# Chemistry Chapter 1 &amp; 2

## Terms

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What is science?
the search for facts about the world around us
Pure Science
search for a better understanding of the world; curious scientists
Applied Science
practical application of scientific discoveries; scientists who put discoveries to work
Scientific Method
the way a scientist solves a problem
What are the steps in the Scientific Method?
State a problem; Collecting observations or data; Searching for scientific laws; Form a hypothesis; Forming theories; Modifying theories
Controlled Experiments
experiments were only one variable is changed at a time
How do Scientists make sense of their data?
graphs; practice
Direct Graph
1 goes up; the other goes up
Inverse Graph
1 goes up; 1 goes down
Quantity
a term for things that can be measured; length, mass, time, etc.
SI Unit for length
meter m
SI Unit for mass
kilogram kg
SI Unit for time
second s
SI Unit for amount of substance
mole mol
SI Unit for temperature
Kelvin K
SI Unit for electric current
Ampere A
SI Unit for luminous intensity
candela cd
SI Unit for energy
Joule J
SI derived unit for volume
cubic meter m³
SI derived unit for speed
meter/second m/s
SI derived unit for force
Newton kg·m/s²
Accuracy
getting close to the actual target
Precision
getting the same value over and over again
Significant Figures
the digits in a measurement that are known to certainty and one digit that is uncertain.
How many sig figs in 3.00?
3
How many sig figs in 20?
1
How many sig figs in 0.004?
1
How many sig figs in 400000.0254000?
13
When you multiply or divide the number with the ___ number of sig figs detaermines the number of sig figs in the answer.
least
SI derived unit for area
square meter m²
When adding and subtracting line up decimals and round off at the number farthest ot the ___ under a full column.
right
Percent Error