Atoms , Elements, & Chemical Symbols

Protons in carnon nucleus

6

Protons in oxygen nucleus ?

8

What is abchemical equation

A way to describe what goes on in a chemical reaction, the actual change in a material * has to be equal on both sides

What is a chemical symbol

An abbreviation of an of an element ( * on the periodic table

Chemical reaction summary ?

Bonds break, the elements rearrange, and form new bonds with each other

How do elements differ

By how many protons are in their nucleus

Chemical symbol for hydrogen ?

H

Nucleus

Has protons & neutrons

If only one Atom of an element is present in the molecule no subscript is used

If more than one atom of an element is used than the symbol is followed by a number indicating how many Adams are used this is called the subscript

Materials on the left of the arrow are the reactants, or materials that are going to react

Materials on the right of the arrow our products, or materials that have been produced by the reaction

Reactants ?

Molecules at the beginning of the reaction

Products?

Molecules at the end of the reaction

Chemical symbol for nitrogen ?

N

Chemical symbol for sodium ?

Na

Chemical symbol for oxygen ?

O

Another word for reactants?

Substrates

What is the chemical formula ?

The combination of symbols that represent a particular molecule Ex. Water molecule H20 2 hydrogen Atoms One oxygen Atom

Chemical equation example ;

Water 2H2 + O2 > 2H2O * no new molecules are created

What is a chemical bond ?

When Atoms share electrons in their orbits

How do molecules form?

When two atoms bond together