Answer:
CU
Explanation:
Cu is the correct answer if I'm correct
Answer:

Explanation:
The term used by particular kind of matter is called substance.
A substance is a particular kind of matter because it has physical properties.
Answer:
The answers are A,B,C.
Explanation: Just got it right on Edge 2020
C ........................
Answer is: the third reaction.
Elements in this chemical reaction do not change their oxidation number. Hydrogen has oxydation number +1, sulfur oxidation number is +6, oxygen has oxidation number -2 and barium has +2 on both sides of chemical reaction. In other reactions elements change their oxidation numbers.