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horrorfan [7]
3 years ago
6

18. Why can't fingerprints be chemically removed permanently?

Chemistry
2 answers:
Zinaida [17]3 years ago
6 0

Answer:

Fingerprints are determined by your genetic makeup.  

Explanation:

Despite how much you attempt to remove them, they will grow back because of your DNA.

Lapatulllka [165]3 years ago
6 0
Ridges don’t separate so every layer of skin would have to be removed.
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The molar heat of vaporization of hydrogen fluoride (HF) is 31.18 kJ/mol. How much heat is released when 100.0 g HF condenses at
mash [69]

the answer is -155.8


8 0
3 years ago
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The electronegativity values of carbon, hydrogen, and nitrogen are compared in the table.
Fofino [41]

Answer:

C. CH₄ is less than NH₃ because the NH bond is more polar than the CH bond

Explanation:

The intermolecular forces between ammonia is far stronger than for methane. Between the molecules of ammonia we have the presence of hydrogen bonds. This bond is absent in methane.

Hydrogen bonds are one of the strongest intermolecular forces. It is as a result of the electrostatic attraction between the hydrogen atom of one molecule and the electronegative atom N, O and F of another molecule.

  • This strong interaction is absent in methane which has just dipole - dipole attraction.

The strength of the hydrogen bond depends on the electronegativity of the combining atoms.

5 0
3 years ago
The molar mass of hydrogen (H2) is 2.02 g/mol. A sample contains 4.00 mol of H2. What is the mass, in grams, of this sample? 1.9
gizmo_the_mogwai [7]
1 mol ---- 2,02 g
4 mol ---- x g

x = 4 mol × 2,02 g / 1 mol = 8,08 g

Answer : The mass of this sample is 8,08 g.

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5 0
3 years ago
What is the concentration of 60 mL of H3PO4 if it is neutralized by 225 mL of 2 M Ba(OH)2?
goldfiish [28.3K]

7.5 M is the concentration of 60 ml of H3PO4 if it is neutralized by 225 ml of 2 M Ba(OH)2.

Explanation:

Data given:

volume of phosphoric acid, Vacid =60 ml

volume of barium hydroxide, Vbase = 225 ml

molarity of barium hydroxide, Mbase = 2M

Molarity of phosphoric acid, Macid =?

the formula for titration is used as:

Macid x Vacid = Mbase x Vbase

rearranging the equation to get Macid

Macid = \frac{Mbase x Vbase}{Vacid}

Macid =\frac{225 X 2}{60}

Macid = 7.5 M

the concentration of the phosphoric acid is 7.5 M and the volume is 60 ml. Thus 7.5 M solution of phosphoric acid is used to neutralize the barium hydroxide solution of 2M.

8 0
4 years ago
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What is mass in grams of 175 mL of salt water with a density of 1.30 g/cm cubed?
Nat2105 [25]
Your final answer would be 228 G. Hope this helps!
7 0
3 years ago
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