Definitions [2]
Define the following terms
Chemical bond
A chemical bond is the force which holds the atoms of a molecule together as in a compound.
Define the following terms:
Effervescence
Formation of gas bubbles in a liquid during a reaction is called effervescence.
Key Points
Key Points: Balancing Chemical Equations
- Law of Conservation of Mass: In a chemical reaction, mass is neither created nor destroyed, so the number of atoms of each element must be equal on both sides.
- A skeletal (unbalanced) equation has unequal atoms of one or more elements on the LHS and RHS.
- Balancing is done using the hit-and-trial method, starting with the compound having the most atoms and balancing hydrogen and oxygen last.
- Only coefficients are changed while balancing; chemical formulas must not be altered.
- A balanced equation may also indicate physical states (s, l, g, aq) and reaction conditions, such as temperature, pressure, or a catalyst.
Concepts [3]
- Conditions Necessary for Chemical Reactions
- Indicators of a Chemical Change (Chemical Reaction)
- Balancing Chemical Equation
