Which postulate of daltons atomic model was later changed and why
why don't we have a lunar eclipse every month?
PLEASE HURRY
Answer:
Beacause it does just in a different place
Explanation:
Because the Earth's orbit around the sun differs from the Moon's orbit around the Earth, lunar eclipse don't happen every month.
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The enthalpy of combustion for octane (C8H18(l)), a key component of gasoline, is –5074 kJ/mol. The reaction equation is: C8H18(l) + 12.5O2(g) (arrow) 8CO2(g) + 9H2O(g).
What is the (triangle)H (subscript f) for this reaction?
16CO2(g) + 18H2O(g) (arrow) 2C8H18(l) + 25O2(g)
Answer:
10,148 kJ
Explanation:
Did it on Engenuity 2022 and got it right - just double 5074
Answer:
10,148
Explanation:
derive the electric field at an axial point.
please help
don't spam
Answer:
[tex]\huge\underline{\red{A}\blue{n}\pink{s}\purple{w}\orange{e}\green{r} -}[/tex]
before looking at what the question says ,
let's have some general information related to the topic of the question !
__________________________
[tex]\implies \: [/tex] Electric field refers to the force generated by a nearby charge in the surroundings.
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[tex]\implies \: [/tex] Mathematically ,
Electric field = [tex]\frac{Kq}{r^{2}} \\[/tex]
where ,
K = coulomb's constant
q = magnitude of charge
r = distance between the opposite terminals
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[tex]\implies \: [/tex] Dipole moment , P = 2qd
where ,
q = magnitude of charges
d = distance between the charges
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[tex]\implies \: [/tex] positive charge tends to throw the field away from it while negative charge tends to pull the field towards it !
_____________________________________
seems like enough of information , so now let's look at the derivation !
refer the attachments in order to see the derivation !
Final answer -
[tex]\bold\pink{E = \frac{2kp}{(x {}^{2} - d {}^{2} ) {}^{2} } } \\ [/tex]
while , for a short dipole
[tex]\bold\pink{E = \frac{2pk}{x {}^{3} }} \\ [/tex]
hope helpful :D
Use the table below to answer questions 3-5.
Molality (m) Potassium
Water
Molality | Potassium | Water
А | 45 g | 1600 g
5.1 | B | 3.2 kg
2.5 | 4.5 moles | C
Calculate the value of A,B and C
Answer:
5.1 | B | 3.2 kg
Explanation:
Why are engineers an important part of the space exploration team?
----------------------
OPTIONS:
A) They use state-of-the-art technology.
B) They use the information that astronauts gather to make advancements in other fields of science.
C) They design and build spacecraft, space vehicles, and satellites.
D) They help astronauts train for weightlessness and spacewalks.
Which of the following identifies the part of the solution that is the dissolved substance?
A.
solvent
B.
base
C.
acid
D.
solute
By the way the answer is D if anyone searched this up
Answer: D
Explanation:
This is just a definition.
Methane versus carbon dioxide are very important greenhouse gases. However, methane can retain and release about ____ times more heat than carbon dioxide.
The blank space in the task statement should be filled with 25 as methane can retain 25 times more heat than carbon dioxide.
Heat Retention: Methane and Carbon dioxideMethane, carbon dioxide amongst other gases are important greenhouse gases which allows the Earth retain it's heat in order for it to be habitable.
Methane can retain and release about 25 times more heat than Carbon Dioxide although Methane emissions are lower compared to Carbon Dioxide.
Read more on Greenhouse Gases:
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Which of these are functions of the female reproductive system but not the male reproductive system?Select three options.
nourishes a developing baby
produces reproductive cells
protects the developing offspring
serves as place where fertilization takes place
transports reproductive cells
Answer:
Hello! your answer is A,C, and D!
Explanation:
These are things only females would do/have, I hope I helped and good luck!
Have a wonderful day/night!
What is the limiting reactant?
3. 0.20mol AsCl, react with 0.25mol H.O
Answer:
Explanation:
0.20/4 = 0.05 for arsenic trichloide.
0.25/6 = 0.04 for water.
This means that water is the limiting reactant.
What's oxygen called in an ionic bond.
