Green Unit (5) Flashcards
(26 cards)
5 signs of a chemical reactions
Color change
Gas production
Precipitate forms
Light/heat produced
Odor produced
Exothermic
Reaction that releases energy as heat
Endothermic
Reaction that absorbs energy as heat
Individual atom
Atom
Covalent substance
Molecule
**includes diatomic molecules
Ionic substance
Unit
2 or more reactants combine to form a single product
Synthesis
Only one product
Synthesis
A + B -> AB
Synthesis
A single reactant breaks down into 2 or more products
Decomposition
AB -> A + B
Decomposition
A single element replaces another in a compound
- cation replaces cation
- anion replaces anion
Single replacement
A + BC -> B + AC
Single replacement
Reactants: one element and one compound
Single replacement
Single element must be more active (higher on the activity series)
Single replacement
Double replacement rule
One product must be insoluble
Change of partners
Double replacement
AB + CD -> AD + CB
Double replacement
Reactant: 2 compounds
Double replacement
Must form a precipitate
Double replacement
What happens in combustion
A hydrocarbon burns in oxygen to produce carbon dioxide and water
CHO + O2 -> CO2 + H2O
Combustion
One reactant is O2
Combustion
Heat is given off
Combustion
