2009 Compounds2
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Atoms can combine to form compounds with different properties than the individual elements. A compound consists of two or more elements chemically bonded together. The smallest unit of a compound that retains the properties is a molecule. Chemical formulas use symbols for the elements and subscripts to indicate the number of atoms in a compound or molecule. Some elements exist as diatomic molecules that contain only two identical atoms bonded together.
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2009 Compounds2
- 1. Notes: Compounds CW: Counting Atoms H: Chemical Compounds
- 2. Compounds January 15, 2009
- 3. Objectives Define compound, molecule, chemical formula, diatomic molecule Write and decipher a chemical formula
- 4. Atoms combine together to form most of the substances we observe in the world around us. Compounds - two or more atoms chemically joined together to form a new substance with very different properties than the elements of which it is formed.
- 5. + Sodium + Chlorine = Salt =
- 6. Molecule The smallest piece of a compound is that still has all of the properties of the compound.
- 7. Chemical Formulas: The subscripts to the right of the letters tell you HOW MANY ATOMS of each element. If there isn’t one, it means that there is one atom of that element. H 2 O
- 8. If there is a number in front of the formula, it tells you how many MOLECULES of that substance: 4H 2 O This number is called the coefficient.
- 9. C 6 H 12 O 6 3CO 2 Ba(NO 3 ) 2 2Al 2 (SO 4 ) 3
- 10. diatomic molecule When an element consists of two identical atoms it is called DIATOMIC molecule. O 2 7 elements are always found as diatomic molecules - I odine, H ydrogen, N itrogen, B romine, O xygen, C hlorine, F luorine I H ave N o Br ight O r Cl ever F riends