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Compounds: Glossary

A

atoms
the smallest particle of an element, the building blocks of matter

C

chemical bonds
forces by which atoms are bound together in a molecule or compound
Chemical changes
changes to the molecular composition of a substance
chemical reaction
reactions in which chemical bonds are formed or broken, and one or more substances change into entirely new substances with different properties
chemist
a scientist who studies chemistry
chemistry
the scientific study of matter: the structure, properties, and reactions of the elements and the compounds they form
components
parts or pieces that make up a larger whole
compound
a molecule made of atoms of different elements
Covalent bonds
chemical bonds in which electrons are shared between atoms

E

electrons
particles of an atom that are negatively charged and orbit the nucleus
elements
pure substance that contains only one type of atom
evaporated
turn from liquid into vapor

F

filter
a device through which a gas or liquid is passed to separate out solid matter
formulas
a shorthand recipe for a compound, using letters to represent elements and numbers to represent the number of atoms

I

Ionic bonds
chemical bonds in which electrons are donated or transferred between atoms

M

matter
anything that has mass and takes up space
mixture
a combination of two or more substances that are not chemically joined and can be physically separated
molecule
two or more atoms joined together by chemical bonds

N

neutrons
particles of an atom that have no charge and are located in the nucleus
nucleus
the collection of protons and neutrons in the center of an atom

O

orbit
to move or circle around another object

P

Periodic Table of Elements
a table that organizes the elements by their atomic number and chemical properties
Physical changes
a change to the size, shape, or state of a substance
properties
the distinctive color, temperature, feel, smell, taste or behavior of a substance
protons
particles of an atom that are positively charged and are located in the nucleus

S

state of matter
one of several states in which matter can exist, including solid, liquid, gas, and plasma
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