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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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Molarity of a salt water solution of "0.47" moles of NaCl dissolved in a volume of 0.25L
asambeis [7]

Answer:

1.88 M

Explanation:

The following data were obtained from the question:

Mole of NaCl = 0.47 mole

Volume of solution = 0.25L

Molarity =?

Molarity is defined as the mole of solute per unit litre of the solution. It can represented mathematically as:

Molarity = mole /Volume

Using the above formula, the molarity of the salt water solution can be obtained as follow:

Molarity = 0.47/0.25

Molarity = 1.88 M

5 0
2 years ago
Plzzzzz help me to solve this question.​
aleksklad [387]

Answer:

Explanation:

A1. Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.

A2. The reaction of an acid with a base is called a neutralization reaction. The products of this reaction are a salt and water. ... For example, the reaction of hydrochloric acid, HCl, with sodium hydroxide, NaOH, solutions produces a solution of sodium chloride, NaCl, and some additional water molecules

A3. Methyl orange has the property to color alkaline and neutral water yellow. If the water becomes acidic, it turns red immediately.

3 0
3 years ago
How are oxidation-reduction reactions related to how you use energy?​
Alexxandr [17]

Answer:

In oxidation reduction reactions, one species gets reduced by taking on electron(s) and another species gets oxidized by losing electrons. The movement of electrons can be used to do work. ... The electron flow can be run through a wire and these electrons can be used to do work (like run a battery). Hope this helps.

3 0
2 years ago
What is the molecular weight for H3PO4
Dominik [7]
<span>H</span>₃<span>PO</span>₄<span> - Phosphoric Acid :

H</span>₃<span>PO</span>₄<span> = 1.0 * 3 + 31.0 + 16.0 * 4 = 98.0 g/mol

hope this helps!</span>
5 0
3 years ago
The majority of the world’s water is stored in?
aniked [119]

Answer:

Ocean

Explanation:

97 percent of the water in the world is in the ocean.

The 3 percent of freshwater is located in lakes, streams, glaciers, and can be found underground.

8 0
3 years ago
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