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.

Answer 1

For the questions:

Question 1: a. Deanne and Bo determine that a reaction did take place. When a reaction takes place, atoms must recombine or rearrange.

Question 2: b. The pieces of evidence that helped Deanne and Bo determine that a reaction took place are:

Evidence that was useful to Deanne and Bo:

• A new gas was formed (the bubbles from carbon dioxide).
• An odor changed (the disappearance of the vinegar smell).

Evidence that was not observed or was not useful:

• A solid dissolved in a liquid (while this occurred, it does not indicate that a chemical reaction took place).
• They saw a new color (this was not mentioned in the scenario).

In summary, the formation of gas and the change in odor are key indicators of a chemical reaction.