Answer:
physical change because even though gas formation was observed the water was undergoing a state change which means that it's original properties are preserved
Complete Question:
The complete question is on the first uploaded image
Answer:
The solution is on the second uploaded image
Explanation:
The explanation of the above solution is on the third uploaded image.
The elements helium neon and Exon are all part of the same _______ on the periodic table.
B. Group
Answer:
Halogens family
Explanation:
Be familiar with the periodic table