9 Questions
In which state are reactants and products present when they are dissolved in water?
Aqueous solution state
How is the state of aqueous solution indicated in a chemical equation?
(aq)
Which sign is used to indicate the requirement of external heat for a chemical reaction?
(r)
What does the presence of 'Heat' in a chemical equation signify?
Release of heat
Which condition is usually indicated above or below the arrow in a chemical equation?
All of the above
What does the symbol 'Ni Catalyst' represent in a chemical equation?
Presence of nickel as a catalyst
In a word equation, what is typically written below the formulae of reactants or products?
Special information or names
What does 'ZnSO4 (aq) + Cu (s) ZnSO4 (aq) + Cu (s) + Heat' represent?
'Heat' being released
'CaCO3 (s) CaO (s) + CO2': Which type of reaction does this represent?
Decomposition
Study Notes
Chemical Reaction and Equation
- A chemical reaction is a process where substances undergo bond breaking and are transformed into new substances by forming new bonds.
- Reactants are substances taking part in a chemical reaction, while products are substances formed as a result of a chemical reaction.
- A chemical reaction is represented by a chemical equation.
Conventions of Writing a Chemical Equation
- Reactants are written on the left-hand side, and products are written on the right-hand side.
- An arrow is drawn between the reactants and products, indicating the direction of the reaction.
- If there are multiple reactants or products, they are linked with a plus sign (+) in between them.
- The physical states of reactants are indicated in the equation using the letters (g), (l), and (s) for gaseous, liquid, and solid states, respectively.
Types of Chemical Equations
- A word equation is a simple way of representing a chemical reaction in words.
- A chemical equation is a representation of a chemical reaction in a condensed form using chemical formulae.
- Chemical equations can be further modified to indicate the physical states of reactants and products, heat, and conditions required for the reaction.
Examples of Chemical Equations
- CuSO4 + Zn → ZnSO4 + Cu
- CuSO4 (aq) + Zn (s) → ZnSO4 (aq) + Cu (s)
- CaCO3 (s) → CaO (s) + CO2 (heat is required)
- CuSO4 (aq) + Zn (s) → ZnSO4 (aq) + Cu (s) + Heat
- Vegetable oil (l) + H2 (g) → Vanaspathi ghee (s) (at 60°C, with Ni catalyst)
Learn about writing chemical equations by understanding the reactions between copper sulphate (CuSO4) and zinc (Zn) to form copper (Cu) particles and zinc sulphate (ZnSO4). Explore the conventions followed when writing a chemical equation.
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