2.3 Elements and Compounds Flashcards

Front

a pure substance that cannot be separated into simpler substances by physical or chemical means.

Back

element

Front

consists of one or two letters; the first letter is always capitalized, and the remaining letter is always lowercase.

Back

chemical symbol

ex: Na for sodium

Front

organizes the elements into a grid of horizontal rows called periods and vertical columns called groups or families.

Back

The periodic table

Front

Elements that have similar chemical and physical properties. The are the columns on the periodic table.

Back

groups (aka Families)

Front

Why is the periodic table called 'periodic'?

Back

The table is called periodic because the pattern of similar properties repeats from period to period.

Front

a substance made up of two or more different elements that are combined chemically in a fixed ratio.

Back

compound

Front

can be broken down into simpler substances by chemical means, often requiring external energy such as heat or electricity.

Back

compound

Front

What is electrolysis?

Back

the chemical change of water into its component elements—hydrogen and oxygen—by using an electric current.

Front

What is the chemical formula for water?

Back

Water is composed of two parts hydrogen (H) and one part oxygen (O), and its chemical formula is H2O.

Front

What is the chemical formula for table salt?

Back

Table salt, which is called sodium chloride, is composed of one part sodium (Na) and one part chlorine (Cl), and its chemical formula is NaCl.