Question

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

Answer 1

I think the answer is A- Chemical gas produced 

Answer 2

Answer: A) chemical - gas produced

Explanation: Physical change is a process in which there is no change in chemical composition of the substance.

Chemical change is a process in which there is a change in chemical composition of the substance.

Chemical process is accompanied by following changes

1. Change in color

2. Absorption or release of energy

3. Production of gas

4. Formation of precipitates.

Thus a chemical reaction is happening on mixing baking soda $(NaHCO_3)$ and vinegar $(CH_3COOH)$, there is production of $CO_2$ which expanded the balloon.

$NaHCO_3+CH_3COOH\rightarrow CH_3COONa +CO_2(g)+H_2O$