Answer:
the intertidal zone, neritic zone, and oceanic zone.
Explanation:
There are 1.16x10²² sulfide <em>ions </em>(S²⁻) in 15 dg of sodium sulfide (Na₂S).
The equation for sodium sulfide is the following:
Na₂S → 2Na⁺ + S²⁻ (1)
So from equation (1), we can see that in<u> 1 mol</u> of <em>sodium sulfide</em> we have <u>1 mol</u> of <em>sulfide ions</em> and 2 moles of sodium ions.
First, let's find the number of moles of<em> Na₂S</em>
(2)
Where:
: is the mass of Na₂S = 15 dg = 1.5 g
: is the molar mass of Na₂S = 78.0452 g/mol
The <em>number of moles</em> of Na₂S is (eq 2):
We can find the number of ions of S²⁻ with Avogadro's number, knowing that the number of moles of Na₂S is equal to the number of moles of S²⁻ (eq 1).
Therefore, there are 1.16x10²² sulfide <em>ions </em>in 15 dg of sodium sulfide.
Find more about Avogadro's number here:
I hope it helps you!
Yes and no it depends on what u r useing
Answer:
Chemical change
Explanation:
Chemical changes occur through chemical reactions. In a chemical reactions, reactants combines together and gives new products. Chemical change is a kind of change in which new products are formed as a result of different bond combinations. They are often associated with the evolution and use of energy.
Chemical changes are not easily reversible and they require a considerable amount of energy. Examples of chemical changes are combustion, rusting of iron, precipitation e.t.c.
Answer ; The correct answer is : 346 m/s .
Sound is a type of longitudinal wave , which is produced when a matter compress or refracts .
Speed of sounds depends on factors like medium , density , temperature etc .
Effect of Temperature on speed of sounds :
When the temperature increases , molecules gains energy and they starts vibrating and with higher temperature vibration becomes fast . So the waves of sounds can travel faster due to faster vibrations . Hence , speed of sounds is directly proportional to the temperature or speed of sounds increases with increase in temperature .
The speed of sounds at 0⁰C is 331
The relation between speed of sound and temperature is given as :
Given : Temperature = 25 ⁰ C
Plugging values in formula =>