Question

In which step(s) did a chemical change most likely occur?

A) Investigation A, Step 1 and Investigation B, Step 1
B) Investigation A, Step 2 and Investigation B, Step 2
C) Investigation A, Step 2 only
D) Investigation B, Step 2 only

Answer 1

A chemical change most likely occurred in Investigation A, Step 2 and Investigation B, Step 2 due to the production of a gas and the formation of a precipitate, respectively, which are both indicators of chemical reactions.

Step-by-step explanation:

To determine in which step(s) a chemical change most likely occurred, we should look for evidence of a substance being transformed into another substance. Key observations that indicate a chemical change include a color change, temperature change, light production, formation of bubbles, and formation of a precipitate.

Investigation A, Step 2, and Investigation B, Step 2 are the steps where a chemical change most likely occurred. This is because, in Investigation A, Step 2, a gas is produced, which often results from a chemical reaction. Similarly, in Investigation B, Step 2, the formation of a precipitate is evidence of a chemical reaction, since it indicates the creation of a new substance. Therefore, the correct answer is B) Investigation A, Step 2 and Investigation B, Step 2.