Answer:
in supernova gold can be turned into lead.
its practical to obtain gold from lead
hope this helps you☺️☺️
A mixture of oil and water is:
Heterogeneous
immiscible
<h3>What type of mixture of oil and water is?</h3>
The water molecules attract each other, and the oil molecules stick together. That causes oil and water to form two separate layers. Water molecules pack closer together, so they sink to the bottom, leaving oil sitting on top of the water. The mixture can be called as Emulsion. It is an immiscible liquid and the mixture is heterogeneous as oil floats on top of water surface but do not mix with it.
Thus, correct options are Heterogeneous and immiscible.
Find more information about Mixture here:
brainly.com/question/498370
They occur between polar molecules
Answer:- The correct answer is B. measuring the height of a building.
Explanations:- Insects and ants are very small. So, meter is not the right unit of measure their length. Their lengths would be measure in mm that is millimeters. So, options A and C are not good.
The distance between two cities is mostly too much so it's measured in kilometers or miles. So, D is also not good.
Height of buildings is measured in meters and so the correct option is B.
Explanation:
Number of oxygen molecules = 10 billion = 
Number of hydrogen molecules = 10 billion = 
Number of molecules of hydrogen peroxides = 10 billion = 
Moles of oxygen gas :

Moles of hydrogen gas :


Moles of hydrogen gas :


Number of moles in hydrogen gas, oxygen gas and hydrogen peroxide is same.
Total number of atoms in
molecules of oxygen:
(2 atoms in 1 molecule)
Total number of atoms in
molecules of hydroegn :
(2 atoms in 1 molecule)
Total number of atoms in
molecules of hydrogen peroxide:
(4 atoms in 1 molecule)
Number of oxygen atoms and number of hydrogen atoms are equal but individually they are not equal to number of atoms in hydrogen peroxide.