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Lapatulllka [165]
3 years ago
9

Explain how both biochemical oxygen demand and chemical oxygen demand are measured. microbiology

Chemistry
1 answer:
tino4ka555 [31]3 years ago
6 0
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I need help for this question
sesenic [268]

Answer:

Blanced

Explanation:

5 0
4 years ago
PLEASE HELP
denis23 [38]

Answer:

line graph

Explanation:

6 0
3 years ago
The North Pole of a magnet will attract to the South Pole of another magnet. True or False
hodyreva [135]

pretty sure its True hope this helped

Explanation:

A magnet has two ends called poles; one end is the north pole and the other is the south pole. A north pole will attract a south pole; the magnets pull on each other. But the two north poles will push each other away. ... The magnet is attracted by the earth's magnetic north pole and always points in that direction.

7 0
3 years ago
79. Methane, the chief component of natural gas, burns in oxygen according to the equation
Andrews [41]

Answer:

14 mol

Explanation:

                                CH4(g) + 2O2(g) -------» CO2(g) + 2H2O(g)

from reaction          1 mol                                                2 mol

given                       7 mol                                                x mol

x = (7*2)/1 = 14 mol

6 0
3 years ago
Compounds A and B are constitutional isomers (same molecular formula but
Naily [24]

Answer:

Trimethylacetaldehyde

Explanation:

For the <u>unknow compound</u> we have a molar mass of 86 g/mol. We have an even value for the mass, so the compound does <u>not have nitrogen</u> and we can have several posibilities:

A) C_3H_2O_3

B) C_4H_6O_2

C) C_5H_1_0O

D) C_6H_1_4

If we check the IR info a signal in 1730 cm-1 appears, this indicates that we have an <u>oxo group</u> (C=O). So, the D option can be discarded. The groups that can have the oxo group are: Carboxylic acids, <u>Ketones and aldehydes</u>.

We don have a signal in 3000 cm-1, so the carboxylic acid can be discarded. Now, is we check the info for the 1H NMR we only have 2 signals. If we only have 2 we will have a very<u> symmetric compound</u>.

By trial an error the find the compound <u>Trimethylacetaldehyde</u> (Figure 1).

3 0
3 years ago
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