Chemistry worksheet focusing on phase changes, freezing and melting points, and temperature conversions.

Here are the answers to complete your worksheet.

1. The 4 States of Matter (Chart)

| State | Has definite volume? | Takes the shape of its container? | Hot enough to lose its electrons? |
| :--- | :--- | :--- | :--- |
| Solid | Yes | No | No |
| Liquid | Yes | Yes | No |
| Gas | No | Yes | No |
| Plasma | No | Yes | Yes |

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2. Phase Change Diagram

Here are the names for the arrows connecting the states:

* Solid $\rightarrow$ Liquid: Melting
* Liquid $\rightarrow$ Solid: Freezing
* Liquid $\rightarrow$ Gas: Vaporization (or Boiling/Evaporation)
* Gas $\rightarrow$ Liquid: Condensation
* Solid $\rightarrow$ Gas: Sublimation
* Gas $\rightarrow$ Solid: Deposition

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3. Centigrade and Fahrenheit temperatures to memorize

i. Freezing point of water:
* $0^\circ\text{C}$
* $32^\circ\text{F}$

ii. Standard room temperature:
* $20^\circ\text{C}$ or $25^\circ\text{C}$ (depending on your textbook, usually 20-25)
* $68^\circ\text{F}$ or $77^\circ\text{F}$

iii. Normal body temperature:
* $37^\circ\text{C}$
* $98.6^\circ\text{F}$ (often rounded to $98^\circ\text{F}$ or $99^\circ\text{F}$ in class)

iv. Boiling point of water:
* $100^\circ\text{C}$
* $212^\circ\text{F}$

v. Absolute zero:
* $-273^\circ\text{C}$ (precisely $-273.15$)
* $-459^\circ\text{F}$ (precisely $-459.67$)

vi. Freezing point of mercury:
* $-39^\circ\text{C}$
* $-38^\circ\text{F}$ (approx $-37.9$)