Change of State (Melting, Boiling, Sublimation) MCQs
Practice Change of State (Melting, Boiling, Sublimation) multiple-choice questions from Matter in Our Surroundings (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Change of State (Melting, Boiling, Sublimation)Quiz - Solve & Score
Q1. An ice carver must just melt a 15 g chip of ice that is already sitting at 0 degrees C into water at the same temperature; what heat input does this need?
- A.33900 J
- B.63 J
- C.5010 J
- D.334 J
Answer: C. 5010 J
Melting at a constant 0 degrees C: Q = m x Lf = 15 x 334 = 5010 J.
Q2. A glass of cola contains 12 g of ice cubes at 0 degrees C that gradually become water at 0 degrees C; what amount of heat do the cubes draw from the drink?
- A.334 J
- B.4008 J
- C.50.4 J
- D.27120 J
Answer: B. 4008 J
Melting at a constant 0 degrees C: Q = m x Lf = 12 x 334 = 4008 J.
Q3. A laboratory demonstration converts 50 g of finely crushed ice at 0 degrees C entirely to water at 0 degrees C; how much energy must be supplied?
- A.16700 J
- B.334 J
- C.113000 J
- D.210 J
Answer: A. 16700 J
Melting at a constant 0 degrees C: Q = m x Lf = 50 x 334 = 16700 J.
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