Answer:
2.40 × 10² nm.
Explanation:
We are given that the the first ionization of a sodium atom is 5.00 × 10² kJ/mol and we want to determine the wavelength of light (in nm) that is sufficient to ionize a sodium atom.
We will first find the ionization energy required for one sodium atom using molar conversions:
[tex]\displaystyle 1 \text{ atom Na} \cdot \frac{5.00 \times 10^2\text{ kJ}}{\text{mol Na}} \cdot \frac{1\text{ mol Na}}{6.02\times 10^{23} \text{ atom Na}} = 8.31 \times 10^{-22} \text{ kJ}[/tex]
From the formula:
[tex]\displaystyle E = hv[/tex]
Where h is Planck's constant, substitute and solve for frequency v:
[tex]\displaystyle \begin{aligned} \left(8.31 \times 10^{-22} \text{ kJ}\right) &= (6.626\times 10^{-34} \text{J$\cdot$s})\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right) v \\ \\ v & = 1.25\times 10^{15} \text{ s}^{-1}\end{aligned}[/tex]
From the relationship between frequency and wavelength, solve for wavelength:
[tex]\displaystyle \begin{aligned} c & = \lambda\nu \\ \\ \lambda & = \frac{c}{v} \\ \\ & = \frac{(3.00 \times 10^8 \text{ ms}^{-1})}{(1.25 \times 10^{15}\text{ s}^{-1})}\cdot \left( \frac{1\times 10^9\text{ nm}}{1 \text{ m}}\right)\\ \\ &=2.40\times 10^2 \text{ nm} \end{aligned}[/tex]
In conclusion, the wavelength of light necessary to ionize a sodium ion is about 2.40 × 10² nm.
Following embalming an area of skin slip would be
Answer:
dry with some fluid
Explanation:
Complete the sentence.
Atoms form chemical bonds to satisfy the ___________rule and to become _______.
Answer:
Atoms form chemical bonds to satisfy the octet rule and to become stable.
Explain the second law of thermodynamic
About:
Explain the second law of thermodynamic
Answer:
The second law of thermodynamics is the law of physics which states that it is impossible to construct a heat engine operating in a cycle that solely converts the heat energy obtained from a reservoir at a certain temperature into mechanical work entirely.
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[tex] \green{ \boxed{ \boxed{ \sf{Lusi \: Adriana} } } } [/tex]
Hope it is useful...What would be the bond order for He 2 2- molecule
Answer:
In He2 molecule,
Atomic orbitals available for making Molecular Orbitals are 1s from each Helium. And total number of electrons available are 4.
Molecular Orbitals thus formed are:€1s2€*1s2
It means 2 electrons are in bonding molecular orbitals and 2 are in antibonding molecular orbitals .
Bond Order =Electrons in bonding molecular orbitals - electrons in antibonding molecular orbitals /2
Bond Order =Nb-Na/2
Bond Order =2-2/2=0
Since the bond order is zero so that He2 molecule does not exist.
Explanation:
What is the potential energy of 25kg rock sitting on the cliff with a height of 230m?
Answer:
57,500 JExplanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 10 m/s²
From the question we have
PE = 25 × 10 × 230 = 57,500
We have the final answer as
57,500 JHope this helps you
One tablespoon of cookie dough has a mass of 12.99 g
. It is combusted in a calorimeter whose heat capacity is 72.49 kJ/∘C
. The temperature of the calorimeter rises from 21.84 ∘C
to 25.23 ∘C
. Find the food caloric content of the cookie dough in Calories per gram
The calorific value of the tablespoon of cookie dough is 58.7 Calories per gram.
We have the following information from the question;
Mass of the cookie dough = 12.99 g
Heat capacity of the calorimeter = 72.49 kJ/∘C
Temperature rise = 25.23 ∘C - 21.84 ∘C = 3.39∘C
H = 12.99 g × 72.49 × 10^3J/∘C × 3.39∘C
H = 3.19 × 10^6 J or 762.4 Cal
1 g produces 762.4 Cal/ 12.99 g = 58.7 Calories per gram
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please help
Why is there less air pressure at higher altitudes?
Air at higher altitudes is cooler and less turbulent.
