8th Grade Science Guide

8.1: Chemistry 3 Dimensions & Progressions

Unit 2

temperature, density, and state of matter.

discovered about liquids also apply to solids.

Activity: Phase Change Diagram - Pure 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.

● Students will make a phase change of water graph. They will begin with ice at freezer temperature and then

● Vernier temperature probes or thermometer, stirring rod, beaker, ice, hot plate ● Graph paper or digital graph

continually add heat while stirring. Temperature will be recorded every minute and graphed. They will label the states of matter on the graph as well as the phase changes. Water will be continually heated until boiling is reached. Note: with the ice, no hot plate needed. Room temperature is enough to melt the ice for a few minutes and then heat will need to be added to get it to boiling.

Activity: Phase Change Diagram - Salt 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.

● In this lab students will determine the Phase Diagram for salt water. They will start with a

● Ring stand, test tube, test tube clamp, alcohol

burner, salt water, ice, thermometer, stirring rod, matches

mixture of salt water and ice and proceed to turn the solution into a gas. Along the way students will record the temperature and then graph the data to develop