A chemical substance has the characteristics that it cannot be separated by physical methods. Seawater and milk can be separated by sedimentation, and air has different components depending on other aspects (such as elevation). Only ammonia is a substance. (thus it can have a formula: NH<span>3)</span>
Answer:
50 g of K₂CO₃ are needed
Explanation:
How many grams of K₂CO₃ are needed to make 500 g of a 10% m/m solution?
We analyse data:
500 g is the mass of the solution we want
10% m/m is a sort of concentration, in this case means that 10 g of solute (K₂CO₃) are contained in 100 g of solution
Therefore we can solve this, by a rule of three:
In 100 g of solution we have 10 g of K₂CO₃
In 500 g of solution we may have, (500 . 10) / 100 = 50 g of K₂CO₃
Answer:
56.69905
Explanation:
The conversion factor from pounds to kilograms is 0.45359237, which means that 1 pound is equal to 0.45359237 kilograms.
Yes oxygen is an element it is
the 8th element
the second period
16th group
noble gas configuration [He]2s^22p^4
Answer:
is Bronsted Lowry base.
is Bronsted Lowry acid.
Explanation:
According to the Bronsted Lowry conjugate acid-base theory:
- An acid is defined as a substance which donates protons and form conjugate base
- A base is defined as a substance which accepts protons and forms conjugate acid.
is Bronsted Lowry base.It accepts protons and forms conjugate acid 
is Bronsted Lowry acid.It donates protons and forms conjugate base 
There in no exchange of proton in an above reaction.Neither of the reactants and products are Bronsted Lowry acid or Bronsted Lowry base
