Grade 7 Science quiz on states of water and phase changes with answers.

📚 Quick Study Guide

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• States of Water: Water exists in three states: solid (ice), liquid (water), and gas (water vapor/steam).
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• Melting: The process of solid ice changing into liquid water due to an increase in temperature.
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• Freezing: The process of liquid water changing into solid ice due to a decrease in temperature.
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• Boiling/Evaporation: The process of liquid water changing into gaseous water vapor due to an increase in temperature. Boiling occurs at a specific temperature (100°C or 212°F), while evaporation can occur at any temperature.
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• Condensation: The process of gaseous water vapor changing into liquid water due to a decrease in temperature.
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• Sublimation: The process of solid ice directly changing into gaseous water vapor (without becoming liquid) due to an increase in temperature.
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• Deposition: The process of gaseous water vapor directly changing into solid ice (without becoming liquid) due to a decrease in temperature.

🧪 Practice Quiz

1. What is the process of liquid water changing into ice called?
   1. Melting
   2. Boiling
   3. Freezing
   4. Condensation
2. Which state of water has the lowest kinetic energy of molecules?
   1. Solid
   2. Liquid
   3. Gas
   4. Plasma
3. What is the temperature at which water boils at standard atmospheric pressure?
   1. $0^{\circ}C$
   2. $100^{\circ}C$
   3. $25^{\circ}C$
   4. $-100^{\circ}C$
4. Which of the following is an example of sublimation?
   1. Melting of ice cream
   2. Boiling water
   3. Dry ice turning into gas
   4. Formation of dew
5. What process occurs when water vapor turns into liquid water?
   1. Evaporation
   2. Condensation
   3. Sublimation
   4. Melting
6. During which phase change does water absorb heat from its surroundings?
   1. Freezing
   2. Condensation
   3. Melting
   4. Deposition
7. What is the direct change of water from a gaseous state to a solid state called?
   1. Sublimation
   2. Melting
   3. Evaporation
   4. Deposition