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Module 1-4 (CHM 1025) Exam 2024 Questions With Completed & Verified Solutions.
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Module 1-4 (CHM 1025) Exam 2024 Questions With Completed & Verified Solutions.
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Module 1-4 (CHM 1025)a measurement is a
- quantitative observation
- comparison to an agreed upon standard
- has a number and unit
what does the unit of measurement tell you
what standards you are comparing your object
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what does the number of measurement tell you
- what multiple of the standard the object measures
- the uncertainty in the measurement
scientific notation
a way of writing large and small numbers
exact numbers
are numbers that can be counted
- example: there exactly 12 donuts in a dozen
these numbers do not have to be guessed or estimated
measured numbers
values that must be obtained by a measuring device
, Significant figures
tell us the precision of a measurement
significant figures rules
- all non-zero digits are significant
-1.5 has 2SF
- interior zeros are significant (sandwich)
-1.05 has 3SF
- trailing zeros after a decimal point are significant
- 1.050 has 4SF
- leading zeros are NOT significant
- 0.001050 has 4SF
- zeros at the end of a number without a written decimal point are ambiguous and should not be
avoided by using significant notation
- if 150 has 2SF, the 1.5010^2, but if 150 has 3 SF, then 1.5010^2
exact numbers has an _________________________ number of significant figures
Unlimited
basic unit of measure
a measures number is formed by a number and a unit
units
tell the standard quantity to which we are comparing the measured property
standard units
- scientists generally report results in an agreed upon international system
- the SI System
- Systeme International
Length
measure of the two-dimensional distance an object covers
mass
measures the amount of matter is present in an object
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