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
Kobotan [32]
3 years ago
15

About 20-25% of the 92 natural elements are known to be essential to life. which four of these elements make up approximately 96

% of living matter?
a.carbon, sodium, hydrogen, nitrogen
b.carbon, oxygen, phosphorus, hydrogen
c.oxygen, hydrogen, calcium, nitrogen
d.carbon, hydrogen, nitrogen, oxygen
e.carbon, oxygen, nitrogen, calcium
Chemistry
1 answer:
Gnom [1K]3 years ago
5 0
E. Carbon, Oxygen, Nitrogen, & Calcium.
You might be interested in
What is transportation?
Mandarinka [93]
Movement from place to palce
3 0
3 years ago
Read 2 more answers
Options are upper left upper right bottom left bottom right for both problems please help!
polet [3.4K]

Answer:

(upper right) corner of the periodic table to the bottom left corner

6 0
3 years ago
Car wax mostly contains beeswax and carnauba wax. These large hydrocarbons are ideal to use because they _____ water.
hichkok12 [17]
These waxes are highly hydrophobic (repellant) of water, so the correct answer would be D) repel.

The wax coating put on the car creates a water repellant sheila that causes the water to bead up on the surface of the wax, rather than directly impacting the paint and surface of the body of the car. This prolongs the life and quality of the appearance of the car.
6 0
3 years ago
Read 2 more answers
When elemental boron, B, is burned in oxygen gas, the product is diboron trioxide. If the diboron trioxide is then reacted with
zalisa [80]

<u>Answer:</u> The chemical equation is written below.

<u>Explanation:</u>

Every balanced chemical equation follows law of conservation of mass.

This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form. This also means that total number of individual atoms on reactant side must be equal to the total number of individual atoms on the product side.  

The chemical equation for the reaction of elemental boron and oxygen gas follows:

4B+3O_2\rightarrow 2B_2O_3

By Stoichiometry of the reaction:

4 moles of elemental boron reacts with 3 moles of oxygen gas to produce 2 moles of diboron trioxide.

The chemical equation for the reaction of diboron trioxide and water follows:

B_2O_3+3H_2O\rightarrow 2H_3BO_3

By Stoichiometry of the reaction:

1 mole of diboron trixoide reacts with 3 moles of water to produce 2 moles of boric acid.

Hence, the chemical equations are written above.

3 0
3 years ago
How do the test variables (independent variables) and outcome variables (dependent variables) in an experiment compare? A. The t
Ghella [55]

Answer:

I'm on the exact same queston

6 0
3 years ago
Read 2 more answers
Other questions:
  • What is the mass, in grams, of solute in 255mL of a 0.0525M solution of KMnO4 (MM =
    15·1 answer
  • What steps are performed when naming ionic compounds?
    13·1 answer
  • How much heat is required to melt 26.0 g of ice at its melting point?
    10·1 answer
  • What do a mole of magnesium and a mole of iron have in common
    6·1 answer
  • Which of these is a pure substance? A) a penny B) Sugar C) ocean water D) iced tea
    5·2 answers
  • Describe any five types of isomerism encounted in coordination compound​
    5·2 answers
  • Where are red blood cells made <br><br>​
    12·2 answers
  • -how dose photosynthesis work on animals and what is it called.
    5·1 answer
  • You are given a colourless solution, it turned blue litmus paper red​
    5·1 answer
  • What is the energy of an electron in the first energy level of hydrogen?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!