The Temporary Mix: Suspension
The temporary mix: suspension teaches Grade 5 students about a type of mixture where insoluble particles float temporarily in a liquid without dissolving. When you shake sand and water, it looks mixed (cloudy) for a moment — but the sand is not dissolved, only temporarily suspended. Because the particles lack attraction to the water, they eventually settle as sediment at the bottom. A suspension is always unstable and will separate back into liquid and sediment over time. This concept is from Amplify Science (California) Grade 5, Chapter 2.
Key Concepts
If you shake a mixture of sand and water, it looks cloudy for a moment. The sand particles are floating around, but they are not dissolved.
This temporary mixture is called a suspension . It looks mixed for a short time, but because the particles are not attracted to the water, they will eventually settle out. A suspension is unstable; it will always separate back into liquid and sediment .
Common Questions
What is a suspension?
A suspension is a temporary mixture where insoluble particles are dispersed throughout a liquid but are not dissolved. The mixture looks mixed for a short time but will separate, with particles settling as sediment.
How is a suspension different from a solution?
In a solution, soluble particles dissolve completely and permanently. In a suspension, insoluble particles only temporarily float in the liquid and will eventually settle out.
What happens to a suspension over time?
The particles that are not attracted to the liquid will slowly settle to the bottom (or rise to the top) due to gravity. The mixture separates into a layer of liquid and a layer of sediment.
Why is a suspension unstable?
Because the particles are not attracted to the liquid molecules, there is no force holding them in solution. Gravity pulls them down (or up if less dense than liquid), so they always settle out eventually.
Give an example of a suspension in everyday life.
Shaking a bottle of Italian salad dressing creates a temporary suspension. The oil, vinegar, and herb particles mix when shaken but quickly separate into layers again when left still.
What grade and chapter covers suspensions?
Grade 5, Chapter 2 of Amplify Science (California): Why do some salad dressings have sediments, and others do not?