1)      How much energy would be required to melt 15.0 g of water at 0 oC?  
 
 
2)      A sample of water with a mass of 75g undergoes a temperature change from 32oC to 9 oC. What is the heat change in Joules?
 
 
 
 
3)      A sample of Aluminum with a mass of 326.0g undergoes a temperature change from 96oC to 32 oC. What is the heat change in Joules? 
(Specific heat capacity of Al =0.900 J/g*oC)
 
 
 
 
4)      How much energy would it take to boil 36.0 g of water at 100 oC?
 
 
 
 
1)      Top of Form
2)      Bottom of Form
5)      A sample of Copper with a mass of 83g undergoes a temperature change from 80oC to 49 oC. What is the heat change in Joules?
 
 
 
6)      Calculate the energy released as 48 grams of water freezes.
 
 
 
7)      Calculate the energy required as 55 grams of water boils (vaporizes).
 
 
 
 
 
8) Calculate the energy released as 860 grams of water to condense.
 
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answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

i think that the answer is c

the correct answer is c