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Copy of Unit One Exam Study Guide

Unit One: Exam Study Guide
Elements and Compounds
Chemical Formula
Chemical Symbol
States of Matter
Physical Change
Chemical Change
****Be sure you know all of the Elements and Chemical Symbols we have covered
so far.
Hydrogen -H
Oxygen - O
Sodium - Na
Carbon - C
Chlorine - Cl
Nitrogen - N
Sulfur - S
Silicon - Si
Elements and Compounds
➢ Matter​ is anything that has mass and takes up space.
➢ Atoms​ make up elements and are the smallest most basic part of an
element. Each element consists of its own kind of atom, with its own
unique ​properties​.
➢ Properties ​of an element: An ​element​ is a ​pure substance​ and cannot
be broken down into simpler substances by a ​physical or chemical
➢ Elements ​are ​pure substances​ and every element known to man is
listed on the ​Periodic Table of Elements​.
➢ The ​Periodic Table of Elements​ lists all known pure substances that
exist in the world.
➢ Each ​element​ is represented by its own C
​ hemical Symbol​.
○ (H = Hydrogen)
➢ A ​Compound ​is two or more elements chemically bonding together to
form a new substance, a compound can be represented with a
chemical formula​ (H​2​O)
➢ A ​Mixture ​is a physical combination of 2 or more substances. Each
substance maintains its own identity.
➢ Know the arrangement of ​atoms​ that represent an ​element​.
➢ Know the arrangement of ​atoms ​that represent a ​compound.
➢ Know the arrangement of ​atoms ​that represent a ​Mixture​.
➢ Know how to tell the difference between an ​element​ and a c​ ompound
by identifying their ​Chemical Symbols​.
○ An element is represented by a single capital letter or a capital
letter followed by a lowercase letter (Na) or (H)
○ A compound is represented by two or more chemical symbols
placed together. (CO​2​) or (H​2​O)
○ Count the number of capital letters to determine the
number of elements present.
➢ Properties ​are characteristics or traits used to describe matter by
observation. (The banana is long, yellow and solid)
States of Matter
➢ 3​ states of matter​: Solid, Liquid and Gas.
➢ Know that with heating or cooling, the state of matter can be
○ As the temperature increases a solid can change to liquid
○ As the temperature is increases a liquid can change to a gas
○ As the temperature decreases a gas can change to a liquid
○ As the temperature decreases a liquid can change to a solid
Physical Change and Chemical Change
➢ When a ​Physical Change​ takes place, chemical makeup stays the
same. Look at the evidence involving a Physical Change
○ Size
○ Shape
○ State of Matter (solid, liquid, gas)
➢ When a ​Chemical Change​ takes place a new chemical ​substance​ is
formed. Look at the evidence involving a Chemical Change
○ Gas is produced
○ Temperature change
○ A precipitate is formed
○ Color change
➢ A ​precipitate ​is a solid that is formed during a ​chemical reaction
between two liquids.