Question

in class, a science teacher demonstrates what happens when vinegar and baking soda are combined. two students, jada and terrell, disagree about the type of change that occurred when the vinegar and baking soda were mixed. jada believes that the change is an example of a chemical change.
what observational evidence can jada use to support her argument that the change is chemical?
a the baking soda falls into the vinegar in step 2.
b the baking soda mixes with the vinegar in step 2.
c the baking soda dissolves in the vinegar in step 3.
d the balloon fills with a gas produced when the vinegar and baking soda are mixed.

Explanation:

Step1: Recall chemical change evidence

A chemical change often produces a gas, precipitate, etc.

Step2: Analyze each option

• Option A: Baking soda falling into vinegar is a physical action (mixing), not evidence of a chemical change.
• Option B: Mixing is a physical process, not proof of a chemical change.
• Option C: Dissolving can be a physical change (like salt in water).
• Option D: Gas production (balloon filling) is a common sign of a chemical change (vinegar - baking soda reaction produces carbon dioxide).

Answer:

D. The balloon fills with a gas produced when the vinegar and baking soda are mixed.