During chemistry lab, Mrs. Black’s studentsplaced an antacid tablet in a zip lock bag.They recorded the mass of the tablet in the bag. Then they carefully added 50 grams of water and quickly sealed the bag. The tablet began to fizz and soon disappeared. The bag was filled with gas and it felt cold to the touch.
What type of change occurred in the bag and how can you support your answer?
A)It is a physical change because the tablet dissolved.
B)It is a physical change as evidenced by change in temperature.
C)It is a chemical change due to the change in temperature and gas production.

Question

During chemistry lab, Mrs. Black’s studentsplaced an antacid tablet in a zip lock bag.They recorded the mass of the tablet in the bag. Then they carefully added 50 grams of water and quickly sealed the bag. The tablet began to fizz and soon disappeared. The bag was filled with gas and it felt cold to the touch.
  What type of change occurred in the bag and how can you support your answer?
A)It is a physical change because the tablet dissolved.	
B)It is a physical change as evidenced by change in temperature.	
C)It is a chemical change due to the change in temperature and gas production.

jadedry · Answer

c)

A physical change is one that involved the /physical/ breaking down of objects, such as a piece of paper being ripped in half.

A chemical change results in change of the chemical composition of the subject. In this case, from a solid powder to a gas. The fact that the bag was cold is further proof of this, it means that the reaction absorbed energy from the environment.