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I read a presentation about this experiment.
Hypothesis: If I add salt to water, then it will take longer for the water to freeze.
The given variables were:
Controlled Variables:
1. Refrigerator
2. type of cups used (contains water and varying amount of salt)
Independent Variable
1. Amount of Salt
Dependent Variable
1. Amount of frozen water
Conclusion: Water with salt take longer to freeze.
Answer: Endothermic reaction
Explanation:
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and for the reaction comes out to be negative.
Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and for the reaction comes out to be positive.
As the energy of reactants is 180 kJ and that of products is 300 kJ, the energy of products is greater than that of reactants, which means the energy has been absorbed and reaction is endothermic.
https://www.britannica.com/science/soap/Raw-materials