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2 years ago

An element's atomic number represents

2 answers:

7 0

The atomic number is the amount of protons in the atoms nucleus. The mass number is the amount of protons and neutrons in the atoms nucleus. Hope this helps! :)

Svetradugi [14.3K]2 years ago

5 0

the second options

the number of protons and electrons found in that element

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Which nuclear emission is negatively charged?

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4 years ago

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Write a balanced formation equation at standard conditions for the compound HI.

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H₂(g) + I₂(s) = 2HI(g)

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What is the Ka value if pka=10.36

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The energy in eV for light with a wavelength of 6250 angstroms is _. Note - there are 1.6 x 10-12 erg in 1 eV.

vivado [14]

Answer:

2 eV

Explanation:

The energy of a photon of light is given by the formula

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

where

h is the Planck constant

c is the speed of light

$\lambda$ is the wavelength of the photon

In this problem we have:

$h=6.63\cdot 10^{-34} Js$

$c=3.0\cdot 10^8 m/s$

$\lambda=6250 A = 6250\cdot 10^{-10} m$ is the wavelength of the photon

Therefore, the energy in Joules is

$E=\frac{(6.63\cdot 10^{-34})(3.0\cdot 10^8)}{6250\cdot 10^{-10}}=3.2\cdot 10^{-19}J$

We want to convert this energy into electronvolts: we know that the conversion factor is

$1 eV = 1.6\cdot 10^{-19}J$

Therefore,

$E=\frac{3.2\cdot 10^{-19}}{1.6\cdot 10^{-19}}=2 eV$

5 0

3 years ago

suppose that two hydroxides, moh and m′ (oh)2, both have a ksp of 1.39 × 10−12 and that initially both cations are present in a

11Alexandr11 [23.1K]

When base is added in order to increase the pH of a solution, it results in MOH salt <u>precipitating first.</u>

Equation :

MOH (s) ⇄ M⁺ (aq) ₊ OH⁻(aq)

K $sp$ = [M⁺] [OH⁻]

K $sp$ = 1.39×10⁻¹² and [M⁺] = 0.001M

∴ 1.39×10⁻¹² = (0.001M) [OH⁻]

[OH⁻] = 1.004×10⁻¹⁹M

pOH = -log [OH⁻] = 11.9

pH = 14 - pOH

= 14 - 11.9

To learn more about solubility equilibrium ;

https://brainly.in/question/9213521

#SPJ4

8 0

2 years ago