Question

How much heat is required to solidify 2.0 kg of liquid copper?

(see table attached inside!)

A. - 4.1 × 10^5 J

B. - 1.0 × 10^5 J

C. 1.0 × 10^5 J

D. 4.1 × 10^5 J
*thank you:)

Answer 1

the requested amount Q of heat is given by the subsequent formula:
\[\Large Q = Cm\]
where:
C= 2.05*10^5 J/Kg
Furthermore, since we are dealing with the solidification process, of our sample of copper, then we have to consider Q as a negative quantity, because the heat left the sample of copper

Answer 2

okay! so 2.05*10^5 * 2 = 410000 and you said it is negative? so would our answer be choice A? - 4.1 * 10^5 J ?

Answer 3

yes! That's right!

Answer 4

woo! thank you:D

Answer 5

thank you!! :D