Final answer:
The unknown mixture contains gelatin and baking soda, which is a component of baking powder. To determine which two substances an unknown mixture contains, we can use the information given about gelatin, baking powder, baking soda, and corn starch.
Step-by-step explanation:
The unknown mixture contains gelatin and baking soda.
Baking powder is a mixture of sodium bicarbonate (baking soda) and a solid acid. When baking powder reacts with moisture, it produces carbon dioxide gas, which causes bread to rise. Gelatin, on the other hand, is a protein derived from collagen.
Based on the provided excerpts discussing chemical reactions and components of baking powder, the two substances in the unknown mixture are likely to be baking powder, which includes baking soda, as no evidence supports the presence of gelatin, corn starch, or salt.
To determine which two substances an unknown mixture contains, we can use the information given about gelatin, baking powder, baking soda, and corn starch. The excerpt mentions a reaction where baking powder is used to produce carbon dioxide, which is essential in baking for the fluffiness of the final product. Baking powder consists of sodium bicarbonate (which is also known as baking soda) and a solid acid like sodium aluminum sulfate or potassium hydrogen tartrate. On the other hand, gelatin is a different substance entirely and is not part of this reaction.
Therefore, based on the given information about the properties of baking powder and the absence of information that connects gelatin, corn starch, or salt directly to the provided chemical reactions or descriptions, it is reasonable to conclude that the unknown mixture could likely be baking powder (which includes baking soda as a component) and none of the other substances listed.