Answer:
10.9 * 10^-7 m
Explanation:
We know that the Rydberg constant (R) is – 13.6 eV = -2.18 * 10^-18 J
ΔE= -R(1/nf - 1/ni)
Where;
nf = final state
ni= initial state
ΔE= -2.18 * 10^-18(1/3 - 1/4)
ΔE= -2.18 * 10^-18(1/12)
ΔE= -1.81 * 10^-19 J
From;
ΔE=hc/λ
h = plank's constant = 6.6 * 10^-34 Js
c = 3 * 10^8 ms-1
λ = ?
λ = hc/ΔE
λ = 6.6 * 10^-34 * 3 * 10^8/ 1.81 * 10^-19
λ = 10.9 * 10^-7 m
A 283.3-g sample of X2(g) has a volume of 30 L at 3.2 atm and 27 'C. What is element X?
we find the number of moles with the formula
pV=nRT
27C=300k
3.2*30=n*0.082*300
n=96/24.6=3.9 moles
we have the mass ant the number of moles so we can calculate the molar mass
283.3/3.9=72.64g/moles
that means X's mass is 72.64/2=36.3 so the element is Kr(Kriptonium)
what is the meaning of the word hydrocarbons
Answer:
An organic compound (such as acetylene or butane) containing only carbon and hydrogen and often occurring in petroleum, natural gas, coal, and bitumens.
Explanation:
Iooked it up
What is electronegativity
Answer:
Electronegativity, symbol χ, measures the tendency of an atom to attract a shared pair of electrons (or electron density). An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus. The higher the associated electronegativity, the more an atom or a substituent group attracts electrons.
Ren runs a hamburger stand and needs to clean up a season’s worth of grease buildup on the range hood over his griddle. Explain what he should look for in a cleaning product that can handle a layer of grease.
Answer:
A simple mix of baking soda, kosher salt, and dish soap
Explanation:
I don't know why you would need to know this but the stuff mentioned above should get rid of the grease
Answer:
Sample Response for Edge2021: Ren should use a cleaning product that contains a base. This is because bases readily react with lipids, the kind of compound that makes up grease. A base would break down the grease, forming soap, which would then easily wash away.
Explanation:
I want a Huge conversation about planets (kid friendly)
Answer:
Plants are made of gas and mass
Answer:
hello again :-)))))))
You are comparing a reaction that produces a chemical change and one that prouduces a physical change. What evidence could you use to determine wich type of change is occurring?
Answer: If the reaction is a chemical change, new substances with different properties and identities are formed. This may be indicated by the production of an odor, a change in color or energy, or the formation of a solid.
hope it helps!!
write down any four uses of solution
.I will mark him\her as brilliant
Answer:
because it will help u
because it will make u to understand the question very well
Show Work
1. If you were to combine hydrogen with 80.0 g of oxygen, how much hydrogen would
you need to completely react with all of the oxygen?
2. Suppose sodium and chlorine form a compound in the ratio of 1.54 g chlorine to
1.0 g sodium. How much sodium would be needed to completely react with 45.0
of chlorine?
Answer:
Mass of hydrogen needed = 10 g
29.22 gram of sodium are required
Explanation:
1 )Given data:
Mass of oxygen = 80.0 g
Mass of hydrogen needed = ?
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 80 g/ 32 g/mol
Number of moles = 2.5 mol
now we will compare the moles of oxygen and hydrogen.
O₂ : H₂
1 : 2
2.5 : 2× 2.5 = 5 mol
Mass of hydrogen:
Mass = number of moles × molar mass
Mass = 5 mol × 2 g/mol
Mass = 10 g
2 : Given data:
initial mass ration of chlorine and sodium react with each other = 1.54 g : 1.0 g
Mass of sodium required for 45 g of chlorine = ?
Solution:
Cl₂ : Na
1.54 : 1.0
45 : 1.0/1.54× 45 = 29.22 g
Thus, 29.22 gram of sodium are required.
