Please help me figure this out! God bless you <3

A(n) ________is your legal document issued by a government that gives an inventor exclusive rights to make use or sell intervent

Crazy boy [7]

Patent - Not sure if this is much of a Chem question dou.

7 0

4 years ago

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what electronic transition in a hydrogen atom starting from n=7 energy level will produce infrared radiation with energy of 55.1

Lostsunrise [7]

Answer:

(n = 7) ⟶ (n = 4)

Explanation:

1. Convert the energy to joules per mole of electrons.

E = 55.1 × 1000 = 55 100 J/mol

2. Convert the energy to joules per electron

E = 55 100/(6.022 × 10²³)

E = 9.150 × 10⁻²⁰ J/electron

3. Use the Rydberg equation to calculate the transition

Rydberg's original formula was in terms of wavelengths, but we can rewrite it to have the units of energy. The formula then becomes

$\Delta E = R_{\text{H}} (\frac{ 1}{ n_{f}^{2}} - \frac{ 1}{ n_{i}^{2}})$

where

$R_{\text{H}}$ = the Rydberg constant = 2.178 × 10⁻¹⁸ J

$n_{i}$ and $n_{f}$ are the initial and final energy levels.

$9.150 \times 10^{-20} = 2.178 \times 10^{-18}(\frac{ 1}{ n_{f}^{2}} - \frac{ 1}{ 7^{2}})$

$\frac{9.150 \times 10^{-20} }{2.178 \times 10^{-18}} = \frac{ 1}{ n_{f}^{2}} - \frac{ 1}{ 49}$

$\frac{ 1}{ n_{f}^{2}} = \text{0.042 01} + \frac{1 }{49 }$

$\frac{ 1}{ n_{f}^{2}} = \text{0.042 01 + 0.020 41}$

$\frac{ 1}{ n_{f}^{2}} = \text{0.062 42}$

$n_{f}^{2} = \frac{1 }{ \text{0.062 42}}$

$n_{f}^{2} = 16.02$

$n_{f} = \sqrt{16.02}$

$n_{f} = 4.003 \approx 4$

4 0

3 years ago

Wat substance cannot be separated physically or chemically?

Tresset [83]

Answer:

Anything that cannot be separated physically or chemically is an element.

5 0

3 years ago

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A. What mass (in g) of KIO3 is needed to prepare 50.0 mL of 0.20 M KIO3?

rewona [7]

Answer:

A. 2.139g of KIO3

B. 26.67mL

Explanation:Please see attachment for explanation

3 0

3 years ago

Fe-C-Cr alloy is covalent or ionic?

Vikentia [17]

Answer:

covalent....................

4 0

3 years ago