Review Matter-3

When you mix cornstarch and water, you get something that many science sites call Oobleck. Under pressure, it feels like a solid, but when the pressure is removed, it flows like a liquid. What state of matter is it?

Answer:

This is a mixture, made up of particles of solid matter surrounded by a liquid. The mixture is not a single state of matter.

This is an important concept to understand, and it is seen in many things we use every day. A good example is the Egg States video, showing how a mixture of liquid and gas can seem to be a solid.

Before you try to decide if something is solid, liquid, gas, plasma, or some other state of matter, first make sure that it is a pure substance, and not a mixture of different states.

Learn more about the science of cornstarch and water here.



Click to see which state standards this question tests, and which of my videos, experiments, and other resources support that topic.

Florida


SC.2.P.8.2 Identify objects and materials as solid, liquid, or gas.

SC.5.P.8.1 Compare and contrast the basic properties of solids, liquids, and gases, such as mass, volume, color, texture, and temperature.

>>> Teacher Page: States of Matter


SC.8.P.8.1 Explore the scientific theory of atoms (also known as atomic theory) by using models to explain the motion of particles in solids, liquids, and gases.

Utah


UT.5.I.2.a Identify the physical properties of matter (e.g., hard, soft, solid, liquid, gas).

NGSS