States of matter and the particle modelIB MYP Physics: Mind map

Exam questions on States of matter and the particle model

1. Ice cubes are taken from a freezer and left in a glass in a hot kitchen in Dubai. The ice slowly changes to water, and later some of the water disappears from the glass.
   Describe how the arrangement and movement of the particles in the water differ from those in the ice.2 marks
2. A student in Seoul looks at specks of smoke in a sealed glass cell under a microscope. The specks move in random zigzag paths. In another lesson, a teacher opens a bottle of perfume at the front of a still classroom, and after a minute students at the back can smell it.
   Explain why the perfume smell would reach the back of the room more quickly on a warmer day.2 marks
3. A class in Cape Town heats crushed ice gently in a beaker. A thermometer is held in the beaker and the temperature is read every minute. The temperature rises steadily from -8 °C to 0 °C in 4 minutes, stays at 0 °C for 6 minutes while the ice melts, rises steadily to 100 °C over 10 minutes, and then stays at 100 °C while the water boils.
   Explain, using the particle model, why the temperature stays at 0 °C for 6 minutes even though the beaker is still being heated.3 marks