Answer:
A
Explanation:
When molecules speed up, they become excited and create friction that is transformed into heat, do when an abject cools, the molecules slow down and thus for have less friction.
Friction is not useful in Machinery sometimes, Since it leads to the wear and tear of machine parts.
The equation is already balanced
2AgNO3 + MgCl2 => 2AgCl + Mg(NO3)2
Answer:
B
Explanation:
The particles are bound to each other and they vibrate at an almost undetectable rate.
