Question

Need someone to just check my answers please! Will give medal!! How much heat does it take to melt 2.5 kg of lead when it is at its melting point (m.p. = 327.5°C; Hf = 2.04 × 104 J/kg)?

6.2 × 10^1 J

8.2 × 103 J

5.1 × 10^4 J

1.7 × 10^7 J



It takes 2.52 × 10^5 J of heat to melt 4.00 kg of a substance. According to the table, what is the substance?

copper

iron

silver

gold



Which of the following would you use to calculate the heat released when a liquid freezes?

heat of fuheat of vaporization

heat of condensation

heat of solidification

How much heat is required to completely boil away 0.200 kg of water (Hv = 2.26 × 103 kJ/kg)?

4.52 × 10^2 kJ

2.26 × 10^3 kJ

4.52 × 10^3 kJ

1.13 × 10^4 kJ

Answer 1

1. C 2.B 3.D

Answer 2

@roadjester

Answer 3

@petiteme

Answer 4

@wolfe8

Answer 5

@ikram002p

Answer 6

1.C 2.b 3.D

Answer 7

are they correct?