When Solid Pellets of Sodium Hydroxide (NaOH) Dissolve in Water $\Delta$

question 29

Multiple Choice

When solid pellets of sodium hydroxide (NaOH) dissolve in water, the temperature of the water can rise dramatically.Taking NaOH as the system, what can you deduce about the signs of the entropy change of the system ( $\Delta$ S_sys) and surroundings ( $\Delta$ S_surr) from this?

• A)(\(\Delta\)S_sys is less than 0 and \(\Delta\)S_surr is less than 0.)
• B)(\(\Delta\)S_sys is less than 0 and \(\Delta\)S_surr is greater than 0.)
• C)(\(\Delta\)S_sys is greater than 0 and \(\Delta\)S_surr is less than 0.)
• D)(\(\Delta\)S_sys is greater than 0 and \(\Delta\)S_surr is greater than 0.)
• E)Nothing can be deduced from this limited information.

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Definitions:

Object Permanence

Recognition that objects removed from sight still exist, as demonstrated in young children by continued pursuit.

Infants

Very young children, especially those under one year of age, characterized by rapid developmental changes.

Menarche

The occurrence of the first menstrual period in adolescent girls, marking the onset of puberty.

Pregnant

The state in which a woman carries a developing fetus within her uterus.