A chemist is asked to determine the concentration of a chemical dissolved
in a solution. The chemist performs the experiment three times for good
measure, and the concentration determined to be 1.74 M, (moles/liter), 1.73
M and 1.75 M. The aver
Problem : How many significant figures are there in the following numbers:
Answers: a: 4, because the number neither begins nor ends with zeros.
B: 3, All are non-zero digits
c: 3, The first three zeros just m
Once again, here is a link to view a full-size periodic table: To see the periodic table, click here. Once the
window appears, roll your mouse over the elements to see their specic information. You can also access
the periodic table by going into the Spar
Prefixes for Units
In addition to the basic metric units described above, there are prefixes to
indicate larger or smaller quantities. For example, a meter refers to a
standard metric measure of length. A millimeter refers to a measure that is
solely on a verbal description. The concept today hasn't changed, although
our standards make better scientific sense and are more exact.
Systems of Units
There are two different sets of units used in scientific measurements: British
Engineering units and
Accuracy - The extent to which an experimental result agrees with a
known or correct value.
British System - A system of units, rather arbitrarily based. It is the
system of units primarily used by the United States. It is not the system of
units used in
In 1789, building upon the work of precursors and contemporaries alike, the French
chemist Antoine Laurent Lavoisier first defined an element as a fundamental substance
that could not be broken down by any chemical means then known. In the same Treatise
Problem : Please express 209.4, .00220, AND .087686 in scientific notation
Defining Significant Figures
No experimental measurement can possibly be perfectly precise. Take, for example, a
wooden stick that is appro
Please notice that the units cancel themselves out. This is very important.
Problem : How many liters are there in a gallon?
There are 4 quarts in a gallon, and 1 L = 1.057 quarts
Problem : What is the height in cm of a 5'6.0' woman?
Known: There are 12 i
For instance, lets say that a person who weighs 150 lbs (a British system
measurement) wants to know her weight in kilograms (a metric system
measurement). Start by drawing a horizontal line, and then making vertical
hash marks to form a table as in step