Chemical Reactions 3 - Type of reactions Flashcards
What are chemical equations?
Chemical equations refers to the symbolic representation of chemical changes/reactions.
What are reactants? What are products?
Reactants - Initial substance taken for change to happen
Products - Substance that is formed after a reaction
What is balancing?
In balancing, the number of atoms of each element in the reactants and products should be equal in number.
Why is balancing required?
Balancing is based on the ‘Law of Conservation of Mass’, which states that mass can be neither created nor destroyed/
What is a displacement reaction?
A displacement reaction is a reaction in which a stronger or more reactive metal displaces a less reactive metal from its salt solution.
For example - 2k + CaCl2 -> 2KCl and Ca
What is a double displacement reaction?
A double displacement reaction is a reaction in which metal ions interchange with each others salts is known as a double displacement reaction.
If one of the products formed is an insoluble solid, then it is known as a precipitation reaction.
Precipitation Reaction Example - NaI + AgNO3 = NaNo3 + AgI
How do we know if a compound is a precipitate or not?
All sodium and potassium salts are soluble in water, and hence if they are present in a compound, said compounds can NOT be a precipitate.
What are ionic equations?
Ionic equations are equations representing only the substances which are actively involved in a chemical reaction.
What must we take into account when writing an ionic equation?
In ionic equations, the total charge of the reactants must be equal to the total charge of the products.
What are the ions/substances which don’t take actively take part in a chemical reaction/aren’t represented in an ionic reaction called?
The spectator ion are the ions/substances which don’t take actively take part in a chemical reaction/aren’t represented in an ionic reaction.
