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CHEMISTRY CHAPTER 1

Terms in this set (22)

Science is a
framework for gaining and organizing knowledge
The scientific method is
the process used to gather and interpret information
scientific laws
are statements that describe things that are consistently and reproducibly observed
Hypothesis
a tentative explanation (educated guess) that is based on presently known facts
Theory
an experimentally tested explanation (model) of an observed behavior
Chemistry is
the study of matter and how it interacts with other matter and/or energy
Matter is
anything that has mass and occupies space
physical properties
characteristics that can be determined without changing the chemical composition of matter (what its made of)
Energy is
the ability to do work and transfer heat
2 forms energy is found in
a) potential energy (stored energy)
b) kinetic energy (energy of motion)
Energy required formula
Q = s x c x ΔT
Measurement
number and a unit
When you move the decimal to the left
exponent is positive
when you move the decimal point to the right
exponent is negative
Accuracy is
related to how close a measured value is to a true value
precision is
measure of reproducibility
SIGFIGS: If decimal point is present
count all numbers from the left starting with the first non zero number
SIGFIGS: If decimal point is absent
count all numbers from the right starting from the first non zero number
SIGFIGS: multiplication/division
answer= same # of least amount of sigfigs
SIGFIGS: addition/subtraction
answer= same least decimal place value
conversion factor
relationship between two units
metric units
Giga, Mega, Kilo Hecto Deca Base Deci Centi Milli
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