Skill Building Topic 1
UNDERSTANDING THE USES OF NUMBERS
Chemistry is a quantitative science. Theories are based on and supported by measurements and
calculations. Most chemistry experiments involve not only measuring but also a search for the
meaning of

Skill Building Topic 8
THE MOLE
What Is A Mole?
The term mole is classified as a counting number, a number used to specify a certain number
of objects. Pair and dozen are other examples of counting numbers. Seldom does anyone
purchase computer paper by th

Skill Building Topic 10
UNDERSTANDING MASS RELATIONSHIPS IN CHEMICAL
REACTIONS
If the number of atoms is conserved in a chemical reaction, the mass must also be conserved as expected
from the Law of Conservation of Mass. In the equation for the formation

Skill Building Topic 9
A QUANTITATIVE UNDERSTANDING OF FORMULAS
Calculating Percent Composition from a Formula
The percent by mass of each material found in an item is called the elements percent
composition. To find the percent composition of an element

Skill Building Topic 4
SIGNIFICANT FIGURES
As discussed earlier, measurements are an integral part of most chemical experimentation.
However, all measurements have some inherent uncertainty. This uncertainty is a result of
the measurement device as well a

Skill Building Topic 3
PRECISION AND ACCURACY IN MEASUREMENT
Chemistry experiments often require a number of different measurements, and there is always
some error in measurement. How much error depends on several factors, such as the skill of the
experim

Skill Building Topic 5
SCIENTIFIC NOTATION
In chemistry, we deal with very small and very large numbers. It is awkward to use many zeros to
express very large or very small numbers, so scientific notation is used. The number is rewritten
as the product of

Skill Building Topic 2
DIMENSIONAL ANALYSIS
Dimensional analysis, also called the factor-label method, is widely used by scientists to solve a
variety of problems. You have already used this method to convert one type of metric unit to
another. The method

Skill Building Topic 6
UNDERSTANDING AND INTERPRETING GRAPHS AND TABLES
The ability to interpret graphs and tables is a necessary skill in science but also finds use in everyday life.
In articles or textbooks you are likely to find graphs and tables. Unde

Skill Building Topic 7
UNDERSTANDING AND BALANCING EQUATIONS
Equations are the language of chemistry, and they are important in helping us understand how
atoms and molecules form new substances. It has been said many times that chemistry is a
quantitative