Quizzed Content Flashcards
Recall the indicators of a chemical change
The indicators of a chemical change are:
- Colour change
- Evolution of gas
- Formation of a precipitate
- Temperature change
State the law of conservation of mass
The law of conservation of mass states that matter cannot be created nor destroyed. Particles can only be rearranged
Apply the law of conservation of mass to chemical reactions
As mass is conserved, the mass of the reactants is equal to the mass of the products
Define synthesis
A chemical reaction where simpler components form a more complex compound
Recall what type of chemical reaction tends to be exothermic. Why?
Synthesis tends to be exothermic as chemical bonds are formed, releasing energy
Recall what type of chemical reaction tends to be endothermic. Why?
Decomposition tends to be endothermic as chemical bonds are broken, using energy
Define decomposition
A chemical reaction where a more complex compound breaks down into simpler components
Recall the details of the formation of salt in a neutralisation reaction
The base ‘supplies’ the cation
The acid ‘supplies’ the anion
Recall what the limewater tests for
The limewater tests for the presence of carbon dioxide
Acid + Base –>
Acid + Base –> Salt + Water
Recall what ions are soluble
All group 1 ions are soluble
Define spectator ion
An ion that does not actively participate in the reaction
Recall the types of combustion
Combustion can be:
- Complete
- Incomplete
Define combustion
A reaction that releases thermal energy through the reaction between a reactant and oxygen
Define precipitate
An insoluble mass
