Chapter 1. Skills And Processes Of Chemistry Flashcards
Quantative
Has numbers or quantities associated with it
Qualitative
Describes the qualities or changes in quality of matter including a substances color odour or physical state.
Sources of error
Anything that contributes to making an experiment differ from what was expected. We have no control over them
Model
Something that explains a collection of observations
Law
A general statement of a fact, and some observations to boot
Scientific notation is decided into 2 parts
Mantissa and the ordinate
When you multiply in scientific notation, you do what to the exponents
Add
When you divide in scientific notation, you do what to the exponents
Subtract
Si unit for length
Meter m
Si unit for mass
Kilogram
Si unit for Time
Second
Si unit for electric current
ampere A
Si unit for temperature
Kelvin
Si unit for luminous Intensity
Candela
Si unit for the amount of the substance
Mole
Accuracy
The agreement of s particular value to its true value
Precision
The agreement among several measurements of the same quality
Precision 2
The exactness of the measurement
Systematic error
When a system shows error in the same direction
Random error
When a system shows error equally in high or low directions
Range uncertainty
The acceptable range of values within which the true value of s measurement falls (shows a +/-)
Absolute uncertainty
Exactly how much higher or lower a measured value is than the accepted one.
Percentage error formula
Percentage error= (measured value-accepted value)/100
In percent form
In multiplication, how you determine the sig figs
Only have as much as the one with the least
In addition, how you determine the sig figs
The place value of the last sig fig in the least precise answer.
Example 123.8, 8is the last, so the answer will have 4 sig figs
Kelvin to Celsius
T(k)- 273.15 =T(c)
Celsius to kelvin
Add 273.15
Fahrenheit to celcius
T(c)=(t(f)-32)X1/1.8
Celcius to Fahrenheit
T(f)=1.8X(t(c)) +32
Scientific method
- Observation
- Statement of a hypothesis
- Experimentation
- Statement of a theory
You are trapped in a cold dark room. You have one match, a gas heater, a gas stove, and an oil lamp. You must light them all so you can survive. Which do you light first?
The match… For obvious reasons
