Chapter 15 Vocabulary Cards Flashcards
chemical change
A change of one substance to another is chemical change.
chemical property
A chemical property is a characteristic of a substance that indicates whether it can undergo a certain chemical change.
colloid
A colloid is a type of mixture with particles that are larger than those in solutions but not heavy enough to settle out.
compound
A compound is a substance in which the atoms of two or more elements are combined in a fixed proportion.
distillation
The process for separating substances in a mixture by evaporating a liquid and recondensing its vapor is distillation.
element
If all the atoms in a substance have the same identity, that substance is an element.
heterogeneous mixture
A mixture in which different materials can be distinguished easily is called a heterogeneous mixture.
homogeneous mixture
A homogeneous mixture contains two or more gaseous, liquid, or solid substances blended evenly throughout.
law of conservation of mass
According to the law of conservation of mass, the mass of all substances that are present before a chemical change equals the mass of all the substances that remain after the change.
physical change
A change in size, shape, or state of matter is called a physical change.
physical property
Any characteristic of material that you can observe without changing the identity of the substances that make up the material is a physical property.
solution
A solution is a homogeneous mixture of particles so small that they cannot be seen with a microscope that will never settle to the bottom of a container.
substance
A pure substance, or simply a substance, is a type of matter with a fixed composition.
suspension
Pond water is a suspension, which is a heterogeneous mixture containing a liquid in which visible particles settle.
Tyndall effect
This scattering of light by colloidal particles is called the Tyndall effect.
