Answer:
room temperature
Explanation:
what i think this is the answer do u know ans
Physical change is the color, shape stuff like that and chemical change is once it’s changed it can’t go back
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.
