Answer:
o The result of a chemical change is a different composition; in a physical change, the composition remains the same.
Explanation:
In a chemical change, new kinds of matter are produced although the atoms are the same.
For physical changes, no new kinds of matter formed. Only the state of substances changes.
- Most chemical changes are usually irreversible
- Physical changes are reversible in most parts.
- Changes in state and form are salient characteristics of physical changes.
- When new products are formed from the reactants, it is an indicator of a chemical change.
Mass number = no. of protons + no. of neutrons
so, it would be, 3+4 = 7
D. is the right answer because his pressure is very bad out there in the air.
good luck
Answer:
i would say a) two playlists
hope this helps!
Explanation:
Motion energy is the sum of potential and kinetic energy in an object that is used to do work.
