Properties and Particle Motion of Solids, Liquids, and Gases
A compound is made of two or more different elements that are bonded together. A molecule can consist of the same or different elements. We use special names like to show these compounds. Sometimes, substances change due to things like rusting, which is a physical change that leads to new substances forming.
There are two main types of mixtures: homogeneous (which means everything is evenly mixed, like salt in water) and heterogeneous (where you can see the different parts, like vegetable soup).
Solids have their own shape and volume, and their particles are packed closely together but can vibrate a little. Liquids have a set volume but take the shape of whatever container they’re in, allowing particles to slide past each other. Gases don’t have a definite shape or volume, and their particles are far apart and move around freely.
Crystalline solids have a very neat arrangement of particles and melt at specific temperatures. In contrast, amorphous solids are less structured and change shape more gradually. Liquids have properties like surface tension (which affects how they interact with other things) and viscosity (how thick or thin they are and how easily they flow).
Temperature affects how fast particles move and their energy levels. When things heat up, the particles move faster, and changes in state can happen, like freezing, which occurs when substances cool down and lose energy.
This info gives a basic understanding of how different materials and their changes happen!