PS Ch 3 vocab with answers

Chapter 3

Name                                                                                                Period

Word

Picture/symbol

Definition

 

Matter

 

 

Anything that has matter and takes up space

 

Substance

 

 

A single kind of matter that is pure and has a specific set of properties

 

Chemical Property

 

 

A characteristic if a substance that describes its ability to change into different substances

 

Physical Property

 

 

A characteristic if a substance that can be observed without changing it into another substance

 

Element

 

 

 

A pure substance that cannot be broken down into other substances by chemical or physical means.

 

Atom

 

 

 

The basic particle from which all elements are made; the smallest particle of an element that has the properties if that element

 

Chemical Bond

 

 

The force of attraction that holds 2 atoms together

 

Molecule

 

 

A neutral group of two or more atoms held together by covalent bonds

 

Compound

 

 

 

A substance made of 2 or more elements chemically combined in a specific ratio, or proportion

 

Chemical Formula

 

 

Symbols that show the elements in a compound and the ratio of atoms

 

Mixture

 

 

 

2 or more substances that are together in the same place but their atoms are not chemically bonded

 

Physical Change

 

 

A change that alters the form or appearance of a material but does not make the material into another substance

 

Chemical Change

 

 

A change in which one or more substances combine or break apart to form new substances

 

Law of Conservation of Mass

 

The principle that the total amount of matter is neither created nor destroyed during any physical or chemical change

 

Temperature

 

 

 

How hot or cold something is; a measure of the average energy of motion of the particles of a substance; the measure of the avg. kinetic energy of the particles of a substance

 

Thermal Energy

 

 

 

The total kinetic and potential energy of all the particles of an object

 

Endothermic Change

 

 

A change in which energy is absorbed

 

Exothermic Change

 

 

A change in which energy is released

 

Chemical Energy

 

 

A form of potential energy that is stored in the chemical bonds between atoms