1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Evgesh-ka [11]
3 years ago
15

Please help me with my hw fast

Chemistry
2 answers:
algol133 years ago
7 0
<h3><u>Answer</u>;</h3>

548 kJ

<h3><u>Explanation and solution</u>;</h3>

The energy in joules of a single photon of wavelength λ in meters is:  

E = hc/λ , where h is the planks constant, 6.63x10^-34 J·s, c is the speed of light, 3x10^8 m/s and λ is the wavelength in meters.

   = (6.63x10^-34 J·s) (3x10^8 m/s) / (655 nm) (1x10^-9 m/nm)

   = 3.03x10^-19 J.  

The energy in kilojoules of 3 moles of photons of this wavelength is:  

    = (3.03x10^-19 J) (6.02x10^23 /mol) (3.0 mol) / (1000 J/kJ)

     = 548 kJ.

tatyana61 [14]3 years ago
4 0

Answer is cool than your answer kid

You might be interested in
Changing the number of _____ would change an atom into an atom of a different element. changing the number of _____ would change
AURORKA [14]
Answer: Protons

WHY?
Changing electrons will only result in the same element having different charges and hence, changing it's chemical properties.

Changing neutrons will not change an element but it will result in an isotope forming instead. (Isotopes are elements of the same type with different neutron numbers.)

However, changing the proton number would immediately change the nucleus composition, resulting in a change in element with a negative charge as there are more electrons than protons. This results in a expansion in valance electrons's distance from the nucleus. This results in a change in chemical properties of the element.

Therefore, a change in Protons is the answer.
4 0
3 years ago
The question is in the picture below.
pantera1 [17]
The correct option is A.
An oxidation reaction is one in which a substance gives away electrons and becomes oxidized. In the equation given above, the chlorate ion undergoes oxidation reaction and gives away two chlorine ion.
4 0
4 years ago
The rate constant for a certain reaction is k = 6.50×10−3 s−1 . If the initial reactant concentration was 0.600 M, what will the
Kamila [148]

Answer: 1.037M

Explanation:

Since the rate constant unit is per seconds, therefore it is a first order reaction.

First order reaction equation is given as

InA= -kt +InAo

Where,Ao is the initial concentration of reactant =0.600M

A is the concentration of reactant at a specifies time t=3×60=180s

and k is the rate constant

InA = -6.50×10^-3 ×180 +In(0.6)

InA = -1.17 + 0.5108

InA= -1.680

A = e-1.680

A= 1.037M

Therefore the concentration after 3minutes is 1.037M

6 0
4 years ago
What are the rows of the periodic table called?
Arlecino [84]

Answer:

i believe its called A. periods

4 0
2 years ago
Why is NaHCO3 a base?
worty [1.4K]

NaHCO3 is a product of a strong base and a weak acid reaction. Thus it has weak basic properties.

HCO3- ion is actually amphoteric, which means it can act as a base or an acid. But it is weaker than a strong acid or a strong base.

<span>HCO3- is amphoteric meaning it acts both as a B.L. Acid and a B.L. Base.. which is why it's used to neutralize both acid and base spills in the lab.</span>

7 0
3 years ago
Other questions:
  • What is the organelle that packages and releases materials other parts of the cell?
    9·1 answer
  • Which of these items best describes the arrangement of electrons in an atom of sulfur? A. Two electrons in its first energy leve
    15·1 answer
  • When steam is passed through red hot coke, a mixture of two gases is formed. Explain with reaction​
    10·1 answer
  • Suggest two reasons why the maximum allowed percentage of carbon monoxide
    10·1 answer
  • What is a semiconductor
    5·2 answers
  • How many protons, neutrons, and electrons does 35/17 Cl ^ 1- have?
    11·1 answer
  • Which compound is insoluble in water?
    14·2 answers
  • Help me please TwT. I really need it TwT
    7·1 answer
  • Ii. FILL IN THE BLANK
    11·1 answer
  • What cell structure is best represented by the image?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!