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Understanding Experimental Variables and the Role of Lanthanum in Rare Earth Elements

In any scientific experiment, it’s crucial to manipulate only one experimental variable to obtain reliable results. This principle ensures clear cause-and-effect relationships. For practical application, I plan to use photogates to measure the speed of a car in our lab experiment. Additionally, today we focus on Lanthanum (La), the first of the rare earth elements. Often found in alloys like mischmetal, Lanthanum plays significant roles in various applications, including lighter flints. Despite being termed 'rare', Lanthanum is actually quite abundant.

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Understanding Experimental Variables and the Role of Lanthanum in Rare Earth Elements

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Presentation Transcript

  1. Warm up 2/11/14 • Question: How many experimental variables should you manipulate during an experiment? • Answer: • only one • Goal: I will use the photogates to calculate the speed of the car.

  2. Element of the day • 57 – Lanthanum – La • Lanthanum is the first of the rare earth elements, the two rows at the bottom. These elements aren’t actually that rare, but are found in ores together and are very similar in their properties and are hard to separate – this is where they get their name. • Lanthanum is one of the most abundant rare earth metals – actually more common than lead. • It is found in an alloy called “mischmetal” which is mostly cerium and lanthanum and isn’t in any particular ratio, because it doesn’t really matter. Mischmetal is used in lighter flints and special effects where sparks are needed.

  3. Warm Up • Lab 4A • Course Cards • Tonight’s HW • Lab pg M Agenda / HW

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