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yulyashka [42]
4 years ago
10

How is the evidence from a fire scene collected? What should be avoided?

Chemistry
2 answers:
timama [110]4 years ago
5 0
Fire scenes<span> are different than regular crime </span>scenes<span> because the </span>evidence<span> that was at the.</span>Evidence from a fire scene<span> is </span>collected<span> by being placed in an air-</span><span>airtight.Plastic bags </span>should be avoided<span> because they can produce dangerous gases</span>
sveticcg [70]4 years ago
3 0

Answer:

Explanation:

In fire and arson cases evidences like volatile fuel in the sediment debris can be collected. The debris should be collected in an air-tight container like tin or paint box and bottles so as to prevent the evaporation of the fuel. The type of fuel used for setting up the fire is an important evidence.

Plastic bags should not be used because the plastic can react with the fuel components and may react with the fuel components in debris and the evidence will become futile.

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3 years ago
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Hạt nhân của nguyên tử X có điện tích là 30,4.10-19 culông. Tìm số p,e của nguyên tử X
Maslowich

Answer:

Hạt nhân của nguyên tử X có điện tích là 30,4.10-19 culông. Tìm số p,e của nguyên tử X

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3 years ago
What is the mole ratio that can convert from moles of A to moles of B?
kaheart [24]
There is no direct way to convert from the mass of one substance to the mass of another. To convert from one mass (substance A) to another mass (substance B), you must convert the mass of A first to moles, then use the mole-to-mole conversion factor (B/A), then convert the mole amount of B back to grams of B.
8 0
3 years ago
Calcium and bromine have formed a bond. Leading up to this, calcium gave up electrons. It was a(n) ____.
Ugo [173]

<u><em>Answer:</em></u>

It was a positive ion.

<u><em>Explanation</em></u>

In CaBr, ionic bond is present. When one of the atom loses electrons and gets positive charges and other atom gains electrons and become negative. As a result of positive and nagative charges , a ionic bond formed.

As in this case, Ca loses electrons and become positive ion while on the other hand bromide gets the electrons and become negative ion.

<em>Note:</em>

Electropositive atoms always loose electrons Like Ca while electronegative atoms always gain elelctrons like Br.

5 0
4 years ago
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PLEASE HELP ASAP!!!<br> K+ has how many electrons? <br> -19<br> -18<br> -20<br> -none of these
Y_Kistochka [10]

Answer:

Its 19.

Explanation:

K (potassium) has 19 electron according to the atomic number in the periodic table. The atomic number tells you the number of protons and electrons.

8 0
3 years ago
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