Fill in the coefficients that will balance the following reaction: (Note: Use 1 as coefficient where appropriate.) NaCl + CaS → Na2S + CaCl2
Answer:
the answer is
2,1,1,1
Explanation:
Valence electrons are determined by the...
a. highest occupied energy level and Group Number. I
b. highest occupied energy level and Group Number - 8.
Explanation:
A) Highest occupied energy level and Group Number.
1. How many elements within the periodic table are classified as
nonmetals?
A. 10
B. 15
C. 21
D. 28
Answer:
it is actually 17 but the closest would be 15.
B. 15
please help me i will give brain list
a)CH3-CH2-CH2-CH=CH2
b)CH3-CH2-CH2-CH2-CH2-CH2-CH3
c)CH≡C-CH2-CH2-CH2-CH3
d)CH3-CH2-CH2-CH2-CH2-CH2-CH=CH2
e)CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH3
give me brain list
Explain in brief how the non-covalent weak interactions play a major role in biomolecular structure.
Answer:
See explanation
Explanation:
Many bimolecuar structures are formed by non-covalent interactions such as hydrogen bonding.
A typical example that comes in handy here is the bimolecular structure of acetic acid. In the structure of acetic acid, we notice that the molecule exists as dimmers. This dimmeric structure accounts for its high boiling point.
The dimmeric structure stems from non-covalent hydrogen bonded interaction between acetic acid molecules as shown in the image attached.
heyyy Powerpuff girls! what advantage does globe maps have over a flat map?
Answer:
The advantage of the globe is that it promotes visual accuracy. Students need to use a globe frequently if they are to form accurate mental maps. The advantage of the world map is that you can see the entire world at one time. The disadvantage is that world maps distort shape, size, distance, and direction.
Explanation:
miss girl- you could've just looked this up
(just make it look like you typed it)
Answer:
The advantage of the globe is that it promotes visual accuracy. Students need to use a globe frequently if they are to form accurate mental maps. The advantage of the world map is that you can see the entire world at one time. The disadvantage is that world maps distort shape, size, distance, and direction.
Friend?
Which pair of dispersed phases and dispersing media can never form a colloid?
Select one:
O a. solid and gas
O b. liquid and gas
O c. solid and solid
O d. liquid and liquid
O e. gas and gas
Answer:
Option B Liquid and Gas
The boiling point of CH3OCH3 would be________ the boiling point of CH3CH2OH.
A)lower than
B) equal to
C) higher than
can someone explain this please?
Answer:
A. Lower than
describe the effect of subjecting hydrogen to pressure
Answer:
When hydrogen is subjected to large enough pressure, it solidifies according to theory.
Explanation:
According to theory, when hydrogen molecules are subjected to enormous degree of pressure the molecules will solidify.
What happens here is that the hydrogen–hydrogen bonds in the hydrogen molecule will break apart and the molecules collapses into hydrogen atoms.
Hence, when hydrogen is subjected to large enough pressure, it solidifies according to theory.
Atoms of the same element with a
different number of neutrons
are called______________
when a neutral atom gains or loses
electrons, it becomes charged
and is called ain)!______________
Answer:
isotopes for the first blank space
Acetylene C2H2 gas is often used in welding torches because of the very high heat produced when it reacts with oxygen O2 gas, producing carbon dioxide gas and water vapor. Calculate the moles of carbon dioxide produced by the reaction of 1.60mol of acetylene. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits.
Answer:
3.20 moles of carbon dioxide
Explanation:
The reaction of C₂H₂ with O₂ is:
C₂H₂ + 5/2O₂ → 2CO₂ + H₂O
Where 1 mole of acetylene produce 2 moles of carbon dioxide.
Based on the chemical equation of this reaction, there are produced twice the moles of acetylene in moles of carbon dioxide assuming a compete reaction.
