CHM 121 Chapter Notes - Chapter 1: Fahrenheit, Picometre, Bugatti Veyron
7 Jun 2018
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1.1: The Scientific Method in a Chemical Context
● Observation: systematic recording of natural phenomena and may be qualitative,
descriptive in nature, or quantitative, involving measurements
● A hypothesis is a possible explanation for the observation developed based upon facts
collected from previous experiments as well as scientific knowledge and intuition
a. May not be correct, but it must be testable with an experiment
● An experiment is a procedure for testing the hypothesis
a. Most useful when they are performed in a controlled manner, meaning that only
one variable is changed at a time while all others remain constant
● Peptides: molecules that consist of molecules called amino acids linked together in a
chain
● Molecular models: simplified versions of the way atoms are connected and reveal their
three-dimensional arrangement
1.2 Experimentation and Measurement
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● The diameter of a sodium atom, 0.000000000372m = 3.72 10 −10 = 372
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Document Summary
1. 1: the scientific method in a chemical context. Observation: systematic recording of natural phenomena and may be qualitative, descriptive in nature, or quantitative, involving measurements. A hypothesis is a possible explanation for the observation developed based upon facts collected from previous experiments as well as scientific knowledge and intuition: may not be correct, but it must be testable with an experiment. An experiment is a procedure for testing the hypothesis: most useful when they are performed in a controlled manner, meaning that only one variable is changed at a time while all others remain constant. Peptides: molecules that consist of molecules called amino acids linked together in a chain. Molecular models: simplified versions of the way atoms are connected and reveal their three-dimensional arrangement. The diameter of a sodium atom, 0. 000000000372m = 3. 72 (cid:1876) 10 10(cid:1865)= 372 (cid:1868)(cid:1865) The distance from the earth to the sun, 150,000,000,000 m = 1. 5 (cid:1876) 10 11 = 150 (cid:1833)(cid:1865)
