In section 1.2, we learned about matter, mass, volume and states of matter as well. Matter can be anything that has a mass and volume. As long as it has physical properties, it will be matter. Mass is the amount of matter within the substance or object.
But what is a change of state? A change of state is when a substance will change from one form to another. In total, there are 6 changes of state. Sublimation, deposition, melting, solidification, evaporation and condensation. An example would be when a liquid turns into a gas. (Evaporation) the state of solids have definite shapes and volumes. Liquids have a definite volume, but the shape is formed by the container that it is in. The changes of state can be tricky to remember. Some are a bit simpler such as melting (Solid to liquid). If you think of examples for the changes they become a bit easier. When ice cream changes from its liquid form to solid form, it is called solidification. When puddles on the sidewalk disappear it is called evaporation. The toughest are most likely sublimation and deposition. The air deposes itself into a solid form (deposition) Solids become “sublime” when they float up and away into gas (sublimation). Finding the root of the word can make it easier.
The kinetic molecular theory is used to explain what changes occur to matter when the kinetic energy of particles change. This theory aids in describing especially what happens during changes of state. Kinetic energy has higher levels in hot objects. Cold objects have low levels of kinetic energy. The particles in cold objects merely move back and forth. Whereas the particles in hot objects move much faster.
In the bag of change lab, I learned about the chemical reactions that can occur when substances are mixed together. The three substances quickly became hot after being mixed together, showing that they now had higher levels of kinetic energy then when they were separated.