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# Boyle’s Law and Charles’s Law

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The Boyle’s Law and Charles’s Law Gizmo shows a container of gas. Inside, small purple spheres represent gas molecules. 1. Observe the particles. Are they all moving at the same speed? No, the ... particles are moving at different speeds. 2. How do the particles interact with the walls and lid of the container? The particles bounce off the walls and lid of the container. These interactions contribute to the pressure on the walls of the container. Pressure is defined as force per unit area. The SI units of pressure are newtons per square meter (N/m2), or pascals (Pa). 3. Slowly drag the temperature (T) slider back and forth. (Note: In this Gizmo, the Kelvin scale is used to measure temperature. On the Kelvin scale, 0 degrees is absolute zero, the coldest possible temperature. Absolute zero is equal to -273.15 °C or -459.67 °F) A. How does the change in temperature affect the speed of the molecules? On average, the molecules move faster. B. How does the change in temperature affect the volume of the container? As the temperature rises, the volume of the container increases. Activity A: Boyle’s law Get the Gizmo ready:  Set the temperature (T) to 300 K.  Check that the mass (m) is set to 0 kg. Question: How does pressure affect the volume of a gas? 1. Form hypothesis: In this experiment, you will pile weights on the lid of the container of gas. What do you think will happen as more weight is added to the lid? Hypotheses will vary. 2. Notice: Look at the DESCRIPTION pane. What is the mass of the lid? 10 kg [Show More]

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