Chemistry Midterm part 1
Terms
undefined, object
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- Define qualitative data
- consist of descriptive terms
- Define quantitative data
- consists of measurements
- What measurement system do all scientists use?
- SI system
- Measurements for mass, length, time, and amt. subst.
- kilogram (kg), meter (m), seconds (s), mole (mol)
- one piece of data is called
- datum
- list the prefixes
- mega-, kilo-, hecto-, deka-, deci-, centi-, milli-, micro-, nan-, pico-, femto-
- Kelvin is an ...
- absolute scale (all molecular motion would stop at 0K)
- Convert K into C
- K+273=C
- Convert C to F
- 9/5(C)+32
- Convert F to C
- (F-32)5/9
- Cominations of SI units are called...
- Derived SI units
- the tool to convert measurements is called...
- dimensional analysis or factor-label method
- Inexact numbers are numbers...
- obtained by measurement.
- Define Precision
- Precision refers to how close a series of measurements are to one another.
- Define Accuracy
- Accuracy refers to how closely individual measurements are to a true or accepted value.
- Sigfigs rule for zeros
-
between nonzeros = important
at the end and before a decimal point = important - Sigfigs rule for multiplying and dividing
- the answer has as many sigfigs as the measurement with the least # of sigfigs
- Sigfig rule for addition and subtraction
- answer has as many digits after the decimal point as the measurement with the fewest number of digits after the decimal point