a shorthand way of writing the name of an element
a group of atoms; the smallest part of a compound that can exist and still have the properties of the compound
the smallest part of an element that can exist and still have the properties of the element
an atom with a charge; An ion can be positive or negative depending on whether it lost or received electrons.
the dense central core of an atom. The nucleus contains protons and neutrons.
the number of protons in the nucleus of an atom
protons and electrons
There are the same number of these in an atom
Neutrons and Protons
These are found in the nucleus of the atom
Writing chemical symbols
All chemical symbols begin with a capital letter. If there are two letters, the second one is lower case
a short way to write the name of a compound
show how many atoms of each element are in a molecule of a compound
charge of a proton
charge of an electron
charge of a neutron
formed when atoms share electrons in their bond
formed when an atom gives up or gains an electron. The opposite charge holds the atoms together.
Atoms form bonds so they will have eight electrons in their outer shell
bonding of noble gases
Noble gases do not form bonds because their outer electron shell is full.
electrons found in the outer electron shell. These are the only electrons involved in a chemical reaction
law of conservation of Mass
Matter can not be created or destroyed. It can only change forms.
Three kinds of chemical reactions
Synthesis, Decomposition, and Replacement
Be able to tell by looking at a chemical equation whether it is a synthesis, decomposition, or replacement reaction. Refer to your handout sheet on this information. Your textbook also has an example of each in lesson three.
Examples of chemical indicators
litmus paper, cabbage juice, pH paper
Signs of a chemical change
a gas is produced, there is a color change, heat or light is given off, a change in odor, a solid precipitate forms
In the presence of an indicator an acid will turn the indicator what color?
In the presence of an indicator a base will turn an indicator what Color?
blue or green depending on the indicator
I will give you a chart with missing information. You will have to fill out this information: Atomic number, atomic mass, #of protons, # of neutrons, # of electrons. I will give enough information to fill in the missing numbers, but you will need to know the rules.
Rules of atomic math - atomic number
The atomic number is the same as the number of protons, or the number of electrons. All three of these numbers are the same. Ex. Atomic number is 10 then you will have 10 electrons and 10 protons.
Rules of Atomic math - atomic mass
The atomic mass is equal to the number of protons plus the number of neutrons. Example: There are 4 protons and 6 neutrons. The atomic mass will be 10.
Rules of Atomic math - neutrons
To find the number of neutrons, subtract the atomic number form the atomic mass
I will give you an example of a square from the Periodic Table. You will need to label in information presented in the square. Refer to a Periodic Table or your notes for this.
Draw an atom
Given a square from a Periodic Table, you must draw the atom. Have you read the document on my teacher page about electron shell capacity? Know how to find how many electrons are in a shell.
Know how to count the number of atoms in a compound. This should be in your notes.
Balancing chemical equations
You will have to balance five equations on this test. Review form the websites I have provided for you on my teacher page.