Matter
a set of procedures used to develop explanations of natural phenomena and possibly to predict additional phenomena.
scientific method
The mass of one mole of atoms of an element is called its molar ___________.
mass, M
The two main classes of chemical compounds are ________ compounds and ___________compounds.
molecular compounds and ionic compounds.
are processes in which one or more starting substances, the reactants, form one or more new substances, the products.
Chemical reactions
anything that occupies space, possesses mass, and displays inertia
matter
The difference, A-Z is the _______________.
neutron number
A _______________is a symbolic representation of a compound that can be written in several ways.
chemical formula
A chemical reaction can be represented symbolically in a
chemical equation
Properties of matter can be grouped into two broad categories:
physical and chemical
The _______________of an element is a weighted average based on an assigned value of exactly 12 u for the isotope carbon-12.
atomic mass (weight)
are compounds formed by the elements carbon and hydrogen, often together with a few other elements, such as oxygen and nitrogen.
organic compounds
reflects the true quantitative relationships between reactants and products.
balanced equation
describes a quantity of matter
mass
The ____________is an arrangement of the elements in horizontal rows called periods and vertical columns called groups or families.
periodic table
the formula has the smallest integral subscripts possible
empirical formula
An equation is balanced by placing ________________________ before formulas to signify that the total number of each kind of atom is the same on each side of the equation. T
stoichiometric coefficients
The temperature scales used by chemists are the ________________and _____________scales.
Celsius and Kelvin
The elements in groups 3 to 12 are the ___________
transition elements or transition metals
the mass in atomic mass units of a formula unit of an ionic compound
formula mass
comprises quantitative relationships based on atomic and molecular masses, chemical formulas, balanced chemical equations, and related matters.
Stoichiometry