Compounds Notes Part 2
Compound
Matter that is made up of two or more elements (atoms)
CHEMICALLY combined.
Molecule
The molecule is the smallest unit of a ____compound_____.
Compound facts:
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•
•
•
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The elements that make up a compound lose their original properties.
A compound has different properties than the elements that make it up.
Energy is always involved when a compound is broken up or put together.
lt takes a chemical reaction to make or break up a compound.
The ratio of the elements that make up a compound are always the same for
that compound.
Example: water is always 2 hydrogen atoms and 1 oxygen atom.
Parts of a compound:
CO2
= carbon dioxide
subscript
(How many atoms are present)
*When there is no subscript written, it is assumed that the subscript is 1
What is the chemical name for the following compounds?
sugar
salt
calcium carbonate
water
1. H2O
water
2. NaCl __salt _________________
3. CaCO3___calcium carbonate_____
silicon dioxide
carbon dioxide
4. CO2 ______carbon dioxide_________
5. SiO2__silicon dioxide_______
6. C6H12O6_____sugar________
Identify each of the following as E(element) or (compound)
__C___ water
__ C__ carbon dioxide
_ C_ vinegar
__ E__ oxygen
__ E___ sodium
__ C__ salt
__ E__ calcium
__ C__ baking soda
_ E___ carbon
__ E__hydrogen
__ C__hydrogen peroxide
_ E___ helium
True or false:
F
1. Compounds are made up of only one type of atom.
F
2. Compounds can be found on the periodic table.
T
3. Subscripts are used in compounds to determine the number of atoms
in the compound.
T
4. The atoms in a compound are chemically bonded together.
F
5. The properties of the compound are the same as the properties of the
elements that make it up.
F
6. The ratios of the elements that make up a compound can change and you
would still have the same compound.
DIRECTIONS: Cut apart the facts and glue them into the appropriate part of the diagram.
ELEMENTS
COMPOUNDS
BOTH
Type of matter
Essential for life
Found in nature
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Made from just one type of atom
Has a chemical symbol
Smallest part is an atom
Found on the Periodic Table
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Smallest part is a molecule
Has a chemical formula
Takes on new properties when it is formed
Formed through a chemical reaction
Made from more than one type of atom
Made from just one type of atom
Found on the Periodic Table
Made from more than one type of atom
Essential for life
Formed through a chemical reaction
Found in nature
Has a chemical symbol
Has a chemical formula
Type of matter
Takes on new properties when it is formed
Smallest part is an atom
Smallest part is a molecule