Chemistry Chapter 1 & 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
- how far off your answer is from the actual answer
- Observed Value/Measured Value
- value obtained through experimentation
- True Value/Actual Value/Accepted Value
- value that's most probable based on many experiments and tests