]
It also has 5 electron on the energy level 3 (2 from 3d and 3 from 3p).
Best regards!
10. Explain the relationship between the group number and the valence electrons
of MAIN GROUP elements (Groups 1, 2, 13-18). *
Valence electrons are electrons that are in the outermost orbitals of an atom. In the periodic table the elements are divided into groups. All elements of the first main group have one valence electron. All elements of the second main group have two valence electrons. And so on:
group 1 - 1 valence electrongroup 2 - 2 valence electronsgroup 13- 3 valence electronsgroup 14 - 4 valence electronsgroup 15 - 5 valence electronsgroup 16 - 6 valence electronsgroup 17 - 7 valence electronsgroup 18 - 8 valence electronswhat is displacement give two examples
Explanation:
nothing it is just a question. you should know the answer . example:you,
Which locations are likely to have subatomic particles that are constantly in motion:
A) 1 and 2
B) 2 and 3
C) 1 and 3
D) 2 and 4
The answer is "2 and 4"
Location 2 and 4 are likely to have subatomic particles that are constantly in motion,thus the correct option is D.
In physics, a subatomic particle is a particle smaller than an atom.According to the Standard Model of particle physics, a subatomic particle can be either a composite particle, which is composed of other particles (for example, a proton, neutron, or meson), or an elementary particle, which is not composed of other particles Particle physics and nuclear physics study these particles and how they interact.
Experiments show that light could behave like a stream of particles (called photons) as well as exhibiting wave-like properties. This led to the concept of wave–particle duality to reflect that quantum-scale particles behave like both particles and waves; they are sometimes called wavicles to reflect this.
Thus, the correct option is D.
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Which health issue is associated with exposure to indoor air pollution?
O stroke
O hair loss
diabetes
O skin cancer
Answer:
stroke
Explanation:
Is crumbling a cookie, a physical change? Explain why. My child is having problems with this question, and I'm not so sure how to explain it.
Answer:
Because the sugar flour and eggs can no longer be separated. The properties of the materials have changed so it's a chemical change
Sugar, flour, and eggs cannot be separated. The materials' properties have changed, resulting in a chemical change.Therefore, crumbling a cookie is not a physical change.
What is physical change ?Physical changes affect a chemical substance's form but not its chemical composition. Physical changes can be used to separate mixtures into their component compounds, but not to separate compounds into chemical elements or simpler compounds.
A chemical change is the transformation of one material into another, the formation of new materials with different properties, and the formation of one or more new substances. It occurs when one substance reacts with another to form a new substance.
A physical change is characterized by a change in physical properties. Melting, transition to a gas, change in strength, change in durability, changes in crystal form, textural change, shape, size, colour, volume, and density are all examples of physical properties.
Thus, crumbling a cookie is not a physical change.
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The early periodic table grouped elements based on similar properties. Which element would be grouped with sodium using this principle.
A. Magnesium
B. Zinc
C.Potassium
D. Sulfur
Answer:
C.Potassium
Explanation:
As we know that Potassium is a mineral also at the same time it is an electrolyte. It helps for muscles work involves the muscles so that the heartbeat and breathing could be controlled.
Now as per the periodic table on an early basis that depends upon the similar properties so the element that should be grouped with the sodium is Potassium
hence, the option c is correct
According to the early periodic table the element that has been grouped together with Na has been Potassium. Thus, option C is correct.
The early periodic table has been consisted of the elements that has been arranged based on the increasing order of the atomic mass. The grouping of the elements has been performed based on the similarities with the elements.
The sodium has been the electrolyte that has been responsible for maintaining the electrolyte balance in the human body. The sodium has been the smaller size element with being highly reactive.
The element that has also been small size with high reactive, and has been able to maintain the body electrolyte balance has been Potassium.
Thus, according to the early periodic table the element that has been grouped together with Na has been Potassium. Thus, option C is correct.
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Which of the following is least like the others on the list?
a. Estrogen
b. Cholesterol
c. Glycogen
d. Triglyceride
Answer:
Glycogen
Explanation:
a,b,d are lipidic and glycogen is glucide
