Answer:
A - matter changes but no other substance is formed.
Explanation:
A physical change is a type of change in which the form of matter is altered but one substance is not transformed into another. Therefore a change of matter is a physical change.
Oxigen ,nitrogen ,carbon,and hydrogen.
Answer: A group that closet matches characteristics
Explanation:
A representative sample is a group that closely matches the characteristics of its population as a whole. In other words, the sample is a fairly accurate reflection of the population from which the sample is drawn.
Bohr models show the number of electrons (regular and valence) which helps determine which sort of should take place.
This is correct!!
