science

compound, atom

A ________ is a type of molecule. A molecule is formed when two or more ______ are combined.

solution

Ionic compounds, or salts, such as sodium chloride are made of ions and the ions separate in water to form a _______.

small

All molecules are to ______ to be seen.

molecules

Atoms combine in predictabel ways to form ________.

hydrogen and hydroxide

Common ions are _____ and _______.

single

Diatomic molecules can be made from a _________ element.

Compounds, including salts (which are ionic) are made from atoms of two or more different elements. The characteristics of compounds are different from the elements that they are made from. For example at room temperature, water is a nonflammable liquid, but hydrogen and oxygen are both flammable gases.

How are compounds different from the elements from which they are formed?

Ionic compounds can break up or dissociate into ions when placed in water. This forms a solution. Common ions are the hydrogen ion and the hydroxide ion.

How can ionic compounds break into pieces?

The periodic table can be used to predict how atoms will combine into molecules.

How can you predict how atoms will combine to form a molecule?

negative

If an atom gives electrons away it becomes a _______ ion.

compound, diatomic

If the two atoms are different, a _______ is formed. If the two atoms are the same, they form a _______ molecule such as O2.

molecule

In solutions, _______ can dissociate into ions.

sodium , chloride

Ionic compounds, or salts, such as _____ and _______ are made of ions.

different

Molecular compounds have characteristics that are ________ than the elements they are made from.

crystals

Molecular structure determines the shape of _______ that are formed.

multiple

Salts, compounds, and ionic molecules are made of _______ elements.

periodic table

The _____ _____ helps predict how atoms will interact to form molecules.

ions

The individual _____ are too small to be seen in the water, but they are still there.

dissociation, assoicate

The separation of ions is called _______. The ions no longer _______ with each other.

Different combinations of atoms form all of the substances in the world. Atoms can combine to form molecules. Molecules can be made of atoms of the same element (an element) or they can be made from two or more atoms of different elements.

What are molecules made of and what are their properties?

compound

a chemical combination of two or more elements.

element

a pure substance that cannot be broken down into simpler substance by chemical reaction

crystal

a solid material made up of molecules that are arranged in repeating patterns.

ion

atoms that have fewer or more electrons than protons.

ionic bonding

bonding between two atoms that takes place because one atom has donated one or more elctrons to the other.

ionic componds

elements on the left of the periodic table tend to form right with elements on the right of the periodic table.

ionic compound

that are made of charged atoms or groups of atoms.

periodic table

the chart scientist use to organize and classify all the known elements.

atom

the smalled unit of an element that has the properites of that element.

molecule

two or more atoms joined together