Answer:
It's D the number of organisms an ecosystem can support.
Check if it's right first then if it is, happy to help
Answer:
A. No precipitate is formed
Explanation:
Hello,
In this case, since the reactions are:
We evidence no formation of insoluble salts or precipitates since both calcium and barium chlorides are largely soluble in water due to the ionic bond which binds them, thus A. No precipitate is formed.
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Hydrogen peroxide is a powerful oxidizer. When exposed to sunlight it quickly decomposes to form water and oxygen as given by the following equation.
2H2O2(aq) → 2H2O(l) + O2(g)
Hydrogen peroxide is commercially available as a 30% w/w solution, which is the concentration that would facilitate the above reaction. This implies that the concentration would be 30 g of H2O2 in 100 g of the solution.
Explanation:
In nitrate ion that is 
,have negative charge on overall ion. Negative charge on the one oxygen atom is de-localized to other oxygen atoms present in the molecule of a nitrate ion. Due to this resonance nitrate ions get stabilized.
For resonance structures for the nitrate ion, refer to image attached.
Five base SI units that are commonly used in Chemistry; are
1.Metre (m)
2. Kilogram(kg)
3. seconds(s)
4.Kelvins (k)
5. Moles (mol)
