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
Leviafan [203]
3 years ago
12

In 450 BCE, Greek philosopher Democritus first thought of the existence

Chemistry
1 answer:
trasher [3.6K]3 years ago
3 0

Answer:

A. Invisible

Explanation:

You might be interested in
Due to the small and highly electronegative nature of fluorine, the oxyacids of the this element are much less common and less s
Molodets [167]

Answer:

HOFO = (0, 0, +1, -1)

Explanation:

The formal charge (FC) can be calculated using the following equation:

FC = V - N - \frac{1}{2}B

<u>Where:</u>

V: are the valence electrons

N: are the nonbonding electrons

B: are the bonding electrons

The arrange of the atoms in the oxyacid is:

H - O₁ - F - O₂

Hence, the formal charge (FC) on each of the atoms is:

H: FC = 1 - 0 - 1/2*(2) = 0            

O₁: FC = 6 - 4 - 1/2*(4) = 0        

F: FC = 7 - 4 - 1/2*(4) = +1

O₂: FC =  6 - 6 - 1/2*(2) = -1

We can see that the negative charge is in the oxygen instead of the most electronegative element, which is the F. This oxyacid is atypical.  

I hope it helps you!

3 0
3 years ago
Answer my my science homework please
ludmilkaskok [199]
1. D

2. <span>83.5 million years ago - 66 million years ago

3. </span><span>It had armor and could rotate to keep its caudal bludgeon facing the enemy.

hope this helped :)
alisa202</span>
5 0
3 years ago
What system is responsible for transporting food, waste, and gases throughout the body?
Tju [1.3M]
Digestive I think, that transfers food.
4 0
3 years ago
PLEASE HELP, THIS IS TIMED!!!!!!!!!!!!!!!!!!!!!!!!!!Convert 22.6g AgNO3 to moles.
andreev551 [17]

Answer:

the answer b because

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles AgNO3, or 169.8731 grams.

Explanation:

5 0
3 years ago
How many mol of sodium corresponds to 1.0 x 10^15 atoms of sodium?
andrew-mc [135]
The Avogadro number represents the number of units in one mole of a chemical substance.
So to find the mole number of a chemical element, you divide its atom number of the Avogadro number which Na = 6.02*10^23 approx.
So n=N/Na (n=mole number, N=number of atoms, Na=Avogadro number)
n=1.0*10^15/6.02*10^23
n=1.6 * 10^-9

So 1.0*10^15 atoms of Sodium represent 1.6*10^-9 mol.

Hope this Helps! :)
3 0
3 years ago
Read 2 more answers
Other questions:
  • Helium decays to form lithium. 6 2 He → 6 3 Li + 0 -1 e This type of nuclear decay is called
    12·2 answers
  • What is the process of discovery that allows us to link abservations with actual facts?
    12·1 answer
  • What is the ideal gas constant?
    12·1 answer
  • Which is not a product of the fractional distillation of petroleum?
    7·1 answer
  • Rasheed calculates that his chemical reaction should produce 4 moles of product, but when he does the experiment, he gets only 3
    13·1 answer
  • A student performing this experiment weights out 0.6680 grams of an antacid tablet. It is was determined that this tablet contai
    8·1 answer
  • Any element above 92 on the
    11·2 answers
  • Some plants have fleshy stems and leaves that can store water. In which type of habitat would these adaptations be important
    10·1 answer
  • What can you tell about a solution by using a phenolphthalein solution?
    9·1 answer
  • Which of the following is the ground state electrons configuration of the F ion
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!