If 1.60 moles of acetylene reacts there are produced:
1.60 moles * 2 =
3.20 moles of carbon dioxideHow many moles are in 347 grams of HBr
Answer:
4.289 mol
Explanation:
Given that the molar mass of HBr (known as Hydrobromic Acid or Hydrogen Bromide) has a molar mass of 80.91 g/mol.
To find the number of moles, we have the formula
(Grams of the substance ÷ moles of the substance) * (molar mass of the substance in grams ÷ one mol)
Here the Grams of the substance = 347grams,
Moles of the substance =?
Molar mass of the substance = 80.91 g/mol
By cross multiplying, we have
347 grams * 1 mol = Z * (80.91)
Z = 347 grams ÷ 80.91g/mol
Z = 4.289 mol
What is the rate constant of a reaction if rate = 1 x 10-2 (mol/L)/s, [A] is 2 M,
[B] is 3 M, m = 2, and n = 1?
k=
rate/[A]" [B]"
The rate constant of a reaction : 8.3 x 10⁻⁴
Further explanationGiven
rate = 1 x 10⁻² (mol/L)/s, [A] is 2 M, [B] is 3 M, m = 2, and n = 1
Required
the rate constant
Solution
For aA + bB ⇒ C + D
Reaction rate can be formulated:
[tex]\large{\boxed{\boxed{\bold{r~=~k.[A]^a[B]^b}}}[/tex]
the rate constant : k =
[tex]\tt k=\dfrac{rate}{[A]^m[B]^n}\\\\k=\dfrac{1.10^{-2}}{2^2\times 3^1}\\\\k=8.3\times 10^{-4}[/tex]
Answer:
8.3x10^10-4
Explanation:
a p e x
Rank the following in terms of increasing boiling point:_______. CH3CH2OCH2CH3 CH3CH2OCH3 CH3CH2CH2CH3 CH3CH2CH2CH2NH2 a. CH3CH2CH2CH2NH2 < CH3CH2CH2CH3 < CH3CH2OCH3 < CH3CH2OCH2CH3 b. CH3CH2CH2CH3 < CH3CH2OCH2CH3 < CH3CH2OCH3 < CH3CH2CH2CH2NH2 c. CH3CH2OCH3 < CH3CH2CH2CH3 < CH3CH2OCH2CH3 < CH3CH2CH2CH2NH2 d. CH3CH2CH2CH2NH2 < CH3CH2OCH2CH3 < CH3CH2OCH3 < CH3CH2CH2CH3 e. CH3CH2CH2CH3< CH3CH2OCH3< CH3CH2OCH2CH3< CH3CH2CH2CH2NH2
Answer:
CH3CH2CH2CH3 <CH3CH2OCH3<CH3CH2OCH2CH3< CH3CH2CH2CH2NH2
Explanation:
Some important factors affect the boiling point of aliphatic compounds. Prominent among them are;
1) relative molecular mass
2) nature of intermolecular
3) surface area of compound.
In this case, the nature of intermolecular forces and the molecular mass of the compounds are worthy of mention.
The degree of dipole interaction in CH3CH2CH2CH2NH2 is far greater than that in the ethers hence the amine has the highest boiling point followed by the ether of higher molecular mass then the ether of lower molecular mass and finally the alkane has the lowest boiling point because only dispersion forces are involved.
The correct ranking of the given organic compounds from highest to lowest boiling points is given by;
Option D; CH3CH2CH2CH2NH2 < CH3CH2OCH2CH3 < CH3CH2OCH3 < CH3CH2CH2CH3
We are given the organic compounds;
CH3CH2OCH2CH3
CH3CH2OCH3
CH3CH2CH2CH3
CH3CH2CH2CH2NH2
The family names of the given organic compounds are;
CH3CH2OCH2CH3 is an ether
CH3CH2OCH3 is an ether
CH3CH2CH2CH3 is an alkane
CH3CH2CH2CH2NH2 is an amine
The boiling points are given in the order from highest to lowest as;
Alkanes < Ethers < Amines
This is because Amines have higher possibility of hydrogen bonding than the others.
