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
finlep [7]
3 years ago
12

What are the four most important elements on earth?

Chemistry
2 answers:
Hoochie [10]3 years ago
8 0

Answer:

These four atomic elements are oxygen, carbon, hydrogen, and nitrogen.

Explanation:

hope it helps....

vova2212 [387]3 years ago
5 0

Answer:

Nitrogen/Carbon/Oxygen/Hydrogen

Explanation:

I believe those would be the most important because:

Nitrogen - Composing 78% of earths atmosphere.

Carbon - Building blocks for all known life.

Oxygen - We breath it as well as it composes 21% of our atmosphere.

Hydrogen - Makes up a bunch of compounds (like water) that enable humans to live.

You might be interested in
What is the difference between a gas and a solid
Yuliya22 [10]
A gas can move around freely while a solid is hard and can’t move around freely
7 0
3 years ago
Read 2 more answers
Track runner will all cover the same distance. The winner will take
joja [24]

Answer:

This question sadly does not make much sense, please rephrase it.

3 0
3 years ago
Read 2 more answers
The molar solubility of pbi2 is 1.5 103 m.
Vsevolod [243]

Answer: -

Concentration of PbI₂ = 1.5 x 10⁻³ M

PbI₂ dissociates in water as

PbI₂ ⇄ Pb²⁺ + 2 I⁻

So PbI₂ releases two times the amount of I⁻ as it's own concentration when saturated.

Thus the molar concentration of iodide ion in a saturated PbI₂ solution = [ I⁻] =

= 1.5 x 10⁻³ x 2 M

= 3 x 10⁻³ M

PbI₂ releases the same amount of Pb²⁺ as it's own concentration when saturated.

[Pb²⁺] = 1.5 x 10⁻³ M

So solubility product for PbI₂

Ksp = [Pb²⁺] x [ I⁻]²

=1.5 x 10⁻³ x (3 x 10⁻³)²

= 4.5 x 10⁻⁹

8 0
3 years ago
What are two methods of writing a balanced formula?
Irina-Kira [14]
Format Method - Writing the symbol of the cation and then the anion. Add whatever subscripts in order to balance the charges.

Crisscross Method - The numerical value of the charge of each ion is crossed over and becomes the subscripts for the other ion.
8 0
3 years ago
What are some facts about animal cells
11111nata11111 [884]
Compared to plant cells, which are shaped somehow like a box, animal cells are round and circular.

I hope this helps, please Brainliest me, and have a great day! :D
3 0
3 years ago
Read 2 more answers
Other questions:
  • Calculate the ph of a solution that is 0.6 m in sodium acetate and 0.2 m in acetic acid. ka = 1.8 × 10−5 for acetic acid. 1. ph
    12·1 answer
  • Which of the following is the best example of a hypothesis?
    12·1 answer
  • I have a problem of eating to much chods,what can help me stop?
    9·1 answer
  • The number of atoms of sulfur in 2.66 grams of sulfur
    10·1 answer
  • Samira has two pens. She wants to know which pen was used to write a note. She labels her pens A and B. She puts a sample of ink
    5·1 answer
  • What is geography and importance of geography<br><br>​
    15·1 answer
  • What are 3 elements similar to silver
    6·2 answers
  • One isotope of oxygen differs from another isotope of oxygen in *
    8·1 answer
  • What is Bohr's atomic model? ​
    9·1 answer
  • (Use P_T for total pressure; P_water vapor for water vapor pressure; P_hydrogen gas for hydrogen gas pressure)
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!