Step 7: Measure the Reaction Rate for a partially Broken Tablet
Using a graduated cylinder, fill a 250 ml beaker with 200 mL of water.
Particle size:
Reaction time:
seconds DONE

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.

Decomposition is the cycle at which bacteria breaks down any organic material into the soil

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).