Chemistry: Chemical reactions (quiz)
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23 Terms
Chemical Reactions
process by which one or more substances change into one or more new substances.
what is the difference between chemical and physical reaction/change?
A physical change does NOT produce a new substance.
What is the general format for writing a chemical reaction?
Reactants —→ products
Definition of reactants
The substance that participates in a chemical reaction (what it starts with)
Definition of products
The substance that is formed in a chemical reaction
5 Evidence of A Chemical Reaction
1. Formation of a gas
2. Formation of a precipitate
3. Change in odor
4. Color Change
5. Release or absorption of energy
5 Evidence of Release or absorption of energy
1 Release of heat
2 Release of light
3 Production of sound
4 Change in temperature
5 Change of electrical energy
Combustion Reactions
CxHy + O2 --> CO2 + H2O
Synthesis Reactions
A + B --> AB
Decomposition Reactions
AB --> A + B
Displacement Reactions (Single-Displacement)
A + BC --> AC + B
Double-Displacement Reactions
AB + XY --> AY + XB
When is an equation balanced?
the same number of atoms of each element that are present in the reactants must also be present in the products!
Definition of Coefficient
Indicates the number of molecules present.
Definition of Subscript
Indicates the number of atoms present in a molecule.
What does the symbol ‘s’ represent?
Substance in the solid state.
What does the symbol ‘l’ represent?
Substance in the liquid state.
What does the symbol ‘g’ represent?
Substance in the gas state.
What does the symbol ‘aq’ represent?
Substance in aqueous solution (dissolved in water).
what happens when ionic compounds dissolve in water?
the ions separate from one another (dissociate) and spread (diffuse) throughout the solution!
define total ionic equation
When a reaction involves dissolved ionic compounds, it’s more accurate to write the reaction as a total ionic equation
define spectator ions
When two aqueous solutions are mixed, some of the ions in solution react with each other. Others do not react. The ions that do not react are called spectator ions.
define net ionic equations
When the spectator ions are removed from the total ionic equation, the remaining equation shows only the net reaction. This new equation is called the net ionic equation.