Answer:
Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.
Explanation:
Answer:C
Explanation:
Mass energy of hydrogen fusing into helium
F = M*A
200N*10KG is 2000 newtons
so 2000 newton's is the normal force that is being exerted on the block
