8th Grade Science Guide

8.1: Chemistry 3 Dimensions & Progressions

Unit 2

Objective

Overview

Materials

● The Temperature and Particle Motion Gizmo demonstrates the relationship between the temperature of a gas and the motion of its particles. A sample of moving particles is shown on the left side of the Gizmo, and the corresponding Maxwell-Boltzmann distribution is shown on the right. Students can change the temperature and the gas that is shown.

● Gizmo - Temperature & Particle Motion

● I can explain the relationship between temperature and particle motion.

Formative Assessment: SEEd 8.1.5 Formative Assessment

8.1.5 Phenomena Assessment: Rubbing Alcohol & Water

Objective

Overview

Materials

● I can relate the amount of energy added or taken away from a substance to the motion of molecules in the substance by developing a model to illustrate the relationships in particle motion relationships between temperature, density, and state of matter.

● Alcohol and Ice

● Ice ● Rubbing alcohol ● Tall clear containers

Phenomena: Have clear plastic cups that are taller and thinner. Have them already poured approximately ¼ full with rubbing alcohol. Don’t tell the students what is in the cup. Have about 1/3 cup of small ice pieces in another cup. Students pick up both materials. Have them predict what will happen when the ice is poured into the liquid. (In this case the ice will sink). Have them describe what happened and why. Then have them continue to watch through the side of the cup. As the ice melts, the water will go to the bottom and create a