An ice cube of mass 8.5g is added to a cup of coffee, whose temperature is 95 degrees celcius and which contains 120 g of liquid. assume the specific heat capacity of coffee is the same as that of water. the heat of fusion of the ice (the heat associated with ice melting) is 6.0 kj/mol. find the temperature of the coffee after the ice melts.

Explanation:

Firstly determine heat absorbed by the ice-cube while it is melting:

Now the temperature of the coffee when the ice has melted:

Since both the substances eventually reach thermal equilibrium then they both must have the same final temperature.

By solving this, equation achieved is:

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

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.