P.48

18. An inference is your conclusion about the reaction that occurred.
19.  a. Observation  b. inference c. observation d. observation e. observation f. inference
20. It is important to organize laboratory observations so that when you need to make a conclusion you have all the information you need and you know where to find it.
21. It is important to read an entire investigation before beginning lab work because it saves you from causing any disasters or making any mistakes. There will be specific instructions that will tell you when to put goggles on, and lead you through the guidelines to tell you exactly what you need to do.
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24.  C2H6
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26. Scientific models have limitations because many objects could not be modeled to scale.

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Forever and Always,
Abi