Chemistry High School

What is the energy of a photon that emits a light of
frequency 6.42 x 1014 Hz?
A. 4.67 x 10-19 J
B. 4.25 x 10-19
C. 3.10 x 10-19 J
D. 9.69 x 10-19 J

Answers

Answer 1

Answer:

Option B is correct [4.25 x 10-19J]

Explanation:

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What Is The Energy Of A Photon That Emits A Light Offrequency 6.42 X 1014 Hz?A. 4.67 X 10-19 JB. 4.25
Answer 2

4.78×[tex]10^{-19}[/tex] J  is the energy of a photon that emits light of

frequency 6.42 x[tex]10^{14}[/tex] Hz.

What is the frequency?

Frequency is the rate at which current changes direction per second. The energy of a single photon is given by:

E =hν

where

E is the energy

h is the Planck constant

f is the frequency of the light

The chemical equation for the energy of a photon is given by:

E =hν , where h is the Planck constant and ν is the frequency.

E =hν = 6.626×[tex]10^{-34}[/tex] Js × 7.21×[tex]10^ {14}[/tex]

[tex]s^{-1}[/tex] = 4.78 ×[tex]10^{-19}[/tex] J

Hence, 4.78×[tex]10^{-19}[/tex] J  is the energy of a photon that emits light of

frequency 6.42 x[tex]10^{14}[/tex] Hz.

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Related Questions

in order to decrease the freezing point of 500. g of water to 1.00° c how many grams of ethylene glycol (C2H602)must be added (KF=1.86°C kg solvent)

Answers

Answer:

if wrong sorry ok????

Which of the following is the best definition of a physical property?
A. Tearing paper in half.
B. Something that can be observed or measured while changing the identity of the substance.
C. The ability of something to undergo a change or reaction.
D. Something that can be observed or measured without changing the identity of the substance.

Answers

Answer:

D.Something that can be observed or measured without changing the identity of the substance.

Three Balanced equations for Ammonium salt+Alkali=Salt+water+carbon dioxide

Answers

Answer:

NH₄Cl (aq) + NaOH (aq) -> NaCl (aq) + H₂O (l) + NH₃ (g)

(NH₄)₂CO₃ (aq) + 2KOH (aq) -> K₂CO₃ (aq) + 2H₂O (l) + 2NH₃(g)

NH₄NO₃ (aq) + LiOH (aq) -> LiNO₃ (aq) + H₂O (l) + NH₃ (g)

Explanation:

The gas liberated when an alkali reacts with an ammonium salt is NH₃ (ammonia), not CO₂.

is (H) a positive or negative value

Answers

Answer:

A chemical reaction that has a positive ΔH is said to be endothermic , while a chemical reaction that has a negative ΔH is said to be exothermic . What does it mean if the ΔH of a process is positive? It means that the system in which the chemical reaction is occurring is gaining energy.

what is the purest form of iron​

Answers

Wrought iron is the purest form of iron. It contains 0.12 to 0.25% carbon and is thus the purest form of iron.
Wrought iron is the purest form of iron as it contains 0.12- 0.25% of carbon

What is the molarity of 2 moles of a compound dissolved in 4 L of water?
A. 2 M
B. 0.5 M
C. 4M
D. 1 M

Answers

Answer:

[tex]\boxed {\boxed {\sf B. \ 0.5 \ M}}[/tex]

Explanation:

Molarity is a measure of concentration in moles per liter. The formula for calculating molarity is:

[tex]molarity= \frac{moles \ of \ solute}{ liters \ of \ solution}[/tex]

There are 2 moles of a compound or the solute. There are 4 liters of water or the solution.

moles of solute= 2 mol liters of solution = 4 L

Substitute the values into the formula.

[tex]molarity = \frac{ 2 \ mol}{ 4 \ L}[/tex]

Divide.

[tex]molarity= 0.5 \ mol /L[/tex]

1 mole per liter is equal to 1 Molar, so the solution's molarity of 0.5 mol/L is equal to 0.5 M.

[tex]molarity = 0.5 \ M[/tex]

The molarity of the solution is 0.5 Molar and choice B is correct.

