4 because he needed to see
I think the correct answer from the choices listed above is option D. the substances cobalt and barium chloride will not react since cobalt os less active than barium so it does not have enough energy to displace barium in the compound. Hope this answers the question.
The correct answer is C - sound.
Sound is a wave, and it is thus not considered a form of matter.
Answer:
1. trigonal-planar
Explanation:
NO3- (nitrate) has three domains around it and each oxygen pushes against each other creating a planar structure.
