TEKS Science: 5.5A-B, 6.5A, 6.5B
Students will be able to draw/identify a model that represents matter in three states – solid, liquid, gas.
Students will be able to use correct terminology to describe the phase changes of matter (melting, freezing, evaporating, boiling, condensing) and be able to identify the sequence of phase changes with water.
Students will be able explain the temperature conditions (Celsius and Fahrenheit) for water to boil or freeze.
Students will be able to predict the effect on a substance’s state of matter when heat energy is increased or decreased.
Students will be able to relate the phases of matter to the relative energy level of the particles.
Students will be able to identify characteristic properties of substances that remain constant.
Students will be able to classify the effects of electrical charges at the molecular level: like charges repel and opposite charges attract.
Students will be able to read the scale on a thermometer.
Students will be able to explain why water particles behave they way they do when heat energy is increased/decreased.
This lesson takes the concepts developed in previous class periods regarding atoms, elements, and compounds and uses those concepts to develop students’ understanding as to how and why matter exists in three forms on Earth (solid, liquid, gas) and what causes matter to change from one form to another. The lesson cycle begins with students portraying particles and exploring how particles behave in the different states of matter. Then students learn how heat energy affects the interactions and behavior of these particles in the three states/phases. Students learn that particles are in constant motion and that this motion/movement changes with the addition of or removal of heat energy. Students model water particles and the interactions between water particles. Students create a project using photos from the modeling of water particles to demonstrate their understanding of the properties of matter and what causes phase changes in matter.
This lesson introduces or further develops the following science content vocabulary/terminology: atom, particle, matter, heat energy, condensation, evaporation, melting, freezing, water vapor, freezing point, boiling point, classify, compound, model, model limitations, physical property/change, solid, liquid, gas, phase change, states of matter, beaker, hot plate, thermometer.