The lattice energy for an ionic compound cannot be measured directly but can be calculated from the Born-_____ cycle, using a series of individual steps for which all enthalpies are known except for the lattice energy. This method is an application of Hess's law which, states that the overall energy change for a process is given by the _____ of the enthalpy changes for the individual steps.

Answers

Answer:

first is HABER

second is SUM

Explanation:

pls mark brainliest

Plz help me with this question
Drawing of water molecular formulas
1.Draw molecular structure of water​

Answers

Answer:

Here is your answer. I hope it will help you .

what is the formula of water
​

Answers

Answer:

The formula of water is H20

what are your thoughts on Galileo's idea about motion? i need the answer pls​

Answers

Answer:

Galileo believed that a projectile is a combination of uniform motion in the horizontal direction and uniformly accelerated motion in the vertical direction. If it is not impeded, it will continue to move even without an applied force

breaking larger molecules into smaller molecules and carbon

Answers

Answer: catabolism

Explanation:

Catabolism refers to the set of metabolic pathways which is necessary for the breaking down of molecules into smaller units. This is then oxidized for the release of energy or can be used to perform other anabolic reactions.

Catabolism is regarded as the opposite direction of anabolism which is simply the building-up of molecules. It should be noted that anabolism and catabolism work together in every living organisms and perform functions such as the production of energy and the repair of cells.

What is Spontaneous ion

Answers

I think I found it. It was a cylinder

Blood test can be used to check a person's blood glucose and hormone levels. The tabular column given below shows the result of two blood tests carried out on three people to check their blood glucose levels. Person 1 is healthy.

A:- Compare the glucose levels of person 1 with the glucose levels of person 2 after fasting for 12 hours.

B:- Compare the glucose levels of person 3 with the glucose levels of person 1, 2 hours after drinking 75g glucose.

C:- Person 3 cannot be produce the hormone that control blood glucose levels. State the hormone that person 3 cannot produce.

( THE ORDER OF THE PHOTO IS:- person 1, and person 2, and person 3)​


Pls it is urgent

Answers

Answer:

Explanation:

1) person 2 had a slightly higher blood glucose level than person 1 after fasting 12 hrs (0.2mmols)

2) person 3 has a much higher blood glucose level than person 1 after taking glucose (5.6mmols)

3) insulin

Hurry PLEASEEE
How many grams are 1.20 x 10^°25molecules of
calcium iodide?
Please show work!:)

Answers

The answer would be 19.9

Describe how methane is
formed in terms of chemical bonding

Answers

The methane molecule is held together by the four strong C–H carbon–hydrogen covalent bonds by sharing electrons. Note that the inner shell of carbon's electrons are not shown above, only the outer shell of carbon's electrons are involved in the covalent bonding.

Why are the highest oxidation state of the transition metal stabilised in the oxide and fluoride compond?

Answers

Answer:

Following are the solution to the given question:

Explanation:

Its maximum oxidation zone is exceptionally stable and has the greatest ability to charge density, while fluoride and oxide ions are the largest particles with the largest durability of charge.

Or it might be assumed as oxygen and fluorine are the system particle atoms that have the highest electron number of metals.

How many liters are in 4.5 moles of CO2 gas at STP? Pls help :)

Answers

Answer:

Explanation:

NCO 2= 4,5

VCO2=  4,5* 22,4=100,8

Is backbonding is possible in BF4- ? If no then why?

Answers

Answer:

No, because Flourine can only form 1 bond, thus backbonding is not obtainable

the smell spreads immediately after you burn agarbatti in this example what is your condition about intermolecular force

Answers

Intermolecular force for solids is high. Whereas low in gases. The smell of agarbatti spreads immediately because the molecules of air diffuses very fastly.

Answer:

The aroma of agarbatti spreads quickly once you burn it because the particles in the agarbatti move endlessly in all directions. Both, the air and aroma, have large intermolecular forces which is why the molecules of air scatter immediately once agarbatti is burned.

question 8 chemistry help

Answers

Answer:

Sorry,I can't do this because i don't know this questions answer.

