Oxygen<span> is a </span>chemical element<span> having a symbol </span>O<span> and having an </span>atomic number<span> 8.
Oxygen is a pure substance , and it is not a mixture or solution, Niether it is a compound ... Instead , it forms chemical compounds by reacting with other elements.
So , according to above explanation ,
A. A pure substance , is the correct answer.</span>
When a liquid releases enough energy<span>. the </span>liquid<span> freezes, changing to a solid.
Hope this answer helps! feel free to ask any additional questions :)</span>
These would be your answers!
(taken from a source)
Follow the scientific method
Keep detailed records
Communicate experimental results
Hope that helped!
:)
