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Elina [12.6K]
3 years ago
5

Which can associate a suspect and the firing of a gun?

Chemistry
1 answer:
baherus [9]3 years ago
5 0
D. powder residues.
the police and forensic chemists usually perform a qualitative test called GPR or gun powder residue. the residue sticks to the skin.
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The stock concentration of NaOH is 0.5M. 0.5M = 0.500mol/1.0L.
valentinak56 [21]

Answer:a) 0.1 mole. b) 4g. c) 2% d)  196 mL

Explanation: in 200mL , 0.1mole

mw NaOH = 40g/mol —> 4g in 0.1 mole

4g in 200mL so 2g in 100mL

density NaOH = 1g/mL so if 4g in 200 mL,  4mL , 196 mL water

5 0
2 years ago
Which of the following is physical change!?
Lemur [1.5K]
<h2>_______________________</h2><h2 /><h2 /><h2>D - All of The Above</h2>

<h3>Dissolve:</h3>

To Become or cause to become incorporated into a liquid so as to form a solution.

<h3>Evaporation:</h3>

The process of changing from liquid to vapour.

<h3>Bending:</h3>

To shape or force something straight, in a curve or angle.

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6 0
3 years ago
This is a sign of a chemical reaction that involves a new color being created during the reaction.
svetoff [14.1K]
Hey there!


When two or more substances combine, they create one or more new substances, which sometimes have different molecular structures from the original substances, meaning they absorb and radiate light in different ways, leading to a color change.


Hope this helps! :)
5 0
3 years ago
How many atoms are in a solid piece of iron that has a mass of 24.0g?
Julli [10]
Atomic mass iron ( Fe ) = 55.84 a.m.u

55.84 g ------------ 6.02x10²³ atoms
24.0 g ------------- ??

24.0 x ( 6.02x10²³) / 55.84

=> 2.58x10²³ atoms
5 0
3 years ago
a substance has a definite volume but no definite shape ? state whether this substance is a solid , a liquid , or a gas.​
DerKrebs [107]

Answer:

A liquid

Explanation:

This is the answer!! Hope this helps.

4 0
3 years ago
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