Answer:
When you rub a balloon on your head, electrons move from the atoms and molecules in your hair onto the balloon.
Explanation:
Electrons have a negative charge, so the balloon becomes negatively charged, and your hair is left with a positive charge.
A/a physical change is when an object goes through a natural change such as weather etc.
B/ the different is that 1) chemical change is more quick to change rather than physical (ex: I’d there is rocks flying around and is wearing down another rock it would take longer rather than acid)
Because they cannot survive long outside a living host cell.
Answer:
if you mix any halogen with any alkali then ionic salt will be formed and also this will cause an exothermic reaction in which heat is getting released
