atoms molecules and compounds atoms Atoms make up

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atoms, molecules, and compounds

atoms, molecules, and compounds

atoms • Atoms make up all the different elements • Although atoms make up

atoms • Atoms make up all the different elements • Although atoms make up everything, atoms usually DO NOT exist on their own. Na - Sodium Fe - Iron Both are atoms of different elements but would not be found in nature on their own!

molecules • A MOLECULE is the smallest independent unit of a pure substance •

molecules • A MOLECULE is the smallest independent unit of a pure substance • Composed of two or more atoms of elements put together in a fixed ratio. When only two elements are bound together, it is called a binary compound. Example: 2 hydrogen atoms + 1 oxygen atom = One Molecule of Water (H 20)

-other molecules 1 Carbon atom + 2 Oxygen atoms = One Carbon Dioxide Molecule

-other molecules 1 Carbon atom + 2 Oxygen atoms = One Carbon Dioxide Molecule Carbon atom Written as: C 02 No number means only one of carbon atom Oxygen atom 2 atoms of Oxygen

• Molecules stay linked together even if the substance is melted, boiled, or

• Molecules stay linked together even if the substance is melted, boiled, or frozen

Element and Compounds Worksheet When elements are put together, they will form element molecules

Element and Compounds Worksheet When elements are put together, they will form element molecules or compound molecules. Ex. N 2 (gas) –how Nitrogen gas exists in nature -this is only made of one type of atom (only nitrogen) so it is still considered to be an element Other elements in nature: 02 (oxygen), H 2 (hydrogen gas) (both are considered to be elements because it is only made of one thing!)

How to do the worksheet For each of the following chemicals, identify four things:

How to do the worksheet For each of the following chemicals, identify four things: a. Element or Compound b. Number of elements and their names c. Number of atoms and number of each d. Is it a molecule or not? (molecule/not a molecule)

1. N 2 (nitrogen gas)a. Element (only made of one thing) b. 1 Element;

1. N 2 (nitrogen gas)a. Element (only made of one thing) b. 1 Element; nitrogen c. 2 atoms; 2 nitrogen d. Molecule (two or more atoms) Called a diatomic molecule 9. Na. Cl (salt) a. Compound (made of two different elements) b. 2 elements: Sodium, Chlorine c. 2 atoms; 1 Sodium, 1 Chlorine d. Molecule

13. Cu. SO 4 (Copper (II) Sulphate) a. Compound (made of three elements) b.

13. Cu. SO 4 (Copper (II) Sulphate) a. Compound (made of three elements) b. 3 Element; Copper, Sulfur, Oxygen c. 6 atoms; 1 Copper, 1 Sulfur, 4 Oxygen d. Molecule (two or more atoms) Good Luck!

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