When solid sodium hydroxide (NaOH) pellets are dissolved in water, the temperatu

Question

When solid sodium hydroxide (NaOH) pellets are dissolved in water, the temperature of the water and beaker rises. This is an example of a. an exothermic process b. an endothermic process. c. a combustion reaction d. a thermodynamic cycle. e. all solvation processes. What is the change in internal energy (Delta E) when a system is heated with 35 J of energy while it does 15 J of work? a. +50 J b. +20 J c. -20 J d. -50 J e. +35 K A pot of water is heated with 10 J of energy at constant pressure. What is the enthalpy change (Delta H) for this process? a. -10 J b. > 10 J c. +10 J d.

Explanation / Answer

30)

Since temperature rises, the reaction must have given out heatnwhich is absorbed by container and water

Hence it is exothermic reaction

Answer: a

31)

q = 35J

w = -15 J

E = q+w

= 35-15

= 20 J

Answer: b

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