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3 years ago

what type of recording do you think would be the best method of submitting evidence to a crime lab? why?

Chemistry

2 answers:

arlik [135]3 years ago

7 0

The type of recording that is the best and most useful method of submitting evidence to a crime lab is by videography.

The videography is the type of evidence that pretty much contains everything that can be get from a recording because it has both the visual aspects and the audio aspects of the crime scene. It can be said that the videography represents the ultimate type of notes.

zhannawk [14.2K]3 years ago

6 0

Answer:

The type of recording that is the best and most useful method of submitting evidence to a crime lab is by videography.

Explanation:

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What is Kb for N2H4 if the pH of a 0.158M solution of N2H5Cl is 4.5?

olasank [31]

Answer:

Kb $= 1.58 * 10^{-6}$

Explanation:

The correct question is

What is Kb for N2H4 if the pH of a 0.158M solution of N2H5Cl is 4.5?

Solution-

N2H4Cl hydrolyses on addition of water

The reaction equation is as follows -

N2H4+ + H2O ----> N2H4 + H3O+

$Ka = \frac{K_w}{K_b} = \frac{10^{-14}}{K_b}$

pH $= 4.5$

$[H+] = 10^{-pH} = 10^{-4.5}$

$K_b= \frac{10^{-14} }{K_b} = \frac{Y_2}{0.158} \\K_b= \frac{(10^{-4.5})^2}{0.158}\\=> Kb = 0.158 * 10-14 /(10-4.5)2$

Kb $= 1.58 * 10^{-6}$

3 0

2 years ago

Currently, the primary source of sulfur dioxide emissions into the atmosphere is Group of answer choices coal burning power plan

LiRa [457]

From what we know we can confirm that currently, the primary source of sulfur dioxide of emissions into the atmosphere is coal and other fossil fuel burning in industry.

<h3 /><h3>What are the consequences of Sulfur dioxide in the atmosphere?</h3>

From what we know, this compound has proved to be quite toxic for humans to breathe. Increased concentrations of this in the atmosphere lead to increased rates of lung disease among other health complications.

Therefore, we can confirm that the primary source of sulfur dioxide of emissions into the atmosphere is coal and other fossil fuel burning in industry.

To learn more about pollution visit:

brainly.com/question/1040743?referrer=searchResults

7 0

2 years ago

Would you expect manganese(II) oxide, MnO, to react more readily with HF(aq) or NaOH(aq)?

ella [17]

Answer:

NaOH(aq)

Explanation:

NaOH(aq) is known to precipitate Mn^2+ ions according to the following reaction; Mn^2+(aq)+2OH^−(aq)↽−−⇀Mn(OH)2(s)

Hence, manganese(II) oxide reacts more readily with NaOH(aq) under ordinary conditions precipitating the metal hydroxide solid. This is one of the characteristic reactions of Mn^2+.

3 0

3 years ago

What the the compound formula of Fe2+ + N3- ?

Gala2k [10]

Answer:

Explanation:

8 0

3 years ago

Compound Y has a distribution coefficient of 4.0 when extracted from water with chloroform, with Y being more soluble in chlorof

Aleks04 [339]

Answer:

There are needed 3 extractions to extract at least 95%

Explanation:

The distribution coefficient of a compound is defined as the ratio in concentration of the compound in the organic solvent and the concentration in the aqueous solution:

K = Concentration organic solvent / Concentration in water

Assuming as initial amount of the organic solvent: 100% and X as the amount of Y that is extracted

<em>First extraction:</em>

4 = X / 10mL / (100-X) / 50mL

4 = 50X / 1000-X

4000 - 4X = 50X

4000 = 54X

X = 74.1%

In the first extraction, 74.1% of Y is extracted

And will remain: 100 - 74.1 = 25.9%

<em>Second extraction:</em>

4 = X / 10mL / (25.9-X) / 50mL

4 = 50X / 259-X

1036 - 4X = 50X

1036 = 54X

X = 19.2%

In the second extraction, 19.2% of Y is extracted

And will remain: 25.9 - 19.2 = 6.7%

<em>Third extraction</em>

4 = X / 10mL / (6.7-X) / 50mL

4 = 50X / 67-X

268 - 4X = 50X

268 = 54X

X = 5.0%

In the first extraction, 5.0% of Y is extracted

And are extracted:

74.1% + 19.2% + 5.0% = 98.3%

That means there are needed 3 extractions to extract at least 95%

4 0

2 years ago