Chapter 7 Exam Review.docx - Chapter 7 Exam Review 1 What...

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Chapter 7 Exam Review 1. What must break in order for water to change from solid to liquid to gas? Hydrogen bonds between water molecules Covalent bonds between water molecules Hydrogen bonds within water molecules Ionic bonds within water molecules Covalent bonds within water molecules 2. How much heat energy is needed to melt 1 gram of ice? 8 calories of heat energy 80 calories of heat energy 800 calories of heat energy 8000 calories of heat energy 3. Why does temperature NOT initially increase as energy is added after ice begins to melt? The added energy is used to break hydrogen bonds between water molecules. The added energy is used to form hydrogen bonds within water molecules. The added energy is used to form hydrogen bonds between water molecules. The added energy is used to break hydrogen bonds within water molecules. 4. What physically breaks hydrogen bonds between water molecules as ice melts? The movement of water molecules Covalent bonds of water molecules The polarity of water molecules The mass of water molecules 5. What do we call the energy used to melt ice once the ice becomes water?
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Latent heat of condensation Latent heat of vaporization Latent heat of fusion Latent heat of melting 6. How much heat energy is needed to turn 1 gram of water at 100 degrees Celsius into water vapor? 5.4 calories of heat energy 54 calories of heat energy 540 calories of heat energy 5400 calories of heat energy 7. How can water vapor become ice? Water vapor can become liquid water through the release of heat energy, and then become ice through the release of more heat energy. Water vapor cannot become ice directly through the release of heat energy.
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