The atomic number of silicon (Si) is 14. What's the electron configuration for silicon? Question 1 options:
A) [Ar] 3p5
B) [He] 1s2 2p6
C) [Ne] 3s2 3p2
D) [He] 2s2 3p2

Answers

Answer:

D.[Ne] 3S2 3P2

Explanation:

The electron configuration for silicon is  [Ne] 3s² 3p². Hence Option (C) is correct.

What is elctronic configuration ?

Electronic configuration, also called electronic structure or electron configuration, the arrangement of electrons in orbitals around an atomic nucleus.

The electron configuration of an element describes how electrons are distributed in its atomic orbitals.

Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.

Silicon belongs to group 14th and 3rd period.Therefore, The electron configuration for silicon is  [Ne] 3s² 3p². Hence Option (C) is correct.

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Substances that contain a transition metal can be oxidizing. The greater the number of oxidation of this metal, the greater the oxidizing character of the substance. In an industrial process in which the use of an oxidizing agent is necessary, only five substances are available: CaO, FeO, Cu₂O, Cr₂O₃ and KMnO₄.


The substance that should be used in this process, as it has a greater oxidizing character, is:


a) Cr₂O₃


b) Cu₂O


c) CaO


d) FeO


e) KMnO₄

Answers

B I think that it but I don’t know

5. What change would increase the amount of gas able to be dissolved in a given amount of liquid water? (2 points)
Increasing temperature
a
Increasing pressure
Increasing surface area
O
Increasing rate of stirring

Answers

answer : increasing pressure

the amount of gas that can be dissolved in liquid water increase with the increase in pressure

Answer:

increasing pressure

Explanation:

which of the following statements is true about alkali?
A) bases that soluble in water
B) shows a pH value less than 7
C) Ionises in water to form hydroxonium ions
D) Reacts with carbonate salt to release carbon dioxide gas​

Answers

Answer:

it should be letter c

Explanation:

I hope this help

which statement is generally true about CaCaI2 ?

Answers

Explanation:

"Its bonds are formed by large differences in electronegativity" is the statement among the choices given in the question that is generally true about CaCl2.

why can't sodium salt be prepared by double decomposition
​

Answers

Normally, reacting a metal and an aqueous acid will produce a salt and hydrogen gas, as in the case of iron:

Fe(s)+2HCl(aq)⟶FeCl2(aq)+H2(g)


However, you should not use the same method to produce, for example, sodium chloride:

2Na(s)+2HCl(aq)⟶2NaCl(aq)+H2(g)

Sodium salt might not be prepared by double decomposition because the method is used in preparing insoluble salts.

What is Double decomposition method?

Double decomposition method serves as the method that is used in preparing compounds which entails reaction between two soluble compounds and after reaction soluble and insoluble products are produced.

Therefore, since most of the sodium salt are soluble salt , Double decomposition cannot be used to prepare them.

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Which statement best describes how forces are important to chemistry?
A. Forces are transferred when atoms form ions.
B. Forces are released during chemical reactions.
C. Forces determine the extent of a reaction.
D. Forces hold atoms and molecules together.

Answers

Answer:

D

Explanation:

career in chemistry list ten
​

Answers

Explanation:

Chemistry Teacher.

Chemical Engineer.

Forensic Scientist.

Geochemist.

Biochemists

Pharmacologist

Analytical Chemist

Envionmental chemist

Water Chemist

Catalysis


Analytical Chemist.
Chemical Engineer.
Chemistry Teacher.
Forensic Scientist.
Geochemist.
Hazardous Waste Chemist.
Materials Scientist.
Pharmacologist.

Patience, a popular card game in Mendeleev's time, is also known as Go Fish.
A. True
B. False

Answers

Answer:

B. False

Explanation:

step by step explanation

Answer:

False

Explanation:

what is meant by reactive elements​

Answers

Answer; relative elements are most reactive elements and compounds may ignite spontaneously or explosively. They generally burn in water as well as the oxygen in the air

Explanation:

Answer:

Reactive elements are the  elements which are ready to gain electrons because they have  incompletely filled outermost shell.

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