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
Eddi Din [679]
3 years ago
6

Name and symbol for the first 20 elements.​

Chemistry
2 answers:
dusya [7]3 years ago
5 0

Answer:1 Hydrogen H

2 Helium He

3      Lithium Li

4 Beryllium Be

5 Boron B

6 Carbon C

7 Nitrogen N

8 Oxygen O

9 Fluorine F

10 Neon Ne

11 Sodium Na

12 Magnesium Mg

13 Aluminum Al

14 Silicon Si

15 Phosphorus P

16 Sulfur S

17 Chlorine Cl

18 Argon Ar

19 Potassium K

20 Calcium Ca

Explanation:

velikii [3]3 years ago
4 0

Answer:

H - Hydrogen

He - Helium

Li - Lithium

Be - Beryllium

B - Boron

C - Carbon

N - Nitrogen

O - Oxygen

F - Fluorine

Ne - Neon

Na - Sodium

Mg - Magnesium

Al - Aluminum

Si - Silicon

P - Phosphorus

S - Sulfur

Cl - Chlorine

Ar - Argon

K - Potassium

Ca - Calcium

Explanation:

You might be interested in
The mass ratio of H:S:O in sulfuric acid today is 1:8:32. Predict the mass ratio of sulfuric acid in 23th century.
lions [1.4K]
You can find the answer on chegg.com. Hope that help :)
8 0
3 years ago
What is the purpose of the rice paddies and how they are used? (Site 1)
Butoxors [25]

Answer:The purpose of rice paddies is to grow rice in dry areas or areas that don't get that much rain. Also, they are used by using flooded water to grow.

Explanation:

3 0
3 years ago
A chemist must prepare 900.0mL of sodium hydroxide solution with a pH of 13.90 at 25°C. She will do this in three steps: Fill a
Ierofanga [76]

Answer:

28.58 g of NaOH

Explanation:

The question is incomplete. The missing part is:

<em>"Calculate the mass of sodium hydroxide that the chemist must weigh out in the second step"</em>

To do this, we need to know how much of the base we have to weight to prepare this solution.

First we know that is a sodium hydroxide aqueous solution so, this will dissociate in the ions:

NaOH -------> Na⁺ + OH⁻

As NaOH is a strong base, it will dissociate completely in solution, so, starting with the pH we need to calculate the concentration of OH⁻.

This can be done with the following expression:

14 = pH + pOH

and pOH = -log[OH⁻]

So all we have to do is solve for pOH and then, [OH⁻]. To get the pOH:

pOH = 14 - 13.9 = 0.10

[OH⁻] = 10⁽⁻⁰°¹⁰⁾

[OH⁻] = 0.794 M

Now that we have the concentration, let's calculate the moles that needs to be in the 900 mL:

n = M * V

n = 0.794 * 0.9

n = 0.7146 moles

Finally, to get the mass that need to be weighted, we need to molecular mass of NaOH which is 39.997 g/mol so the mass:

m = 39.997 * 0.7146

<h2>m = 28.58 g</h2>
3 0
4 years ago
PLEASE HELP WILL BE MARKING BRAINIEST!!!!!
o-na [289]

Answer:water

Explanation:

to easy

6 0
3 years ago
What are the two types of elements that make covalent bonds
velikii [3]

Answer:

Two non metal combined together and form the bond is called covalent bond

Note - yellow color molecules in pictures are non metal elements

example - co2 , so2,

Explanation:

6 0
4 years ago
Other questions:
  • The equationrepresents a system _____ . that goes to completion in chemical equilibrium that does not change in physical equilib
    9·1 answer
  • PLEASE HELP, I don't understand my Oxidation homework!
    15·1 answer
  • Help plzzzzzzzzzz ASAP!!!
    12·2 answers
  • Help please..................
    6·1 answer
  • Calculate the pZn of a solution prepared by mixing 25.0 mL of 0.0100 M EDTA with 50.0 mL of 0.00500 M Zn2 . Assume that both the
    7·1 answer
  • How many atoms are in a sample of 1.83 moles of potassium (K) atoms? Please explain the conversions to me. Thank you!
    8·1 answer
  • Someone please help!!
    13·1 answer
  • If you have 45.0g of mercury Il perchlorate, how many moles do you have?
    6·1 answer
  • K3PO4(aq)+MgCl2(aq)⟶
    11·1 answer
  • Laser light is invisible until it is _________________________ off something like smoke.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!