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
Delvig [45]
3 years ago
9

What Is A Nebula?

Chemistry
2 answers:
Sonbull [250]3 years ago
7 0

a nebula is a  cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.

therfore your answer would be C  cloud of dust and gas in space

question answered by

(jacemorris04)

ludmilkaskok [199]3 years ago
6 0

The answer to your question is,

C. Cloud of dust and gas in space.

-Mabel <3

You might be interested in
Which of these reactions successfully models a nuclear fission reaction?
user100 [1]

Answer:

OPTION B

Explanation:

Nuclear "fission" is the breakdown of the nucleus of a radioactive element into two or more nuclei accompanied by the release of energy. I guess that pretty much explains it.

3 0
2 years ago
Calculate the theoretical carbonaceous and nitrogenous oxygen demand for:
serg [7]

Answer:

The correct answer is 129 mg and 232 mg.

Explanation:

Theoretical carbonaceous oxygen demand:

The reaction will be,  

C₂H₆O₂ + 5/2 O₂ ⇒ 2CO₂ + 3H₂O

Thus, for one mole of C₂H₆O₂ (ethylene glycol), 2.5 moles of O₂ is needed.  

The molecular mass of ethylene glycol is 62 grams per mole.  

The given mass of ethylene glycol is 100 mg or 0.1 grams

The moles of ethylene glycol will be,  

Moles = Weight/Molecular mass

= 0.1/62 = 1.613 × 10⁻³ mol

For 1.613 × 10⁻³ mol, the moles of O₂ will be,  

= 2.5×1.613×10⁻³

= 4.0.×10⁻³ × 32mol

= 0.129 grams or 129 mg.  

The theoretical nitrogenous oxygen demand is:  

The reaction will be,  

2NH₃-N + 9/2O₂ ⇒  4HNO2 + H₂O

Thus, for 2 moles of NH₃-N, 4.5 moles of O₂ is needed,  

Therefore, for 1 mol of NH₃-N, the oxygen required will be,  

= 4.5/2 = 2.25 mol

The given mass of NH₃-N is 100 mg, the moles of NH₃-N will be,  

Moles = 100×10⁻³/31 = 3.225 × 10⁻³ mol (The molecular mass of NH₃-N is 31 gram per mole)

The moles of O₂ is 2.25 × 3.225 × 10⁻³ = 7.258 × 10⁻³ mol.  

Now the mass of O2 will be,  

= 7.258 × 10⁻³ × 32

= 0.232 grams

= 232 mg

5 0
3 years ago
A graph of 1/[A]t vs. time will give you a straight line if the reaction is which order?
castortr0y [4]
The answer is:  "second order" .
__________________________________________________
5 0
3 years ago
Which statement is true about metals and metalloids? A. All metals and metalloids have luster. B. Metals are good conductors and
Aleks [24]
I believe the statement that is true of metals and metalloids is B. Metals are good conductors and metalloids are bad conductors.
7 0
3 years ago
Read 2 more answers
[Ar]4s23d2 is the noble gas notation for
solmaris [256]
Argon is the noble gas for titanium
3 0
3 years ago
Read 2 more answers
Other questions:
  • When bringing water to a boil in the mountains, the time needed to reach the boiling point is?
    5·1 answer
  • Citrate synthase catalyzes the reaction: ????x????????o????c???????????????????? + ????c????????y???? − ????o???? → c???????????
    13·1 answer
  • Which location represents a period on a Periodic Table?   A. a vertical row   B. a horizontal row   C. a diagonal row on the per
    15·1 answer
  • Which element would chemically react with oxygen​
    14·1 answer
  • Are compounds considered pure substances?
    8·1 answer
  • What must be true of a substance with a lot
    8·2 answers
  • How many grams of hydrogen chloride can be produced from 1g of hydrogen and 55g of chlorine? What is the limiting reactant?
    13·1 answer
  • The metric system of units is known as
    11·1 answer
  • How have organisms changed over time, according to the fossil record?​
    12·1 answer
  • 1. How much energy must be absorbed to break the bonds of the 2 molecules of HCl?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!