1. A soluble salt, MX 2, is added to water in a beaker. The equation for the dis

Question

1. A soluble salt, MX2,   is added to water in a beaker. The equation for the dissolving of the salt is:

A. Immediately after the salt dissolves is the solution warmer or colder? Explain.

B. Indicate the direction of the heat flow, in or out of the beaker, while the salt dissolves.

C. After the salt dissolves and the water returns to room temperature, what is the value of q for the system?

2. A styrofoam cup calorimeter has a calorimete constant of 2.3 J/degrees C. A 3.50 g sample of zinc heated to 95.4 degrees C was dropped into 50.0 g of water at 20.7 degrees C (the specific heat of water is 4.484 J/g x degrees C) in the calorimeter. The temperature of the water rose to 21.2 degrees C. Calculate the specific heat, s, of zinc.

Explanation / Answer

A. Immediately after the salt dissolves is the solution warmer or colder? Explain.

it will becom colder, since H>0, meaning it is endothermic, that is, will absorb heat and lower T

B. Indicate the direction of the heat flow, in or out of the beaker, while the salt dissolves.

Heat flows from surroindings to system... into the beaker

C. After the salt dissolves and the water returns to room temperature, what is the value of q for the system?

Q = - since it cools down, once again, via surrouding.

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