Deanne and Bo conduct an experiment at school. They put vinegar into a dish, and then they add baking soda to it. Lots of bubbles form as they stir the two substances together. After the bubbling stops, they notice that they no longer smell the distinctive odor of vinegar. Their teacher explains that the atoms making the vinegar and the atoms making the baking soda were recombined to form water, carbon dioxide, and another compound called sodium acetate.(2 points)

Question

a. Deanne and Bo determine that a reaction
take place. When a reaction takes place, atoms must
.
Question 2
b. Which of the following pieces of evidence helped Deanne and Bo answer question a?(2 points)
evidence that was useful to Deanne and Bo evidence that was not observed or was not useful
A solid dissolved in a liquid.

A new gas was formed.

An odor changed.

They saw a new color.

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Answer 1

Question 1:

a. Deanne and Bo determine that a reaction did take place. When a reaction takes place, atoms must recombine or rearrange.

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Question 2:

b. The following pieces of evidence helped Deanne and Bo answer question a:

Evidence that was useful to Deanne and Bo:

• A new gas was formed. (The bubbles indicate the formation of carbon dioxide gas.)
• An odor changed. (The disappearance of the vinegar smell indicates a reaction has occurred.)

Evidence that was not observed or was not useful:

• A solid dissolved in a liquid. (This may occur in the mixing process and does not indicate a chemical reaction.)
• They saw a new color. (There is no mention of a color change in the scenario, so this evidence would not apply here.)

Overall, the formation of gas and the change in odor provided the most significant evidence for the reaction that took place.