Question

Ms. Crawford gave the following instructions to her science class:

• Place an empty water bottle on the table and remove the lid. Carefully pour 10 ml of vinegar into the bottle.

• Open up the mouth of the balloon and have you lab partner spoon 1 teaspoon of baking soda into the balloon.

• Without spilling any of the baking soda, stretch the mouth of the balloon over the mouth of the bottle.

• Turn the balloon completely upright so that the baking soda inside the balloon pours into the bottle with the vinegar. Watch!

The baking soda looked like it dissolved in the vinegar. Sarah and Connor watched as the balloon expanded and filled with a gas. Was this a physical or chemical reaction and why?

A) chemical - gas produced

B) physical - water bottle got hot

C) physical - baking soda dissolved

D) chemical - baking soda disappeared


PLZ HELP

Answer 1

Answer: chemical - gas is evolved

When vinegar and baking soda are first mixed together, hydrogen ions in the vinegar react with the sodium and bicarbonate ions in the baking soda. The result of this initial reaction is two new chemicals: carbonic acid and sodium acetate. The second reaction is a decomposition reaction. In this decomposition reaction carbonic acid decomposes to form carbon dioxide and water