Gold has 79 protons on the periodic table
Answer:
Explanation:
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In this case, according to the described chemical reaction, it is possible to compute the theoretical mass of silver as mass via the 1:2 mole ratio of copper to silver and their atomic mass in the periodic table, in order to perform the following stoichiometric setup:
Next, given the actual yield of 120 g, we compute the percent yield via:
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Answer:
A. Water in the blue currents is colder, saltier, and denser than water
in the red currents.
Explanation:
a p e x
Moles of NH₃ : = 7.059
<h3>Further explanation</h3>
Given
120 g NH₃
Required
moles NH₃
Solution
The mole is the number of particles contained in a substance
<em>1 mol = 6.02.10²³
</em>
Moles can also be determined from the amount of substance mass and its molar mass
Mol = mass : Molar mass
So for 120 g (molar mass of NH₃ = 17 g/mol) :
= 120 g : 17 g/mol
= 7.059
Answer:
Option C= light is emitted as electron falls from the excited state to the ground state releasing a photon.
Explanation:
Electrons are responsible for the production of colored light.
Electron:
The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.
Symbol= e-
Mass= 9.10938356×10⁻³¹ Kg
It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.
How electrons produce the colored light:
Excitation:
When the energy is provided to the atom the electrons by absorbing the energy jump to the higher energy levels. This process is called excitation. The amount of energy absorbed by the electron is exactly equal to the energy difference of orbits.
De-excitation:
When the excited electron fall back to the lower energy levels the energy is released in the form of radiations. this energy is exactly equal to the energy difference between the orbits. The characteristics bright colors are due to the these emitted radiations. These emitted radiations can be seen if they are fall in the visible region of spectrum.
