In a reaction, a gas being produced is a physical change a chemical change a phase change no change

When a comet collides with earth, it adds material to our planet and causes great damage. therefore, a collision like this is a a. destructive force b. constructive force c. geologic process and event d. constructive and destructive force

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

Asolid that forms and separates from a liquid mixture is called