mass and takes up space.

individual substances are evenly mixed. In a homogeneous

mixture, the particles of individual substances are so small

and well mixed that you cannot see them, even under a microscope.

solution by mixing evenly.

Because the substances in a solution, or homogeneous

mixture, are evenly mixed, two samples from a solution will

have the same amounts of each substance.

dependent property of a given substance because its value

depends on the size of a sample.

can observe or measure without changing the identity

another. The drink powder is soluble in water, but sand is

not. The table below explains how physical properties such

as conductivity and solubility can be used to identify

objects and separate mixtures.

change is a change in size, shape, form, or state of matter in which the

matter’s identity stays the same. During a physical change, the

matter does not become something different even though

physical properties change.

of matter that can be observed as it changes to a different type of

matter. For example, can you tell by just looking at paper

that it will burn easily? The only way to know that paper

burns is to bring a flame near the paper and watch it burn.

change in matter in which the substances that make up the matter

change into other substances with new physical and chemical

properties. When iron undergoes a chemical change with

oxygen, rust forms. The substances that undergo a change

no longer have the same properties because they no longer

have the same identity.

concentration of the substance. A reaction occurs faster if the

concentration of at least one reactant increases.