A pure chemical compound is a chemical substance that is composed of a particular set of molecules or ions that are chemically bonded.
NO, why though this is a simple question lol!
Explanation:
12)
a) Sodium + oxygen = ?
When sodium reacts oxygen its forms sodium oxide as a product.
b) magnesium + fluorine = ?
When magnesium reacts with fluorine its forms magnesium fluoride as a product.
13)
a) 
Decomposition of mercury(II) oxide on heating gives out mercury and oxygen gas.
b)
The electrolytic decomposition of water gives out hydrogen gas amd oxygen gas.
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.
We are given with a compound, Lithium (Li) having a 4.8x 10 ^24 atoms. We are tasked to solve for it's corresponding grams.Note that 1 mol=6.022x10^{23} atoms and Li has 6.94 g/mol, hence,g Li= 4.8x 10 ^24 atoms x 1 mol/6.022x10^{23} atoms x 6.94 g Li/1mol Li=
55.32 g
Therefore, the grams of Lithium is 55.32 g.
