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Topic 1 – Matter and Energy

6. Phase changes: Recalling phase change terms and equations

1. Which term refers to a change of a substance from solid to liquid?
1) Freezing 2) Condensation 3) Evaporation 4) Fusion
2. Which term is correct for a change of water from steam to liquid?
1) Sublimation 2) Condensation 3) Evaporation 4) Fusion
3. When a substance evaporates, it is changing from
1) Liquid to gas 2) Gas to liquid 3) Solid to gas 4) Gas to solid

4. Which equation is showing sublimation of iodine? 3) I2 (s) --------------------> I2(l)
1) I2(g) --------------------- -> I2(s)

2) I2(s) ---------------------> I2(g) 4) I2(g) --------------------> I2(l)
5. Which phase change correctly shows condensation of water?
1) H2O (g) ----------------> H2O (l) 3) H2O (s) -----------------> H2O (l)
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2) H2O (l) ----------------> H2O (s) 4) H2O (s) -----------------> H2O (g)

6. Which equation represents fusion of water?
1) H2O (g) ------------------> H2O (l) 3) H2O (s) -----------------> H2O (l)

2) H2O (l) ---------------> H2O (s) 4) H2O (s) -----------------> H2O (g)

7. The change NH3(g) --------> NH3(s) is best described as 3) Condensation

1) Sublimation

2) Evaporation 4) Deposition

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