20. Which of the following material s would show the smallest temperature change

Question

20. Which of the following material s would show the smallest temperature change upon gaining 200.0 J of heat? a. 50.0 grams water (specific heat capacity of water 4.184mg b. 50.0 grams iron (specific heat capacity of iron 0.449 J/(g C c. 50.0 grams granite (specific heat capacity of granite 0.79 JOgoC)) 50.0 grams lead (Pb) (specific heat capacity of Pb 0.128J e. 50.0 grams silver (Ag) (specific heat capacity of Ag 0.235 Ji(g 21. If you triple the amount of reactants and products in an exoth reaction, you triple the heat the reaction produces. a. True b. False

Explanation / Answer

Ans 20 a) 50.0 grams of water (specific heat capacity of water 4.184 J/(goC)

Heat absorbed or released can be given as :

Q = m. c. delta T

where Q is heat

m is mass

c is the specific heat

delta T = change in temperature

Since rest all other values are constant , only the specific heat is different.

The substance with the highest specific heat will show the lowest temperature rise.

So the substance with smallest temperature change will be water as it has highest specific heat.

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