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In a lab group you combined vinegar and baking soda and observed the results shown in the picture. Choose ALL of the evidence that supports that a chemical change has occurred. Select all that apply. There is no partial credit awarded for this answer.

(1 point)
• A gas is produced.
• The color changed.
• Bubbling occurred.
• The baking soda dissolved.
• There is a change in the composition of the reactants.

1 answer

To determine whether a chemical change has occurred when combining vinegar and baking soda, we can consider the evidence provided in your options. A chemical change is characterized by changes in the composition of substances and the formation of new products. Here are the relevant pieces of evidence for a chemical change:

  1. A gas is produced. - This indicates a chemical reaction as new gases (like carbon dioxide) are formed.
  2. The color changed. - A change in color often signifies a chemical reaction, indicating the formation of new substances.
  3. Bubbling occurred. - Bubbling is a sign of gas release, which typically indicates a chemical reaction occurring.
  4. There is a change in the composition of the reactants. - A change in the overall composition confirms that new products are formed from the original reactants.

The following option does not support a chemical change:

  • The baking soda dissolved. - Dissolving is typically a physical change, not a chemical one.

Based on this analysis, the evidence that supports that a chemical change has occurred includes:

  • A gas is produced.
  • The color changed.
  • Bubbling occurred.
  • There is a change in the composition of the reactants.