Chemistry Test II Topics and Study Guide
What you need to know…
Where you can find it…
- The atom [Notes-Handout]
Know the parts of an atom
(protons, electrons and
nucleus) including knowing
the location of each part
and the electrical charges
of protons and electrons.
- Chemical building blocks pp. 29-31, 78-83 [Homework]
- Drawing atoms [Classwork-Handout]
- Labeling an atom [Classwork-Handout]
- Parts of an atom review [Classwork-Handout]
- Atoms and electrical charge [Classwork-Handout]
- Atom matching [Classwork-Handout]
- Atom and molecule review [Homework]
- Atom definition [Notes-Handout]
Know the difference
between an atom and a
molecule.
- Chemical formulas: Part of water (H2O) [Notes-Handout]
- Atoms vs. molecules: Models [Classwork-Handout]
- Atom/molecule 4-square notes [Classwork-Handout]
- Atom and molecule review [Homework]
Read and write a chemical
formula.
- Chemical formulas: Parts of water (H2O) [Notes-Handout]
- Identifying elements in chemical formulas [Classwork-Handout]
- Atoms vs. molecules: Chemical formulas [Homework]
- Using chemical formulas to draw molecules [Homework]
Recognize a diagram/model
as being an atom or a
molecule.
- Atoms vs. molecules: Models [Classwork-Handout]
Recognize a diagram/model
as being an element or a
compound.
- Elements vs. compounds: Models [Classwork-Handout]
- Atom and molecule review [Homework]
- Atom and molecule review [Homework]
Recognize chemical formulas - Identifying atoms, molecules, compounds and elements in chemical
formulas [Classwork-Handout]
as being an atom or a
molecule.
- Atoms vs. molecules: Chemical formulas [Homework]
Recognize chemical formulas - Identifying atoms, molecules, compounds and elements in chemical
formulas [Classwork-Handout]
as being an element or a
compound.
- Atoms vs. molecules: Chemical formulas [Homework]
***I have extra of all of these materials. See me if you are missing anything.***
Question: How do I know if a particle diagram is showing an atom
or a molecule?
Answer: I count the nuclei! One nucleus equals one atom. More than
one nucleus equals a molecule!
For example:
The above picture only has one
nucleus, so it’s one atom.
The above picture has two
nuclei, so it’s a molecule.
Question: How do I know if a chemical formula is indicating an
atom or a molecule?
Answer: I add up the subscripts! If your answer adds up to one,
then it’s an atom. If it adds up to more than one, it’s a molecule.
Remember, if there is no subscript after a symbol, it means there
is one atom of that element. We say He, not He1.
For example:
F = 1 atom of fluorine
F2 = 1 molecule of fluorine made of 2 atoms
Na2PO3F = 1 molecule of sodium monofluorophosphate made of 2
sodium atoms, one phosphorous atom, 3 oxygen atoms, and 1
fluorine atom.
Question: How do I know if a particle diagram is showing an
element or a compound?
Answer: I see if the atoms are different. If there are different
atoms in a molecule, then it is a compound. If the atoms of a
molecule are all the same, it is an element. (Note: An atom all by
itself is always an element.)
For example:
O2
MgO
In the above picture, the atoms
In the above picture, the atoms
are the same, so it is an element. are different, so it is a compound.
Question: How do I know if a chemical formula is indicating an
element or a compound?
Answer: I count the capital letters in the formula! Each capital
letter indicates a different element. A chemical formula which only
has one capital letter is an element. A chemical formula which has
more than one capital letter is a compound.
For example:
F = an element (fluorine) because there is only one capital letter
F2 = an element (still fluorine) because there is still only one capital letter
Na2PO3F = a compound because there are four capital letters, so
there are four elements combined