Answer:
exothermic reaction
Explanation:
If there is a drop in temperature, then energy was lost to the surroundings because temperature is the average measure of kinetic energy. An exothermic reaction would result in this lost of energy. An endothermic reaction would absorb energy and make the temperature rise.
Answer:
Halogens family
Explanation:
Be familiar with the periodic table
Answer:
40/220 ×100=18.6 is all I got I know that by heart so um yea
Explanation:
The correct formula for hydrogen gas is H2
