Do you know how to calculate density?
Particle Theory and Density Quiz
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Match the change of state with the transition using the words below.
Freezing, sublimation, evaporation or boiling, condensation, melting, deposition
- Gas to liquid =
- Liquid to solid =
- Solid to liquid =
- Liquid to gas =
- Solid to gas =
- Gas to solid =
Drag and drop to match the density with the state of matter
- Most dense state
- Least dense state
Fluids can flow. Which of the following are fluids?CorrectIncorrect
What are the melting and boiling points of water?
- Melting point
- Boiling point
Drag and drop
When a substance changes from a solid to a liquid, what happens to the mass?CorrectIncorrect
Which of the following is the correct equation for density?CorrectIncorrect
Which greek letter represents density?CorrectIncorrect
Drag and drop to match the description and state of matter. Particles are:
- Close together and move around each other
- Close together and vibrate around fixed positions
- Far apart and moving quickly in random directions
Using the equation ρ = m/V, calculate the density of a gold bar that has a mass of 25kg and a volume of 0.0013m³. Answer to 1 decimal place and give your answer in kg/m³.CorrectIncorrect
Find the volume of a silver block that has a mass of 159g and a density of 10.49 g/cm³. Give your answer in cm³ and to 1 decimal place.CorrectIncorrect
Which theory do we use to describe states of matter?CorrectIncorrect
What is Particle Theory (Kinetic Theory)?
Particle Theory is a set of assumptions about the microscopic (small scale) that we use to explain the macroscopic (large scale) phenomena that we experience. The assumptions allow us to develop explanations that are logically consistent with each other and are easy to understand.
These assumptions are that all matter is made of very small, hard, inelastic, spherical particles. These particles interact in predictable ways which allow us to develop models of the states of matter; solids, liquids and gases.
By using Particle Theory (also known as Kinetic Theory), we are able to not only understand the characteristics of different states of matter, but also the phase changes and why they happen when they do.
Another quite important benefit of using the Particle Theory of Matter to explain states of matter is that we are able to teach others and explain these concepts in simple language, making the knowledge accessible to most people.
The Particle Model of Atoms also allows us to talk about related topics and measures such as density and pressure, in the context of states of matter and energy.
Density is simply the ratio of matter to volume, with a substance that has more matter per unit volume being denser than a substance with less matter per unit volume.
We use the following equation to calculate density:
density = mass/volume
This equation can also be rearranged to get mass or volume given the other two measurements.
Given the equation for density, it is easy to understand that gases are the least dense of the three states of matter. Liquids are between gases and solids in terms of density, whilst solids have the highest density of the three states.
Particles in all three states of matter are constantly moving, since all objects that are hotter than absolute zero or 0 Kelvin have kinetic energy, meaning movement energy which is actually the same as temperature. Gases just have a greater amount of this energy than liquids or solids.
If you would like to find out more, check out our States of Matter Quiz and Explainer.