Not much to say about these two really, that's why I put them together. Density is mass/volume, however, this topic is not easy as the questions they come up with in the tests are very tricky. As for the kinetic particular theory, it basically means that all matter are made up of atoms and are in continuous, random motion but the inter-molecular forces hold the atoms together. Also, these inter-molecular forces are strongest in the solid state, weaker in the liquid state and weakest in the gaseous state.
I like kinetic particle theory the most as it is the the easiest but density is especially hard for me. This is because it is a seemingly easy topic but I somehow cannot solve the questions in the test paper.
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