3 years ago

I did this on accident lol

Chemistry

2 answers:

andrew11 [14]3 years ago

8 0

Well thanks now I don’t have to answer a question!

k0ka [10]3 years ago

5 0

Hey what is ur question

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How many protons, neutrons, and electrons does potassium-38 have?

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Answer:

19 protons, 20 neutrons and 18 electrons.

Explanation:

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3 years ago

What is the wavelength of a photon with an energy of 3.38 x 10-19 J?

irina1246 [14]

Answer:

C. 588 nm

Explanation:

Given parameters:

Energy of the photon = 3.38 x 10⁻¹⁹J

Unknown:

Wavelength of the photon = ?

Solution:

The energy of a photon can be expressed as;

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

hc = E x wavelength

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

h is the Planck's constant = 6.63 x 10⁻³⁴m²kg/s

c is the speed of light = 3 x 10⁸m/s

E is the energy

Wavelength = $\frac{6.63 x 10^{-34} x 3 x 10^{8} }{3.38 x 10^{-19} }$ = 5.89 x 10⁻⁷m

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3 years ago

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properties of elements within a ________ on the periodic table change in a predictable way from one side of the table to the oth

SpyIntel [72]

Properties change within a Row (or period) as the number of valence electrons in the outer shell increase

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3 years ago

A gas that exerts a pressure of 15.6 psi in a container with the volume of ______ L will exert a pressure of 24.43 psi when tran

dybincka [34]

Boyle's Law states: pV = constant.

24.43 x 1.895 = 46.29485

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unknown = 2.968L

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For the Bradford assay, the instructor will make a Bradford reagent dye by mixing 50 ml of 95% v/v ethanol with 100 mg of Coomas

Flauer [41]

Answer:

4.25% is the final concentration of phosphoric acid.

Explanation:

Initial concentration of phosphoric acid = $C_1=85\%=0.85$

Initial volume of phosphoric acid = $V_1=50 mL$

Final concentration of phosphoric acid = $C_2=?$

Final volume of phosphoric acid = $V_2=1 L=1000 mL$

( 1L = 1000 mL)

$C_1V_1=C_2V_2$

$C_2=\frac{C_1times V_1}{V_2}$

$=\frac{0.85\times 50 mL}{1000 mL}=0.0425=4.25%$

4.25% is the final concentration of phosphoric acid.

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3 years ago