Answer:
Subatomic particles making up an atom 
Explanation:
Atom is the smallest unit of any matter 
An atom consists of three subatomic particles - Protons, Neutrons, Electrons. Major atomic mass is in the nucleus ie a tiny deep area at the centre. Nucleus consists nucleons, which includes protons (positively charge) & neurons (neutrally charged). Negatively charged electrons are outside the central nucleus. 
 
        
             
        
        
        
True! 
 Energy released by system is absorbed by surroundings.
        
             
        
        
        
It tends to in increase because the size of the atoms increase. 
        
             
        
        
        
Gravity is the force of motion pulling down objects to the ground. If there was no gravity, everyone would walking as if they were on the moon. 
Mass is what gravity needs. If an object has a little amount of mass, gravity will be able to easily bring it to the ground. 
If an object has a very huge amount of mass, gravity will still be able to bring it to the ground but it will be hard. 
For example: An airplane has a HUGE amount of mass. Gravity pulls it down but the airplane needs to be steering up in order for it to be straight. Gravity is applied on the airplane when it is landing. 
BUT..... if a table is in the way of an object it depends if it will fall down to the ground or stay on the table. 
If an object has little mass and a table is in the way of gravity pulling it down to the ground, the object will stay on the table. Like a plate of food on a table. 
If an object has a very big amount of mass and a table is in the way of gravity pulling it to the ground, the object will break the object and make it's make to the ground. That is mostly why most of the time people have very strong tables/ anything to hold a heavy object.  
Another example is if you're lifting weights and you have little amount of mass, you're most likely to get the little sized weight. It depend on you mass. 
Here are some pictures I included here as well of Mass and gravity. 
Glad to help! :) :D 
 
        
        
        
Answer:
Mostly Para
Explanation:
First, let's assume that the molecule is the toluene (A benzene with a methyl group as radical).
Now the nitration reaction is a reaction in which the nitric acid in presence of sulfuric acid, react with the benzene molecule, to introduce the nitro group into the molecule. The nitro group is a relative strong deactiviting group and is metha director, so, further reactions that occur will be in the metha position.
Now, in this case, the methyl group is a weak activating group in the molecule of benzene, and is always ortho and para director for the simple fact that this molecule (The methyl group) is a donor of electrons instead of atracting group of electrons. Therefore for these two reasons, when the nitration occurs,it will go to the ortho or para position.
Now which position will prefer to go? it's true it can go either ortho or para, however, let's use the steric hindrance principle. Although the methyl group it's not a very voluminous and big molecule, it still exerts a little steric hindrance, and the nitro group would rather go to a position where no molecule is present so it can attach easily. It's like you have two doors that lead to the same place, but in one door you have a kid in the middle and the other door is free to go, you'll rather pass by the door which is free instead of the door with the kid in the middle even though you can pass for that door too. Same thing happens here. Therefore the correct option will be mostly para.