I would say C. petroleum
A is wrong
B is impractical for "mainly used"
D thats too expensive
1 mole ------------- 6.02 x 10²³ atoms
( moles Cu) ------- 1.48 x 10²⁵ atoms
moles Cu = ( 1.48 x 10²⁵ ) x 1 / 6.02 x 10²³
moles Cu = 1.48 x 10²⁵ / 6.02 x 10²³
=<span> 24.58 moles of Cu</span>
<span>hope this helps!</span>
Answer : The correct option is, electrons are not shared equally between atoms.
Explanation :
Polar covalent bond : It is a type of chemical bond in which a pair of electrons are not shared equally between the two atoms.
In polar covalent bond, the electrons are not shared equally because one atom spends more time with the electrons than the another atom. In this, one atom has more tendency to pull an electron than the other atom.
For example : is an example of polar covalent bond. In water molecule, oxygen spends more time with the electron than the hydrogen and oxygen carries a partial negative charge.
Higher the concentration, the faster the reaction would occur thus higher the rate because there would be more amount of reactants for the reaction to occur and more particles would frequently collide to produce the products quickly.
I believe what you are trying to ask here is the balanced chemical reaction. We first identify the chemical formula of the substances.
Lead(II) sulfide = PbS
Oxygen = O2
Lead(II) oxide = PbO
Sulfur dioxide = SO2
The balanced chemical reaction is written as:
PbS + 3/2O2 = PbO + SO2