Chemistry: States of Matter Unit Test Knowt

Solid

state of matter with tightly packed particles, definite shape & volume, not compressible, no flow

Liquid

state of matter with definite volume, no shape, flows, not compressible

Gas

state of matter with free particles, no shape or volume, compressible, flows

Pure Substance

matter with uniform, constant composition, cannot be physically separated

Mixture

two or more substances physically combined

Element

simplest form of matter, made of one type of atom

Compound

substance made of two or more elements chemically combined in a fixed ratio

Heterogeneous Mixture

mixture not uniform, different parts visible

Homogeneous Mixture

mixture uniform, looks the same throughout

Metal

shiny luster, ductile, malleable, solid at room temp, good conductor

Nonmetal

dull luster, brittle, poor conductor, can be solid/liquid/gas

Metalloid

has properties of both metals and nonmetals, semiconductor

Substance

matter with uniform and unchanging composition

Physical Property

observed without changing composition (ex: mass, boiling point)

Chemical Property

observed when substance changes composition (ex: reactivity, corrosive)

Intensive Property

does not depend on amount of matter (ex: density)

Extensive Property

depends on amount of matter (ex: volume, mass)

Vapor

gas form of a substance that is solid or liquid at room temperature

Physical Change

reversible change that does not alter composition

Chemical Change

irreversible change that alters composition

Precipitate

solid that forms from a solution during a chemical reaction

Law of Conservation of Mass

matter cannot be created or destroyed, only change form

What are the seven signs of a chemical change?

• change in temperature

• change in color

• change in odor

• change in taste

• formation of a precipitate (solid)

• production of light

• production of gas or bubbles