Answer: Oxide
Explanation:
What volume of 0.59 M sodium phosphate must be used to make 0.91 L of 2.45 M sodium phosphate?
V1.M1=V2.M2
V1 x 0.59 = 0.91 x 2.45
V1=3.78 L
2 Which best describes an acid?
F
A. A soapy substance that is nonreactive
with metals
B. A neutral substance made of oppositely
charged particles
C. A caustic substance that has a high
number on the pH scale
D. A sour liquid that forms gas bubbles
when mixed with copper
D. A sour liquid that forms gas bubblee when mixed with copper
What is the wavelength of a photon with an energy of 4.56 x 10-19 J?
• A. 502 nm
• B. 436 nm
C. 688 nm
D. 460 nm
Answer:
B
Explanation:
We can use Planck's equation. Recall that:
[tex]\displaystyle E = h\nu[/tex]
Where h is Planck's constant and ν is the frequency.
We also have that:
[tex]\displaystyle \lambda \nu = c[/tex]
Where c is the speed of light and λ is the wavelength. Hence:
[tex]\displaystyle \nu = \frac{c}{\lambda}[/tex]
Therefore:
[tex]\displaystyle E= h\left(\frac{c}{\lambda}\right)[/tex]
Solving for λ yields:
[tex]\displaystyle \lambda = \frac{hc}{E}[/tex]
Hence substitute. Recall that h = 6.626 × 10⁻³⁴ Js and c = 2.998 × 10⁸ m/s:
[tex]\displaystyle \begin{aligned} \lambda & = \frac{(6.626\times 10^{-34}\text{ Js})(2.998\times 10^8\text{ m/s})}{4.56\times 10^{-19} \text{ J}} \left(\frac{1\times 10^9\text{ nm}}{1\text{ m}}\right) \\ \\ & = 436\text{ nm}\end{aligned}[/tex]
In conclusion, our answer is B.
To convert liquid water into steam, you must break.
why neon is special from other chemical elements
Answer: it has full valence shells
Explanation: Hope this is it
Answer:
Neon, along with helium, argon, krypton and xenon, make up the group known as noble gases. These are the most stable and least reactive elements due to having full valence shells (the outer shell has the max number of electrons, two for helium, eight for the rest).
Explanation:
Hope it helps
PlS MARK BRAINLIEST <3
`
`
`
Tori
sneksks ansia soaks s
Answer:
hamburger
yes yes
Explanation:
none lol
What is the chemical formula of the phosphate ion?.
Answer: PO43
Explanation: The structure and formula are as follows: The chemical structure of phosphate is PO43-.
The molecular mass is 94.97 g/mol.
50 points Acids & Bases
please help me children
#1
HCl+NaOH—»H_2O+NaCl#2
KOH+HNO_3—»KNO_3+HCl#3
H_2CO_3+Mg(OH)_2—»MgCO_3+H_2O#4
Al(OH)_3+HCl—»AlCl_3+H_2Ocalculate the molar solubility of ca(oh)2 in 0.10 m ca(no3)2 (ksp= 1.3x10^-6) in pure water
Ca(OH)₂⇒ Ca²⁺ + 2OH⁻
s s 2s
Ksp = [Ca²⁺][OH⁻]²
Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻
0.1 M 0.1 0.2
Input in Ksp
1.3 x 10⁻⁶ = 0.1 . 4s²
s² = 3.25 x 10⁻⁶
s = 1.8 x 10⁻³
1.8 x 10⁻³ is the molar solubility. Solubility is the amount of a substance that can be dissolved in a liquid to form a solution.
What is solubility?Solubility is the amount of a substance that can be dissolved in a liquid to form a solution; it is typically represented as grammes of solute every litre of liquid. One fluid's (liquid or gas) solubility in another can be entire (e.g., methanol and water are completely miscible) or partial (e.g., oil and water barely mix). Generally speaking, "like dissolves like" (for instance, the aromatic hydrocarbons dissolves in one another but not in water).
A material's solubility in two solvents is measured by the distribution coefficient, which is used in some separation techniques (such as absorption and extraction). In general, as temperature rises, so do the dissolution rates of solids in liquids, while they fall as temperature rises and rise with pressure for gases.
