When the products of a reaction have a lower enthalpy than the
1) the reaction is endothermic
2)the reaction is exothermic
3) the change in enthalpy is positive
4) the reactants lost internal energy

2) The reaction is exothermic reaction.

Explanation:

An exothermic reaction: A chemical reaction in which the energy is released in the surrounding in the form of either heat or light. The temperature of products in the exothermic reaction is higher than the reactants. Also, the net change in enthalpy is negative.

The exothermic reaction is denoted by:  

Reactants → Product + Energy

The net change in enthalpy is found by taking the difference in energy between the energy used to form product bonds and the energy used to break the reactant bond.

But the energy used to break reactant bond is greater than the energy used to break reactant bond so the net enthalpy in the reaction is negative.

First up write the aim
then write the materials reqd.
then the procedure which you follow
then observation
then conclusion
then you can write lab safety rules or precautions(you can avoid if u want).
lemme' give an example
aim: to observe the double displacement reaction
materials reqd: bacl2 and na2so4, test tubes and a dropper
procedure:
1. take bacl2 in a test tube and na2so4 in the other.
2. then pour bacl2 into na2so4 solution.
3. observe
observation:
you will see that a white precipitate is formed called baso4. along with that common salt or nacl is formed.
the equation is
bacl2+na2so4=baso4+2nacl
conclusion:
a double displacement reaction is observed.
hope it

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