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 indicators

Chemical changes often produce new substances. Gas production is a key indicator.

Step2: Analyze each option

• Option A: Baking soda falling into vinegar is a physical movement, no new substance formed.
• Option B: Mixing is a physical process, no new substance.
• Option C: Dissolving is a physical change (unless a reaction occurs, but here just dissolving).
• Option D: Gas (new substance) produced when vinegar and baking soda are mixed shows a chemical change.

Answer:

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