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# Chem unit 1 (ch 1-5)

What is chemistry? The study of matter and the transformation it undergoes.
Chemical If it has matter and takes up space.
What is diatomic molecules? Always stuck together. (Ex- O2)
Molecular level The behavior of matter
Example of a checmical formula H2O
Example of a structural formula O / \ H H
What’s the scientific method? Method of learning that emphasizes observation and experimentation to understand the world. A continuous creative process by which people learn about the physical universe.
What does scientific method provide? Fundamental foundation for the methods of science.
Steps of the scientific method. 1) observations 2) hypothesis- an educated guess that can be tested 3) experiment 4) model (theory) 5) further experiment
What is a scientific law? A brief statement that synthesizes past observations and predicts future ones.
What is a theory ? A unifying principal that explains what we observe in terms of underlying causes.
Natural law Tells you what
Theory Tells you why
What is 200 years old with experimental evidence to support it including images of atoms? Atomic theory
What are the 2 main types of mathematical problems? 1) unit conversion 2) word problems
Common language The order to communicate across out world we use this for units and equations.
Scientific notation Way of writing large and small numbers.
Large #s Whenever you move your decimal left you multiple by 10
Small #s Whenever you move your decimal over to the right you divide by 10
Measured values Have an uncertainty. For scientific numbers that are measured every digit is certain except the last, which is estimated.
Precision How closed are the dada points to one another
Accuracy How close the measurements to the true value
Exact numbers Do not have any uncertainty with them
Measurements Length (meter in metric) Mass (grams in metric) Volume (liters in metric)
Values that are measured (uncertain at end) 1) all non-zero digits are significant 2) leading zeros aren’t significant 3) if zero is sandwiched between numbers it’s significant 4) end zeros with no decimals are not significant. Significant figures
Multiplication or division Answer will have the same as the fewest of significant figures in calculation.
Addition or subtraction Same number of decimal places as the FEWEST of decimal places. Round down if 4 or less. Round up if 5 or more. (Last digit)
Negative exponent Same as writing unit in denominator.
Created by: Coralebberson