Question

How are following indicated in chemical reaction
1. Evolution of gas
2. Formation of precipitate
3. Evolution or absorption of heat

Answer 1

1)[g]

2)down arrow

3)delta

for more see pic..they r in respective order

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Answer 2

The indications or the symbols for the following in the chemical reaction are shown below:

1. Evolution of gas:

• It is shown or indicated by an arrow headed upwards. The symbol is "↑". This symbol can only be used for gaseous products in the chemical reaction.
• It can also be indicated by "(g)".

2. Formation of a precipitate:

• It is shown or indicated by an arrow that is facing downwards. The symbol is "↓". This symbol can only be used in a chemical reaction when solid forms precipitate during a chemical reaction.
• It can also be indicated by "(s)".

3. Evolution or absorption of heat:

• When there is a change in enthalpy in a chemical reaction it is represented by the symbol "ΔH".
• Change in enthalpy can be either evolution of heat from the system to the surroundings or absorption of heat into the system. "Δ" represents a change in the system due to heat, and "H" is for heat.