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BabaBlast [244]
3 years ago
9

What is biological oxygen demand

Chemistry
2 answers:
Novosadov [1.4K]3 years ago
7 0
<span> is the amount of </span>dissolved oxygen<span> needed by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period. </span>
jek_recluse [69]3 years ago
5 0

Hey there!!

Biological Oxygen demand is the amount of dissolved oxygen needed  by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.

Hope this helped you and have a fantastic day! (:

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The standard unit for measuring volume is the _____.
Otrada [13]
The answer is B I hope this helps you
4 0
3 years ago
Ag(s)+CN−(aq)+O2(g)→Ag(CN)−2(aq) Express your answer as a chemical equation. Identify all of the phases in your answer. Express
Lerok [7]

Answer : The balanced redox reaction will be,

4Ag(s)+8CN^-(aq)+O_2(g)+4H^+(aq)\rightarrow 4Ag(CN)_2^-(aq)+2H_2O(l)

Explanation :

The given chemical equation is,

Ag(s)+CN^-(aq)+O_2(g)\rightarrow Ag(CN)_2^-(aq)

In the half reaction method, the number of atoms in each half reaction and number of electrons must be balanced.

The half reactions in the acidic medium are :

Reduction : O_2(g)+4H^+(aq)+4e^-\rightarrow 2H_2O(l)   ......(1)

Oxidation : Ag(s)+2CN^-(aq)\rightarrow Ag(CN)_2^-(aq)+1e^-  .......(2)

Now multiply the equation (2) by 4 and then added both equation, we get the balanced redox reaction.

Thus, the balanced redox reaction will be,

4Ag(s)+8CN^-(aq)+O_2(g)+4H^+(aq)\rightarrow 4Ag(CN)_2^-(aq)+2H_2O(l)

7 0
4 years ago
What’s the formula equation for
jeyben [28]
If you have a magnesium for every oxygen, then you have to start with two magnesiums. So the balanced equation is 2 Mg + O2 2 MgO.

And

CaCO3———→CaO + CO2

I hope it helped!

7 0
3 years ago
Read 2 more answers
Copper reacts with nitric acid releasing nitrogen dioxide gas. Why is this answer<br>right?​
Contact [7]

Explanation:

Nitric acid reacts with copper according to the reaction: ... 4 HNO3(l) + Cu(s) ==> Cu(NO3)2(s and aq) + 2 NO2(g) + 2 H2O(l) The copper nitrate salt that forms is a deep blue color. The nitrogen dioxide is a maroon vapor.

4 0
4 years ago
A 0.250 g sample of hydrocarbon (containing only carbon and hydrogen) undergoes complete combustion to produce 0.845 g of CO2 an
melomori [17]

Answer:

CH

Explanation:

We have to obtain the mass of carbon and hydrogen in CO2 and H2O respectively.

For carbon in CO2;

0.845 * 12/44 = 0.23 g

For hydrogen in H20;

0.173 * 2/18 = 0.019 g

We convert the masses to moles of carbon and hydrogen

For carbon - 0.23/ 12 = 0.019 moles

For hydrogen - 0.019/1 = 0.019 moles

Dividing by 0.019 moles for carbon and hydrogen we have the emperical formula of the compound as CH

5 0
3 years ago
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