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2 years ago

What is a DNA fingerprint and why is it considered individual evidence?

Chemistry

1 answer:

Ilia_Sergeevich [38]2 years ago

5 0

Answer:

DNA fingerprinting is a laboratory technique used to establish a link between biological evidence and a suspect in a criminal investigation. 

A DNA sample taken from a crime scene is compared with a DNA sample from a suspect. If the two DNA profiles are a match, then the evidence came from that suspect.

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What is the difference between the number of electrons in an atom of selenium,Se, and the number of electrons in an atom of alum

aliina [53]

Answer:

A)21

Explanation:

To know the difference between the number of electrons in the two atoms, we must first know the number of electrons in the atoms.

For Selenium, Se, we have 34 electrons. The element is in group 6 on the periodic table.

Aluminum on the other hand is in the Boron family with a total of 13 electrons.

The difference,( 34-13) electrons gives a total of 21 electrons

5 0

3 years ago

Read 2 more answers

According to the following reaction, how many moles of oxygen gas are necessary to form 0.408 moles carbon dioxide?

Neporo4naja [7]

Answer:

2 molecules of oxygen are necessary

3 0

2 years ago

For the rxn CaCo3(s)+2Hcl(aq)_CaCl(aq)+Ca2(g)+H2O(l)68.1 g solid CaCo3 is mixed with 51.6Hcl what number of grams of Co2 will be

Svetach [21]

Answer:

29.9 g of CO₂ will be produced by the reaction.

Explanation:

This is the reaction:

CaCO₃(s) + 2HCl (aq) → CaCl₂(aq) + CO₂(g) + H₂O(l)

First of all, we state the moles of each reactant:

68.1 g . 1mol/ 100.08g = 0.680 mol of carbonate

51.6 g . 1 mol/36.45g = 1.46 mol of acid.

The solid salt is the limiting reactant. Ratio is 2:1

2 moles of acid can react to 1 mol of salt

1.46 mol of acid may react with (1.46 . 1)/2 = 0.727 moles

As we only have 0.680 moles of salt, we do not have enough.

Let's work at the product side. Ratio is 1:1

1 mo of salt can produce 1 mol of gas

0.680 moles will produce 0.680 moles of gas

We convert the moles to mass → 0.680 mol . 44g / 1mol = 29.9 g of CO₂

8 0

3 years ago

A 1.00-mole sample of C6H12O6 was placed in a vat with 100 g of yeast. If 32.3 grams of C2H5OH was obtained, what was the percen

Rasek [7]

Answer:

y = 35.06 %.

Explanation:

The reaction of fermentation is:

C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ (1)

From the reaction (1) we have that 1 mol of C₆H₁₂O₆ produces 2 moles of C₂H₅OH, then the number of moles of C₂H₅OH is:

$n = \frac{2 moles C_{2}H_{5}OH}{1 mol C_{6}H_{12}O_{6}}*1 mol C_{6}H_{12}O_{6} = 2 moles C_{2}H_{5}OH$

Now, we need to find the mass of C₂H₅OH:

$m = n*M = 2 moles*46.07 g/mol = 92.14 g$

Finally, the percent yield of C₂H₅OH is:

$\% = \frac{32.3 g}{92.14 g}*100 = 35.06 \%$

Therefore, the percent yield of C₂H₅OH is 35.06 %.

I hope it helps you!

6 0

3 years ago

In the diagram to the right, the battery provides 12 V to the circuit made up of three identical light bulbs. When the switch is

chubhunter [2.5K]

I don’t know I need that answer to

3 0

3 years ago