Phase Change: Heat & Changes in State

Master phase changes! Understand heat's role in melting, boiling, and more. Interactive simulation included.

Directions: Use the Ck12 Simulation below to answer the questions within this activity.Optional resource: Ch 15.10 in the Ck12 Flex book textbook Learning Goals ● Explain why the temperature of the substance does not change during a phase change even though heat is continuously added or removed.● Describe the relationship between melting, freezing, condensation, and evaporation.● Recognize that phase change requires energy to be added or removed from the system.● Identify the direct relationship between energy and molecular motion or vibration. Key Concepts Heat and Changes of State, Matter and Change, Physical Change, Heat and Changes of State, Freezing, Boiling, Melting, Condensation, Evaporation 1. Does the temperature of the water rise while it is boiling? 2. What is the relationship between molecular motion and energy? 3. When you boil water, why does the level of liquid decrease? 4. Label each arrow using the following words onto the diagram: melting, freezing, sublimation, deposition, condensation, and evaporation.(Spell each work exactly as they are spelled above with all lower case letters and pay attention to what side of the arrows the label is on.) sublimation deposition freezing melting evaporation condensation 5. Can pure water exist as a liquid at 110°C ? Why or why not? 6. As a change of state takes place, heat _ and temperature _. Increases,stays the same Stays the same, stays the same Stays the same, changes Increases, increases 7. A change of state is a(n) _ process. Irreversible Reversible 8. What is different at the molecular level between a solid and a liquid? (select 2 answers) The type of molecule Strength of intermolecular forces Speed of particles Nothing 9. Which of the below statements are true? There can be a change in heat (kJ) without the temperature changing Heat remains constant through a change of state Temperature changes through a change of state Heat and temperature are the same 10. Rank the states of matter from slowest to fastest particle speed. Gas, solid, liquid Solid, liquid, gas Gas, liquid, solid Solid, gas, liquid 11. When heat is removed from a solid, what happens? The particles move faster The solid becomes a liquid The particles move slower Nothing 12. Describe the movement of solid particles. No movement Vibrational Fast Flowing 13. As the speed of the particles decreases, _. Intermolecular forces become stronger Intermolecular forces become weaker Intermolecular forces do not change Energy increases