# Student Essay

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Name: ______________________________________ Date: ________________________ Student Exploration: Boyle’s Law and Charles’ Law Vocabulary: absolute zero, Boyle’s law, Charles’ law, Gay-Lussac’s law, Kelvin scale, pressure Prior Knowledge Question (Do this BEFORE using the Gizmo.) A small helium tank measures about two feet (60 cm) high. Yet it can fill over 50 balloons! How can such a small tank contain enough helium to fill so many balloons? Gizmo Warm-up The Boyle’s Law and Charles’ Law Gizmo™ shows a container of gas. In the container, the small purple spheres represent molecules. 1. Observe the particles. Are they all moving at the same speed? 2. How do the particles interact with 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? B. How does the change in temperature affect the volume of the container? Get the Gizmo ready: Activity A: Boyle’s law  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? 2. Notice: Look at the DESCRIPTION pane. What is the mass of the lid? How much pressure does the lid exert on the gas? 3. Collect data: With the temperature