A 30. g sample of Aluminum was heated to 40. 0C and placed in a calorimeter containing 50. g of water at 21 0C. What is the final temperature of the aluminum-water system if the cAl = 0.21 cal/g0C and cwater = 1.0 cal/ g 0C. Write the complete equation you will use. 1 point

Substitute the values in the equation in step 1 . 1 point

Report the math answer with 2 sig figs and the correct unit. 1 point

The final temperature will be

Explanation:

Calculating the heat released or absorbed for the process:

In a system, the total amount of heat released is equal to the total amount of heat absorbed.

    OR

          ......(1)

where,

= specific heat of aluminium =

= heat capacity of water =

= mass of aluminium = 30. g

= mass of water = 50. g

= final temperature of the system = ?

= initial temperature of aluminium =

= initial temperature of the water =

Putting values in equation 1, we get:

Hence, the final temperature will be

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

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