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lesya692 [45]
3 years ago
12

What is physical evidence

Chemistry
1 answer:
postnew [5]3 years ago
3 0

Answer:

Physical evidence is any and all objects that can establish that a crime has been committed or can provide a link between a crime and its victim or perpetrator. ... Physical evidence aids in the solution of a case, provides an element of the crime, such as fear or force, and proves a theory in the case.

Explanation:

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Mr. Auric Goldfinger, criminal mastermind, intends to smuggle several tons of gold across international borders by disguising it
Aleks [24]

The thickness of the walls of each hollow lump of iron ore is: 0.295cm. This is determined using the knowledge of the Volume of a Hollow Sphere.

<h3>What is the Volume of a Hollow Sphere?</h3>

The formula for the Volume of a Hollow Sphere is give as:

Volume of a Hollow = 4/3 R³ – 4/3 r³

Step 1 - Find the apparent volume of 8cm diameter sphere including the wall the the hollow inside

V = 4/3 r³

V = (4/3) (8)³

V = (4/3) * (22/7) * 512

V = 2145.52cm³

Step 2 - Determine the mass of Gold required for the sphere to achieve the density of iron ore if the apparent volume is as given in Step 1 above.

Recall that Mass = Density * Volume

Mass = 5.15 *  2145.52

Mass = 11049.45

Step 3 - Find volume of gold based on mass calculated in Step 2 above

Recall that :

Volume = Mass/Density

Thus,

V = 11049.4/19.3

Thus, Volume = 572.51cm³

Step 4 - Find the width of the wall of a hollow sphere for the volume realized in step 3

Recall the initial formula:

Volume of a Hollow = 4/3 R³ – 4/3 r³

Thus, 572.51 = (4/3) (8³ - (8 - t)³)

572.51 = (4/3) *(22.7) *(8³ - (8 - t)³)

572.51 = (88/21) *(8³ - (8 - t)³)

Multiply both sides by 21 and we have

88 (512 - (8 - t)³) = 12,022.71

Simplify further
(8 - t)³ = 357.38

t = 0.9035cm

Learn more about Volume of a Hollow Sphere at:
brainly.com/question/15244746
#SPJ1

4 0
2 years ago
In the reaction between magnesium and sulfur, the magnesium atoms
Serggg [28]

Answer: Option (b) is the correct answer.

Explanation:

Atomic number of magnesium is 12 and its electronic distribution is 2, 8, 2. Whereas atomic number of sulfur is 16 and its electronic distribution is 2, 8, 6.

So, in order to attain stability a magnesium atom needs to lose its 2 valence electrons and a sulfur atom needs to gain two electrons to completely fill its octet.

Hence, magnesium on losing two electrons will acquire a +2 charge and thus, it becomes a cation. On the other hand, sulfur on gaining two electrons will acquire a -2 charge and thus, sulfur will become an anion.

Thus, we can conclude that in the reaction between magnesium and sulfur, the magnesium atoms become cations.

5 0
3 years ago
Read 2 more answers
Joel reacted 0.9845 g of iron filings with an excess of copper sulphate solution. When the reaction was complete the solution ha
asambeis [7]

From the stoichiometry of the reaction, the percentage yiled of the copper is 89.6%

<h3>What is reaction equation?</h3>

The reaction equation here is given as; Fe(s) + CuSO4 (aq) ----->FeSO4(aq) + Cu(s)

Number of moles of Fe = 0.9845 g/56 g/mol = 0.018 moles. Since the reaction is 1:1, this is also the number of moles of Cu formed.

Theoretical yiled of Cu =  0.018 moles * 63.5 g/mol = 1.143 g

Percentage yiled =  1.024 g/1.143 g * 100/1 = 89.6%

If 1 mole of Fe contains 6.02 * 10^23 molecules

0.018 moles of Fe contains 0.018 moles *  6.02 * 10^23 molecules/1 mole = 1.1 * 10^22 molecules.

Number of moles of AgNO3 =  1.35 g/170 g/mol = 0.0079 moles

Molarity of the solution = 0.0079 moles/250 * 10^-3 L = 0.0032 M

Hence; 0.0032 M * V1 = 100 mL  *  0.01 M

V1 = 312.5 mL

Learn more about stoichiometry: brainly.com/question/9743981

8 0
2 years ago
The digestive system is a group of organs working together to convert food into energy and basic nutrients that are transported
IgorLugansk [536]
B.................................
6 0
3 years ago
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Anexample of a weak acidis<br> OH SO.<br> OH
dolphi86 [110]
Citric acid
Ethanoic acid
Methanoic acid
Lactic acid
7 0
3 years ago
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