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2 years ago

Forensic chemistry

Chemistry

1 answer:

Rina8888 [55]2 years ago

5 0

Explanation:

clinical laboratory test results are a very important parameter in diagnosis, monitoring and screening. 70-80 ... it is possible to determine whether you can interpret the test result as being ...

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5. A beam of photons with a minimum energy of 222 kJ/mol can eject electrons from a potassium surface. Estimate the range of wav

torisob [31]

Answer: The range of wavelengths of light that can be used to cause given phenomenon is $8.953 \times 10^{21} m$ .

Explanation:

Given: 222 kJ/mol (1 kJ = 1000 J) = 222000 J

Formula used is as follows.

$E = \frac{hc}{\lambda}$

where,

E = energy

h = Planck's constant = $6.625 \times 10^{-25} Js$

c = speed of light = $3 \times 10^{8} m/s$

Substitute the values into above formula as follows.

$E = \frac{hc}{\lambda}\\222000 J = \frac{6.625 \times 10^{-34}Js \times 3 \times 10^{8} m/s}{\lambda}\\\lambda = 8.953 \times 10^{21} m$

Thus, we can conclude that the range of wavelengths of light that can be used to cause given phenomenon is $8.953 \times 10^{21} m$ .

7 0

3 years ago

Write a net ionic equation for the overall reaction that occurs when aqueous solutions of hydrosulfuric acid (H2S) and sodium hy

erica [24]

Answer:

H2S(g) + 2OH^-(aq) --------> S^2-(aq) + 2H2O(l)

Explanation:

We know that the net ionic equation shows the major reaction that occurs in the reaction system.

The molecular reaction equation is;

H2S(g) + 2NaOH(aq) ------> Na2S(aq) + 2H2O(l)

The complete ionic equation is;

H2S(g) + 2Na^+(aq) + 2OH^-(aq) --------> 2Na^+(aq) + S^2-(aq) + 2H2O(l)

Net ionic equation;

H2S(g) + 2OH^-(aq) --------> S^2-(aq) + 2H2O(l)

3 0

2 years ago

Which of the following statements is true?

Ivan

Answer:

Explanation:

Most metals can be drawn into a wire while nonmetals would break apart.

5 0

3 years ago

Read 2 more answers

Thr kind of energy that electromagnetic waves carry is call --------------------- energy?

hammer [34]

Electromagnetic radiation

6 0

3 years ago

How important is the resonance structure shown here to the overall structure of carbon dioxide?

Tcecarenko [31]

1. Resonance structures are a better description of a Lewis dot structure .

2. Best resonance structure is the one with the least formal charge.

<u>EXPLAINATION OF RASONANCE STRUCTURE OF CARBON DIOXIDE</u>

1.Carbon dioxide has three resonance structures .

2. The CO2 molecule has a total of 16 valence electrons ,

1C = 4 electrons

2O= 12 electrons

<u>three resonance structures for CO2</u>

1. The atoms in all three resonance structures have full octets;

structure 1 will be more stable because it has no separation of charge.

2. Structures 2 and 3 show charge separation caused by the presence of formal charges on both oxygen atoms.

6 0

3 years ago