Lighter air molecules float above heavier air molecules.
The warmer, lighter air rises, bringing cooler, heavier air to low altitudes.
Air at higher altitudes doesn't have as much air weighing down on it from above.
Answer:
The warmer, lighter air rises, bringing cooler, heavier air to low altitudes.
Air at higher altitudes doesn't have as much air weighing down on it from above.
Explanation:
In short - air pressure is the result of the cumulative force that air molecules act on objects below them due to Earth's gravity. The higher the altitude, the less air molecules there are to act a force below them, and therefore, there's less air pressure at higher altitudes.
Answer:
I believe it's the second option "Lighter air molecules float above heavier air molecules
Explanation:
I believe this because as altitude increases the amount of gas molecules decrease which makes the air less dense
Atoms cannot be split up into anything smaller.
ANSWER :
A :They can be split into smaller pieces…it’s called a nuclear reaction.
B : Atoms cannot be created nor destroyed, and they are indestructible; they cannot be broken into smaller parts. This was based on the Law of Conservation of Mass.
IM SO CONFUSED RN WHICH IS CORRECT ANYONE SMART PLEASE HELP I GIVE BRAINLIEST
Answer:
A because nuclear reaction i think lol
Explanation:
Marking as brainliest!
Answer:
??????
Explanation:
Which process represents chemical weathering?
Process A: Waves in a River lift rocks which crash down to the river bed and break
Process B: Water in the cracks of rocks freezes and breaks open the rocks
Process C: An organic acid produced by rotting vegetation makes holes in rocks
Process D: Roots of plants push against rocks and make cracks in them
Answer:
The answer is Process B
Explanation:
the process B represents chemical weathering
2
The factors
on which
electronegativity depends
Upon
How would you determine whether or not your precipitate was pure?
Explanation:
All precipitation gravimetric analyses share two important attributes. First, the precipitate must be of low solubility, of high purity, and of known composition if its mass is to reflect accurately the analyte's mass. Second, it must be easy to separate the precipitate from the reaction mixture.
how many particles does one mole of sodium nitrate contain?
Hint: A mole is the entity that denotes 6.022×1023 particles.
7. What specific information about the atomic structure do the periods and groups give you?
Periods tell you...
Groups tell you...
Considering the definition of period, group and electronic configuration:
Periods tell you the energy level.Groups tell you number of electrons in the last occupied level or valence shell.The elements are arranged in horizontal rows, called periods, and in columns, called groups.
The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).
There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level.
Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f.
The placement of the elements in the periodic table is done taking into account the electronic configuration.
In each period, the elements whose last level of their electronic configuration coincides with the number of the period appear.
On the other hand, in each group appear the elements that present the same number of electrons in the last occupied level or valence shell.
In summary:
Periods tell you the energy level.Groups tell you number of electrons in the last occupied level or valence shell.Learn more:
brainly.com/question/19710066?referrer=searchResults brainly.com/question/20985070?referrer=searchResults brainly.com/question/13980678?referrer=searchResults brainly.com/question/8140611?referrer=searchResults brainly.com/question/21267620?referrer=searchResults brainly.com/question/8001694?referrer=searchResultsWrite the complete ground-state electron configuration of B^3+
No links please!
Answer:
Explanation:
[He] 2s2 2p1
Cấu hình electron nguyên tử của nitơ là
Answer:
1s2 2s2 2p3
Explanation:
In an atom, what is the maximum number of electrons that can have a principal quantum number n = 4?
Answer:
32
Explanation:
Principal quantum number=n=4
Maximum number of electrons:-
[tex]\\ \sf\longmapsto 2n^2[/tex]
[tex]\\ \sf\longmapsto 2(4)^2[/tex]
[tex]\\ \sf\longmapsto 2(16)[/tex]
[tex]\\ \sf\longmapsto 32[/tex]
Filtration is useful for separating
Answer:
insoluble solid from a liquid.
Answer:
Preparing coffee and tea
Explanation:
86-proof bourbon has a molarity of 7.4 M ethanol, C2H5OH. Determine the number of millimoles of ethanol in a 750 mL bottle.
