Classifying Matter

a molecule is the smallest part of...

a substance

a mixture of iron and sulfur can be separated by

magnetic attraction

compounds are formed as a result of

chemical combination

the ratio of hydrogen atoms to sulfur atoms in sulfuric acid, H2SO4 is

2 to 1

salad dressing is an example of a (homogeneous) mixture

heterogeneous

the simplest type of a substance is a (compound)

element

when elements form to make compounds, their properties (do not) change

do

the chemical (symbol) for water is H2O

formula

substances in a (mixture) keep their own properties

true

the substances in a (heterogeneous) mixture can usually be seen and are easily spread

true

describe the basic particle from which all elements are made

atoms

how are elements and compounds related?

elements bond together chemically to make compounds. A compound can be broken down into pure elements.

what is the difference between a chemical symbol and chemical formula?

a chemical symbol designates an element that belongs to the periodic table.
a chemical formula combines two or more symbols and it represents a chemical compound.

what are two ways in which mixtures differ from compounds?

A mixture consists of multiple compounds rather than the compound which consists of different elements. A mixture can be separated more easily into its components.

atom

the basic particle of any element

chemical bond

the force of attraction between two atoms

molecule

a group of 2 or more atoms held together by chemical bonds

element

a substance that cannot be broken down into any other substance

chemical formula

shows the elements and ratio of atoms in a compound

compound

a substance made of 2 or more elements chemically combined in a set ratio

mixture

2 or more substances together in the same place but not chemically combined