Chemistry I Chapter 2 Outline
MEASUREMENTS AND CALCULATIONS
For graded assessments, you will need to be familiar with the following
terms:
Scientific method, system, hypothesis, model, theory, quantity, SI (international
standard), weight, volume, density, conversion factor, dimensional analysis,
accuracy, precision, percentage error, significant figures, scientific notation, &
directly proportional/inversely proportional.
I.
SCIENTIFIC METHOD
A. What do chemists study? Page 29.
B. Hypotheses are often drafted as _________________________
statements.
C. Distinguish between controls and variables in an experimental test.
Page 30.
D. Regarding the scientific method, be familiar with the flow chart on
page 31; figure 3.
ii.
UNITS OF MEASUREMENT
A. Why do scientists conform to the SI system of unit measurement?
B. Be familiar with table 1 on page 34 regarding units of
measurement and their corresponding parameters. You can
disregard the last two units of measurement as they are beyond
the scope of this course: electric current and luminous intensity.
These are physics subject material and will not be covered in
Chemistry I.
C. Distinguish the measurements weight and mass.
D. Be familiar with the information given on page 36, table 3 .
E. Take notes on the section concerning conversion factors. This is
very important in both science and mathematics.
III.
USING SCIENTIFIC MEASUREMENTS
A. Understand the difference between the two measurements used to
verify the efficiency of a scientific experiment. Refer to page 44 and
figure 8 to understand the difference between accuracy and precision.
B. The accuracy of an individual value or of an average experimental
value can be compared quantitatively with the correct/accepted value
by calculating a percentage error:
Percent error = experimental value – accepted value X 100%
accepted value
When a percent error is negative, is the experimental value greater
than or less than the accepted value? When the percent error is
positive, is the experimental value greater than or less than the
accepted value?
C. In measurement and when considering significant digits, which digit
is the most uncertain and why is it important to report this digit?
D. Be familiar with table 5 on page 47 concerning significant zeros.
These rules are important in the chemistry lab when taking
measurements. Significant figures allow scientists to understand the
degree of measurement for what is being examined.
E. Be familiar with table 6 on page 48 concerning rounding numbers
with decimals.
F. Be familiar with all information on page 49 concerning rules for
addition/subtraction and multiplication/division of significant figures.
G. Rigorously understand scientific notation. Look over pages 50 –
51.
H. In class, we will discuss and practice the difference between
inverse and direct proportionality. Rigorously take notes. This is
important in understanding scientific parameters.
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Chemistry Chapter 2 Outline