Answer:
Molarity of ETHL in a 750 ML bottle is 43777.5
Explanation:
Because 1 mole of ETHL is 58.37ML multiply it by 750ML
(WILL GIVE BRAINIEST)
If you toast a piece of bread then spread butter onto the warm plece of toast, what would be the physical change occurring? What would be the chemical change occurring?
Answer:
I say both I hope this helps
What is evidence?
A. A type of package
B. An expert on a topic
C. A claim made by a product
D. Data that support a hypothesis
Answer:
D. Data that support a hypothosis
Explanation:
Evidence needs to support a claim
Answer:
data that support a hypothesis
For this molecule: C C CH3 CH3 H3C H3C what would be the expected hybridization, regions of high electron density and bond angle of either central carbon
The bond angle around each central carbon atom is 120°and they are both sp2 hybridized having three regions of electron density.
We can see that the two central carbon atoms have a double bond to each other. A double bonded specie is sp2 hybridized. This implies that the two central carbon atoms are sp2 hybridized.
Also, there are three regions of electron density around each of the two central carbon atoms because each is bonded to three atoms respectively. The bond angle of each central atom is 120°.
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Calculate the mass of water produced when 2.65 g of butane reacts with excess oxygen.
Answer:The reaction of butane with sufficient/excess oxygen is as follows:
2C₄H₁₀ + 13O₂ ⇒ 8CO₂ + 10H₂O
To work out how much water is produced, we first need to convert 2.64g of butane to moles by dividing it by butane's molecular mass, which is 58g/mol. From this we can see that we have roughly 0.045mol of butane. Since 0.045 is 0.022 of 2, we multiply this to get 0.22mol of water produced. The last thing to do is to multiply this by 18g (the molecular mass of water) to get 3.96g of water produced.
Explanation:
Which of the following is a physical property of water?
O À
It is a liquid.
OB.
It reacts with many substances.
OC.
both of the above
What is the symbol of the new atom?
Also, is the atomic number 86?
Answer:
Rn
Explanation:
Rn is the symbol for radon with the atomic number of 86
why is it difficult to measure the mass of an atom?
Answer:
It's difficult to measure the mass of an atom because they are simply so tiny. It's not like we can just put it on a weighing scale, as it wouldn't show up at all
Answer:
Because atoms are much too small to measure individually and do not have charges, there is no convenient way to accurately measure absolute atomic masses.
Ammonia is made up of nitrogen and hydrogen. Nitrogen is in Group 15 of the periodic table, and hydrogen is in Group 1. Which statement about the bonds in a molecule of ammonia is correct?
Each nitrogen atom is bonded to two hydrogen atoms.
Each hydrogen atom is bonded to two nitrogen atoms.
Each nitrogen atom is bonded to three hydrogen atoms.
Each hydrogen atom is bonded to three nitrogen atoms.
In ammonia, each nitrogen atom is bonded to three hydrogen atoms.
The groups in the periodic table contain elements that share the same chemical reactivity while elements in the same period only have the same total number of shells.
Nitrogen is in group 15 while hydrogen is in group 1. In ammonia, each nitrogen atom shares three electrons with hydrogen atoms. Hence in ammonia, each nitrogen atom is bonded to three hydrogen atoms.
Learn more: https://brainly.com/question/865531
Lab: Thermal energy transfer
Answer:Thermal energy transfer involves the transfer of internal energy.
Explanation:
Three types of thermal energy transfer are conduction, convection and radiation.
If you have a 200kg man and a 50 kg little girl standing at the top of a diving platform that is 8 ft. above a pool. Which person would have more potential energy? Explain why.
Answer:the 50 kg girl because she is 1/4th of the weight of the 200 kg man which would fall down faster causing him to have more kinetic energy and the little girl would have more more potential energy
Explanation: because in different …and ur stuck on question 10 of unit 4 guided notes
PLEASE HELP ASAP I NEED HEP PLEASE ITS DUE TODAY
(May not be 100% correct as there may be more context, but I hope this helps! Have a nice day!)
We can tell it won't be Claim 1 as Claim 1 compares a reddish-brown substance to a gray/white substance.
I am going to go with Claim 3 is most supported by the evidence because of the three descriptions of the different substances, none of them match.
