Unit 6 Flashcards
(32 cards)
List the 7 signs that a chemical reaction has taken place.
- Temperature change
- Gas evolved (given off)
- Dramatic Color Change
- Formation of a precipitate
- New odor
- Light/sparks
- Sound
What does the symbol (l) mean?
liquid
What does the symbol (aq) mean?
aqueous; substance has been dissolved in water
What does the symbol (ppt) mean?
precipitate
What does the symbol (g) mean?
gas
What does the symbol (s) mean?
solid
What does the symbol → mean?
yields/produces
What does the symbol —△→ mean?
reaction requires heat
What does the symbol —Pt→ mean?
reaction requires a catalyst, in this case platinum
What does the symbol —ele→ mean?
reaction requires electricity
What kind of reaction is this?:
A + B → AB
Synthesis
What kind of reaction is this?:
AB → A + B
Decomposition
What kind of reaction is this?:
A + BC → AC + B
Single Replacement
What kind of reaction is this?:
AB + CD → AD + CB
Double Replacement
What kind of reaction is this?:
CH₄ + O₂ —△→ CO₂ + H₂O
Combustion
What kind of reaction is this?:
HX(acid) + Z(OH)(base) → a salt + H₂O
Neutralization
What kind of element cannot occur alone? It occurs as a pair. There are 7.
Diatomic Element
H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂
What does a decomposition of a metal carbonate produce?
ex. Li₂(CO₃) —△→
It produces a metal oxide and CO₂.
Li₂O +CO₂
What does a decomposition of a metal hydroxide produce?
ex. Ca(OH)₂ —△→
It produces a metal oxide and water—except Group 1.
CaO + H₂O
What does a decomposition of a metal chlorate produce?
ex. 2Li(ClO₃) —△→
It produces a metal chloride and oxygen gas.
2LiCl + 3O₂
What shows just the species that are NOT aqueous ions as products. This is the precipitate.
The net ionic equation.
What are the aqueous ions called? Those ions that do not come together to form a precipitate. (must look at solubility rules for this)
The spectator ions.
What must a combustion reaction always have?
O₂ —△→ CO₂ + H₂O
What must a neutralization reaction always have?
an acid + a base → a salt + water
