-<u><em>Oxygen</em></u>
According to Google these are the percentages of the <em>Earths Atmosphere</em>
<em>1</em> 78% - Nitrogen
<u>2</u> 21% - Oxygen
<em>3</em> 0.9% - Argon
<em>4 </em>0.3 - Carbon Dioxide with very small percentage of other elements.
The correct answer would be D: Physical properties can be observed without changing the identity of a substance
Answer:lmk when u have the answer
Explanation:
Answer: Option (d) is the correct answer
Explanation:
The energy present within the bonds of the atoms of a compound or molecule is known as chemical energy.
As this energy is present at a position that is, within the bonds hence it is a potential energy. So, whenever there occurs a chemical reaction the stored chemical energy is released.
As potential energy is the energy possessed because of position of a substance. And, kinetic energy is the energy present due to the motion of an object.
Therefore, we can conclude that chemical energy is a form of potential energy.
You are good enough in general. As long as you know and feel that you are good enough within yourself, you won’t have to worry about meeting anyone else’s expectations. Maybe it’s your mom.. not you.
