30 terms

# Chem: Chapter 1-1 chemistry basics

Vocabulary from Chapter 1

#### Terms in this set (...)

Chemistry
The study of matter and how it changes.
Matter
Anything that has mass and takes up space.
Mass
Amount of matter in an object.
Volume
How much space an object takes up
Chemist
Scientist that studies matter and how it changes
Qualitative
Describing the characteristics of something without using numbers
Quantitative
Describing something using measurements and numbers
Scientific Method
an organized process for investigating the world around us
Hypothesis
A "testable" If, then, because prediction in science
Variable
A condition or a characteristic of matter that is measured or controlled in an experiment.
Independent Variable
a variable that is intentionally changed in an experiment
(manipulated variable)
Dependent Variable
a variable that is measured in an experiment
(response variable)
Theory
A widely accepted hypothesis that has been tested many times which "best explains" and predicts future activities
Technology
The application of science to help people improve their lives.
Scientific Notation
writing or displaying numbers in terms of a decimal number "a" between 1 and 10, multiplied by a power of 10 in the form
"a" x 10ⁿ
Superscript
A number that is written just above the writing line.
Accuracy
How close a measurement is to the correct or accepted value
Precision
how close a measurement is to other measurements of the same thing
Significant Figure
a meaningful digit in a measured value.
Unit
a standard amount used for measuring
Meter
The SI unit for measuring length
Gram
The SI unit for measuring mass
Liter
The SI unit for measuring volume
Kelvin
The SI unit for measuring temperature
Degree Celsius (°C)
A unit for measuring temperature often used in metric measuring
Unit Conversions
The process of changing a measurement from one unit to another.
Conversion Factor
a ratio that shows two units that are equal two one another
Derived Unit
a measurement unit created by multiplying or dividing other units
Density
the mass of a sample matter divided by its volume
2008 NIST SI Units List
The National Institute of Standards and Technology
http://physics.nist.gov/cuu/pdf/sp811.pdf
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