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
atroni [7]
3 years ago
8

What are some observable indications that a chemical reaction has occurred?

Chemistry
1 answer:
Leya [2.2K]3 years ago
8 0
Bubbles, release of gas, change in color, release of a smell, change in temperature, formation of a precipitate, 
You might be interested in
What are the protons neutrons and electrons of Vanadium-52 +3 charge<br> HELP
Alex17521 [72]

Answer:

Protons: 23

Neutrons: 28

Electrons: 23

I THINK

Explanation:

4 0
3 years ago
Calculate the energy change when an electron moves from n=5 to n=7. Explain/show work please.
Korolek [52]

Answer: E = 1.55 ⋅ 10 − 19 J

Explanation:  

The energy transition will be equal to  1.55 ⋅ 10 − 1 J .  

So, you know your energy levels to be n = 5 and n = 3. Rydberg's equation will allow you calculate the wavelength of the photon emitted by the electron during this transition

1 λ  = R ⋅ ( 1 n 2 final  − 1 n 2 initial  ) , where λ - the wavelength of the emitted photon; R

- Rydberg's constant -  1.0974 ⋅ 10 7 m − 1 ; n final - the final energy level - in your case equal to 3; n initial - the initial energy level - in your case equal to 5. So, you've got all you need to solve for  λ , so 1 λ  =

1.0974 ⋅10  7 m − 1 ⋅ (....     −152    

)

1

λ

=

0.07804

⋅

10

7

m

−

1

⇒

λ

=

1.28

⋅

10

−

6

m

Since  

E

=

h

c

λ

, to calculate for the energy of this transition you'll have to multiply Rydberg's equation by  

h

⋅

c

, where

h

- Planck's constant -  

6.626

⋅

10

−

34

J

⋅

s

c

- the speed of light -  

299,792,458 m/s

So, the transition energy for your particular transition (which is part of the Paschen Series) is  

E

=

6.626

⋅

10

−

34

J

⋅

s

⋅

299,792,458

m/s

1.28

⋅

10

−

6

m

E

=

1.55

⋅

10

−

19

J

8 0
3 years ago
Paano mag ka jowa? any suggestions?​
melamori03 [73]

Well just wait for the right time to come, Because if you wait for the right time, you're gonna find someone who you really want- I'm bad at understanding tagalog

6 0
3 years ago
Read 2 more answers
The water that moves over the land is and carries particales is a called a
yulyashka [42]
It is called a runoff
3 0
3 years ago
Three dimensional scale model of the Earth
Likurg_2 [28]
A globe , a sphere could be used as a three dimensional mode of the earth as well.
6 0
3 years ago
Other questions:
  • Which property is true for metals?
    15·2 answers
  • How many Al atoms are present in 2.5 moles of Al2O3
    5·1 answer
  • Which of the following aqueous solutions are good buffer systems? . a. 0.12 M calcium hydroxide + 0.29 M calcium bromide . b. 0.
    15·1 answer
  • Which of the following numbers will produce the same number when rounded to two significant figures? (2.3)
    14·1 answer
  • Please help, I really don’t understand this!!!
    14·1 answer
  • Which uses of iron are due to its chemical properties? Select two options.
    7·2 answers
  • What does the 32.06 represent?
    12·1 answer
  • How many phosphorus atoms are represented in the formula?
    5·2 answers
  • "How many grams of CaCl2 would be dissolved in 1.0 L of a 0.10 M solution of CaCl2? "
    10·1 answer
  • Give one use of magnesium chloride
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!