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repository:phase_changes [2020/09/15 17:05] porcaro1 |
repository:phase_changes [2020/09/29 17:03] porcaro1 [Answer Key] |
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| - If a gas is super heated to thousands of Kelvin, it ionizes and becomes __**plasma**__. | - If a gas is super heated to thousands of Kelvin, it ionizes and becomes __**plasma**__. | ||
| - Increases in __**temperature**__ result in greater particle velocity and therefore greater kinetic energy. | - Increases in __**temperature**__ result in greater particle velocity and therefore greater kinetic energy. | ||
| - | - The Kinetic Theory of Matter says that for hotter temperatures, the %%_____%% of the particles move in matter. | + | - The Kinetic Theory of Matter says that for hotter temperatures, the __**more**__ of the particles move in matter. |
| + | |||
| + | ==Pre-Coding Questions Part 2== | ||
| + | - {{:repository:heating_curve.jpg?nolink&600|}} | ||
| + | - The first plateau is where the matter melts (goes from solid to liquid) or freezes (goes from liquid to solid). Likewise, the second plateau is where the matter boils/vaporizes (goes from liquid to gas) or condenses (goes from gas to liquid) | ||
| + | - See graph and previous answer | ||
| + | - 273.1 K (0 °C) | ||
| + | - 373.1 K (100 °C) | ||
| + | - The graph accurately models the changes between the solid, liquid, and gas phases of water, but does not include the process of ionization | ||
| + | - The first plateau is longer than the second. This indicates that the heat capacity of liquid water is higher than the heat capacity of steam. This means that water is more efficient and carrying heat; it requires more energy to change its temperature in the liquid phase versus the gaseous phase | ||
| + | |||
| + | ==Post-Coding Questions== | ||
| + | - No. We know kinetic energy is equal to $\dfrac{1}{2}mv^2$. Rearranging for velocity, we find $v=\sqrt{\dfrac{2KE}{m}}$. Therefore, for the same energy level, more mass results in less velocity. | ||
| + | - $Q=mc\Delta T$ and $Q=mL$ | ||
| + | - The mass, specific heat capacities, latent heat of fusion, latent heat of vaporization will not change. Energy input is an independent variable and temperature of the substance is a dependent variable. | ||
| + | - We can show different heating curves for different substances by changing the parameters defined in lines 56-62 (specific heat capacities, latent heat of fusion, melting point, etc.) | ||
| + | - Here are some examples:{{:repository:heating_curves.jpg?nolink&600|}} | ||
| + | - If the model occurred at 2 atmospheres of pressure, the melting/freezing point would lower and the boiling/condensing point would increase. We can look at a [[https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Physical_Properties_of_Matter/States_of_Matter/Phase_Transitions/Phase_Diagrams#:~:text=Phase%20diagram%20is%20a%20graphical,diagram%2C%20a%20phase%20change%20occurs. | phase diagram]] to see how pressure affects change of state for different substances. One equation that relates pressure, temperature, and volume is the ideal gas law: $PV=nRT$ (note that this only applies to gases) | ||
| ===Code=== | ===Code=== | ||
| [[https://trinket.io/glowscript/2f3f50f661?showInstructions=true | Link]] | [[https://trinket.io/glowscript/2f3f50f661?showInstructions=true | Link]] | ||