Achemist carefully measures the amount of heat needed to raise the temperature of a 894.0 g sample of a pure substance from -5.8c to 17.5c. the experiment shows that 4.90kjs of heat are needed. what can the chemist report for the specific heat capacity of the substance? (round your answer to 3 significant digits.)

Answer : The specific heat of substance is

Explanation :

Formula used :

or,

where,

Q = heat needed = 4.90 kJ  = 4900 J

m = mass of sample = 894.0 g

c = specific heat of substance = ?

= initial temperature  =

= final temperature  =

Now put all the given value in the above formula, we get:

Therefore, the specific heat of substance is

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pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation: