The correct answer is:
Atoms cannot be created or destroyed by chemical reactions.
Electric field is proportional to the charge and inversely proportional to the square of distance:

With charge 2q and distance 2r, the electric field is proportional to:

The new electric field is half of that of the original measured field.
The answer is hydrogen ions
A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces only exist as a result of an interaction.
Answer:
a machine capable of carrying out a complex series of actions automatically, especially one programmable by a computer.