Lastly, a longer chain ether will have a higher boiling point than the shorter chain one because it can have more Vander walls force interactions.
Thus, the correct order of arrangement of the given organic compounds from highest to lowest boiling point is;
CH3CH2CH2CH2NH2 > CH3CH2OCH2CH3 > CH3CH2OCH3 > CH3CH2CH2CH3
Read more about ranking of organic compounds according to boiling points at; https://brainly.com/question/13708633
what is the mass in grams of 9.3 moles of C2H4
Answer:
18.6 ( had to be 20 letter :/)
Explanation:
describe manganese as oxidizing agent
Answer:
See explanation
Explanation:
A reducing agent in chemistry is any substance that accepts electrons and its oxidation number is decreased in a redox reaction.
Manganese occurs in a variety of oxidation states; +7, +6, +5, +4, +3, +2. This makes it an exceptionally good reducing agent since it can accept different number of electrons and change from one oxidation state to another.
The commonest compound of manganese used as a strong oxidizing agent is KMnO4 in which manganese has an oxidation number of +7.
What kind of solution would you have if it contained 50 grams of sodium chloride in 100 mL of water at 30˚C?
Answer:
Supersaturated solution.
Explanation:
Hello!
In this case, according to the types of solution in terms of the relative amounts of solute and solvent, we can define a point called solubility at which the amount of solute is no longer dissolved in the solvent; thus, a value of solute/solvent less than the solubility is related to unsaturated solutions, equal to the solubility is related to the saturated solutions and more than the solubility to supersaturated solutions.
Thus, since solubility is temperature-dependent, at 30 °C the solubility of sodium chloride is 36.09 g per 100 mL of water; which means that, since the solution has 50 g of sodium chloride, more than 36.09 g, we infer this is a supersaturated solution.
Best regards!
In the Lewis structure of BF3, how many lone pairs surround the boron atom?
NEED ASAP
Select one:
a. 0
b. 1
c. 2
d. 3
We can see here that the number of lone pairs surround the boron atom is A. 0.
What is a boron atom?A boron atom is an atom of the chemical element boron, which is represented by the symbol B in the periodic table. Boron is a metalloid with atomic number 5, meaning it has five protons in its nucleus. It belongs to Group 13 (formerly known as Group IIIA) of the periodic table and is located in period 2.
The Lewis structure of [tex]BF_{3}[/tex] indicates that boron (B) forms three single bonds with three fluorine (F) atoms. Each bond consists of a pair of electrons shared between boron and fluorine. Since there are no unshared electron pairs around the boron atom, the answer is option a. 0.
Learn more about boron atom on https://brainly.com/question/864236
#SPJ6
How many valence electrons does selenium have?
Answer:
six electrons
Explanation:
The six electrons in the outermost shell allow selenium to have a variety of valence numbers. Selenium compounds have been found that have valences of -2, 4, and 6. Speaking of the number six, selenium is found to have six naturally occurring isotopes.
Which variable increases when potential energy increases?
Answer:
Height and mass
Explanation:
The potential energy of a body is the energy due to the position of a body.
It is mathematically expressed as:
Potential energy = m g h
m is the mass of the body
g is the acceleration due to gravity
h is the height of the body
Acceleration due to gravity on the earth surface is a constant.
As mass and height of a body increases, the acceleration due to gravity will also increase.
How do fossils provide evidence that evolution has happened on Earth?
Answer:
i dunno
Explanation:
Answer:
Explanation:
Evidence for early forms of life comes from fossils. By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. There are gaps in the fossil record because many early forms of life were soft-bodied, which means that they have left few traces behind.
CHEMISTRY HELP!
Can anyone help me understand or explain why my answer was wrong and why the correct answer is right? Please help!
Answer:
Li to Zn2+
Explanation:
Because oxidation number of Li changes from 0 to 2+ it means that Li has lost two electrons and oxidation number of Zn2+ changes to Zn which means Zn received two electrons.