iRubric: DIY Lava Lamp Instruction Poster/iMovie rubric

The poster/iMovie is missing the majority of the steps of the investigation. Significant errors in the arrangement of steps.

The poster/iMovie includes the majority of the steps of the investigation. Slight errors in the arrangement of steps.

The poster/iMovie accurately lists each step of the investigation. No errors in the arrangement of the steps.

¼ fill glass with water
carefully add vegetable oil until glass is near full
add two or three drops of food colouring and observe
add soluble aspirin tablet and observe
discuss ideas about how the lava lamp works

Explanation of the DIY Lava Lamp is incorrect or very basic. Uses phrases such as "sinks down", "bubbles rise", "water and oil don't mix"

Explanation of the DIY Lava is mostly correct with only minor omissions or errors in terminolgy. Uses terminology such as "insoluble", "lighter", "floats on top of", " reaction forms bubbles"

Explanation of the DIY Lava Lamp is comprehensive and accurate. Includes key terminology such as "immiscible" "density",
"suspends", "reaction with water to form CO2"

Oil & Water are immiscible substances. As vegetable oil is less dense it floats on top of the water. Soluble aspirin is a mild acid combined with a mild base which react together when dissolved in H2O forming bubbles of CO2 which float up into the oil, creating the Lava Lamp.