Ca(OH)₂⇒ Ca²⁺ + 2OH⁻
s s 2s
Ksp = [Ca²⁺][OH⁻]²
Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻
0.1 M 0.1 0.2
1.3 x 10⁻⁶ = 0.1 . 4s²
s² = 3.25 x 10⁻⁶
s = 1.8 x 10⁻³
Therefore, 1.8 x 10⁻³ is the molar solubility.
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HBr+ AI(OH)3 H2O + AIBr3
When CO2 and H2O react to form H2CO3, the number of bonds broken in H2O is ____ and in CO2 is _____. one; one
CO2 and H2O react to form H2CO3 and two bonds are broken each in CO and H2O to form H2CO3.
What is chemical bonding?Chemical bonding refers to the forces of attraction which hold atoms of the same or different elements together in order to form stable compounds or molecules .
Chemical bonding may be either ionic or covalent.
The greater the number of bonds in a compound, the more stable the compound.
During chemical reactions, bonds are broken and new binds are formed.
There are two bonds each in CO2 and H2O.
This, in the reaction between CO2 and H2O react to form H2CO3, , the number of bonds broken in H2O is two and in CO2 is two.
Learn more about chemical bonding at: https://brainly.com/question/819068
Classify each substituent as ortho, para activators; ortho, para deactivators; or meta deactivators.
The activating groups are; -NH2, -NR2 > -OH, -OR> -NHCOR> -CH3. while the deactivating groups are; -NO2, -CF3> -COR, -CO2R, -SO3H > Halogens.
Electrophillic substitutionOwing to the unusual stability of the benzene ring, it does not undergo addition like other unsaturated species, rather benzene does undergo electrophillic substitution.
The substituent groups determine whether the molecule will be activated or deactivated towards electrophilic substitution, the following groups decativate benzene towards electrophilic substitution; -NO2, -CF3> -COR, -CO2R, -SO3H > Halogens. The following groups activate benzene ring towrads electrophilic substitution; -NH2, -NR2 > -OH, -OR> -NHCOR> -CH3.
Learn more about activators and decativators: https://brainly.com/question/9904853
The quantitative amount of charge separation in a diatomic molecule contributes to the dipole moment of that molecule. A. True B. False
Answer:
The answer is True.
Explanation:
The sentence above is true it all adds up.
What unusual characteristic of water gives it this relatively unique phase diagram? Explain. (Hint: think about molecular structure of solid and liquid water.)
Answer:In water's diagram, the slope of the line between the solid and liquid states is negative rather than positive. The reason is that water is an unusual substance in that its solid state is less dense than the liquid state.
Explanation:
The actual electronic structure of the molecule with individual Lewis structure resonance forms is called g
Answer:
The actual electronic structure of the molecule (the average of the resonance forms) is called a resonance hybrid of the individual resonance forms.
Explanation:
hope this help
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what mass of oxygen is produced when 1.84 mol of h2o2 decompose
What are 2 instruments used to test for conductivity
Answer:
Your answer is probe and a meter.
Explanation:
Hope it helps
Good Luck
PLEASE HELP
A scientist records measurements of very low pressure and high relative humidity at the top of a mountain. A weather map indicates that a warm front is approaching the mountain. Which conditions would the scientist most likely observe.
Question 4 options:
partly cloudy and calm
very sunny with strong wind
windy and cloudy, with rain likely
very cloudy with violent thunderstorms approaching
Why does benzilic acid only precipitate in acidic solution.
Benzilic acid will only precipitate in acidic solution to remove excess acid and restore equilibrium.
What are is chemical equilibrium?Chemical equilibrium refers to a state in which the rate at which reactant molecules combine to form products is equal to the rate at which products dissociate to form reactants.
For a reaction in equilibrium, any change to distort the equilibrium will cause equilibrium to shift to counter that change.
The components of Benzilic acid exist in equilibrium and will only precipitate in acidic solution because more acid has been added and equilibrium will shift to removal of excess acids.
Therefore, benzilic acid only precipitate in acidic solution in order to remove excess acid and restore equilibrium.
Learn more about chemical equilibrium at: https://brainly.com/question/19340344