Changes of state are explained by a model of matter composed of atoms and/or molecules that are in motion.

“I Can…”

 explain that thermal energy is a measure of the motion of the atoms and molecules (kinetic energy) in a substance.

 describe the factors that affect thermal energy.

 investigate temperature change in order to infer changes in thermal energy.

 describe solids, liquids, and gases in terms of motion, spacing, and attractions between particles.

 model and explain how mass is conserved when substances undergo a change of state.

All matter is made up of small particles called atoms.

“I Can…”

 recognize that all matter is made up of atoms.

 explain that atoms take up space, have mass, and are in constant motion.

 create models of elements, compounds, and molecules to show atomic differences.

 describe the composition of substances in terms of elements and/or compounds.

 measure the mass and volume of a substance, and calculate density by dividing mass by the volume.

 compare substances by the amount of mass a substance has in a given amount of volume (density).

 construct and interpret mass vs. volume graphs.

 determine volume by using the water displacement test and calculate density.

Check out the video below for a demonstration of how liquids have different density.